TC7107ACLW - Microchip Technology



2002 Microchip Technology Inc. DS21455B-page 1

TC7106/A/TC7107/A

Features

• Internal Reference with Low Temperature Drift

- TC7106/7: 80ppm/°C Typical

- TC7106A/7A: 20ppm/°C Typical

• Drives LCD (TC7106) or LED (TC7107)

Display Directly

• Zero Reading with Zero Input

• Low Noise for Stable Display

• Auto-Zero Cycle Eliminates Need for Zero

Adjustment

• True Polarity Indication for Precision Null

Applications

• Convenient 9V Battery Operation (TC7106A)

• High Impedance CMOS Differential Inputs: 1012Ω

• Differential Reference Inputs Simplify Ratiometric

Measurements

• Low Power Operation: 10mW

Applications

• Thermometry

• Bridge Readouts: Strain Gauges, Load Cells, Null

Detectors

• Digital Meters: Voltage/Current/Ohms/Power, pH

• Digital Scales, Process Monitors

• Portable Instrumentation

Device Selection Table

General Description

The TC7106A and TC7107A 3-1/2 digit direct display

drive analog-to-digital converters allow existing 7106/

7107 based systems to be upgraded. Each device has

a precision reference with a 20ppm/°C max tempera-

ture coefficient. This representsa 4 to7 times improve-

ment over similar 3-1/2 digit converters. Existing 7106

and 7107 based systems may be upgraded without

changing external passive component values. The

TC7107A drives common anode light emitting diode

(LED) displays directly with 8mA per segment. A low

cost, high resolution indicating meter requires only a

display, four resistors, and four capacitors.The

TC7106A low power drain and 9V battery operation

make it suitable for portable applications.

The TC7106A/TC7107A reduces linearity error to less

than 1 count. Rollover error –the difference in readings

for equal magnitude,but opposite polarity input signals,

is below ±1 count. High impedance differential inputs

offer 1pA leakage current and a 1012Ωinput imped-

ance. The differential reference input allows ratiometric

measurements for ohms or bridge transducer mea-

surements. The 15µVP–P noise performance ensures a

“rock solid” reading. The auto-zero cycle ensures a

zero display reading with a zero volts input.

Package

Code Package Pin Layout Temperature

Range

CPI 40-Pin PDIP Normal 0°Cto+70°C

IPL 40-Pin PDIP Normal -25°Cto+85°C

IJL 40-Pin CERDIP Normal -25°Cto+85°C

CKW 44-PinPQFP Formed Leads 0°Cto+70°C

CLW 44-Pin PLCC — 0°Cto+70°C

3-1/2 Digit Analog-to-Digital Converters

TC7106/A/TC7107/A

DS21455B-page 2

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2002 Microchip Technology Inc.

Package Type

TC7106ACPL

TC7107AIPL

44-Pin PLCC 44-Pin PQFP

40-Pin CERDIP40-Pin PDIP

OSC1

TEST

REF

ANALOG

COMMON

V+

Normal Pin

Configuration

(Minus Sign) (Minus Sign)

10's

100's

1000's

(7106A/7107A)

100's

OSC2

OSC3

REF

BUFF

INT

V-

BP/GND

POL

TC7106AIJL

TC7107AIJL

100's

1000's

100's

Reverse

Configuration

1's

V+

POL

1's

10's

OSC1

TEST

REF

ANALOG

COMMON

OSC2

OSC3

REF

BUFF

INT

V-

BP/GND

(7106A/7107A)

TEST

OSC3

OSC2

OSC1

V+

12 13 14 15 16 17 18 19 20 21 22

38 37 36 35 34

REF HI

TC7106ACKW

TC7107ACKW

394041424344

REF LO

REF

COM

IN HI

IN LO

A/Z

BUFF

INT

V-

BP/GN

POL

REF LO

REF

18 19 20 21 22 23 24 25 26 27 28

44 43 42 41 40

TC7106ACLW

TC7107ACLW

123456

V+

OSC1

OSC2

OSC3

TEST

REF HI

POL

BP/GND

REF

COMMON

IN HI

IN LO

A/Z

BUFF

INT

V-

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2002 Microchip Technology Inc. DS21455B-page 3

TC7106/A/TC7107/A

Typical Application

VREF+

TC7106/A

TC7107/A

VREF

24kΩ

1kΩ

39 38 40

0.47µF

0.1µF

V-

OSC1OSC3OSC2 To Analog

Common (Pin 32)

3 Conversions/Sec

200mV Full Scale

COSC

100kΩ

47kΩ

0.22µF

CREF-CREF+

VIN+

VIN-

ANALOG

COMMON

VINT

VBUFF

CAZ

Segment

Drive

2 - 19

22 - 25

POL

V+

Minus Sign Backplane

Drive

ROSC 100pF

LCD Display (TC7106/A) o

Common Node w/ LED

Display (TC7107/A)

100mV

VREF-

0.01µF

Analog

Input

–

1MΩ

TC7106/A/TC7107/A

DS21455B-page 4

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2002 Microchip Technology Inc.

1.0 ELECTRICAL

CHARACTERISTICS

Absolute Maximum Ratings*

TC7106A

Supply Voltage (V+ to V-).......................................15V

Analog Input Voltage (either Input) (Note 1) ... V+ to V-

Reference Input Voltage (either Input)............ V+ to V-

Clock Input ...................................................Test to V+

Package Power Dissipation (TA≤70°C) (Note 2):

40-Pin CERDIP .......................................2.29W

40-Pin PDIP ............................................1.23W

44-Pin PLCC ...........................................1.23W

44-Pin PQFP ...........................................1.00W

Operating Temperature Range:

C (Commercial) Devices ..............0°C to +70°C

I (Industrial) Devices ................-25°C to +85°C

Storage Temperature Range..............-65°C to +150°C

TC7107A

Supply Voltage (V+) ...............................................+6V

Supply Voltage (V-)..................................................-9V

Analog Input Voltage (either Input) (Note 1) ... V+ to V-

Reference Input Voltage (either Input)............ V+ to V-

Clock Input ..................................................GND to V+

Package Power Dissipation (TA≤70°C) (Note 2):

40-Pin CERDip........................................2.29W

40-Pin PDIP ............................................1.23W

44-Pin PLCC ...........................................1.23W

44-Pin PQFP ...........................................1.00W

Operating Temperature Range:

C (Commercial) Devices ..............0°C to +70°C

I (Industrial) Devices ................-25°C to +85°C

Storage Temperature Range..............-65°C to +150°C

*Stresses above those listed under "Absolute Maximum

Ratings" may cause permanent damage to the device. These

are stress ratings only and functional operation of the device

at these or any other conditions above those indicated in the

operation sections of the specifications is not implied.

Exposure to Absolute Maximum Rating conditions for

extended periods may affect device reliability.

TC7106/A AND TC7107/A ELECTRICAL SPECIFICATIONS

Electrical Characteristics: Unless otherwise noted, specifications apply to both the TC7106/A and TC7107/A at TA=25°C,

fCLOCK = 48kHz. Parts are tested in the circuit of the Typical Operating Circuit.

Symbol Parameter Min Typ Max Unit Test Conditions

ZIR Zero Input Reading -000.0 ±000.0 +000.0 Digital

Reading VIN =0.0V

Full Scale = 200.0mV

Ratiometric Reading 999 999/1000 1000 Digital

Reading VIN =V

REF

VREF =100mV

R/O Rollover Error (Difference in Reading for

Equal Positive and Negative

Reading Near Full Scale)

-1 ±0.2 +1 Counts VIN-=+V

IN+ ≅ 200mV

Linearity (Max. Deviation from Best

Straight Line Fit) -1 ±0.2 +1 Counts Full Scale = 200mV or

Full Scale = 2.000V

Note 1: Input voltages may exceed the supply voltages, provided the input current is limited to ±100µA.

2: Dissipation rating assumes device is mounted with all leads soldered to printed circuit board.

3: Refer to “Differential Input” discussion.

4: Backplane drive is in phase with segment drive for “OFF” segment, 180° out of phase for “ON” segment.

Frequency is 20 times conversion rate. Average DC component is less than 50mV.

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2002 Microchip Technology Inc. DS21455B-page 5

TC7106/A/TC7107/A

CMRR Common Mode Rejection Ratio (Note 3) —50—µV/V VCM =±1V,V

IN =0V,

Full Scale = 200.0mV

eNNoise (Peak to Peak Value not Exceeded

95% of Time) —15—µVV

IN =0V

Full Scale - 200.0mV

ILLeakage Current at Input — 1 10 pA VIN =0V

Zero Reading Drift — 0.2 1 µV/°C VIN =0V

“C” Device = 0°C to +70°C

—1.02µV/°C VIN =0V

“I” Device = -25°C to +85°C

TCSF Scale Factor Temperature Coefficient — 1 5 ppm/°C VIN =199.0mV,

“C” Device = 0°C to +70°C

(Ext. Ref = 0ppm°C)

——20ppm/°CV

IN =199.0mV

“I” Device = -25°C to +85°C

IDD Supply Current (Does not include LED

Current For TC7107/A) —0.81.8mAV

IN =0.8

VCAnalog Common Voltage

(with Respect to Positive Supply) 2.7 3.05 3.35 V 25kΩBetweenCommonand

Positive Supply

VCTC Temperature Coefficient of Analog

Common (with Respect to Positive Supply) ————25kΩBetweenCommonand

Positive Supply

7106/7/A

7106/7 20

80 50

—ppm/°C

ppm/°C 0°C ≤TA≤+70°C

(“C” Commercial Temperature

Range Devices)

VCTC Temperature Coefficient of Analog

Common (with Respect to Positive Supply) — — 75 ppm/°C 0°C ≤TA≤+70°C

(“I” Industrial Temperature

Range Devices)

VSD TC7106A ONLY Peak to Peak

Segment Drive Voltage 456VV+toV-=9V

(Note 4)

VBD TC7106A ONLY Peak to Peak

Backplane Drive Voltage 456VV+toV-=9V

(Note 4)

TC7107A ONLY

Segment Sinking Current (Except Pin 19) 58.0—mAV+=5.0V

Segment Voltage = 3V

TC7107A ONLY

Segment Sinking Current (Pin 19) 10 16 — mA V+ = 5.0V

Segment Voltage = 3V

TC7106/A AND TC7107/A ELECTRICAL SPECIFICATIONS (CONTINUED)

Electrical Characteristics: Unless otherwise noted, specifications apply to both the TC7106/A and TC7107/A at TA=25°C,

fCLOCK = 48kHz. Parts are tested in the circuit of the Typical Operating Circuit.

Symbol Parameter Min Typ Max Unit Test Conditions

Note 1: Input voltages may exceed the supply voltages, provided the input current is limited to ±100µA.

2: Dissipation rating assumes device is mounted with all leads soldered to printed circuit board.

3: Refer to “Differential Input” discussion.

4: Backplane drive is in phase with segment drive for “OFF” segment, 180° out of phase for “ON” segment.

Frequency is 20 times conversion rate. Average DC component is less than 50mV.

TC7106/A/TC7107/A

DS21455B-page 6

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2002 Microchip Technology Inc.

2.0 PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 2-1.

TABLE 2-1: PIN FUNCTION TABLE

Pin Number

(40-Pin PDIP)

Normal

Pin No.

(40-Pin PDIP)

(Reversed Symbol Description

1 (40) V+ Positive supply voltage.

2(39)D

1Activates the D section of the units display.

3(38)C

1Activates the C section of the units display.

4(37)B

1Activates the B section of the units display.

5(36)A

1Activates the A section of the units display.

6(35)F

1Activates the F section of the units display.

7(34)G

1Activates the G section of the units display.

8(33)E

1Activates the E section of the units display.

9(32)D

2Activates the D section of the tens display.

10 (31) C2Activates the C section of the tens display.

11 (30) B2Activates the B section of the tens display.

12 (29) A2Activates the A section of the tens display.

13 (28) F2Activates the F section of the tens display.

14 (27) E2Activates the E section of the tens display.

15 (26) D3Activates the D section of the hundreds display.

16 (25) B3Activates the B section of the hundreds display.

17 (24) F3Activates the F section of the hundreds display.

18 (23) E3Activates the E section of the hundreds display.

19 (22) AB4Activates both halves of the 1 in the thousands display.

20 (21) POL Activates the negative polarity display.

21 (20) BP/GND LCD Backplane drive output (TC7106A). Digital Ground (TC7107A).

22 (19) G3Activates the G section of the hundreds display.

23 (18) A3Activates the A section of the hundreds display.

24 (17) C3Activates the C section of the hundreds display.

25 (16) G2Activates the G section of the tens display.

26 (15) V- Negative power supply voltage.

27 (14) VINT Integrator output. Connection point for integration capacitor. See INTEGRATING

CAPACITOR section for more details.

28 (13) VBUFF Integration resistor connection. Use a 47kΩresistor for a 200mV full scale range and

a47kΩresistor for 2V full scale range.

29 (12) CAZ The size of the auto-zero capacitor influences system noise. Use a 0.47µF capacitor

for 200mV full scale, and a 0.047µF capacitor for 2V full scale. See Section 7.1 on

Auto-Zero Capacitor for more details.

30 (11) VIN- The analog LOW input is connected to this pin.

31 (10) VIN+ The analog HIGH input signal is connected to this pin.

32 (9) ANALOG

COMMON This pin is primarily used to set the Analog Common mode voltage for battery opera-

tion or in systems where the input signal is referenced to the power supply. It also

acts as a reference voltage source.See Section 8.3 on ANALOG COMMONformore

details.

33 (8) CREF- See Pin 34.

34 (7) CREF+A0.1µF capacitor is used in most applications. If a large Common mode voltage

exists (for example, the VIN- pin is not at analog common), and a 200mV scale is

used, a 1µF capacitor is recommended and will hold the rollover error to 0.5 count.

35 (6) VREF- See Pin 36.

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2002 Microchip Technology Inc. DS21455B-page 7

TC7106/A/TC7107/A

36 (5) VREF+ The analog inputrequired to generate a full scale output (1999counts). Place 100mV

between Pins 35 and 36 for 199.9mV full scale. Place 1V between Pins 35 and 36 for

2V full scale. See paragraph on Reference Voltage.

37 (4) TEST Lamp test. When pulled HIGH (to V+) all segments will be turned on and the display

should read -1888. It may also be used as a negative supply for externally generated

decimal points. See paragraph under TEST for additional information.

38 (3) OSC3 See Pin 40.

39 (2) OSC2 See Pin 40.

40 (1) OSC1 Pins 40, 39, 38 make up the oscillator section. For a 48kHz clock (3 readings per

section), connect Pin 40 to the junction of a 100kΩresistor and a 100pF capacitor.

The 100kΩresistor is tied to Pin 39 and the 100pF capacitor is tied to Pin 38.

TABLE 2-1: PIN FUNCTION TABLE (CONTINUED)

Pin Number

(40-Pin PDIP)

Normal

Pin No.

(40-Pin PDIP)

(Reversed Symbol Description

TC7106/A/TC7107/A

DS21455B-page 8

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2002 Microchip Technology Inc.

3.0 DETAILED DESCRIPTION

(All Pin designations refer to 40-Pin PDIP.)

3.1 Dual Slope Conversion Principles

The TC7106Aand TC7107A are dual slope, integrating

analog-to-digital converters. An understanding of the

dual slope conversion technique will aid in following the

detailed operation theory.

The conventional dual slope converter measurement

cycle has two distinct phases:

• Input Signal Integration

• Reference Voltage Integration (De-integration)

The input signal being converted is integrated for a

fixed time period (TSI). Time is measured by counting

clock pulses. An opposite polarity constant reference

voltage is then integrated until the integrator output

voltage returns to zero. The reference integration time

is directly proportional to the input signal (TRI). See

Figure 3-1.

FIGURE 3-1: BASIC DUAL SLOPE

CONVERTER

In a simple dual slope converter, a complete conver-

sion requires the integrator output to “ramp-up” and

“ramp-down.” A simple mathematical equation relates

the input signal, reference voltage and integration time.

EQUATION 3-1:

For a constant VIN:

EQUATION 3-2:

The dual slope converter accuracy is unrelated to the

integrating resistor and capacitor values as long as

they are stable during a measurement cycle. An inher-

ent benefit is noise immunity. Noise spikes are inte-

grated or averaged to zero during the integration

periods. Integrating ADCs are immune to the large con-

version errors that plague successive approximation

converters in high noise environments. Interfering sig-

nals with frequency components at multiples of the

averaging period will be attenuated. Integrating ADCs

commonly operate with the signalintegration period set

to a multiple of the 50/60Hz power line period (see

Figure 3-2).

FIGURE 3-2: NORMAL MODE

REJECTION OF DUAL

SLOPE CONVERTER

–

REF

Voltage

Analog

Input

Signal

–

DISPLAY

Switch

Driver

Control

Logic

Integrator

Output

Clock

Counter

Polarity Control

Phase

Control

VIN ≈ VREF

VIN ≈ 1/2 VREF

Variable

Reference

Integrate

Time

Fixed

Signal

Integrate

Time

Integrator

Comparator

+/–

RC VRTRI

TSI

0VIN(t)dt =

∫

Where:

VR= Reference voltage

TSI = Signal integration time (fixed)

TRI = Reference voltageintegration time (variable).

VIN =V

RTRI

TSI

Normal Mode Rejection (dB)

0.1/T 1/T 10/T

Input Fre

uenc

T = Measured Period

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2002 Microchip Technology Inc. DS21455B-page 9

TC7106/A/TC7107/A

4.0 ANALOG SECTION

In addition to the basic signal integrate and de-

integrate cycles discussed, the circuit incorporates an

auto-zero cycle. This cycle removes buffer amplifier,

integrator, and comparator offset voltage error terms

from the conversion. A true digital zero reading results

without adjusting external potentiometers. A complete

conversion consists of three cycles: an auto-zero,

signal integrate and reference integrate cycle.

4.1 Auto-Zero Cycle

During the auto-zero cycle, the differential input signal

is disconnected from the circuit by opening internal

analog gates. The internal nodes are shorted to analog

common (ground) to establish a zero input condition.

Additional analog gates close a feedback loop around

the integrator and comparator. This loop permits com-

parator offset voltage error compensation. The voltage

level established on CAZ compensates for device offset

voltages. The offset error referred to the input is less

than 10µV.

The auto-zero cycle length is 1000 to 3000 counts.

4.2 Signal Integrate Cycle

The auto-zero loop is entered and the internal differen-

tial inputs connect to VIN+ and VIN-. The differential

input signal is integrated for a fixed time period. The

TC7136/A signal integration period is 1000 clock peri-

ods or counts. The externally set clock frequency is

divided by four before clocking the internal counters.

The integration time period is:

EQUATION 4-1:

The differential input voltage must be within the device

Common mode range when the converter and mea-

sured system share the same power supply common

(ground). If the converter and measured system do not

share the same power supply common, VIN-should be

tied to analog common.

Polarity is determined at the end of signal integrate

phase. The sign bit is a true polarity indication, in that

signals less than 1LSB are correctly determined. This

allows precision null detection limited only by device

noise and auto-zero residual offsets.

4.3 Reference Integrate Phase

The third phase is reference integrate or de-integrate.

VIN- is internally connected to analog common and

VIN+ is connected across the previously charged refer-

ence capacitor. Circuitry within the chip ensures that

the capacitor will be connected with the correct polarity

to cause the integrator output to return to zero.

The time required forthe output to return to zero is pro-

portional to the input signal and is between 0 and 2000

counts.

The digital reading displayed is:

EQUATION 4-2:

5.0 DIGITAL SECTION (TC7106A)

The TC7106A (Figure 5-2) contains all the segment

drivers necessary to directly drive a 3-1/2 digit liquid

crystal display (LCD). An LCD backplane driver is

included. The backplane frequency is the external

clock frequency divided by 800. For three conversions/

second, the backplane frequency is 60Hz with a 5V

nominal amplitude. When a segment driver is in phase

with the backplane signal, the segment is “OFF.” An

out of phase segment drive signal causes the segment

to be “ON” or visible. This AC drive configuration

results in negligible DC voltage across each LCD seg-

ment. This insures long LCD display life. The polarity

segment driver is “ON” for negative analog inputs. If

VIN+andV

IN-are reversed, this indicator will reverse.

When the TEST pin on the TC7106A is pulled to V+, all

segments are turned “ON.” The display reads -1888.

During this mode, the LCD segments have a constant

DC voltage impressed. DO NOT LEAVE THE DIS-

PLAY IN THIS MODE FOR MORE THAN SEVERAL

MINUTES! LCD displays may be destroyed if operated

with DC levels for extended periods.

The display font and the segment drive assignment are

showninFigure5-1.

FIGURE 5-1: DISPLAY FONT AND

SEGMENT ASSIGNMENT

In the TC7106A, an internal digital ground is generated

from a 6-volt zener diode and a large P channel source

follower. This supply is made stiff to absorb the large

capacitive currents when the backplane voltage is

switched.

TSI =4

FOSC x 1000

Where: FOSC = external clock frequency.

1000 = VIN

VREF

Display Font

1000's 100's 10's 1's

TC7106/A/TC7107/A

DS21455B-page 10



2002 Microchip Technology Inc.

FIGURE 5-2: TC7106A BLOCK DIAGRAM

TC7106A

Thousands Hundreds Tens Units

÷4

OSC2

V+

TES

To Switch Drivers

From Comparator Output

Clock

40 38

OSC3OSC1

Control Logic

500Ω

Data Latch

CREF-

RINT

V+

CAZ

VINT

28 29 27333634

µA

A/Z

INT

AZ & DE (±)

INT 26

Integrator

Digital

Section

DE (+)

(–)DE

(+)

DE (–)

ANALOG

COMMON

CREF+

VIN+

VIN-

VBUFF

CINT

VREF+V

REF-

A/Z

CREF

–

LCD Segment Drivers

÷ 200

Backplane

FOSC

V-

VTH = 1V

V-

–

Internal Digital Ground

Low

Tempco

VREF

Comparator

–

A/Z

V+ – 3.0V

ROSC COSC

7 Segment

Decode

7 Segment

Decode

7 Segment

Decode

Typical Segment Output

Segment

Output

V+

0.5mA

2mA

6.2V

LCD Display

–

A/Z

Internal Digital Ground



2002 Microchip Technology Inc. DS21455B-page 11

TC7106/A/TC7107/A

6.0 DIGITAL SECTION (TC7107A)

Figure 6-2 shows a TC7107A block diagram. It is

designed to drive common anode LEDs. It is identical

to the TC7106A, except that the regulated supply and

backplane drive have been eliminated and the segment

drive is typically 8mA. The 1000's output (Pin 19) sinks

current from two LED segments, and has a 16mA drive

capability.

In both devices, the polarity indication is “ON” for neg-

ative analog inputs. If VIN- and VIN+ are reversed, this

indication can be reversed also, if desired.

The display font is the same as the TC7106A.

6.1 System Timing

The oscillator frequency is divided by 4 prior to clocking

the internal decade counters. The four-phase mea-

surement cycle takes a total of 4000 counts, or 16,000

clock pulses. The 4000-count cycle is independent of

input signal magnitude.

Each phase of the measurement cycle has the follow-

ing length:

1. Auto-zero phase: 1000 to 3000 counts (4000 to

12000 clock pulses).

For signals less than full scale, the auto-zero phase is

assigned the unused reference integrate time period:

2. Signal integrate: 1000 counts (4000 clock

pulses).

This time period is fixed. The integration period is:

EQUATION 6-1:

3. Reference Integrate: 0 to 2000 counts (0 to 8000

clock pulses).

The TC7106A/7107A are drop-in replacements for the

7106/7107 parts. External component value changes

are not required to benefit from the low drift internal

reference.

6.2 Clock Circuit

Three clocking methods may be used (seeFigure 6-1):

1. An external oscillator connected to Pin 40.

2. A crystal between Pins 39 and 40.

3. An RC oscillator using all three pins.

FIGURE 6-1: CLOCK CIRCUITS

TSI = 4000 1

FOSC







Where: FOSC is the externally set clock frequency.

TC7106A

TC7107A

Crystal

RC Network

40 38

EXT

OSC

To TEST Pin on TSC7106A

To GND Pin on TSC7107A

Counter

TC7106/A/TC7107/A

DS21455B-page 12



2002 Microchip Technology Inc.

FIGURE 6-2: TC7107A BLOCK DIAGRAM

TC7107A

Thousands Hundreds Tens Units

÷4

OSC2

V+

To Switch Drivers

from Comparator Output

Clock

7 Segment

Decode

40 38

OSC3OSC1

Logic Control

Data Latch

REF

INT

V+

INT

28 29 27333634

µA

A/Z

INT

AZ & DE (±)

INT 26

Integrator

Digital

Section

DE (+)

(–)DE

(+)

DE (–)

ANALOG

COMMON

REF

BUFF

INT

REF

A/Z

REF

–

LCD Segment Drivers

OSC

V-

–

Digital Ground

Low

Tempco

REF

Comparator

–

A/Z

V+ – 3.0V

OSC

7 Segment

Decode

7 Segment

Decode

Typical Segment Output

Internal Digital Ground

Segment

Output

V+

0.5mA

8mA Led Display

–

A/Z

Digital

Ground

TEST

500Ω



2002 Microchip Technology Inc. DS21455B-page 13

TC7106/A/TC7107/A

7.0 COMPONENT VALUE

SELECTION

7.1 Auto-Zero Capacitor (CAZ)

The CAZ capacitor size has some influence on system

noise. A 0.47µF capacitor is recommended for 200mV

full scale applications where 1LSB is 100µV. A 0.047µF

capacitor is adequate for 2.0V full scale applications. A

mylar type dielectric capacitor is adequate.

7.2 Reference Voltage Capacitor

(CREF)

The reference voltage used to ramp the integrator out-

put voltage back to zero during the reference integrate

cycleisstoredonC

REF.A0.1µF capacitor is acceptable

when VIN- istied to analog common.If a large Common

mode voltage exists (VREF- – analog common) and the

application requires 200mV full scale, increase CREF to

1.0µF. Rollover error will be held to less than 1/2 count.

A mylar dielectric capacitor is adequate.

7.3 Integrating Capacitor (CINT)

CINT should be selected to maximize the integrator out-

put voltage swing without causing output saturation.

Due to the TC7106A/7107A superior temperature coef-

ficient specification, analog common will normally sup-

ply the differential voltage reference. For this case, a

±2V full scale integrator output swing is satisfactory.

For 3 readings/second (FOSC =48kHz),a0.22µF value

is suggested. If a different oscillator frequency is used,

CINT must be changed in inverse proportion to maintain

the nominal ±2V integrator swing.

An exact expression for CINT is:

EQUATION 7-1:

CINT must have low dielectric absorption to minimize

rollover error. A polypropylene capacitor is recom-

mended.

7.4 Integrating Resistor (RINT)

The input buffer amplifier and integrator are designed

with class A output stages. The output stage idling cur-

rent is 100µA. The integrator and buffer can supply

20µA drive currents with negligible linearity errors.

RINT is chosen to remain in the output stage linear drive

region, but not so large that printed circuit board leak-

age currents induce errors. For a 200mV full scale,

RINT is 47kΩ. 2.0V full scale requires 470kΩ.

Note: FOSC = 48kHz (3 readings per sec).

7.5 Oscillator Components

ROSC (Pin 40 to Pin 39) should be 100kΩ.C

OSC is

selected using the equation:

EQUATION 7-2:

For FOSC of 48kHz, COSC is 100pF nominally.

Note that FOSC is divided by four to generate the

TC7106A internal control clock. The backplane drive

signal is derived by dividing FOSC by 800.

To achieve maximum rejection of 60Hz noise pickup,

the signal integrate period should be a multiple of

60Hz. Oscillator frequencies of 240kHz, 120kHz,

80kHz, 60kHz, 48kHz, 40kHz, etc. should be selected.

For 50Hz rejection, oscillator frequencies of 200kHz,

100kHz, 66-2/3kHz, 50kHz, 40kHz, etc. would be suit-

able. Note that 40kHz (2.5 readings/second) will reject

both 50Hz and 60Hz.

7.6 Reference Voltage Selection

A full scale reading (2000 counts) requires the input

signal be twice the reference voltage.

FS =2V

REF.

In some applications, a scale factor other than unity

may exist between a transducer output voltage and the

required digital reading. Assume, for example, a pres-

sure transducer output is 400mV for 2000 lb/in2.

Rather than dividing the input voltage by two, the refer-

ence voltage should be set to 200mV. This permits the

transducer input to be used directly.

CINT =

(4000)

VINT

FOSC

VFS

RINT











Where:

FOSC= Clock Frequency at Pin 38

VFS = Full Scale Input Voltage

RINT = Integrating Resistor

VINT = Desired Full Scale Integrator Output Swing

Component

Value

Nominal Full Scale Voltage

200.0mV 2.000V

CAZ 0.47µF 0.047µF

RINT 47kΩ470kΩ

CINT 0.22µF0.22µF

Required Full Scale Voltage* VREF

200.0mV 100.0mV

2.000V 1.000V

FOSC =0.45

TC7106/A/TC7107/A

DS21455B-page 14



2002 Microchip Technology Inc.

Thedifferentialreferencecanalsobeusedwhenadig-

ital zero reading is required when VIN is not equal to

zero. This is common in temperature measuring instru-

mentation. A compensating offset voltage can be

applied between analog common and VIN-. The trans-

ducer output is connected between VIN+ and analog

common.

The internal voltage reference potential available at

analog common will normally be used to supply the

converter's reference. This potential is stable when-

ever the supply potential is greater than approximately

7V. In applications where an externally generated ref-

erence voltage is desired, refer to Figure 7-1.

FIGURE 7-1: EXTERNAL REFERENCE

8.0 DEVICE PIN FUNCTIONAL

DESCRIPTION

8.1 Differential Signal Inputs

VIN+(Pin31),V

IN-(Pin30)

The TC7106A/7017A is designed with true differential

inputs and accepts input signals within the input stage

common mode voltage range (VCM). The typical range

is V+ – 1.0 to V+ + 1V. Common mode voltages are

removed from the system when the TC7106A/

TC7107A operates from a battery or floating power

source (isolated from measured system) and VIN-is

connected to analog common (VCOM) (see Figure 8-2).

In systems where Common mode voltages exist, the

86dB Common mode rejection ratio minimizes error.

Common mode voltages do, however, affect the inte-

grator output level. Integrator output saturation must be

prevented. A worst case condition exists if a large pos-

itive VCM exists in conjunction with a full scale negative

differential signal. The negative signal drives the inte-

grator output positive along with VCM (see Figure 8-1).

For such applications the integrator output swing can

be reduced below the recommended 2.0V full scale

swing. The integrator output will swing within 0.3V of

V+ or V- without increasing linearity errors.

FIGURE 8-1: COMMON MODE

VOLTAGE REDUCES

AVAILABLEINTEGRATOR

SWING (VCOM ≠ VIN)

8.2 Differential Reference

VREF+(Pin36),V

REF-(Pin35)

The reference voltage can be generated anywhere

within the V+ to V- power supply range.

To prevent rollover type errors being induced by large

Common mode voltages, CREF should be large com-

pared to stray node capacitance.

The TC7106A/TC7107A circuits have a significantly

lower analog common temperature coefficient. This

gives a very stable voltage suitable for use as a refer-

ence. The temperature coefficient of analog common is

20ppm/°C typically.

8.3 AnalogCommon(Pin32)

The analog common pin is set at a voltage potential

approximately 3.0V below V+. The potential is between

2.7V and 3.35V below V+. Analog common is tied inter-

nally to the N channel FET capable of sinking 20mA.

This FET will hold the common line at 3.0V should an

external load attempt to pull the common line toward

V+. Analog common source current is limited to 10µA.

Analog common is, therefore, easily pulled to a more

negative voltage (i.e., below V+ – 3.0V).

The TC7106A connects the internal VIN+andV

IN-

inputs to analog common during the auto-zero cycle.

During the reference integrate phase, VIN- is con-

nected to analog common. If VIN- is not externally con-

nected to analog common, a Common mode voltage

exists. This is rejected by the converter's 86dB Com-

mon mode rejection ratio. In battery operation, analog

common and VIN- are usually connected, removing

Common mode voltage concerns. In systems where V-

is connected to the power supply ground, or to a given

voltage, analog common should be connected to VIN-.

TC7106A

TC7107A

6.8V

Zener

V+

1.2V

Ref

Common

TC7106A

TC7107A

6.8kΩ

20kΩ

REF

(

)(

)

V+

–

Integrator

[

– V

Input Buffer

= Integration Capacitor

= Integration Resistor

4000

OSC

= Integration Time =

Where:

–



2002 Microchip Technology Inc. DS21455B-page 15

TC7106/A/TC7107/A

FIGURE 8-2: COMMON MODE VOLTAGE REMOVED IN BATTERY OPERATION WITH

VIN-= ANALOG COMMON

The analog common pin serves tosettheanalogsection

reference or common point. The TC7106A is specifically

designed to operate from a battery, or in any measure-

ment system where input signals are not referenced

(float), with respect to the TC7106A power source. The

analog common potential of V+ – 3.0V gives a 6V end of

batterylife voltage. The common potential has a 0.001%

voltage coefficient and a 15Ωoutput impedance.

With sufficiently high total supply voltage (V+ – V- >

7.0V), analog common is a very stable potential with

excellent temperature stability, typically 20ppm/°C.

This potential can be used to generate the reference

voltage. An external voltage reference will be unneces-

sary in mostcases because of the 50ppm/°C maximum

temperature coefficient. See Internal Voltage Refer-

ence discussion.

8.4 TEST (Pin 37)

The TEST pin potential is 5V less than V+. TEST may

be used as the negative power supply connection for

external CMOS logic. The TEST pin is tied to the inter-

nally generated negative logic supply (Internal Logic

Ground) through a 500Ωresistor in the TC7106A. The

TEST pin load should be no more than 1mA.

If TEST is pulled to V+ allsegments plus the minus sign

will be activated. Do not operate in this mode for more

than several minutes with the TC7106A. With

TEST = V+, the LCD segments are impressed with a

DC voltage which will destroy the LCD.

The TEST pin will sink about 10mA when pulled to V+.

8.5 Internal Voltage Reference

The analog common voltage temperature stability has

been significantly improved (Figure 8-3). The “A” ver-

sion of the industry standard circuits allow users to

upgrade old systems and design new systems without

external voltage references. External R and C values

do not need to be changed. Figure 8-4 shows analog

common supplying the necessary voltage reference for

the TC7106A/TC7107A.

FIGURE 8-3: ANALOG COMMON

TEMPERATURE

COEFFICIENT

FIGURE 8-4: INTERNAL VOLTAGE

REFERENCE

CONNECTION

BUF

INT

BPPOL

Segment

Drive

OSC1

OSC3

OSC2

V-V+

REF

Analog

Common

V-

V+

V-

V+

GND

Measured

System

Power

Source 9V

LCD Display

TC7106A

Typical

No Maximum Specified No

Maximum

Specified

Maximum

Specified

Typical

200

180

160

140

120

100

Temperature Coefficient (ppm/°C)

ICL7136

7106A ICL7106

Maximum

Limit

V-

Analog

Common

TC7106A

TC7107A

REF

24kΩ

1kΩ

REF

Set V

REF

= 1/2 V

FULL SCALE

V+

TC7106/A/TC7107/A

DS21455B-page 16



2002 Microchip Technology Inc.

9.0 POWER SUPPLIES

The TC7107A is designed to work from ±5V supplies.

However, if a negative supply is not available, it can be

generated from the clock output with two diodes, two

capacitors, and an inexpensive IC (Figure 9-1).

FIGURE 9-1: GENERATING NEGATIVE

SUPPLY FROM +5V

In selected applications a negative supply is not

required. The conditions to use a single +5V supply

are:

• The input signal can be referenced to the center

of the Common mode range of the converter.

• The signal is less than ±1.5V.

• An external reference is used.

The TSC7660 DC to DC converter may be used to gen-

erate -5V from +5V (Figure 9-2).

FIGURE 9-2: NEGATIVE POWER

SUPPLY GENERATION

WITH TC7660

9.1 TC7107 Power Dissipation

Reduction

The TC7107A sinks the LED display current and this

causes heat to build up in the IC package. If the inter-

nal voltage reference is used, the changing chip tem-

perature can cause the display to change reading. By

reducing the LED common anode voltage, the

TC7107A package power dissipation is reduced.

Figure 9-3 is a curve tracer display showing the rela-

tionship between output current and output voltage for

a typical TC7107CPL. Since a typical LED has 1.8 volts

across it at 7mA, and its common anode is connected

to +5V, the TC7107A output is at 3.2V (point A on

Figure 9-3). Maximum power dissipation is 8.1mA x

3.2V x 24 segments = 622mW.

FIGURE 9-3: TC7107 OUTPUT

CURRENT VS. OUTPUT

VOLTAGE

Notice, however, thatonce the TC7107A output voltage

is above two volts, the LED current is essentially con-

stant as output voltage increases. Reducing the output

voltage by 0.7V (point B in Figure 9-3) results in 7.7mA

of LED current, only a 5 percent reduction. Maximum

power dissipation is only 7.7mA x 2.5V x 24 = 462mW,

a reduction of 26%. An output voltage reduction of 1

volt (point C) reduces LED current by 10% (7.3mA) but

power dissipation by 38% (7.3mA x 2.2V x 24 =

385mW).

Reduced power dissipation is very easy to obtain.

Figure 9-4 shows two ways: either a 5.1 ohm, 1/4 watt

resistor or a 1 Amp diode placed in series with the dis-

play (but not in series with the TC7107A). The resistor

will reduce the TC7107A output voltage, when all 24

segments are “ON,” to point “C” of Figure 9-4. When

segments turn off, the output voltage will increase. The

diode, on the other hand, will result in a relatively

steady output voltage, around point “B.”

In addition to limiting maximum power dissipation, the

resistor reduces the change in power dissipation as the

display changes. This effect is caused by the fact that,

as fewer segments are “ON,” each “ON” output drops

more voltage and current. For the best case of six seg-

TC7107A

V+

OSC1

OSC2

OSC3

GND

V-

V+

CD4009

0.047

µF1N914

1N914

µF–

V- = -3.3V

GND

REF

COM

+5V

LED

DRIVE

V+

V- 21

TC7660

10µF

10µF+2

5(-5V)

TC7107A

CBA

6.000

7.000

8.000

9.000

10.000

2.00 2.50 3.00 3.50 4.00

Output Voltage (V)

Output Current (mA)



2002 Microchip Technology Inc. DS21455B-page 17

TC7106/A/TC7107/A

ments (a “111” display) to worst case (a “1888” display),

the resistor will change about 230mW, while a circuit

without the resistor will change about 470mW. There-

fore, the resistor will reduce the effect of display dissi-

pation on reference voltage drift by about 50%.

The change in LED brightness caused by the resistor is

almost unnoticeable as more segments turn off. If dis-

play brightness remaining steady is very important to

the designer, a diode may be used instead of the

resistor.

FIGURE 9-4: DIODE OR RESISTOR

LIMITS PACKAGE POWER

DISSIPATION

10.0 TYPICAL APPLICATIONS

10.1 Liquid Crystal Display Sources

Several manufacturers supply standard LCDs to inter-

face with the TC7106A 3-1/2 digit analog-to-digital

converter.

Note: Contact LCD manufacturer for full product listing and

specifications.

10.2 Light Emitting Diode Display

Sources

Several LED manufacturers supply seven segment

digits with and without decimal point annunciators for

the TC7107A.

10.3 Decimal Point and Annunciator

Drive

The TEST pin is connected to the internally generated

digital logic supply ground through a 500Ω resistor. The

TEST pin may beused as the negative supply for exter-

nal CMOS gate segment drivers. LCD display annunci-

ators for decimal points, low battery indication, or

function indication may be added without adding an

additional supply. No more than 1mA should be sup-

pliedby the TEST pin; itspotential is approximately 5V

below V+ (see Figure 10-1).

FIGURE 10-1: DECIMAL POINT DRIVE

USING TEST AS LOGIC

GROUND

Manufacturer Address/Phone Representative

Part Numbers*

Crystaloid

Electronics 5282 Hudson Dr.

Hudson, OH 44236

216-655-2429

C5335, H5535,

T5135, SX440

AND 720 Palomar Ave.

Sunnyvale, CA 94086

408-523-8200

FE 0201, 0701

FE 0203, 0701

FE 0501

Epson 3415 Kashikawa st.

Torrance, CA 90505

213-534-0360

LD-B709BZ

LD-H7992AZ

Hamlin, Inc. 612 E. Lake St.

Lake Mills, WI 53551

414-648-236100

3902, 3933, 3903

TP2

TP5

100

kΩTP1

24kΩ

1kΩ

0.1

µF

TP3

0.01

µF

+IN

–

0.22

µF

Display

100

+5V

1MΩ

-5V

150Ω

0.47

µF

TC7107A

40 TP

30 21

20101

kΩ

1N4001

5.1Ω 1/4W

Manufacturer Address/Phone Display

Hewlett-Packard

Components 640 Page Mill Rd.

Palo Alto, CA 94304 LED

AND 720 Palomar Ave.

Sunnyvale, CA 94086

408-523-8200

LED

TC7106A

TEST 37

V+

GND

To LCD

Decimal

Point

To LCD

Decimal

Point

To LCD

Backplane

4049

TC7106A

Decimal

Point

Select

V+

TEST

GND

4030

TC7106/A/TC7107/A

DS21455B-page 18



2002 Microchip Technology Inc.

10.4 Ratiometric Resistance

Measurements

The true differential input and differential reference

make ratiometric reading possible. Typically in a ratio-

metric operation, an unknown resistance is measured,

with respect to a known standard resistance. No accu-

rately defined reference voltage is needed.

The unknown resistance is put in series with a known

standard and a current passed through the pair. The

voltage developed across theunknown isapplied to the

input and the voltage across the known resistor is

applied to the reference input. If the unknown equals

the standard, the display will read 1000.

The displayed reading can be determined from the

following expression:

The display will over range for:

RUNKNOWN ≥ 2xR

STANDARD

FIGURE 10-2: LOW PARTS COUNT

RATIOMETRIC

RESISTANCE

MEASUREMENT

FIGURE 10-3: TEMPERATURE SENSOR

FIGURE 10-4: POSITIVETEMPERATURE

COEFFICIENT RESISTOR

TEMPERATURE SENSOR

FIGURE 10-5: TC7106A, USING THE

INTERNAL REFERENCE:

200mV FULL SCALE, 3

READINGS-PER-SECOND

(RPS)

Displayed Reading()

RUnknown

RS dardtan

------------------------------- x 1000=

REF

Analog

Common

TC7106A

LCD Displa

STANDARD

UNKNOWN

V+

V+ V-

REF

Common

50kΩ

160kΩ300kΩ300kΩ

50kΩ

1N4148

Sensor

TC7106A

= 2V

TC7106A

V+ V-

VIN-

VIN+

VREF+

VREF-

Common

5.6kΩ160kΩ

20kΩ

1N914

20kΩ

0.7%/°C

PTC

100kΩ

100pF

0.47µF

47kΩ

0.22µF

To Display

To Backplane

0.1µF

1kΩ22kΩ

Set V

REF

= 100mV

TC7106A

0.01µF

1MΩ

–

To Pin 1

–



2002 Microchip Technology Inc. DS21455B-page 19

TC7106/A/TC7107/A

FIGURE 10-6: TC7107 INTERNAL

REFERENCE: 200mV

FULL SCALE, 3RPS,

VIN-TIEDTOGNDFOR

SINGLE ENDED INPUTS

FIGURE 10-7: CIRCUIT FOR

DEVELOPING UNDER

RANGE AND OVER

RANGE SIGNALS FROM

TC7106A OUTPUTS

FIGURE 10-8: TC7106/TC7107:

RECOMMENDED

COMPONENT VALUES

FOR 2.00V FULL SCALE

FIGURE 10-9: TC7107OPERATED FROM

SINGLE +5V SUPPLY

100kΩ

100pF

0.47µF

47kΩ

0.22µF

To Display

0.1µF

1kΩ22kΩ

Set V

REF

= 100mV

0.01µF

1MΩ

–

To Pin 1

-5V

+5V

TC7107A

2120

To Logic

VCC

V-

To Logic

VCC

V+

CD4077

U/R

O/R

CD4023

OR 74C10

TC7106A

O/R = Over Range

U/R = Under Ran

100kΩ

100pF

0.047µF

470kΩ

0.22µF

To Display

0.1µF25kΩ

24kΩ

Set VREF = 1V

0.01µF

1MΩ

–

V-

To Pin 1

TC7106A

TC7107A

100pF

0.47µF

47kΩ

To Display

0.1µF1kΩ

V+

Set V

REF

= 100mV

10kΩ10kΩ

1.2V

0.01µF

–

1MΩ

100kΩ

0.22µF

TC7107A

To PIn 1

Note: An external reference must be used in this application.

TC7106/A/TC7107/A

DS21455B-page 20



2002 Microchip Technology Inc.

FIGURE 10-10: 3-1/2 DIGIT TRUE RMS AC DMM

FIGURE 10-11: INTEGRATED CIRCUIT TEMPERATURE SENSOR

SEG

DRIVE

47kΩ

10% +

AD636

–

6.8µF

0.02

µF

20kΩ

10%

10kΩ

1MΩ

IN4148 1µF–

9MΩ

900kΩ

90kΩ

10kΩ

200mV

20V

200V

COM

TC7106A

LCD Displa

24kΩ

1kΩ

2.2µF0.01

µF

1MΩ 10%

V+

Analog Common

V-

C1 = 3 - 10pF Variable

C2 = 132pF Variable

REF

V-

TC7106A

REF

Common

V+

–

V+

2 1

4 26

Temperature

Dependent

Output

1.3k 50kΩ

Constant 5V

50kΩ

51kΩ5.1kΩ

OUT

1.86V @

25°C

= 2.00V

GND V-

OUT

ADJ

TEMP

REF02 TC911

REF



2002 Microchip Technology Inc. DS21455B-page 21

TC7106/A/TC7107/A

11.0 PACKAGING INFORMATION

11.1 Package Marking Information

Package marking data not available at this time.

11.2 Taping Form

PIN 1

Component Taping Orientation for 44-Pin PLCC Devices

User Direction of Feed

Standard Reel Component Orientation

for TR Suffix Device

Note: Drawing does not represent total number of pins.

Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size

44-Pin PLCC 32 mm 24 mm 500 13 in

Carrier Tape, Number of Components Per Reel and Reel Size

Component Taping Orientation for 44-Pin PQFP Devices

User Direction of Feed

PIN 1

Standard Reel Component Orientation

for TR Suffix Device

Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size

44-Pin PQFP 24 mm 16 mm 500 13 in

Carrier Tape, Number of Components Per Reel and Reel Size

Note: Drawing does not represent total number of pins.

TC7106/A/TC7107/A

DS21455B-page 22



2002 Microchip Technology Inc.

11.3 Package Dimensions

Dimensions: inches (mm)

2.065 (52.45)

2.027 (51.49)

.200 (5.08)

.140 (3.56)

.150 (3.81)

.115 (2.92)

.070 (1.78)

.045 (1.14)

.022 (0.56)

.015 (0.38)

.110 (2.79)

.090 (2.29)

.555 (14.10)

.530 (13.46)

.610 (15.49)

.590 (14.99)

.015 (0.38)

.008 (0.20)

.700 (17.78)

.610 (15.50)

.040 (1.02)

.020 (0.51)

40-Pin PDIP (Wide) PIN 1

3° MIN.

Dimensions: inches (mm)

.015 (0.38)

.008 (0.20)

.620 (15.75)

.590 (15.00)

.700 (17.78)

.620 (15.75)

.540 (13.72)

.510 (12.95)

2.070 (52.58)

2.030 (51.56)

.210 (5.33)

.170 (4.32)

.020 (0.51)

.016 (0.41)

.110 (2.79)

.090 (2.29)

.065 (1.65)

.045 (1.14)

.200 (5.08)

.125 (3.18)

.098 (2.49) MAX. .030 (0.76) MIN.

.060 (1.52)

.020 (0.51)

.150 (3.81)

MIN.

40-Pin CERDIP (Wide)

PIN 1

3° MIN.



2002 Microchip Technology Inc. DS21455B-page 23

TC7106/A/TC7107/A

11.3 Package Dimensions (Continued)

Dimensions: inches (mm)

.695 (17.65)

.685 (17.40)

.656 (16.66)

.650 (16.51)

.656 (16.66)

.650 (16.51)

.021 (0.53)

.013 (0.33)

.032 (0.81)

.026 (0.66)

.630 (16.00)

.591 (15.00)

.120 (3.05)

.090 (2.29)

.180 (4.57)

.165 (4.19)

.695 (17.65)

.685 (17.40)

.050 (1.27) TYP.

.020 (0.51) MIN.

PIN 1

44-Pin PLCC

Dimensions: inches (mm)

.557 (14.15)

.537 (13.65)

.398 (10.10)

.390 (9.90)

.031 (0.80) TYP.

.018 (0.45)

.012 (0.30) .398 (10.10)

.390 (9.90)

.010 (0.25) TYP.

.096

(

2.45

)

MAX.

.557 (14.15)

.537 (13.65)

.083 (2.10)

.075 (1.90)

.041 (1.03)

.026 (0.65)

7° MAX.

.009 (0.23)

.005 (0.13)

44-Pin PQFP

PIN 1

TC7106/A/TC7107/A

DS21455B-page 24



2002 Microchip Technology Inc.

PRODUCT IDENTIFICATION SYSTEM

To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.

SALES AND SUPPORT

Data Sheets

Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recom-

mended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:

1. Your local Microchip sales office

2. The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277

3. The Microchip Worldwide Site (www.microchip.com)

Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using.

New Customer Notification System

PART CODE TC711X X X XXX

6 = LCD

7 = LED

A or blank*

R (reversed pins) or blank (CPL pkg only)

* "A" parts have an improved reference TC

Package Code (see below):

}



2002 Microchip Technology Inc. DS21455B-page 25

TC7106/A/TC7107/A

Information contained in this publication regarding device

applications and the like is intended through suggestion only

and may be superseded by updates. It is your responsibility to

ensure that your application meets with your specifications.

No representation or warranty is given and no liability is

assumed by Microchip Technology Incorporated with respect

to the accuracy or use of such information, or infringement of

patents or other intellectual property rights arising from such

use or otherwise. Use of Microchip’s products as critical com-

ponents in life support systems is not authorized except with

express written approval by Microchip. No licenses are con-

veyed, implicitly or otherwise, under any intellectual property

rights.

Trademarks

The Microchip name and logo, the Microchip logo, FilterLab,

KEELOQ,microID,MPLAB,PIC,PICmicro,PICMASTER,

PICSTART, PRO MATE, SEEVAL and The Embedded Control

Solutions Company are registered trademarks of Microchip Tech-

nologyIncorporated in the U.S.A. and other countries.

dsPIC, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB,

In-Circuit Serial Programming, ICSP, ICEPIC, microPort,

Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM,

MXDEV, PICC, PICDEM, PICDEM.net, rfPIC, Select Mode

and Total Endurance are trademarks of Microchip Technology

Incorporated in the U.S.A.

Serialized Quick Turn Programming (SQTP) is a service mark

of Microchip Technology Incorporated in the U.S.A.

All other trademarks mentioned herein are property of their

respective companies.

Printed on recycled paper.

Microchip received QS-9000 quality system

certification for its worldwide headquarters,

design and wafer fabrication facilities in

Chandler and Tempe, Arizona in July 1999

and Mountain View, California in March 2002.

The Company’s quality system processes and

procedures are QS-9000 compliant for its

PICmicro®8-bit MCUs, KEELOQ®code hopping

devices, Serial EEPROMs, microperipherals,

non-volatile memory and analog products. In

addition, Microchip’s quality system for the

design and manufacture of development

systems is ISO 9001 certified.

DS21455B-page 26



2002 Microchip Technology Inc.

AMERICAS

Corporate Office

2355 West Chandler Blvd.

Chandler, AZ 85224-6199

Tel: 480-792-7200 Fax: 480-792-7277

Technical Support: 480-792-7627

Web Address: http://www.microchip.com

Rocky Mountain

2355 West Chandler Blvd.

Chandler, AZ 85224-6199

Tel: 480-792-7966 Fax: 480-792-7456

Atlanta

500 Sugar Mill Road, Suite 200B

Atlanta, GA 30350

Tel: 770-640-0034 Fax: 770-640-0307

Boston

2 Lan Drive, Suite 120

Westford, MA 01886

Tel: 978-692-3848 Fax: 978-692-3821

Chicago

333 Pierce Road, Suite 180

Itasca, IL 60143

Tel: 630-285-0071 Fax: 630-285-0075

Dallas

4570 Westgrove Drive, Suite 160

Addison, TX 75001

Tel: 972-818-7423 Fax: 972-818-2924

Detroit

Tri-Atria Office Building

32255 Northwestern Highway, Suite 190

Farmington Hills, MI 48334

Tel: 248-538-2250 Fax: 248-538-2260

Kokomo

2767 S. Albright Road

Kokomo, Indiana 46902

Tel: 765-864-8360 Fax: 765-864-8387

Los Angeles

18201 Von Karman, Suite 1090

Irvine, CA 92612

Tel: 949-263-1888 Fax: 949-263-1338

New York

150 Motor Parkway, Suite 202

Hauppauge, NY 11788

Tel: 631-273-5305 Fax: 631-273-5335

San Jose

Microchip Technology Inc.

2107 North First Street, Suite 590

San Jose, CA 95131

Tel: 408-436-7950 Fax: 408-436-7955

Toronto

6285 Northam Drive, Suite 108

Mississauga, Ontario L4V 1X5, Canada

Tel: 905-673-0699 Fax: 905-673-6509

ASIA/PACIFIC

Australia

Microchip Technology Australia Pty Ltd

Suite 22, 41 Rawson Street

Epping 2121, NSW

Australia

Tel: 61-2-9868-6733 Fax: 61-2-9868-6755

China - Beijing

Microchip Technology Consulting (Shanghai)

Co., Ltd., Beijing Liaison Office

Unit 915

Bei Hai Wan Tai Bldg.

No. 6 Chaoyangmen Beidajie

Beijing, 100027, No. China

Tel: 86-10-85282100 Fax: 86-10-85282104

China - Chengdu

Microchip Technology Consulting (Shanghai)

Co., Ltd., Chengdu Liaison Office

Rm. 2401, 24th Floor,

Ming Xing Financial Tower

No. 88 TIDU Street

Chengdu 610016, China

Tel: 86-28-6766200 Fax: 86-28-6766599

China - Fuzhou

Microchip Technology Consulting (Shanghai)

Co., Ltd., Fuzhou Liaison Office

Unit 28F, World Trade Plaza

No. 71 Wusi Road

Fuzhou 350001, China

Tel: 86-591-7503506 Fax: 86-591-7503521

China - Shanghai

Microchip Technology Consulting (Shanghai)

Co., Ltd.

Room 701, Bldg. B

Far East International Plaza

No. 317 Xian Xia Road

Shanghai, 200051

Tel: 86-21-6275-5700 Fax: 86-21-6275-5060

China - Shenzhen

Microchip Technology Consulting (Shanghai)

Co., Ltd., Shenzhen Liaison Office

Rm. 1315, 13/F, Shenzhen Kerry Centre,

Renminnan Lu

Shenzhen 518001, China

Tel: 86-755-2350361 Fax: 86-755-2366086

Hong Kong

Microchip Technology Hongkong Ltd.

Unit 901-6, Tower 2, Metroplaza

223 Hing Fong Road

Kwai Fong, N.T., Hong Kong

Tel: 852-2401-1200 Fax: 852-2401-3431

India

Microchip Technology Inc.

India Liaison Office

Divyasree Chambers

1 Floor, Wing A (A3/A4)

No. 11, O’Shaugnessey Road

Bangalore, 560 025, India

Tel: 91-80-2290061 Fax: 91-80-2290062

Japan

Microchip Technology Japan K.K.

Benex S-1 6F

3-18-20, Shinyokohama

Kohoku-Ku, Yokohama-shi

Kanagawa, 222-0033, Japan

Tel: 81-45-471- 6166 Fax: 81-45-471-6122

Korea

Microchip Technology Korea

168-1, Youngbo Bldg. 3 Floor

Samsung-Dong, Kangnam-Ku

Seoul, Korea 135-882

Tel: 82-2-554-7200 Fax: 82-2-558-5934

Singapore

Microchip Technology Singapore Pte Ltd.

200 Middle Road

#07-02 Prime Centre

Singapore, 188980

Tel: 65-6334-8870 Fax: 65-6334-8850

Taiwan

Microchip Technology Taiwan

11F-3, No. 207

Tung Hua North Road

Taipei, 105, Taiwan

Tel: 886-2-2717-7175 Fax: 886-2-2545-0139

EUROPE

Denmark

Microchip Technology Nordic ApS

Regus Business Centre

Lautrup hoj 1-3

Ballerup DK-2750 Denmark

Tel: 45 4420 9895 Fax: 45 4420 9910

France

Microchip Technology SARL

Parc d’Activite du Moulin de Massy

43 Rue du Saule Trapu

Batiment A - ler Etage

91300 Massy, France

Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79

Germany

Microchip Technology GmbH

Gustav-Heinemann Ring 125

D-81739 Munich, Germany

Tel: 49-89-627-144 0 Fax: 49-89-627-144-44

Italy

Microchip Technology SRL

Centro Direzionale Colleoni

Palazzo Taurus 1 V. Le Colleoni 1

20041 Agrate Brianza

Milan, Italy

Tel: 39-039-65791-1 Fax: 39-039-6899883

United Kingdom

Arizona Microchip Technology Ltd.

505 Eskdale Road

Winnersh Triangle

Wokingham

Berkshire, England RG41 5TU

Tel: 44 118 921 5869 Fax: 44-118 921-5820

03/01/02

*DS21455B*

WORLDWIDE SALES AND SERVICE