9TCS1085BNLG - IDT, Integrated Device Technology Inc

PRELIMINARY DATASHEET

MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR,

& PWM FAN CONTROLLER FOR PORTABLE DEVICES

9TCS1085

IDT®

MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR, & PWM FAN CONTROLLER FOR PORTABLE DEVICES 1

9TCS1085 REV 0.7 012012

Description

The 9TCS1085 is a highly programmable IC that integrates

clock synthesizers with a PWM Fan controller and

temperature sensor for hardware thermal protection.

The device has an ultra-low-power 32.768 kHz frequency

generator to support Real Time Clocks (RTC). This device

can generate the 32.768 kHz frequency up to four years of

life powered by a CR2032 coin cell battery. The 9TCS1085

can output computer system clock frequencies of 24, 25, 27

and 48 MHz which reduces the component count on the

circuit board.

The fan controller is pulsed width modulated (PWM) used

for the temperature proportional speed control. The device

is highly configurable through I2C for ease and flexibility of

use. The fan controller has three different modes of

operation and will work with multiple pole, brushless DC

fans. An integrated Start-up Timer ensures reliable motor

start-up and turn-on or follows a detected fault condition.

The 9TCS1085 includes temperature monitor function that

measures an external diode. The temperature sensor is

optimized to be accurate within ±1°C between the

temperature range of 60°C to 100°C. This device is highly

programmable through the use of I2C to set high and low

limits for the temperature sensor. The hardware limits drive

dedicated ALERT and THERM pins for system shutdown.

The 9TCS1085 is available in a 32-pin QFN package and is

available for commercial temperature range.

Applications

•Notebook Computers

•Netbook Computers

•Smartbook Computers

•Consumer Portable Devices

•Embedded Systems

•Networking Equipment (i.e. Routers, Switches)

•Network Area Storage

Features

Thermal Sensor

•One channel temperature sensor

•Both H/W & S/W programmable over/under temperature

alarms

•No Calibration required in application

•Diode failure detection

•Support SMBUS Alert

•Accuracy: ±1°C (+60°C to +100°C);

±2°C (0°C to + 100°C)

•Offset register for system calibration

•Series resistor cancellation feature

Fan Controller

•High frequency or low frequency PWM outputs for use

with 4-wire fans

•TACH inputs to measure fan speed

•OS independent automatic fan speed control based on

thermal information

•Dynamic TMIN control mode to optimize system

acoustics

•Default startup at 100% PWM for all fans for robust

operation

System Clock PLL Synthesizers

•Scalable low voltage VDD I/O (1.5V to 1.05V) to reduce

power consumption (applies to 25MHz output)

•Integrated series termination resistors

•Selectable – Single-ended 24MHz/27MHz/48MHz clock

output @ VDD3.3V

•3 – Single ended 25MHz clock outputs (buffer out)

•32.768 kHz outputs with < 1.8µA power consumption for

system RTC circuit

9TCS1085

MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR, & PWM FAN CONTROLLER FOR PORTABLE DEVICES

IDT®

MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR, & PWM FAN CONTROLLER FOR PORTABLE DEVICES 2

9TCS1085 REV 0.7 012012

Block Diagram

Preferred drive strengths for single-ended outputs.

Transmission lines to load do not share series resistors.

Desktop (Zo=50Ω) and mobile (Zo=55Ω) have the same drive strength.

1 Load Rs = 2 Loads Rs= 3 Loads Rs =

0.56 / 33

(17Ω)33Ω [39Ω] - -

20.92 / 66

(14Ω)39Ω [43Ω]22

Ω [27Ω]-

31.15 / 99

(

11.6Ω

)

43Ω [43Ω] 27Ω [33Ω]15

Ω [22Ω]

D.C.Drive Strength

Number of Loads

to Drive

Number of Loads Actually Driven.

Match Point for N

& P Voltage /

Current (mA)

VDD_RTC

V_bat

SMBCLK

Thermal Diode

V_3.3

Fan Controller

PWM

TACH

SMBDAT

ALERT#

THERM#

Analog

MUX

Sample

Current

Digital

11 bits

ADC

Regulator

RAM

Reference

Voltage Fault Detect

Power

Switch

POR

Xtal

GND

Amplitude

Control

32K_A

32K_B / 25M_C

VDD_32KB

25M_IO 25M_A

VDDIO_25MA

25M_IO 25M_B

VDD_25MB

Ultra

Low Power

PLL

24/48M_IO 24M_48M

VDD_24M

27/48M_IO 27M_48M

VDD_27M

VDD_TS

SMBUS

27Mhz_EN

32.768K

DCO 32K_A_IO

32K_B_IO

Fraction N

Divider

9TCS1085

MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR, & PWM FAN CONTROLLER FOR PORTABLE DEVICES

IDT®

MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR, & PWM FAN CONTROLLER FOR PORTABLE DEVICES 3

9TCS1085 REV 0.7 012012

Pin Assignment

Power Group

Thermal_DXP

Thermal_DXN

VBAT

VDD_32KB

SEL25*/32K_B_25M_C

GND

VDD_TS

GND_TS

32 31 30 29 28 27 26 25

EN_27_48* 124

THERM#

GND 223

ALERT#

32K_A 322

VDD_RTC_OUT

VDDIO_25MA 421

V_3.3

GND 520X2

25M_A 619X1

VDD_24M 718

SMBDATA

SEL_24*/24M_48M 817

SMBCLK

9 10111213141516

SEL_27*/27M_48

VDD_27M

25M_B

GND

VDD_25M

PWRGD/PD#

TACH

PWM

* Internal Pull-Up Resistor

24M/27M/48Mhz outputs require external series resistors on Board.

9TCS1085

VDD GND

4 2 VDDIO_25MA IO power

7 5 VDD_24M power

10 12 VDD_27M power

13 2 VDD_25B Power

21 2 V_3.3 core power

22 27 VDD_RTC_Out

26 25 VDD_TS power

29 27 VDD_32KB Power

30 27 V_bat for DCO and 32KA power

* pin33: thermal pad

Pin Number Description

9TCS1085

MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR, & PWM FAN CONTROLLER FOR PORTABLE DEVICES

IDT®

MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR, & PWM FAN CONTROLLER FOR PORTABLE DEVICES 4

9TCS1085 REV 0.7 012012

Pin Descriptions

PINPINNAME TYPE

DESCRIPTION

1 EN_27_48* PWR

Pin1027_48outputenable/disable.Realtime

2 GND OUT Groundpin

332K_A OUTRTCclock32.768KHzoutputA

4 VDDIO_25MA

PWR

Powerfor25MHz_Aoutput

5 GND PWR Groundpin

6 25M_A OUT 25MHz_AOutput

7VDD_24M

PWR

Powerfor24/48MHzoutput

24MhzEnableLatchedInput,programmableFreeRunning24/48Mclockoutput.

SEL_24Selectsthefunctionalityofthe24_48Moutputasfollows:

1=24Moutput(Default)

0=48Moutput

27MhzEnableLatchedInput,programmableFreeRunning27/48Mclockoutput.

SEL_27Selectsthefunctionalityofthe27_48Moutputasfollows:

1=27Moutput(default)

0=48Moutput

10 VDD_27M

PWR

Powerfor27/48MHzoutput

11 25M_B OUT 25MHz_BOutput

12 GND PWR Groundpin

13 VDD_25MBPWR PowerforLDOandmaincircuit

14 PWRGD/PD# IN This3.3VLVTTLinputnotifiesdevicetosamplelatchedinputsandstartuponfirsthighassertion,or

15 TACH IN FancontrollerTACHsignalinput

16 PWM OUT FancontrollerPWMsignaloutput

17 SMBCLK IN SMBUSclock

18 SMBDAT I/O SMBUSdata

19 X1 IN Crystalinput,Nominally25MHz.

20 X2 OUT Crystaloutput,Nominally25MHz

21 V_3.3 PWR Powerfor32KPLLcore,connecttosystem3.3V_StandBy

22 VDD_RTC_OUT OUT PowerforchipsetRTCcircuit

23 ALERT# OUT opendraininterruptoutputforSMBUSAlertpin

24 THERM# OUT opendraininterruptoutputforexternalhardwareconnection

25 GND_TS PWR Groundpinforthermalsensorfunction

26 VDD_TS PWR Powerforthermalsensorfunction

27 GND PWR Groundpin

25Mhz_Coutputselectpin,programmableFreeRunning32.768Khzor25Mhzclockoutput.

SEL_25*Selectsthefunctionalityofthe32K_25Moutputasfollows:

1=25Mhzoutput(Default)

0=32.768Khzoutput

29 VDD_32KB

PWR

Powerfor32.768Khz_Boutput

30 VBAT PWR Powerfor32kHz_Aoutput.Connecttocoincellbattery

31 Thermal_DXN1 IN externalthermaldiodeN

32 Thermal_DXP1 IN externalthermaldiodeP

33 ThermalPad PWR GND

SEL_27*/27M_48M I/O

SEL_24*/24M_48M

SEL_25*/32KB_25M_C

I/O

9TCS1085

MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR, & PWM FAN CONTROLLER FOR PORTABLE DEVICES

IDT®

MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR, & PWM FAN CONTROLLER FOR PORTABLE DEVICES 5

9TCS1085 REV 0.7 012012

Frequency and Output Selection Tables

Pin number Setting Output

L 48MHz

H 24MHz

L 48MHz

H 27MHz

L 32.768KHz_B

H 25MHz_C

default, internal pull high

Clock Output Selection Table

Remark

default, internal pull high

Output Selection Table A

V_Bat V_3.3 VDD_32KB VDDIO_25A VDD_25B 32K_A 32K_B 25M_A 25M_B VDD_RTC

2.3~3.00000ONOFFOFFOFFVbat

2.3~3.0 3.310 0 0 ON OFF OFF OFF V3.3

2.3~3.0 3.313.3 0 0 ON ON OFF OFF V3.3

2.3~3.0 3.313.3 1.05~1.520ONONONOFFV3.3

2.3~3.0 3.313.3 1.05~1.523.3 ON ON ON ON V3.3

Power Supply VDDIO_Control Outputs

Note 1: When V3.3 is applied, XTAL will always be ON. 32K source will switch to an analog PLL. Fan control will be ON.

Note 2: If amplitude greater than 1.5V is required on 25MHz_A output, please contact IDT support.

Output Selection Table B

V_3.3 VDD_24M1VDD_27M VDD_TS 24_48M 27_48M Fan Control Thermal

Sensor

3.3 0 0 0 OFF OFF ON OFF

3.3 3.3 0 0 ON OFF ON OFF

3.3 3.3 3.3 0 ON ON ON OFF

3.3 3.3 3.3 3.3 ON ON ON ON

Note 1: When either VDD_24M, VDD_27M or VDD_TS is ON, V_3.3 should be ON.

OutputsPower Supply

9TCS1085

MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR, & PWM FAN CONTROLLER FOR PORTABLE DEVICES

IDT®

MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR, & PWM FAN CONTROLLER FOR PORTABLE DEVICES 6

9TCS1085 REV 0.7 012012

Absolute Maximum Ratings

Stresses above the ratings listed below can cause permanent damage to the 9TCS1085. These ratings, which are standard

values for IDT commercially rated parts, are stress ratings only. Functional operation of the device at these or any other

conditions above those indicated in the operational sections of the specifications is not implied. Exposure to absolute

maximum rating conditions for extended periods can affect product reliability. Electrical parameters are guaranteed only over

the recommended operating temperature range.

Electrical Characteristics–SMBus Interface

AC Electrical Characteristics–Input/Common Parameters

PARAMETER SYMBOL CONDITIONS MIN MAX UNITS Notes

Maximum Supply Voltage VDDxxx Core/Logic Supply 3.6 V 1,2

Maximum Supply Voltage VDDIOxxx Core/Logic Supply 3.6 V 1,2

Maximum Input Voltage VIH 3.3V LVCMOS Inputs 3.6 V 1,2,3

Minimum Input Voltage VIL Any Input GND - 0.5 V 1,2

Storage Temperature Ts - -65 150 °C1,2

Case Temperature Tcase

115 °C 1,2

Unless otherwise noted,

uaranteed by desi

n and characterization, not 100% tested in production.

2 Operation under these conditions is neither implied, nor guaranteed.

3 Maximum input voltage is not to exceed maximum VDD

PARAMETER SYMBOL CONDITIONS MIN MAX UNITS Notes

SMBus Voltage V

2.7 3.6 V 1

Low-level Output Voltage VOLSMB @ IPULLUP 0.4 V 1

Current sinking at

VOLSMB = 0.4 V IPULLUP SMB Data Pin 4 mA 1

SCLK/SDATA

Clock/Data Rise Time TRI2C

(Max VIL - 0.15) to

(Min VIH + 0.15) 1000 ns 1

SCLK/SDATA

Clock/Data Fall Time TFI2C

(Min VIH + 0.15) to

(Max VIL - 0.15) 300 ns 1

Maximum SMBus Operating

Frequency FSMBUS Block Mode 400 kHz 1

1 Unless otherwise noted, guaranteed by design and characterization, not 100% tested in production.

PARAMETER SYMBOL CONDITIONS MIN MAX UNITS Notes

Clk Stabilization TSTAB

From VDD Power-Up or de-

assertion of PD# to 1st clock 1.8 ms 1

Tdrive_PD# TDRPD

Differential output enable after

PD# de-assertion 300 us 1

1 Unless otherwise noted, guaranteed by design and characterization, not 100% tested in production.

9TCS1085

MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR, & PWM FAN CONTROLLER FOR PORTABLE DEVICES

IDT®

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9TCS1085 REV 0.7 012012

Electrical Characteristics–Input/Supply/Common Parameters

PARAMETER SYMBOL CONDITIONS MIN MAX UNITS Notes

Ambient Operating Temp Tambient - 0 70 °C

Supply Voltage V_3.3 Supply Voltage 3.135 3.465 V

Supply Voltage VDD_xx Other Supply Voltages 3.135 3.465 V

Supply Voltage VDDIO_25MA Supply Voltage 0.9975 1.575 V

Supply Voltage V_bat Supply Voltage 2.3 3.465 V

Input High Voltage V

IHSE

Single-ended inputs 2 V

+ 0.3 V 1,4

Input Low Voltage VILSE Single-ended inputs VSS - 0.3 0.8 V 1,4

Low Threshold Input-

High Voltage VIH_FS 3.3 V +/-5% 0.7 VDD + 0.3 V 1

Low Threshold Input-

Low Voltage VIL_FS 3.3 V +/-5% VSS - 0.3 0.35 V 1

Input Leakage Current I

= V

DD ,

=GND -5 5 uA 1,3

Input Leakage Current IINRES

Inputs with pull or pull down

resistors

VIN = VDD , VIN = GND

-200 200 uA 1

Output High Voltage VOHSE

Single-ended outputs, IOH = -

1mA 2.4 V 1,2

Output Low Voltage V

OLSE

Single-ended outputs, I

= 1 mA 0.4 V 1,2

IDD3.3OP

Full active mode, CL = Full load,

3.3V Rail

50 mA 1

IDD3.3PD# Complete Power-Down, 3.3V Rail 10 mA 1

IDD3.3WOL

WOL Mode with 25MA running,

3.3V Rail

25 mA 1

IDD3.3RTC

RTC Mode with 32KA running,

3.3V Rail

0.1 uA 1

IDDIO_OP

Full active mode, CL = Full load,

VDDIO Rails

5mA1

IDDIO_PD#

Complete Power-Down,

VDDIO Rails

1mA1

IDDDIO_WOL

WOL Mode with 25MA running,

VDDIO Rails

10 mA 1

IDDIO_RTC

RTC Mode with only 32KA

running, VDDIO Rails

0.5 uA 1

V_bat Operating Supply

Current

IDD_V_bat RTC Mode with 32KA running,

V_bat Rail

1.8 uA 1

Input Frequency FiVDD = 3.3 V MHz 1

Pin Inductance L

7nH1

CIN Logic Inputs 1.5 5 pF 1

OUT

Output pin capacitance 6 pF 1

CINX X1 & X2 pins 6 pF 1

*TA = 0 - 70°C; Supply Voltage V_3.3 = VDD_TS = 3.3 V +/-5%, VDD_24M = VDD_27M = VDD_25MB = 3.3V +/- 5%,

VDD_25MA = 1.05V +/- 5%, VDD_32KB = 3.3V +/- 5%, CL = 5pF with Rs = 27Ω (unless otherwise specified)

Input Capacitance

3.3V Operating Supply

Current

VDDIO Operating Supply

Current

25MHz Typical

1 Unless otherwise noted, guaranteed by design and characterization, not 100% tested in production.

2Signal is required to be monotonic in this region.

3 Input leakage current does not include inputs with pull-up or pull-down resistors

4 3.3V referenced inputs are: SCLK, SDATA, SEL_25, SEL_24, SEL_27, PWRGD.

9TCS1085

MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR, & PWM FAN CONTROLLER FOR PORTABLE DEVICES

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9TCS1085 REV 0.7 012012

AC Electrical Characteristics–Power Management

Power Switch (VBAT/V33 -> VDD_RTC)

Integrated power switch detects the VDD_RTC SW to coin cell battery (VBAT) or main power supply (V33).

When there is no V33 (V33=0), the SW will connect the VDD_RTC to VBAT; when V33 goes higher than 2.5V, the VDD_RTC

will be switched to V33 with no delay. After V33 goes lower than 2.3V, the VDD_RTC will be switched to VBAT, no delay.

When VDD_RTC = VBAT, the power SW circuit consumes < 100nA.

When VDD_RTC = V33, the power consumption on VBAT needs to be “0”.

Output Clock Power Consumption Table

V_bat / V_3.3 I_V_bat I_V_3.3 I_VDD_32KB I_VDD_25M

2.3~3.3 1.8uA 0 0 0

2.3~3.3 0 2mA 0 0

2.3~3.3 0 2mA 1uA 0

2.3~3.3 0 2mA 1uA 1mA

2.3~3.3 0 2mA 1uA 2mA

V_3.3 I_V3.3 I_VDD_24M I_VDD_27M I_VDD_TS

3.3 2mA 0 0 0

3.3 2mA 3mA 0 0

3.3 2mA 3mA 1mA 0

3.3 2mA 3mA 1mA 0.8mA

Note: When V_3.3 is applied, XTAL will always be ON. 32K source will switch to an analog PLL.

Power Supply

Power consumption @ 2' transmission line

VDD_24/27/TS

Note: When either VDD_24M, VDD_27M or VDD_TS is ON, V3.3 should be ON

Outputs

Power Consumption @ 2' transmission line

32K_A

24/27Mhz+Thermal+Fan

24/27Mhz

24Mhz

Power Supply

32K_A+B,25MA+B

32K_A+B

32K, 25M_A

V_bat 3.0V

V3.3 > 2.5V

V3.3 < 2.3V

VDD_RTC=V3.3 VDD_RTC=Vbat

VDD_RTC

9TCS1085

MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR, & PWM FAN CONTROLLER FOR PORTABLE DEVICES

IDT®

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9TCS1085 REV 0.7 012012

Electrical Characteristics–USB48MHz

Electrical Characteristics–24MHz

PARAMETER SYMBOL CONDITIONS MIN MAX UNITS NOTES

Lon

Accuracy ppm see Tperiod min-max values -100 100 ppm 1,2

Clock period Tperiod 48.00MHz output nominal 20.8313 20.8354 ns 1,2

Output High Voltage V

= -1 mA 2.4 V 1

Output Low Voltage VOL IOL = 1 mA 0.4 V 1

@MIN = 1.0 V -33 mA 1

VOH@MAX = 3.135 V -33 mA 1

@ MIN = 1.95 V 30 mA 1

VOL @ MAX = 0.4 V 38 mA 1

Rising Edge Slew Rate t

SLR

Measured from 0.8 to 2.0 V 0.5 2.5 V/ns 1

Falling Edge Slew Rate tSLR Measured from 2.0 to 0.8 V 0.5 2.5 V/ns 1

Duty Cycle d

= 1.5 V 45 55 % 1

Jitter, Cycle to cycle tjcyc-cyc VT = 1.5 V 350 ps 1

*TA = 0 - 70°C; Supply Voltage V_3.3 = VDD_TS = 3.3 V +/-5%, VDD_24M = VDD_27M = VDD_25MB = 3.3V +/- 5%,

VDD_25MA = 1.05V +/- 5%, VDD_32KB = 3.3V +/- 5%, CL = 5pF with Rs = 27Ω (unless otherwise specified)

1Guaranteed by design and characterization, not 100% tested in production.

2 All Long Term Accuracy and Clock Period specifications are guaranteed assuming that REFOUT is at 25.000000MHz

Output High Current IOH

Output Low Current IOL

PARAMETER SYMBOL CONDITIONS MIN MAX UNITS NOTES

Lon

Accuracy ppm see Tperiod min-max values -100 100 ppm 1,2

Clock period Tperiod 24.00MHz output nominal 41.6625 41.6708 ns 1,2

Output High Voltage V

= -1 mA 2.4 V 1

Output Low Voltage VOL IOL = 1 mA 0.4 V 1

@MIN = 1.0 V -33 mA 1

VOH@MAX = 3.135 V -33 mA 1

@ MIN = 1.95 V 30 mA 1

VOL @ MAX = 0.4 V 38 mA 1

Rising Edge Slew Rate t

SLR

Measured from 0.8 to 2.0 V 0.5 4 V/ns 1

Falling Edge Slew Rate tSLR Measured from 2.0 to 0.8 V 0.5 4 V/ns 1

Duty Cycle d

= 1.5 V 45 55 % 1

Jitter, Cycle to cycle tjcyc-cyc VT = 1.5 V 350 ps 1

*TA = 0 - 70°C; Supply Voltage V_3.3 = VDD_TS = 3.3 V +/-5%, VDD_24M = VDD_27M = VDD_25MB = 3.3V +/- 5%,

VDD_25MA = 1.05V +/- 5%, VDD_32KB = 3.3V +/- 5%, CL = 5pF with Rs = 27Ω (unless otherwise specified)

1Guaranteed by design and characterization, not 100% tested in production.

2 All Long Term Accuracy and Clock Period specifications are guaranteed assuming that REFOUT is at 25.000000MHz

Output High Current IOH

Output Low Current IOL

9TCS1085

MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR, & PWM FAN CONTROLLER FOR PORTABLE DEVICES

IDT®

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9TCS1085 REV 0.7 012012

Electrical Characteristics–25MHz

Electrical Characteristics–27MHz

PARAMETER SYMBOL CONDITIONS MIN MAX UNITS

NOTES

Long Accuracy ppm see Tperiod min-max values -100 100 ppm 1,2

Clock period Tperiod 25.00MHz output nominal 39.99600 40.00400 ns 1,2

Output High Voltage VOH IOH = -1 mA 2.4 V 1

Output Low Voltage VOL IOL = 1 mA 0.4 V 1

V OH @MIN = 1.0 V -29 mA 1

VOH@MAX = 3.135 V -23 mA 1

VOL @ MIN = 1.95 V 29 mA 1

VOL @ MAX = 0.4 V 27 mA 1

Rising Edge Slew Rate tSLR Measured from 0.8 to 2.0 V 0.5 4 V/ns 1

Falling Edge Slew Rate tSLR Measured from 2.0 to 0.8 V 0.5 4 V/ns 1

Duty Cycle dt1 VT = 1.5 V 40 60 % 1

Jitter, Cycle to cycle tjcyc-cyc VT = 1.5 V 500 ps 1

*TA = 0 - 70°C; Supply Voltage V_3.3 = VDD_TS = 3.3 V +/-5%, VDD_24M = VDD_27M = VDD_25MB = 3.3V +/- 5%,

VDD_25MA = 1.05V +/- 5%, VDD_32KB = 3.3V +/- 5%, CL = 5pF with Rs =0Ω (unless otherwise specified)

1Guaranteed by design and characterization, not 100% tested in production.

2 All Long Term Accuracy and Clock Period specifications are guaranteed assuming that REFOUT is at 25.000000MHz

Output High Current IOH

Output Low Current IOL

Long Accuracy ppm see Tperiod min-max values -50 50 ppm 1,2

Clock period Tperiod 27.000MHz output nominal 37.0365 37.0376 ns 1,2

Output High Voltage VOH IOH = -1 mA 2.4 V 1

Output Low Voltage VOL IOL = 1 mA 0.4 V 1

V OH @MIN = 1.0 V -29 mA 1

VOH@MAX = 3.135 V -23 mA 1

VOL @ MIN = 1.95 V 29 mA 1

VOL @ MAX = 0.4 V 27 mA 1

Rising Edge Slew Rate tSLR Measured from 0.8 to 2.0 V 1 4 V/ns 1

Falling Edge Slew Rate tFLR Measured from 2.0 to 0.8 V 1 4 V/ns 1

Duty Cycle dt1 VT = 1.5 V 45 55 % 1

Jitter, Cycle to cycle tjcyc-cyc Cycle to Cycle, VT = 1.5 V 200 ps 1

*TA = 0 - 70°C; Supply Voltage V_3.3 = VDD_TS = 3.3 V +/-5%, VDD_24M = VDD_27M = VDD_25MB = 3.3V +/- 5%,

VDD_25MA = 1.05V +/- 5%, VDD_32KB = 3.3V +/- 5%, CL = 5pF with Rs = 27Ω (unless otherwise specified)

1Guaranteed by design and characterization, not 100% tested in production.

2 All Long Term Accuracy and Clock Period specifications are guaranteed assuming that REFOUT is at 25.000000MHz

Output Low Current IOL

Output High Current IOH

9TCS1085

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9TCS1085 REV 0.7 012012

Electrical Characteristics–32KHz_A (Low Voltage Output)

Electrical Characteristics–32KHz_B

Recommended 25MHz Crystal Specification

PARAMETER SYMBOL CONDITIONS MIN MAX UNITS Notes

Long Accuracy ppm see Tperiod min-max values kHz 1,2

Output High Voltage VOH 32K_A Output 0.8 1.2 V 1

Output Low Voltage VOL 32K_A Output 0.3 V 1

+/-10 ppm

0.86 sec/day 1

RTC Frequency Error 32KRTC_7D 7-day measurement 8 sec 1

Rising Edge Slew Rate tSLR Measured from 20% to 80% V/ns 1

Falling Edge Slew Rate tFLR Measured from 80% to 20% V/ns 1

Duty Cycle dt1 VT = V_bat/2 40 60 % 1

*TA = 0 - 70°C; Supply Voltage V_3.3 = VDD_TS = 3.3 V +/-5%, VDD_24M = VDD_27M = VDD_25MB = 3.3V +/- 5%,

VDD_25MA = 1.05V +/- 5%, VDD_32KB = 3.3V +/- 5%, CL = 2pF with Rs = 0Ω (unless otherwise specified)

1Guaranteed by design and characterization, not 100% tested in production.

2 All Long Term Accuracy and Clock Period specifications are guaranteed assuming that REFOUT is at 25.000000MHz

32.768 Typical

Initial Frequency Error 32KINI 0C to 70C

0.03 typ

PARAMETER SYMBOL CONDITIONS MIN MAX UNITS Notes

Lon

Accuracy ppm see Tperiod min-max values kHz 1,2

Output High Voltage VOH 32K_B Output 0.9975 3.465 V 1

Output Low Voltage V

32K_B Output 0.3 V 1

+/-10 ppm 1

0.86 sec/day

Rising Edge Slew Rate tSLR Measured from 20% to 80% 0.3 2 V/ns 1

Falling Edge Slew Rate t

FLR

Measured from 80% to 20% 0.3 2 V/ns 1

Duty Cycle dt1 VT = V_bat/2 40 60 % 1

*TA = 0 - 70°C; Supply Voltage V_3.3 = VDD_TS = 3.3 V +/-5%, VDD_24M = VDD_27M = VDD_25MB = 3.3V +/- 5%,

VDD_25MA = 1.05V +/- 5%, VDD_32KB = 3.3V +/- 5%, CL = 2pF with Rs = 0Ω (unless otherwise specified)

1Guaranteed by design and characterization, not 100% tested in production.

2 All Long Term Accuracy and Clock Period specifications are guaranteed assuming that REFOUT is at 25.000000MHz

32.768 Typical

Initial Frequency Error 32KINI 0C to 70C

PARAMETER SYMBOL CONDITIONS MIN MAX UNITS NOTES

Frequency Accuracy Faccur @25C +/-10 ppm 1

Frequency Error over

temperature Ferrt -10C ~ 70C +/-10 ppm 1

Frequency Aging Faging 1 year +/-1 ppm 1

Driver Level DL 100 uW 1

Crystal Load Capacitance CL Parallel Resonance pF 1

*TA = 0 - 70°C; Supply Voltage V_3.3 = VDD_TS = 3.3 V +/-5%, VDD_24M = VDD_27M = VDD_25MB = 3.3V +/- 5%,

VDD_25MA = 1.05V +/- 5%, VDD_32KB = 3.3V +/- 5% (unless otherwise specified)

1Guaranteed by design and characterization, not 100% tested in production.

8pF Typical

9TCS1085

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9TCS1085 REV 0.7 012012

Electrical Characteristics–Thermal Sensor Controller

Electrical Characteristics–Fan Controller

PARAMETER SYMBOL CONDITIONS MIN MAX UNITS Notes

0C<TA<60C 2 C 1

60C<TA<100C 1 C 1

Resolution 1C1

0C<TA<60C 2 C 1

60C<TA<100C 1 C 1

Resolution Rs 1 C 1

Conversion Rate CR 16 1/64 Sec 1

*TA = 0 - 70°C; Supply Voltage V_3.3 = VDD_TS = 3.3 V +/-5%, VDD_24M = VDD_27M = VDD_25MB = 3.3V +/- 5%,

VDD_25MA = 1.05V +/- 5%, VDD_32KB = 3.3V +/- 5% (unless otherwise specified)

1Guaranteed by design and characterization, not 100% tested in production.

Local Sensor Accuracy

Remote Sensor Accuracy Raccu

PARAMETER SYMBOL CONDITIONS MIN MAX UNITS Notes

PWM frequency PWM 25 27 kHz 1

PWM Duty Cycle DUTY 100 % 1

Tachometer Ran

eTACH 14POLE1

*TA = 0 - 70°C; Supply Voltage V_3.3 = VDD_TS = 3.3 V +/-5%, VDD_24M = VDD_27M = VDD_25MB = 3.3V +/- 5%,

VDD_25MA = 1.05V +/- 5%, VDD_32KB = 3.3V +/- 5% (unless otherwise specified)

Guaranteed by desi

n and characterization, not 100% tested in production.

9TCS1085

MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR, & PWM FAN CONTROLLER FOR PORTABLE DEVICES

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9TCS1085 REV 0.7 012012

General SMBus Serial Interface Information for 9TCS1085

How to Write

•Controller (host) sends a start bit

•Controller (host) sends the write address

•IDT clock will acknowledge

•Controller (host) sends the beginning byte location = N

•IDT clock will acknowledge

•Controller (host) sends the byte count = X

•IDT clock will acknowledge

•Controller (host) starts sending Byte N through Byte

N+X-1

•IDT clock will acknowledge each byte one at a time

•Controller (host) sends a Stop bit

How to Read

•Controller (host) will send a start bit

•Controller (host) sends the write address

•IDT clock will acknowledge

•Controller (host) sends the beginning byte location = N

•IDT clock will acknowledge

•Controller (host) will send a separate start bit

•Controller (host) sends the read address

•IDT clock will acknowledge

•IDT clock will send the data byte count = X

•IDT clock sends Byte N+X-1

•IDT clock sends Byte 0 through Byte X (if X(H) was

written to Byte 8)

•Controller (host) will need to acknowledge each byte

•Controller (host) will send a not acknowledge bit

•Controller (host) will send a stop bit

Index Block Write Operation

Controller (Host) IDT (Slave/Receiver)

TstarT bit

Slave Address

WR WRite

ACK

Beginning Byte = N

ACK

Data Byte Count = X

ACK

Beginning Byte N

X Byte

ACK

Byte N + X - 1

ACK

PstoP bit

Read Address Write Address

D3H) D2(H)

Index Block Read Operation

Controller (Host) IDT (Slave/Receiver)

TstarT bit

Slave Address

WR WRite

ACK

Beginning Byte = N

ACK

RT Repeat starT

Slave Address

RD ReaD

ACK

Data Byte Count=X

ACK

X Byte

Beginning Byte N

ACK

Byte N + X - 1

N Not acknowledge

PstoP bit

9TCS1085

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9TCS1085 REV 0.7 012012

Byte0 Name Control Function Type 0 1 PWD

Bit7 SIGN 0

Bit6 64C 1

Bit5 32C 1

Bit4 16C 1

Bit3 8C 1

Bit2 4C 1

Bit1 2C 1

Bit0 1C 1

Note: Register readback uses 2's Complement

Byte1 Name Control Function Type 0 1 PWD

Bit7 -0

Bit6 -1

Bit5 -1

Bit4 -1

Bit3 -1

Bit2 -1

Bit1 -1

Bit0 -1

Note: Register readback uses 2's Complement

Byte 2 Reserved Register

Byte3 Name Control Function Type 0 1 PWD

Bit7 SIGN 1

Bit6 64C 0

Bit5 32C 0

Bit4 16C 0

Bit3 8C 0

Bit2 4C 0

Bit1 2C 0

Bit0 1C 1

Note: Register readback uses 2's Complement

Byte 4~5 Reserved Register

Byte6 Name Control Function Type 0 1 PWD

Bit7 CH1_EN Enable Temp-Sensor Channel1 RW Disable Enable 0

Bit6 Reserved Reserved RW - - 0

Bit5 Reserved Reserved RW - - 1

Bit4 Reserved Reserved RW - - 0

Bit3 RW 00 = 1 01 = 2 0

Bit2 RW 10 = 3 11 = 4 0

Bit1 RW 00 = 1 01 = 4 0

Bit0 RW 10 = 8 11 = 16 0

ALERT_TL1 CH1 Diode ALERT Low Temperature

Limit RW -

ALERT_TH1 CH1 Diode ALERT High Temperature

Limit RW -

Reserved Reserved RW -

Consecutive ALERT Consecutive ALERT Report

Average_Fact Average the converted temperature

9TCS1085

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9TCS1085 REV 0.7 012012

Byte7 Name Control Function Type 0 1 PWD

Bit7 Reserved 0

Bit6 64C 1

Bit5 32C 1

Bit4 16C 1

Bit3 8C 1

Bit2 4C 1

Bit1 2C 1

Bit0 1C 1

Byte 8~9 Reserved Register

Byte10 Name Control Function Type 0 1 PWD

Bit7 RW 1.28C 1

Bit6 RW 0.64C 0

Bit5 RW 0.32C 0

Bit4 RW 0.16C 0

Bit3 RW 4C 1

Bit2 RW 2C 0

Bit1 RW 1C 0

Bit0 RW 0.5C 0

Byte 11 Reserved Register

Byte12 Name Control Function Type 0 1 PWD

Bit7 Reserved Reserved RW - - 0

Bit6 Reserved Reserved RW - - 0

Bit5 MASK1 MASK Channel1 ALERT RW Non-Mask Mask 0

Bit4 RW 16C 0

Bit3 RW 8C 0

Bit2 RW 4C 1

Bit1 RW 2C 0

Bit0 RW 1C 0

Byte13 Name Control Function Type 0 1 PWD

Bit7 Reserved Reserved R - - 0

Bit6 Reserved Reserved R - - 0

Bit5 Reserved Reserved R - - 0

Bit4 Reserved Reserved R - - 0

Bit3 CH1 High Channel 1 ALERT High Alarm R Non-Flag Flag 0

Bit2 CH1 Low Channel 1 ALERT Low Alarm R Non-Flag Flag 0

Bit1 CH1 Fault Channel 1 Diode Fault (Open) R Non-Flag Flag 0

Bit0 Reserved Reserved R - - 0

D_A1 CH1 Gain (Slope) Coefficient

D_B1 CH1 Offset Coefficient

THERMAL1 CH1 Diode THERMALTemperature Limit RW -

THERMAL_HYS THERMAL Limit Hysteresis -

9TCS1085

MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR, & PWM FAN CONTROLLER FOR PORTABLE DEVICES

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9TCS1085 REV 0.7 012012

Byte14 Name Control Function Type 0 1 PWD

Bit7 BUSY ADC is converting R Non-Flag Flag 0

Bit6 HIGH One of the Channels ALERT High R Non-Flag Flag 0

Bit5 LOW One of the Channels ALERT Low R Non-Flag Flag 0

Bit4 FAULT One of the EXT-Channel Open/Short R Non-Flag Flag 0

Bit3 Reserved Reserved R - - 0

Bit2 CH1_THERMAL Channel1 THERMAL Alarm R Non-Flag Flag 0

Bit1 Reserved Reserved R - - 0

Bit0 Reserved Reserved R - - 0

Byte15 Name Control Function Type 0 1 PWD

Bit7 Fault_Clear Clear all the Alarm Flag RW No Clear Clear 0

Bit6 One-Shot One-Shot Temperature Conversion RW Disable Oneshot Do OneShot 0

Bit5 DYN_AVE_EN Enable Dynamic average RW Disable Dynamic Average Enable Dynamic Average 0

Bit4 Conv. Rate 3 RW 0

Bit3 Conv. Rate 2 RW 0

Bit2 Conv. Rate 1 RW 1

Bit1 Conv. Rate 0 RW 0

Bit0 Reserved Reserved RW - - 0

Byte16 Name Control Function Type 0 1 PWD

Bit7 RSIGN0

Bit6 R640

Bit5 R320

Bit4 R160

Bit3 R80

Bit2 R40

Bit1 R20

Bit0 R10

Byte17 Name Control Function Type 0 1 PWD

Bit7 Reserved Reserved R - - 0

Bit6 Reserved Reserved R - - 0

Bit5 Reserved Reserved R - - 0

Bit4 Reserved Reserved R - - 0

Bit3 Reserved Reserved R - - 0

Bit2 R0.50

Bit1 R0.250

Bit0 R 0.125 0

Byte 18~21 Reserved Register

Byte22 Name Control Function Type 0 1 PWD

Bit7 R 128 0

Bit6 R640

Bit5 R320

Bit4 R160

Bit3 R80

Bit2 R40

Bit1 R20

Bit0 R10

TEMP <10:3> MSB of Temperature -

TEMP<2:0> LSB of Temperature -

See Detail From Convert Ratio Table

TACH_MEASURE<7:0> LSB of TACH Measurement -

9TCS1085

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9TCS1085 REV 0.7 012012

Byte23 Name Control Function Type 0 1 PWD

Bit7 Reserved Reserved R - - 0

Bit6 Reserved Reserved R - - 0

Bit5 Reserved Reserved R - - 0

Bit4 R 4096 0

Bit3 R 2048 0

Bit2 R 1024 0

Bit1 R 512 0

Bit0 R 256 0

Byte24 Name Control Function Type 0 1 PWD

Bit7 RW 00 - Direct Drive Mode 01 - Thermal Trigger Mode 1

Bit6 RW 10 - Dynamic PWM Mode 11 - Reserved 0

Bit5 RW 00 - 25KHz 01 - 22KHz 0

Bit4 RW 10 - 27KHz 11 - Reserved 0

Bit3 RW 00 - 1Pole FAN 01 - 2 Poles FAN 0

Bit2 RW 10 - 3 Poles FAN 11 - 4 Poles FAN 1

Bit1 RW 00 - 0 01 - 32 0

Bit0 RW 10 - 64 11 - 128 1

Byte25 Name Control Function Type 0 1 PWD

Bit7 RW 00 - 250ms 01 - 500ms 0

Bit6 RW 10 - 1s 11 - 2s 1

Bit5 RW 1

Bit4 RW 1

Bit3 RW 0

Bit2 RW 00 - 3 01 - 4 0

Bit1 RW 10 - 5 11 - 6 1

Bit0 Reserved Reserved RW - - 0

Byte26 Name Control Function Type 0 1 PWD

Bit7 RW 1 0

Bit6 RW 1/2 0

Bit5 RW 1/4 0

Bit4 RW 1/8 0

Bit3 RW 1/16 0

Bit2 RW 1/32 0

Bit1 RW 1/64 0

Bit0 RW 1/128 0

Byte27 Name Control Function Type 0 1 PWD

Bit7 RW 1/256 0

Bit6 RW 1/512 0

Bit5 RW 1/1024 0

Bit4 RW 0

Bit3 RW 1

Bit2 RW 1

Bit1 RW 00 - 2C 01 - 5C 0

Bit0 RW 10 - 10C 11 - 15C 1

TACH_MEASURE<12:8> MSB of TACH Measurement -

Mode Select Select the FAN Operating Mode

Freq_Sel Select the PWM frequency

Edge FAN Type Selection

Error Range TACH Detect Tolerant Error Rang

Spin-Up Time The Time For Spin-Up

Spin-Up Duty PWM Duty-Cycle For Spin-Up

000 - 30%, 001 - 35%, 010 - 40%,

011 - 45%, 100 - 50%, 101 - 55%,

110 - 60%, 111 - 65%

Spin-Up cnt Time Out Times For Spin-Up

Duty_Cycle<10:3> MSB of PWM Duty-Cycle Setting -

Duty_Cycle<2:0> LSB of PWM Duty-Cycle Setting -

Update Time TACH Detect Update Time 000 - 100ms, 001 - 200ms, 010 - 300ms, 011 - 400m,

100 - 500ms, 101 - 600ms, 110 - 700ms, 111 - 800ms

T_Hy s Temperature Hysteresis For FAN's

Trigger Point

9TCS1085

MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR, & PWM FAN CONTROLLER FOR PORTABLE DEVICES

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9TCS1085 REV 0.7 012012

Byte28 Name Control Function Type 0 1 PWD

Bit7 RW Reserved 0

Bit6 RW 64C 1

Bit5 RW 32C 1

Bit4 RW 16C 1

Bit3 RW 8C 1

Bit2 RW 4C 1

Bit1 RW 2C 1

Bit0 RW 1C 1

Byte29 Name Control Function Type 0 1 PWD

Bit7 RW Reserved 0

Bit6 RW 64C 1

Bit5 RW 32C 1

Bit4 RW 16C 1

Bit3 RW 8C 1

Bit2 RW 4C 1

Bit1 RW 2C 1

Bit0 RW 1C 1

Byte30 Name Control Function Type 0 1 PWD

Bit7 RW 4096 1

Bit6 RW 2048 1

Bit5 RW 1024 1

Bit4 RW 512 1

Bit3 RW 256 1

Bit2 RW 128 1

Bit1 RW 64 1

Bit0 RW 32 1

Byte31 Name Control Function Type 0 1 PWD

Bit7 RW 512 0

Bit6 RW 256 0

Bit5 RW 128 0

Bit4 RW 64 0

Bit3 RW 32 0

Bit2 RW 16 0

Bit1 RW 8 0

Bit0 RW 4 0

Byte32 Name Control Function Type 0 1 PWD

Bit7 RW 4096 0

Bit6 RW 2048 0

Bit5 RW 1024 0

Bit4 RW 512 0

Bit3 RW 256 0

Bit2 RW 128 0

Bit1 RW 64 0

Bit0 RW 32 0

TL_FAN First Temperature Trigger Point of FAN -

TH_FAN Second Temperature Trigger Point of

FAN -

TACH_MAX The Maximum Limit of TACH Number -

TACH_MIN The Minimum Limit of TACH Number -

TACH_S1<12:5> MSB TACH threshold of Static

Mode(T>TL_FAN) -

9TCS1085

MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR, & PWM FAN CONTROLLER FOR PORTABLE DEVICES

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9TCS1085 REV 0.7 012012

Byte33 Name Control Function Type 0 1 PWD

Bit7 RW 16 0

Bit6 RW 8 0

Bit5 RW 4 0

Bit4 RW 2 0

Bit3 RW 1 0

Bit2 Reserved Reserved RW - - 0

Bit1 RW 1

Bit0 RW 0

Byte34 Name Control Function Type 0 1 PWD

Bit7 RW 4096 0

Bit6 RW 2048 0

Bit5 RW 1024 0

Bit4 RW 512 0

Bit3 RW 256 0

Bit2 RW 128 0

Bit1 RW 64 0

Bit0 RW 32 0

Byte35 Name Control Function Type 0 1 PWD

Bit7 RW 16 0

Bit6 RW 8 0

Bit5 RW 4 0

Bit4 RW 2 0

Bit3 RW 1 0

Bit2 FAN MASK Mask Fan Fault RW 0=normal 1=masked 0

Bit1 RW 00 - ALERT=Temp-Sensor

Alert 01 - ALERT=FAN Fault 0

Bit0 RW 10 - ALERT=Temp-Senso

Alert or FAN Fault

10 - ALERT=Temp-Senso

Alert and FAN Fault 0

Byte36 Name Control Function Type 0 1 PWD

Bit7 RW 128 0

Bit6 RW 64 0

Bit5 RW 32 0

Bit4 RW 16 0

Bit3 RW 8 1

Bit2 RW 4 0

Bit1 RW 2 0

Bit0 RW 1 0

TACH_S1<4:0> LSB TACH threshold of Static

Mode(T>TL_FAN) -

FAN_SEL Temperature Selection For FAN

TACH_S2<12:5> MSB TACH threshold of Static

Mode(T>TH_FAN) -

TACH_S2<4:0> LSB TACH threshold of Static

Mode(T>TH_FAN) -

SEL_ALERT Select the ALERT Source

00 - enable, 01~11 disable

PWM Step The PWM DutyCycle

Incremental/Decremental Step -

9TCS1085

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9TCS1085 REV 0.7 012012

Byte37 Name Control Function Type 0 1 PWD

Bit7 Reserved Reserved R - - 0

Bit6 Reserved Reserved R - - 0

Bit5 Reserved Reserved R - - 0

Bit4 Reserved Reserved R - - 0

Bit3 Reserved Reserved R - - 0

Bit2 Reserved Reserved R - - 0

Bit1 FAN_Fault1 FAN TACH measurement is < Minimum

limit (Too Fast) R Non-Flag Flag 0

Bit0 FAN_Fault2 FAN TACH measurement is > Maximum

limit (Too Slow) R Non-Flag Flag 0

Byte38 Name Control Function Type 0 1 PWD

Bit7 R- -0

Bit6 R- -0

Bit5 R- -0

Bit4 R- -0

Bit3 R- -0

Bit2 R- -0

Bit1 R- -0

Bit0 R- -0

Byte 39~ 40 Reserved Register

Byte41 Name Control Function Type 0 1 PWD

Bit7 STOP_27M_48M Stop 27M_48M output RW Stopped Run 1

Bit6 STOP_24M_48M Stop 24M 48M output RW Stopped Run 1

Bit5 EN_STOP25M_C Enable pin for 25M_C after at PWRGD=0 RW Free-Run Stoppable 1

Bit4 EN_STOP25M_B Enable pin for 25M_B after at PWRGD=0 RW Free-Run Stoppable 1

Bit3 EN_STOP25M_A Enable pin for 25M_A after at PWRGD=0 RW Free-Run Stoppable 0

Bit2 STOP_25M_C Stop 25M_C output RW Stopped Run 1

Bit1 STOP_25M_B Stop 25M_B output RW Stopped Run 1

Bit0 STOP_25M_A Stop 25M_A output RW Stopped Run 1

Byte42 Name Control Function Type 0 1 PWD

Bit7 MSB RW - - 0

Bit6 -RW- -0

Bit5 -RW- -0

Bit4 -RW- -1

Bit3 -RW- -1

Bit2 -RW- -1

Bit1 -RW- -1

Bit0 LSB RW - - 1

Byte 43 ~ Byte 46 Reserved Registers

TACH_AIM_OUT Targeted TACH Readback

BYTE COUNT Register

Bit[7:0]

9TCS1085

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9TCS1085 REV 0.7 012012

Byte47 Name Control Function Type 0 1 PWD

Bit7 RW - - 0

Bit6 RW - - 0

Bit5 RW - - 0

Bit4 RW - - 0

Bit3 RW - - 0

Bit2 RW - - 0

Bit1 RW - - 0

Bit0 RW - - 1

Byte 48 ~ Byte 63 Reserved Registers

Byte64 Name Control Function Type 0 1 PWD

Bit7 LCKBYPASSB PLL Lock Bypassb RW Bypass Not Bypas 1

Bit6 RW - - 0

Bit5 RW - - 0

Bit4 RW - - 1

Bit3 RW - - 1

Bit2 RW - - 0

Bit1 RW - - 0

Bit0 RW - - 1

Byte65 Name Control Function Type 0 1 PWD

Bit7 RW - - 0

Bit6 RW - - 0

Bit5 RW - - 0

Bit4 RW - - 1

Bit3 RW - - 1

Bit2 RW - - 0

Bit1 RW - - 1

Bit0 RW - - 1

Byte 66 Reserved Register

Byte67 Name Control Function Type 0 1 PWD

Bit7 RW 00 = 0.5V/ns 01 = 1.0V/ns 0

Bit6 RW 10 = 1.0V/ns 11 = 1.5V/ns 1

Bit5 RW 00 = 1,0V/ns 01 = 1.5V/ns 0

Bit4 RW 10 = 1.5V/ns 11 = 2.0V/ns 1

Bit3 RW 00 = 1,0V/ns 01 = 1.5V/ns 0

Bit2 RW 10 = 1.5V/ns 11 = 2.0V/ns 1

Bit1 RW 00 = 1,0V/ns 01 = 1.5V/ns 0

Bit0 RW 10 = 1.5V/ns 11 = 2.0V/ns 1

VENDOR_ID Vendor ID (IDT=0001)

SL<1:0>(24MHz) 24M Slew Rate Control

***********************************************************************************************************************************************************************************

All reserved bits and reserved bytes in this SMBus table should not be overwritten at any instance. Writing to these

reserved bits and bytes may cause unexpected behavior. IDT does not warrant any application issue going forward if

continuing to overwrite these reserve bits and bytes.

***********************************************************************************************************************************************************************************

REF COUNT<6:0> PLL M Counter

VCO COUNT<9:2> PLL N COUNTER

SL<1:0>(25MHzB) 25M_B Slew Rate Control

SL<1:0>(25MHzA) 25M_A Slew Rate Control

SL<1:0>(27MHz) 27M Slew Rate Control

REV_ID Revision ID

9TCS1085

MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR, & PWM FAN CONTROLLER FOR PORTABLE DEVICES

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9TCS1085 REV 0.7 012012

Frequency Generator 32.768 kHz

Recommended 25MHz Quartz Crystal

Specifications

SMD 25MHz AT cut crystal and maximum driver level at

100µW, for example TXC.

VBAT Battery Recommendations and

Connection Considerations

Recommended to use coin cell battery CR2032, CR2025 or

equivalent.

The normal coin cell battery storage capacity is 170 mAh to

220mAh and the average total RTC circuit current required

5uA, the battery life will be at least:

170,000 µAh / 5 µA = 34,000 hours = 3.88 years

The RTC circuit (PCH) usually consumes 3µA power, thus

the 32.768kHz clock generator circuit needs be less than

2µA. The 9TCS1085 32.768kHz generator averaged

operation current is less than 2µA.

The coin cell battery with 9TCS1085 VBAT power pin

connection required a 100 ohm and 22µF ceramic capacitor

current limitation and noise filtering. The RC needs to be

added to the battery to limit the current spikes effects.

The VDD_RTC connect to the Intel ICH chip and the

9TCS1085 provide seamless power switching between

main V_3.3 and V_bat.

32.768K Clocks Operation

The 9TCS1085 32.768K clock output operates in two

modes:

1. When the system is not power ON, V_3.3 is not ready and

9TCS1085 is powered with the coin cell battery. The 32kHz

comes from the DCO with the digital calibration to keep the

accuracy.

2. After V_3.3 is ready, the 9TCS1085 creates a seamless

switch power from V_bat to V_3.3 and the calibration will go

to full speed: this will happen every 2~3ms to keep the

accuracy and the 32K source will be switched to 25MHz

oscillator with Fraction-N divider to get the 0ppm.

32.768K DCO uses a 25Mhz crystal oscillator for calibration

reference, thus the 25MHz oscillator must be fine tuned in

order to get the best 32.768kHz accuracy.

RTC Routing Guidelines

V_bat

VDD_RTC

CR2032H

100

10~22uF

9TCS1085

Power Switch

V_3.3

1uf

Single

ace impedan

Length Notes

X1 50 ohm 6 inches

X2 50 ohm 6 inches

9TCS1085

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9TCS1085 REV 0.7 012012

Reference Schematic For VBAT and VDD_RTC

VDD_RTC

V_bat

SMBCLK

V_3.3

PWM

TACH

SMBDAT

ALERT#

THERM#

9TCS1085

GND

32K_A

32K_B / 25M_C

VDD_32KB

25M_A

VDDIO_25MA

25M_B

VDD_25MB

24M_48M

VDD_24/48M

VDD_27/48M

VDD_TS

VCC

PWM

TACH

GND

5V/12V 4-wire

FAN

5V/12V

10K

3.3V/5V

10K

4.7K

DXP1

DXN1

Vdd_RTC

CLK

100 ohm

10uf

To Smbus

master

25Mhz crystal

To system I2C

or Int.

To system H/W

or Int.

V_bat

(Coin Cell

battery)

V_3.3

CLK

27M_48M CLK

1uf

VDD_32KB

VDDIO_25MA

VDD_25MB

VDD_24M

VDD_27M

9TCS1085

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Frequency Synthesizer – 24/48/27/25 MHz

The 9TCS1085 includes a low power PLL to generate

24/27/48 MHz clock outputs. The PLL uses an external

25MHz crystal for reference clock input, thus all 25MHz

clock outputs are through a fanout buffer directly for optimal

performance. Fine tuning on the external crystal cap load is

required to get an accurate 25MHz reference clock.

25MHz_A Connection Recommendations

a. VDDIO_25A range is from 1.05V to 3.3V.

b. Optimize range is 1.05V to 1.5V.

c. Pull up strength is 50 ohm@VDDIO_25A=1.5V

d. Pull down strength is 50 ohm.

e. No on-board 33 ohm series resistor is required.

25MHz_B/C Connection Recommendations

a. VDD_25B/C range is from 1.05V to 3.3V.

b. Optimized for 3.3V VDDIO.

c. Pull up strength is 50 ohm@VDD_25B/C=3.3V

d. Pull down strength is 50 ohm.

e. No on-board 33 ohm series resistor is required.

24/27/48MHz Connection Recommendations

a. Default 2X push-pull IO drive strength for 24/48/27MHz.

b. On board 27 ohm series resistor for each path.

c. Rising/falling slew rate: 1v/ns~4v/ns

d. 2 bits (3 steps) I2C for the Slew Rate.

CLK_25A

VDDIO_25

4pF

Z= 50 ohm

0 ohm

CLK_25B/C

VDDIO_25

5pF

Z= 50 ohm

0 ohm

CLK_24/48/

27M

VDD_24M/27M

5pF

Z= 50 ohm

5pF

Z= 50 ohm

27 ohm

9TCS1085

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Thermal Sensor

The thermal sensor in the 9TCS1085 is a low power and highly accurate temperature sensor. It is optimized to operate

between 60°C to 100°C with an external thermal diode connection input. There are diode faults and temperature alerts for

the thermal sensor; Moreover, the thermal sensor has the capability to go into standby mode for power savings.

The temperature sensor's analog to digital converter (ADC) has 11 bits of resolution. One LSB is equal to 0.125°C. The

accuracy of the temperature sensor is ±1°C between 60°C to 100°C.

The 9TCS1085 temperature sensor has the ability to cancel the series resistance on the remote diode inputs. Parasitic

resistances to the DXP and DXN inputs seen in series with the remote diode are caused by PCB trace resistance along with

the overall length, bulk parasitic resistance in the remote temperature transistor junctions, and series resistance in the CPU.

This resistance appears as a temperature offset in the thermal sensor measurement and is approximately +0.7°C per Ohm.

The 9TCS1085 has the ability to cancel up to 100Ω of series resistance.

The thermal sensor in 9TCS1085 outputs the measured temperature from a beta compensated temperature reading from

an external diode. The temperature sensor architecture uses an on-chip ADC as shown to convert the analog temperature

into an 11-bit digital code. Using averaging techniques along with the ADC architecture allows accurate temperature

measurements. The ability to have programmable conversion rates and adjustable averaging schemes allow the user the

flexibility to balance accuracy versus conversion speed per the system requirements.

The temperature measurement relies on the characteristics of a semiconductor junction operating at a fixed current level.

Forcing a fixed current through the temperature diodes and detecting the changes in VBE, the forward voltage of the diode,

the temperature proportionality can be determined.

External Thermal Diode Selection

The 9TCS1085 supports the following temperature diodes:

•Typical remote substrate transistor (i.e. CPU substrate PNP intrinsic diode)

•Discrete PNP transistor diode (i.e. 2N3906)

•Discrete NPN transistor diode (i.e. 2N3904)

NPN 2N3904

Analog MUX

Channel 1

Current Driver BGP Ref

Temp Sensor

Dector

Timing Generator

11 bit ADC Temperature Reg

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When the thermal sensor is used in a noisy environment, a capacitor can be connected across DXP and DXN to provide

some noise filtering capabilities. However, large capacitances affect the accuracy of the temperature measurement. A

maximum capacitance of 300pF can be used to help mitigate the noise.

Thermal Diode Fault Conditions

9TCS1085 has the ability to detect an open or a short condition for each temperature sensor diode. An external diode fault

is defined as one of the following:

•An open between DXP and DXN

•A short from VDD to DXP

•A short from VDD to DXN

The diode fault monitoring is enabled at the start of every temperature measurement. When an external diode fault is

detected, the ALERT# pin asserts and the temperature data reads 00h in the MSB and LSB of the corresponding

temperature registers:

•DX1 MSB - byte[17], bit[2:0]

•DX1 LSB - byte[16], bit[7:0]

During the fault condition, byte[13], bit[1] or bit[0], will be set depending on the channel that has the fault. Bit[1] corresponds

to DX1, and furthermore, an open/short fault flag will be set in register byte[14], bit[4].

DXP

DXN

PNP

transistor

i.e. to CPU

DXP

DXN

PNP

transistor

i.e. 2N3906

DXP

DXN

NPN

transister

i.e. 2N3904

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Temperature Threshold Alerts

Through register writes, the high and low temperature limits

can be set such that it will trigger an alert. This alert can be

monitored through the registers or can be sent to the

ALERT# pin. Each channel has its own programmable

(1) High Temperature Alert (default 127°C)

Where byte[0] is the high temperature alert for DX1.

(2) Low Temperature Alert (default 127°C)

Where byte[3] is the low alert for DX1, byte[4] is for DX2.

Temperature Threshold Alert Status

When a temperature threshold alert is activated, a status

indicator bit is also set. Register byte[14], bit[6:5] will be set

depending on the high or low alert. Bit[6] is the high and

bit[5] is the low alert flag. To clear the alert, register

byte[15], bit[7] needs to be written with a "1". Writing this bit

will also clear the critical thermal warnings.

Temperature Threshold ALERT# Pin

The temperature threshold alerts are sent to the ALERT#

pin. To mask this alert being sent to the ALERT# pin, set

Consecutive Alerts

The number of temperature threshold alerts before the

assertion of the ALERT# pin can be set by the user through

Temperature Threshold Alert Alarm Register

All three temperature channels have a readable registers,

byte[13], bit[7:2] that is set when a temperature threshold

alert has occurred. Bit[3:2] is for temperature high and low

thresholds.

Critical Thermal Warnings

The 9TCS1085 will have register programmable critical

thermal threshold warnings for all three temperature sensor

channels. Similar to the temperature threshold alerts, the

critical high temperatures can be set such that a warning

can be dispatched to the THERM# pin and the readable

registers. The thermal warnings also have programmable

hysteresis. Each channel has its own programmable

(1) Critical Thermal Warning (default 127°C)

Where byte[7] is the critical thermal warning for DX1.

Byte[2:0], Bit[7:0] Temperature

Bit[7] Sign Bit

Bit[6] 64°C

Bit[5] 32°C

Bit[4] 16°C

Bit[3] 8°C

Bit[2] 4°C

Bit[1] 2°C

Bit[0] 1°C

Byte[5:3], Bit[7:0] Temperature

Bit[7] Sign Bit

Bit[6] 64°C

Bit[5] 32°C

Bit[4] 16°C

Bit[3] 8°C

Bit[2] 4°C

Bit[1] 2°C

Bit[0] 1°C

Byte[6], Bit[3:2] Number of Alert Events

[00] (default) 1

[01] 2

[10] 3

[11] 4

Byte[9:7], Bit[6:0] Temperature

Bit[6] 64°C

Bit[5] 32°C

Bit[4] 16°C

Bit[3] 8°C

Bit[2] 4°C

Bit[1] 2°C

Bit[0] 1°C

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(2) Critical Thermal Warning Temperature Hysteresis

(default 4°C)

Critical Thermal Warning Status

When a critical warning is activated, a status indicator bit is

also set. Register byte[14], bit[2] will be set when the critical

event happens.

Critical Thermal Warning THERM# Pin

The critical thermal warnings are sent to the THERM# pin

and requires a system register write to byte[15], bit[7] to

reset. This fault clear I2C write will also clear the

temperature threshold alerts

Active/Standby Mode

The thermal sensor has two modes in the temperature

conversion process:

(1) Active mode – In this mode the ADC will have a

selectable conversion rate for the temperature sensing.

(2) Standby mode – The system will command via I2C the

9TCS1085 to sample the temperature sensors. Once the

temperature reading from the ADC is updated, the

temperature sensor will be on stand-by awaiting the next

system request.

is in active or standby mode.

The conversion rate programmable register detail is as

follows:

* Valid when only one temperature sensor channel is used.

** Valid when the number of temperature sensor channel is

less than three.

The thermal sensor architecture has dynamic averaging to

smooth out the temperature conversion readings. To select

the number of temperature reading averages requires the

dynamic averaging function to be enabled, register byte[15],

bit[5]. The number of averages is then selected as follows:

Byte[12], Bit[4:0] Temperature

Bit[4] 16°C

Bit[3] 8°C

Bit[2] (default) 4°C

Bit[1] 2°C

Bit[0] 1°C

Byte[17], Bit[4:1] Conversion Rate

[0000] 16/sec *

[0001] 8/sec **

[0010] (default) 4/sec

[0011] 2/sec

[0100] 1/sec

[0101] 1/2 sec

[0110] 1/4 sec

[0111] 1/8 sec

[1000] 1/16 sec

[1001] 1/32 sec

[1010] 1/64 sec

Byte[6], Bit[1:0] Average the ADC Temperature

[00] 1

[01] 4

[10] 8

[11] 16

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Fan Controller

Fan Controller Description

The fan driver for the 9TCS1085 controls a 4-wire, 12V or

5V, multiple pole DC fan. The fan controller has three

modes of operation: (1) Direct drive, (2) Thermal trigger, and

(3) Dynamic PWM. All modes have register

programmability for the user to set the desired fan speed

and necessary parameters. The controller is also capable

of detecting stalled fans and upon detection will set the

appropriate alerts. The 9TCS1085 also has user

configuration registers to adjust both the ramp-rate and the

spin-up routine to accommodate different fan start up

requirements.

The fan controller uses the input from the external diode

connections. The 9TCS1085 fan controller can be set to run

a user specified fan speed. In this mode the tachometer

signal from the fan will be ignored. In thermal trigger mode,

the user specifies the temperature thresholds, the

temperature threshold hysteresis, and the corresponding

fan speed (fan tachometer target) for the different

temperature zones defined by the thresholds. The

controller will then run the fan at the specified fixed fan

speed settings depending on the temperature from the

sensors. In dynamic PWM mode, the fan controller will

adjust the PWM duty cycle to maintain the system defined

fan speed. In this mode, the system reads a temperature

sensor and the corresponding fan speed, tachometer

reading. The system will then determine and update the

9TCS1085 directly by writing the accessible registers byte

32 and byte 33. 9TCS1085 will then adjust the PWM to

achieve the desired system fan speed.

The PWM has ten bits of duty cycle resolution with a 25kHz

frequency. The PWM frequency is selectable between 22,

25, and 27kHz.

The 9TCS1085 includes hardware programmable

temperature limits and dedicated system shutdown output

for thermal protection.

Fan Controller System Diagram (Schematic

Example)

Fan Selection Detail

The 9TCS1085 fan controller will control 5V - 12V Brushless

DC fans. The fans need to be 4-wire fans and can have one

to four poles. The number of fan poles is specified in

Modes of Operation

The 9TCS1085 fan controller has three user selectable

methods to control the fan speed. The default fan speed

control mode is Thermal Trigger mode. The modes are

selected by writing the I2C register byte[24], bit[7:6] as

follows:

The PWM frequency can be set by writing register byte[24],

bit[5:4] as follows:

Byte[24], Bit[3:2] Fan Poles

[00] 1

[01] (default) 2

[10] 3

[11] 4

Fan Controller Modes Byte[24], Bit[7:6]

Direct Drive [00]

Thermal Trigger [01]

Dynamic PWM (default) [10]

PWM

Frequency

Duty Cycle

Resolution [# bits]

Byte[24],

Bit[5:4]

25kHz (default) 10 00

22kHz 11 01

27kHz 9 10

IDT

Mobile Access

9TCS1085

PWM

TACH

VCC

PWM

TACH

GND

5V/12V 4-wire FAN

5V/12V5V/12V

10K

3.3V/5V

10K

4.7K

9TCS1085

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Direct Drive Mode

In Direct Drive Mode, the fan speed is directly controlled by

setting a fixed PWM duty cycle. After a proper fan speed

spin-up, the tachometer signal will be ignored and the

9TCS1085 will output the fixed programmed PWM duty

cycle to the fan.

To operate in direct drive mode, Register byte[24], bit[7:6] =

[00].

The duty cycle is selectable through registers by writing

byte[26], bit[7:0] and byte[27], bit[7:5] as follows:

It is important to also set the required fan spin-up specifics

for proper use. The 9TCS1085 after completion of the fan

spin-up routine will then put out the correct programmed

PWM duty cycle.

Thermal Trigger Mode

In this mode the 9TCS1085 fan speed controller is

programmed to run at different fan speeds. The 9TCS1085

will monitor the fan tachometer and depending on the

temperature from a thermal sensor diode and the

pre-programmed temperature settings, the 9TCS1085 will

adjust the fan speed to the targeted tachometer settings.

thermal trigger mode.

Temperature Sensor

The temperature can be set to read from the external

thermal sensors; it is selected by byte33b[1:0]=00.

FAN_CH_SEL - byte[33], bit[1:0]

Tachometer Update

The tachometer reading can be updated at a rate of

700msec up to 100msecs. Tachometer Update Time,

byte[27], bit[4:2]

Byte[26], Bit[7:0] Logic "1", Selects Duty Cycle

Bit[7] 1

Bit[6] 1/2

Bit[5] 1/4

Bit[4] 1/8

Bit[3] 1/16

Bit[2] 1/32

Bit[1] 1/64

Bit[0] 1/128

Byte[27], Bit[7:5] Logic "1", Selects Duty Cycle

Bit[7] 1/256

Bit[6] 1/512

Bit[5] 1/1024

Byte[33], bit[1:0] Temperature Sensor

Enable/Disable

[00] 00=ON, 01~11=disable

Byte[27], bit[4:2] Tachometer Update Time

[000] 100 msec

[001] 200 msec

[010] 300 msec

[011] (default) 400 msec

[100] 500 msec

[101] 600 msec

[110] 700 msec

[111] 800 msec

9TCS1085

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Example of Thermal Trigger Mode Setup

The figure below shows how the programmable thresholds

relate to the fan speed settings.

From the figure above, it can be seen that the fan speed will

adjust between the tachometer settings TACH_S1 and

TACH_S2 given the temperature from the thermal sensor.

The temperature thresholds are set by TH_FAN and

TL_FAN along with the temperature hysteresis, T_HYS. In

this mode, the fan will have active fault condition monitoring

along with fan spin-up control. The rate at which the fan will

speed up or slow down, going from one TACH setting to the

other, can be programmed by the user. Lastly, the fan speed

tolerance can also be selectable via registers.

To set up the fan speed controller in Thermal Trigger Mode,

the following registers will need to be programmed.

(1) Temperature Thresholds:

a. TL_FAN - byte[28], bit[6:0] (default 127°C)

b. TH_FAN - byte[29], bit[6:0] (default 127°C)

To set TL_FAN and TH_FAN a logic "1" is written into the

proper register. For example, to get 70°C, a "1" would be

written for Bit[6], Bit[2], and Bit[1].

(2) Temperature Hysteresis, T_HYS, byte[27], bit[1:0]:

(3) Tachometer Targets:

a. TACH_S1 - byte[32], bit[7:0] and byte[33], bit[7:3]

Byte[28], Bit[7:0] Logic "1", Selects Temp Threshold

Bit[7] —

Bit[6] 64°C

Bit[5] 32°C

Bit[4] 16°C

Bit[3] 8°C

Bit[2] 4°C

Bit[1] 2°C

Bit[0] 1°C

TempSenser Temperature

Fan Speed

Thermal Hysteresis

TACH_S2

TACH_S1

FAN OFF

TH_FAN

TL_FAN

Byte[29], Bit[7:0] Logic "1", Selects Temp Threshold

Bit[7] —

Bit[6] 64°C

Bit[5] 32°C

Bit[4] 16°C

Bit[3] 8°C

Bit[2] 4°C

Bit[1] 2°C

Bit[0] 1°C

Byte[27], bit[1:0] Temperature Threshold Hysteresis

[00] 2°C

[01] 5°C

[10] 10°C

[11] (default) 15°C

Byte[32], bit[7:0] Logic "1" selects Tachometer

Reading

Bit[7] 4096

Bit[6] 2048

Bit[5] 1024

Bit[4] 512

Bit[3] 256

Bit[2] 128

Bit[1] 64

Bit[0] 32

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b. TACH_S2 - byte[34], bit[7:0] and byte[35], bit[7:3]

The TACH_S1/S2 is set using the following RPM formula:

where: RPM - fan revolution per minute

Fsample - 25kHz sample internal clock sample rate

TACH_Reading - user programmable registers Byte[32]

through Byte[35]

(4) To Set the minimum and maximum fan speed, use

the RPM formula, “Formula 1”.

a. TACH_MIN - byte[31], bit[7:0]

b. TACH_MAX - byte[30, bit[7:0]

(5) To adjust the rate at which the fan speed will

transition from one TACH setting to the other, the RPM

equation, “Formula 1” is again applied to determine the

incremental or decremental fan speed step size.

Tachometer PWM Step Control - byte[36], bit[7:0]

Byte[33],

bit[7:3]

Logic "1" selects Tachometer

Reading

Bit[7] 16

Bit[6] 8

Bit[5] 4

Bit[4] 2

Bit[3] 1

Byte[34], bit[7:0] Logic "1" selects Tachometer

Reading

Bit[7] 4096

Bit[6] 2048

Bit[5] 1024

Bit[4] 512

Bit[3] 256

Bit[2] 128

Bit[1] 64

Bit[0] 32

Byte[35], bit[7:3] Logic "1" selects Tachometer

Reading

Bit[7] 16

Bit[6] 8

Bit[5] 4

Bit[4 2

Bit[3] 1

_Re

2sample TACH ading

RPM F=× ×

(Formula 1)

Byte[31], bit[7:0] Logic "1" selects Tachometer

Reading

Bit[7] 512

Bit[6] 256

Bit[5] 128

Bit[4] 64

Bit[3] 32

Bit[2] 16

Bit[1] 8

Bit[0] 4

Byte[30], bit[7:0] Logic "1" selects Tachometer

Reading

Bit[7] 4096

Bit[6] 2048

Bit[5] 1024

Bit[4] 512

Bit[3] 256

Bit[2] 128

Bit[1] 64

Bit[0] 32

Byte[36], bit[7:0] Logic "1" selects Tachometer

Reading

Bit[7] 128

Bit[6] 64

Bit[5] 32

Bit[4] 16

Bit[3] 8

Bit[2] 4

Bit[1] 2

Bit[0] 1

9TCS1085

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Spin-up

In this mode the fan controller will also have spin-up control

capabilities. At any time the fan attempts to go from a zero

RPM to a higher fan speed, the fan will always go through

the proper spin-up routine. The time allotted for fan spin-up

as well as the spin-up PWM duty cycle can be adjusted via

registers by writing byte[25], bit[7:3] as follows:

Spin-up Time - byte[25], bit[7:6]

Spin-up PWM duty cycle - byte[25], bit[5:3]

Dynamic PWM Mode

The 9TCS1085 in this mode will be directed by the system

via registers as to the target RPM by which the fan speed

should be running. The system will read a temperature

sensor along with the fan tachometer information and make

the determination as to what the nominal fan speed should

be. This information is fed back to the 9TCS1085 via

the fan at the requested speed.

To put the 9TCS1085 in Dynamic PWM mode register

byte[24], bit[7:6] = [10]

The system will poll byte[22], bit[7:0], and byte[23], bit[4:0]

for the TACH reading which will correlate to the current fan

speed by the RPM equation, “Formula 1”.

The system can read the temperature sensor diodes from

the 9TCS1085 or from any sensor available to the system to

determine the necessary adjustments to the fan speed.

Byte[25], bit[7:6] Spin-up Time

Bit[7:6] = [00] 250msec

Bit[7:6] = [01] (default) 500msec

Bit[7:6] = [10] 1sec

Bit[7:6] = [11] 2sec

Byte[25], bit[5:3] Spin-up PWM duty cycle

Bit[5:3] = [000] 30%

Bit[5:3] = [001] 35%

Bit[5:3] = [010] 40%

Bit[5:3] = [011] 45%

Bit[5:3] = [100] 50%

Bit[5:3] = [101] 55%

Bit[5:3] = [110] (default) 60%

Bit[5:3] = [111] 65%

Byte[22], bit[7:0] Logic "1" selects Tachometer

Reading

Bit[7] 128

Bit[6] 64

Bit[5] 32

Bit[4] 16

Bit[3] 8

Bit[2] 4

Bit[1] 2

Bit[0] 1

Byte[23], bit[4:0] Logic "1" selects Tachometer

Reading

Bit[7] 4096

Bit[6] 2048

Bit[5] 1024

Bit[4] 512

Bit[3] 256

9TCS1085

MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR, & PWM FAN CONTROLLER FOR PORTABLE DEVICES

IDT®

MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR, & PWM FAN CONTROLLER FOR PORTABLE DEVICES 34

9TCS1085 REV 0.7 012012

System Direct Tachometer Control

The system will directly write to register byte[32], bit[7:0] and

byte[33], bit[7:3] a desired TACH setting.

The tachometer setting is related to the fan speed by the

RPM equation, “Formula 1”.

Setting Minimum and Maximum Tachometer

RPM

The minimum and maximum tachometer settings can be set

for the fan faults.

a. TACH_MIN - byte[31], bit[7:0]

b. TACH_MAX - byte[30, bit[7:0]

Fan Fault Conditions

The fan fault conditions will be activated and reported if the

minimum or maximum fan speed is detected. During a

FAULT1, maximum fan speed, 9TCS1085 will stop the fan

and then wait for the FAULT1 flag to be cleared. For a

FAULT2 condition, stalled fan, 9TCS1085 will go through the

spin-up procedure to try to start the fan. The number of

attempts to try to restart the fan is programmable. The fan

fault conditions are reported via register on byte[37], bit[1;0].

Fan Fault Conditions

The number of times for spin-up retries:

Byte[32], bit[7:0] Logic "1" selects Tachometer

Reading

Bit[7] 4096

Bit[6] 2048

Bit[5] 1024

Bit[4] 512

Bit[3] 256

Bit[2] 128

Bit[1] 64

Bit[0] 32

Byte[33], bit[7:3] Logic "1" selects Tachometer

Reading

Bit[7] 16

Bit[6] 8

Bit[5] 4

Bit[4] 2

Bit[3] 1

Byte[31], bit[7:0] Logic "1" selects Tachometer

Reading

Bit[7] 512

Bit[6] 256

Bit[5] 128

Bit[4] 64

Bit[3] 32

Bit[2] 16

Bit[1] 8

Bit[0] 4

Byte[30], bit[7:0] Logic "1" selects Tachometer

Reading

Bit[7] 4096

Bit[6] 2048

Bit[5] 1024

Bit[4] 512

Bit[3] 256

Bit[2] 128

Bit[1] 64

Bit[0] 32

Byte[37], bit[1:0] Logic "1" = FAULT CONDITION

Bit[1] Fault1 - Fan speed too fast

Bit[0] Fault2 - Fan speed too slow

Byte[25], bit[2:1] Number of Spin-up Attempts

[00] 3

[01] (default) 4

[10] 5

[11] 6

9TCS1085

MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR, & PWM FAN CONTROLLER FOR PORTABLE DEVICES

IDT®

MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR, & PWM FAN CONTROLLER FOR PORTABLE DEVICES 35

9TCS1085 REV 0.7 012012

Spin-up Details

1. The spin-up time can be specified in register byte[25],

bit[7:6].

Spin-up Time - byte[25], bit[7:6]

2. During spin-up, the PWM duty cycle can be set to 100%

for one quarter of the total spin-up time by register byte[25],

bit[0].

3. The next three quarters of the spin-up time, the PWM duty

cycle is set by register[25], bit[5:3].

Spin-up PWM duty cycle - byte[25], bit[5:3]

Fan Controller Temperature Diode Sensor

The fan controller can use either one of the three channels

for temperature sensing. To specify which temperature

sensor is used for the fan controller, register byte[33],

bit[1:0].

100% *

30%~65%

Target count

Step

¼ of

spin up

time Update

Time

Update

Time

Update

Time

Spin Up Time

Target count reached

Step

Byte[25], bit[7:6] Spin-up Time

Bit[7:6] = [00] 250msec

Bit[7:6] = [01] (default) 500msec

Bit[7:6] = [10] 1sec

Bit[7:6] = [11] 2sec

Byte[25], bit[5:3] Spin-up PWM duty cycle

Bit[5:3] = [000] 30%

Bit[5:3] = [001] 35%

Bit[5:3] = [010] 40%

Bit[5:3] = [011] 45%

Bit[5:3] = [100] 50%

Bit[5:3] = [101] 55%

Bit[5:3] = [110] (default) 60%

Bit[5:3] = [111] 65%

9TCS1085

MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR, & PWM FAN CONTROLLER FOR PORTABLE DEVICES

IDT®

MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR, & PWM FAN CONTROLLER FOR PORTABLE DEVICES 36

9TCS1085 REV 0.7 012012

Marking Diagram (NLG32)

Notes:

1. “######” is the lot number.

2. YYWW is the last two digits of the year and week that the part was assembled.

3. “$$$” is the assembly mark code..

4. “B” at the end of the part number is the device revision desigantor; does not correlate with the datasheet revision.

5. Bottom marking: country of origin if not USA.

Thermal Characteristics 32-pin VFQFPN

IDT

9TCS1085B

$$$

YYWW

######

Parameter Symbol Conditions Min. Typ. Max. Units

Thermal Resistance Junction to

Ambient

θJA Still air 34 °C/W

θJA 1 m/s air flow 29 °C/W

θJA 3 m/s air flow 27 °C/W

Thermal Resistance Junction to Case θJC 32 °C/W

9TCS1085

MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR, & PWM FAN CONTROLLER FOR PORTABLE DEVICES

IDT®

MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR, & PWM FAN CONTROLLER FOR PORTABLE DEVICES 37

9TCS1085 REV 0.7 012012

Package Outline and Package Dimensions (32-pin VFQFPN, 0.50mm pitch)

Package dimensions are kept current with JEDEC Publication No. 95

Ordering Information

“G” after the two-letter package code are the Pb-Free configuration and are RoHS compliant.

While the information presented herein has been checked for both accuracy and reliability, Integrated Device Technology (IDT) assumes

no responsibility for either its use or for the infringement of any patents or other rights of third parties, which would result from its use. No

other circuits, patents, or licenses are implied. This product is intended for use in normal commercial applications. Any other applications

such as those requiring extended temperature range, high reliability, or other extraordinary environmental requirements are not

recommended without additional processing by IDT. IDT reserves the right to change any circuitry or specifications without notice. IDT

does not authorize or warrant any IDT product for use in life support devices or critical medical instruments.

Part / Order Number Marking Shipping Packaging Package Temperature

9TCS1085BNLG see page 36 Trays 32-pin VFQFPN 0 to +70° C

9TCS1085BNLG8 Tape and Reel 32-pin VFQFPN 0 to +70° C

Technology, Inc. Accelerated Thinking is a service mark of Integrated Device Technology, Inc. All other brands, product names and marks are or may be trademarks or registered

trademarks used to identify products or services of their respective owners.

Printed in USA

Corporate Headquarters

Integrated Device Technology, Inc.

www.idt.com

For Sales

800-345-7015

408-284-8200

Fax: 408-284-2775

For Tech Support

www.idt.com/go/clockhelp

Innovate with IDT and accelerate your future networks. Contact:

www.IDT.com

9TCS1085

MOBILE ACCESS™—CLOCK SYNTHESIZER, TEMPERATURE SENSOR, & PWM FAN CONTROLLER FOR PORTABLE DEVICES