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© 2010 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN5702 • Rev. 1.8
FAN5702 — Configurable 180 mA 6-LED Driver with I2C Control
FAN5702
Configurable 180 mA 6-LED Driver with I2C Control
Features
Six (6) Parallel LEDs (up to 30 mA Each)
Total Package Load Current Capability: 180 mA
Group from 2 to 6 LEDs for Flexible Backlighting
I2C Interface for Easy Programming
>600:1 Dimming Ratio for 100 Hz PWM Frequency
Logarithmically Controlled Dimming with 64 Steps
Secondary Brightness Control Using PWM Dimming
up to 20 kHz in Conjunction with I2C Dimming
- Dynamic Backlight Control (DBC) to Reduce Current
Consumption
Up to 92% Efficiency
Built-in 1.5x Charge Pump with Low Drop-Out Bypass
Switch and automatic switching to 1x mode
1.2 MHz Switching Frequency for Small-Sized
Capacitors
16-Bump 1.6 mm x 1.6 mm WLCSP (0.6 mm Height)
16-Lead 3.0 mm x 3.0 mm UMLP (0.55 mm Height)
Applications
LCD Backlighting
Mobile Handsets / Smartphones
Portable Media Players
Description
The FAN5702 is a highly integrated and configurable charge-
pump-based multi-LED driver. The device can drive up to six
LEDs in parallel with a total output current of 180 mA.
Regulated internal current sinks deliver excellent current and
brightness matching to all LEDs.
The FAN5702 has an I2C interface that allows the user to
independently control the brightness with a default grouping
of 2,1,1,1,1 for a maximum of five independent lighting
channels. The LED driver can be programmed in a multitude
of configurations to address broad lighting requirements for
different platforms. Each LED can be configured through I2C
as five independent channels (Group A has two LEDs by
default) or any additional LEDs can join Group A to increase
the backlighting needs as the display size increases. The
device offers a second dimming control using the EN/PWM
pin. Applying a PWM dimming signal to this pin allows
control of the dimming of Group A LEDs so that the average
current is the linear value multiplied by the PWM dimming
duty-cycle.
The device provides excellent efficiency, without an inductor,
by operating the charge pump in 1.5x or pass-through mode.
The FAN5702 can be ordered with default ISET values of
30 mA, 20 mA, 15 mA, or 8 mA. The default ISET is always
determined by the ISET ordered (see Ordering Information).
Ordering Information
Part Number
LED Current
(ISET)
Temperature
Range
Package
Packing
FAN5702UC30X
30 mA
-40 to 85°C
WLCSP-16, 0.4 mm Pitch
Tape and Reel
FAN5702UC20X
20 mA
FAN5702UC15X
15 mA
FAN5702UC08X
8 mA
FAN5702UMP30X
30 mA
UMLP-16, 3.0 x 3.0 x 0.55 mm
Tape and Reel
FAN5702UMP20X
20 mA
FAN5702UMP15X
15 mA
FAN5702UMP08X
8 mA
© 2010 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN5702 • Rev. 1.8 2
FAN5702 — Configurable 180 mA 6-LED Driver with I2C Control
Typical Application
Figure 1. Typical Application
CURRENT SINKS
VIN
C1+
C1–
1F
C2+
C2–
SCL
SDA
EN /
PWM
LOGIC AND
CONTROL
GND
CHARGE
PUMP
D6
D5
D4
D3
D2A
D1A
GROUP A
1F
1F
VOUT
1FCOUT
expandable to 6 LEDs
© 2010 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN5702 • Rev. 1.8 3
FAN5702 — Configurable 180 mA 6-LED Driver with I2C Control
WLCSP Pin Configuration
Bumps Facing Up
Figure 2. WLCSP-16, 0.4 mm Pitch, 1.61 x 1.61 mm
Pin Definitions
Pin #
Name
Description
D2
VIN
Input Supply Voltage. Connect to 2.7 – 5.5 VDC input power source.
B4
GND
Ground
D1
VOUT
Charge Pump Output Voltage. Connect to LED anodes.
D3 ,D4
C1+, C1–
Charge pump flying capacitor #1
C3, C4
C2+, C2–
Charge pump flying capacitor #2
A1,A2
B1,B2
C1,C2
D2A, D1A
D4,D3
D6,D5
LED Outputs
A4
EN / PWM
Enable / PWM dimming input. By default, this pin acts as a simple enable / disable function.
When this pin is HIGH, normal operation is enabled. When LOW, the IC is reset and all functions
(including I2C communications) are disabled. By setting General Purpose register bit 7 = 1, the pin
functions as a PWM dimming input for Group A. To restore the Enable function, the General
Purpose register bit 7 must be set LOW.
B3
SDA
I2C interface serial data
A3
SCL
I2C interface serial clock
C1
B1
A1 A2
C3
B3
A3
C2
D1 D3D2
B2
A4
C4
D4
B4
C4
B4
A4
C3
B3
A3
D4 D3
C1
B1
A1A2
C2
D1D2
B2
© 2010 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN5702 • Rev. 1.8 4
FAN5702 — Configurable 180 mA 6-LED Driver with I2C Control
UMLP Pin Configuration
Bottom View
Figure 3. UMLP-16, 0.5 mm Pitch, 3 mm x 3 mm
Pin Definitions
Pin #
Name
Description
11
VIN
Input Supply Voltage. Connect to 2.7 – 5.5 VDC input power source.
6
GND
Ground
12
VOUT
Charge Pump Output Voltage. Connect to LED anodes.
10,9
C1+, C1–
Charge pump flying capacitor #1
8,7
C2+, C2–
Charge pump flying capacitor #2
1, 2
15, 16
13, 14
D2A, D1A
D4,D3
D6,D5
LED Outputs
4
EN / PWM
Enable / PWM dimming input. By default, this pin acts as a simple enable / disable function.
When this pin is HIGH, normal operation is enabled. When LOW, the IC is reset and all functions
(including I2C communications) are disabled. By setting General Purpose register bit 7 = 1, the pin
functions as a PWM dimming input for Group A. To restore the Enable function, the General
Purpose register bit 7 must be set LOW.
5
SDA
I2C interface serial data
3
SCL
I2C interface serial clock
1
16
4
5 8
9
12
13
© 2010 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN5702 • Rev. 1.8 5
FAN5702 — Configurable 180 mA 6-LED Driver with I2C Control
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above
the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended
exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum
ratings are stress ratings only.
Symbol
Parameter
Min.
Max.
Unit
VCC
VIN, VOUT Pins
–0.3
6.0
V
Other Pins(1)
–0.3
VIN + 0.3
V
ESD
Electrostatic Discharge
Protection Level
Human Body Model per JESD22-A114
3
kV
Charged Device Model per JESD22-C101
2
TJ
Junction Temperature
–40
+150
°C
TSTG
Storage Temperature
–65
+150
°C
TL
Lead Soldering Temperature, 10 Seconds
+260
°C
Note:
1. Lesser of VIN + 0.3 or 6.0 V.
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating
conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend
exceeding them or designing to absolute maximum ratings.
Symbol
Parameter
Min.
Max.
Unit
VIN
Supply Voltage
2.7
5.5
V
VLED
LED Forward Voltage
2
4
V
TA
Ambient Temperature
–40
+85
°C
TJ
Junction Temperature
–40
+125
°C
Thermal Properties
Symbol
Parameter
Min.
Typ.
Max.
Unit
ΘJA
Junction-to-Ambient Thermal Resistance
WLCSP
80
°C/W
UMLP
49
Note:
2. Junction-to-ambient thermal resistance is a function of application and board layout. This data is measured with four-layer
2s2p boards in accordance to JESD51-7 JEDEC standard. Special attention must be paid not to exceed junction
temperature TJ(max) at a given ambient temperate TA.
© 2010 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN5702 • Rev. 1.8 6
FAN5702 — Configurable 180 mA 6-LED Driver with I2C Control
Electrical Specifications
Unless otherwise specified: VIN = 2.7 V to 5.5 V; TA = -40C to +85C; and ENA, EN3, EN4, EN5, and EN6 = 1. Typical values are
VIN = 3.6 V, TA = 25C, ILED = 20 mA, and LED cathode terminals = 0.4 V. Circuit and components are according to Figure 1.
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Unit
Power Supplies and Thermal Protection
IQ
Quiescent Supply Current
1.5x Mode, No LEDs
4.4
mA
1x Mode, No LEDs
0.3
ISD
Shutdown Supply Current
EN = 0, VIN = 4.5V, TA = -40C to +85C
0.1
2.0
µA
VUVLO
Under-Voltage Lockout
Threshold
VIN Rising
2.55
2.70
V
VIN Falling
2.20
2.40
VUVHYST
Under-Voltage Lockout
Hysteresis
150
mV
TLIMIT
Thermal Shutdown
150
°C
THYST
Thermal Shutdown Hysteresis
20
°C
LED Current Sinks
ILED
Absolute Current Accuracy
VCATHODE = 0.4 V; see options for ISET
–10%
ISET
+10%
mA
ILED(MAX)
Maximum Diode Current(3)
ILED = ISET
30
mA
ILED_MATCH
LED Current Matching(4)
VCATHODE = 0.4 V, ILED = ISET
0.4
3.0
%
VDTH
1x to 1.5x Gain Transition
Threshold
LED Cathode Voltage Falling
100
mV
VHR
Current Sink Headroom(5)
ILED = 90% ILED(NOMINAL)
65
mV
PWM Dimming
fPWM
PWM Switching Frequency
tON_LED(MINIMUM) = 15 µs
20
kHz
DPWM
PWM Duty-Cycle
fPWM = 100 Hz
0.15
100.00
%
Charge Pump
ROUT
Output Resistance
1.5x Mode
2.4
Ω
1x Mode
0.9
fSW
Switching Frequency
0.9
1.2
1.5
MHz
tSTART
Startup Time
VOUT = 90% of VIN
250
µs
Logic Inputs (EN, SDA, SCL)
VIH
HIGH-Level Input Voltage
1.2
V
VIL
LOW-Level Input Voltage
0.4
V
VIMAX
Maximum Input Voltage
1.8
5.5
V
IIN
Input Bias Current
Input Tied to GND or VIN
0.01
1.00
µA
Notes:
3. The maximum total output current for the IC should be limited to 180 mA. The total output current can be split between the
two groups (IDxA = IDxB = 30 mA maximum). Under maximum output current conditions, special attention must be given
to input voltage and LED forward voltage to ensure proper current regulation. See the Maximum Output Current section of
the datasheet for more information.
4. For the two groups of current sinks on a part (group A and group B), the following are determined: the maximum sink
current in the group (MAX), the minimum sink current in the group (MIN), and the average sink current of the group (AVG).
For each group, two matching numbers are calculated: (MAX-AVG)/AVG and (AVG-MIN)/AVG. The largest number of the
two (worst case) is considered the matching value for the group. The matching value for a given part is considered to be
the highest matching value of the two groups. The typical specification provided is the most likely norm of the matching
value for all parts.
5. For each Dxx pin, headroom voltage is the voltage across the internal current sink connected to that pin. VHRx = VOUT -
VLED. If headroom voltage requirement is not met, LED current regulation is compromised.
© 2010 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN5702 • Rev. 1.8 7
FAN5702 — Configurable 180 mA 6-LED Driver with I2C Control
Typical Characteristics
VIN = 3.6 V, TA = 25C, ILED = 20 mA, and LED cathode terminals = 0.4 V.
Figure 4. Efficiency with LED Current of 8 mA and
20 mA
Figure 5. LED Current Match for all 6 LED
Channels at ILED=20 mA
Figure 6. LED Current Variation vs. Temperature
Figure 7. Shutdown Current vs. Input Voltage
Figure 8. Switching Frequency Over-Temperature
with LED Current at 20 mA
© 2010 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN5702 • Rev. 1.8 8
FAN5702 — Configurable 180 mA 6-LED Driver with I2C Control
Typical Characteristics
VIN = 3.6 V, TA = 25C, ILED = 20 mA, and LED cathode terminals = 0.4 V.
Figure 9. Mode Transition from 1x to 1.5x Mode
Using PWM Control (VCATHODE Ramp Up) at 2%
Duty Cycle
Figure 10. Mode Transition from 1.5x to 1x Mode
Using PWM Control (VCATHODE Ramp Down) at 2%
Duty Cycle
Figure 11. Line Transient Response in 1x Mode,
VIN=3.6 V – 4.2 V, ILEDx=20 mA
Figure 12. Line Transient Response in 1.5x Mode,
VIN=2.7 V – 3.3 V, ILED=20 mA
Figure 13. Line Transient from 1x to 1.5x Mode,
VIN=3.2 V – 4.1 V, ILEDx=20 mA
Figure 14. Soft-Start with SDA and SCL
© 2010 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN5702 • Rev. 1.8 9
FAN5702 — Configurable 180 mA 6-LED Driver with I2C Control
Typical Characteristics
Figure 15. Linear Dimming via I2C Interface,
VIN=3.6 V, ILEDx=20 mA, and tRAMP=6.4 ms
Figure 16. PWM Dimming, VIN=3.6 V, ILEDx=20 mA,
and EN=1 kHz with 20% Duty Cycle
Figure 17. PWM and Linear (via I2C) Dimming,
VIN=3.6 V, ILEDx=20 mA, and EN=1 kHz with 20%
Duty Cycle
© 2010 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN5702 • Rev. 1.8 10
FAN5702 — Configurable 180 mA 6-LED Driver with I2C Control
I2C Timing Specifications
Guaranteed by design.
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Unit
fSCL
SCL Clock Frequency
Standard Mode
100
kHz
Fast Mode
400
tBUF
Bus-Free Time between STOP and START Conditions
Standard mode
4.7
µs
Fast Mode
1.3
tHD;STA
START or Repeated START Hold Time
Standard Mode
4
µs
Fast Mode
600
ns
tLOW
SCL LOW Period
Standard Mode
4.7
µs
Fast Mode
1.3
ns
tHIGH
SCL HIGH Period
Standard Mode
4
µs
Fast Mode
600
ns
tSU;STA
Repeated START Setup Time
Standard Mode
4.7
µs
Fast Mode
600.0
ns
tSU;DAT
Data Setup Time
Standard Mode
250
ns
Fast Mode
100
ns
tHD;DAT
Data Hold Time
Standard Mode
0
3.45
µs
Fast Mode
0
900.00
ns
tRCL
SCL Rise Time
Standard Mode
20+0.1CB
1000
ns
Fast Mode
20+0.1CB
300
ns
tFCL
SCL Fall Time
Standard Mode
20+0.1CB
300
ns
Fast Mode
20+0.1CB
300
ns
tRDA
SDA Rise Time(6)
Standard Mode
20+0.1CB
1000
ns
Fast Mode
20+0.1CB
300
ns
tFDA
SDA Fall Time
Standard Mode
20+0.1CB
300
ns
Fast Mode
20+0.1CB
300
ns
tSU;STO
Stop Condition Setup Time
Standard Mode
4
µs
Fast Mode
600
ns
CB
Capacitive Load for SDA and SCL
400
pF
Note:
6. Rise time of SCL after a repeated START condition and after an ACK bit.
Timing Diagram
Figure 18. I2C Interface Timing for Fast and Slow Modes
START
REPEATED
START
SCL
SDA
tF
tHD;STA
tLOW
tR
tHD;DAT
tHIGH
TSU;DAT
tSU;STA
tHD;STO
tBUF
START STOP
tHD;STA
© 2010 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN5702 • Rev. 1.8 11
FAN5702 — Configurable 180 mA 6-LED Driver with I2C Control
Circuit Description
The FAN5702 is a white LED driver system based on an
adaptive 1.5x charge pump capable of supplying up to
180 mA of total output current. The tightly matched current
sinks ensure uniform brightness between the LEDs. Each
LED has a common anode configuration with its peak drive
current set during manufacturing (see Ordering Information
and ISET). An I2C-compatible interface is used to vary the
brightness within the individual current sinks as well as
configure the grouping. Each LED is controlled with 64
exponentially spaced analog brightness control levels
through I2C, as indicated in Table 1. For maximum flexibility,
the FAN5702 can be programmed with five independently
controlled LED banks; by default, arranged as 2,1,1,1,1 (first
two LEDs represent Group A). Through I2C, the device can
be reconfigured to add up to six LEDs to Group A as needed
by application requirements.
Charge Pump
The charge pump operates in either 1x mode, where VOUT is
connected to VIN through a bypass switch, or in 1.5x mode.
The circuit operates in 1x mode until the LED with the
highest forward voltage (VLED(MAX)) can no longer maintain
current regulation. At that point, 1.5x Mode begins. If the
lowest active cathode voltage is greater than 1.8 V, the
charge pump switches back to 1x Mode.
IC Enable
By default the General Purpose register bit 7 = 0, the EN pin
functions as enable/disable. When the EN pin is LOW, all
circuit functions, including I2C, are disabled and the registers
are set to their default values.
When the EN pin HIGH, I2C interface is enabled. The LEDs
can be turned on/off by writing to the General Purpose
register. The user can always communicate via I2C with the
device to change register settings regardless of whether any
LED is on or off.
PWM Dimming
By programming the General Purpose register bit 7 = 1, the
EN pin is reappropriated to a PWM dimming input. Applying
a PWM signal to this pin controls the LED current waveform
to be ON when the PWM dimming pin is HIGH and OFF
when the PWM dimming pin is LOW. By using this pin in
conjunction with the I2C register dimming, the part can
achieve higher dimming resolution. For instance, an 8-bit
PWM dimming signal applied along with the 6-bit register
dimming yields better than 14 bits of resolution
To change the PWM dimming pin back to the EN function,
set the General Purpose register bit 7 to 0.
Register Controlled Brightness
The DC value of the LED current is modulated according to
the values in Table 1. Current is expressed as a percentage
of the full scale current and is illustrated with a 20 mA ISET.
Table 1. Brightness Control
Dimming Code (Bx5-Bx0)
Current Level
ILED (mA) (ISET=20 mA)
000000
0.125%
0.025
000001
0.188%
0.038
000010
0.249%
0.050
000011
0.312%
0.063
000100
0.374%
0.075
000101
0.438%
0.088
000110
0.499%
0.100
000111
0.560%
0.113
001000
0.622%
0.125
001001
0.692%
0.138
001010
0.750%
0.150
001011
0.810%
0.163
001100
0.875%
0.175
001101
0.938%
0.188
001110
1.004%
0.200
001111
1.124%
0.225
010000
1.250%
0.250
010001
1.375%
0.275
010010
1.499%
0.300
010011
1.625%
0.325
010100
1.750%
0.350
010101
1.881%
0.375
010110
2.063%
0.413
010111
2.249%
0.450
011000
2.438%
0.488
011001
2.687%
0.538
011010
2.939%
0.588
011011
3.186%
0.638
011100
3.562%
0.713
011101
3.936%
0.788
011110
4.310%
0.863
011111
4.813%
0.963
100000
5.314%
1.063
100001
5.936%
1.188
100010
6.565%
1.313
100011
7.313%
1.463
100100
8.059%
1.613
100101
8.938%
1.788
100110
9.876%
1.975
100111
10.874%
2.175
101000
12.005%
2.400
101001
13.253%
2.650
101010
14.618%
2.925
101011
16.124%
3.225
101100
17.881%
3.575
101101
19.875%
3.975
101110
22.121%
4.425
101111
24.621%
4.925
110000
27.376%
5.475
110001
30.373%
6.075
110010
33.623%
6.725
110011
37.124%
7.425
110100
40.873%
8.175
110101
44.875%
8.975
110110
49.124%
9.825
110111
53.624%
10.725
111000
58.375%
11.675
111001
63.378%
12.675
111010
68.625%
13.725
111011
74.122%
14.825
111100
79.874%
15.975
111101
85.873%
17.175
111110
92.373%
18.475
111111
100.000%
20.000
© 2010 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN5702 • Rev. 1.8 12
FAN5702 — Configurable 180 mA 6-LED Driver with I2C Control
Brightness Ramp Control
When changing the group A brightness, the IC steps through
the brightness table at rate programmed by the RAMP
register, indicated in Table 2.
Table 2. Group A Brightness Ramp Control
RAMP[1:0]
Time per Step
Full-Scale Ramp Time
00
0.1 ms
6.4 ms
01
25 ms
1600 ms
10
50 ms
3200 ms
11
100 ms
6400 ms
VOUT Short-Circuit Protection
The FAN5702 has integrated protection circuitry to prevent
the device from being short circuited when the output voltage
falls below 2 V. If this occurs, FAN5702 turns off the charge
pump and the LED driver outputs, but a small bypass switch
is left on. The device monitors the output voltage to
determine if it is still in short circuit condition and, once it has
passed, soft-starts and returns to normal operation.
VOUT Over-Voltage Protection
If the output voltage goes above 6 V, the FAN5702 shuts
down until this condition has passed. The charge pump and
LED driver outputs are turned off. Once this condition has
passed, the FAN5702 soft-starts into normal operation.
I2C Interface
The FAN5702’s serial interface is compatible with standard
and fast I2C bus specifications. The FAN5702’s SCL line is
an input and its SDA line is a bi-directional open-drain
output, meaning that it can only pull down the bus when
active. The SDA line only pulls LOW during data reads and
when signaling ACK. All data is shifted in MSB (bit 7) first.
Slave Address
The FAN5702’s slave address is 6CH.
Table 3. I2C Slave Address
7
6
5
4
3
2
1
0
0
1
1
0
1
1
0
WR/
Register Addressing
The FAN5702 has six user-accessible registers.
Table 4. I2C Register Addresses
Default Value
Address
7
6
5
4
3
2
1
0
HEX
GENERAL
0
0
0
0
0
0
0
0
10
CONFIG
0
0
0
0
0
0
0
0
20
CHA
1
1
1
1
1
1
1
1
A0
CH3
1
1
1
1
1
1
1
1
30
CH4
1
1
1
1
1
1
1
1
40
CH5
1
1
1
1
1
1
1
1
50
CH6
1
1
1
1
1
1
1
1
60
Note:
7. Bold identifies bits that cannot be overwritten.
Bus Timing
As shown in Figure 19 data is normally transferred when
SCL is LOW. Data is clocked in to the FAN5702 on the rising
edge of SCL. Typically, data transitions shortly at or after the
falling edge of SCL to allow ample time for the data to set up
before the next SCL rising edge.
Figure 19. Data Transfer Timing
Each bus transaction begins and ends with SDA and SCL
HIGH. A transaction begins with a START condition, which is
defined as SDA transitioning from 1 to 0 with SCL HIGH, as
shown in Figure 20.
Figure 20. Start Bit
SCL TSU
TH
SDA
Data change allowed
SCL
THD;STA
SDA Slave Address
MS Bit
© 2010 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN5702 • Rev. 1.8 13
FAN5702 — Configurable 180 mA 6-LED Driver with I2C Control
A transaction ends with a STOP condition, which is defined
as SDA transitioning from 0 to 1 with SCL HIGH, as shown
in Figure 21.
Figure 21. Stop Bit
During a read from the FAN5702 (Figure 24, the master
issues a “Repeated Start” after sending the register address
and before resending the slave address. The “Repeated
Start” is a 1-to-0 transition on SDA while SCL is HIGH, as
shown in Figure 22.
Figure 22. Repeated Start Timing
Read and Write Transactions
The following figures outline the sequences for data read and write. Bus control is signified by the shading of the packet,
defined as and . All addresses and data are MSB first.
Table 5. I2C bit Definitions for Figure 23 and Figure 24.
Symbol
Definition
S
START. See Figure 20.
A
ACK. The slave drives SDA to 0 to acknowledge the preceding packet.
NACK. The slave sends a 1 to NACK the preceding packet.
R
Repeated START. See Figure 22
P
STOP. See Figure 21.
Figure 23. Write Transaction
Figure 24. Read Transaction
SCL
SDA
Slave Releases Master Drives
ACK(0) or
NACK(1)
tHD;STO
SCL
SDA ACK(0) or
NACK(1)
Slave Releases
SLADDR
MS Bit
tHD;STA
tSU;STA
Master Drives Bus
Slave Drives Bus
A
S Slave Address A Reg Addr A A P0
7 bits 8 bits 8 bits
Data
0 0 0
S Slave Address A Reg Addr A0
7 bits 8 bits
R Slave Address
7 bits
1 A Data A
8 bits
0 0 0 1
P
© 2010 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN5702 • Rev. 1.8 14
FAN5702 — Configurable 180 mA 6-LED Driver with I2C Control
Register Descriptions
The following tables define the operation of each register bit. Bold values are power-up defaults. These values apply only to
I2C version of the part.
Bit
Name
Default Value
Description
GENERAL Default: 00H General Purpose Register ADDR = 10H
7
PWM
0
Setting this bit=1 changes the EN pin to function as a PWM dimming input for
group A LEDs. This bit must be set to zero for the chip to be disabled.
6,5
FS1, FS2
00
00=20 mA (default), 01=30 mA, 10=15 mA, 11=8 mA when I2C is used.
4
EN6
0
Default=0 (Off), LED Channel Active=1
3
EN5
0
Default=0 (Off), LED Channel Active=1
2
EN4
0
Default=0 (Off), LED Channel Active=1
1
EN3
0
Default=0 (Off), LED Channel Active=1
0
ENA
0
Default=0 (Off), LED Channel Active=1
CONFIG Default: 00H Configuration Register ADDR = 20H
7
T56
0
Tie channel 5 and 6 together. Default=0 (Separate). Group 5&6 =1. Both
currents are set by CH5 register. T56 is overwritten by either S5A or S6A.
6
T34
0
Tie channel 3 and 4 together. Default=0 (Separate). Group 3&4 =1. Both
currents are set by the CH3 register. T34 is overwritten by either S3A or S4A.
5
S6A
0
CH6 group configuration. Independent=0 (default); part of group A=1.
4
S5A
0
CH5 group configuration. Independent=0 (default); part of group A=1.
3
S4A
0
CH4 group configuration. Independent=0 (default); part of group A=1.
2
S3A
0
CH3 group configuration. Independent=0 (default); part of group A=1.
1,0
RS1, RS0
00
Sets current ramp rate for group A channels
CHA Default: FFH Group A Brightness Control ADDR = A0H
7:6
Reserved
11
Vendor ID bits. These bits can be used to distinguish between vendors via I2C.
Writing to these bits does not change their value.
5:0
Brightness A
0 – 63
00 – 3FH
6-bit value that controls group A brightness per values in Table 1
CH3 Default: Channel 3 Brightness Control ADDR=30H
7:6
Reserved
11
Writing to these bits does not change their value.
5:0
Brightness 3
0 – 63
00 – 3FH
6-bit value that controls channel 3 brightness per values in Table 1
CH4 Default: FFH Channel 4 Brightness Control ADDR = 40H
7:6
Reserved
11
Writing to these bits does not change their value.
5:0
Brightness 4
0 – 63
00 – 3FH
6-bit value that controls channel 3 brightness per values in Table 1
CH5 Default: FFH Channel 5 Brightness Control ADDR = 50H
7:6
Reserved
11
Writing to these bits does not change their value.
5:0
Brightness 5
0 – 63
00 – 3FH
6-bit value that controls channel 3 brightness per values in Table 1
CH6 Default: FFH Channel 6 Brightness Control ADDR = 60H
7:6
Reserved
11
Writing to these bits does not change their value.
5:0
Brightness 6
0 – 63
00 – 3FH
6-bit value that controls channel 3 brightness per values in Table 1
The table below pertains to the Marketing Outline drawing on the following page…
Product-Specific Dimensions
Product
D
E
X
Y
FAN5702UCxx
1.610 mm
1.610 mm
0.205 mm
0.205 mm
1.75
1.75
0.50
3.00
3.00
0.30, 16X
0.75, 16X
TOP VIEW
BOTTOM VIEW
SIDE VIEW
LAND PATTERN RECOMMENDATION
NOTES:
A. DESIGN CONFORMS TO JEDEC MO-248
B. ALL DIMENSIONS ARE IN MILLIMETERS
C. LAND PATTERN RECOMMENDATION FROM
PCB MATRIX IPC LP CALCULATOR (V2009)
D. DRAWING FILENAME: MKT-UMLP16BrevB
0.10 C A B
0.05 C
3.00±0.10
3.00±0.10
PIN #1
IDENT
AB
0.025±0.025
0.50±0.05
0.15±0.05
SEATING PLANE
C
1.70±0.05
1.70±0.05
0.37±0.05 (16X)
0.50
0.25±0.05 (16X)
0.50
PIN #1
IDENT 14
5
8
9
12
13
16
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