MICROCHIP TC7106, TC7106A, TC7107, TC7107A Technical data

TC7106/A/TC7107/A

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

Features

• Internal Reference with LowTemperature 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: 10

• Differential R eference Inputs Simplify Ratiometric
Measurements

• Low Power Operation: 10mW

12

Applications

• Thermometry

• Bridge Readouts:StrainGauges, Load Cel ls, Null
Detectors

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

• Digital Scales, Process Monitors

• PortableInstrumentation

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 tempera­ture coefficient.Thisrepresentsa4 to 7 times improve­ment 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

Ω

make i t suitable for portable applications.
The TC7106A/TC7107A reduces linearity error to less

than1 count. Rollovererror–thedifference in readings
forequalmagnitude,butoppositepolarity input signals,
is below ±1 count. High impedance differential inputs
offer 1pA leakage current and a 10
ance. The differentialreferenceinput allows ratiometric
measurements for ohms or bridge transducer mea­surements.The15µV
“rock solid” reading. The auto-zero cycle ensures a
zero display reading with a zero volts input.

noise performanceensuresa

P–P

12

Ω input imped-

Device Selection Table

Package

Code

CPI 40-Pin PDIP Normal 0°Cto+70°C

IPL 40-Pin PDIP Normal -25°Cto+85°C

IJL 40-PinCERDIP Normal -25°Cto+85°C

CKW 44-PinPQFP FormedLeads 0°Cto+70°C

CLW 44-Pin PLCC — 0°Cto+70°C



2002 Microchip TechnologyInc. DS21455B-page 1

Package Pin Layout

Temperature

Range

TC7106/A/TC7107/A

D

Package Type

1

V+

Normal Pin

D

2

Configuration

1

C

3

1

B

4

1

A

AB

POL

1

F

1

G

1

E

1

D

2

10

C

2

B

11

2

A

12

2

F

13

2

E

14

2

15

D

3

B

16

3

F

17

3

18

E

3

19

4

20

5

6

7

8

TC7106ACPL

9

TC7107AIPL

1's

10's

100's

1000's

(Minus Sign) (Minus Sign)

40

OSC1

39

OSC2

38

OSC3

37

TEST

36

V

35

V

C

34

C

33

ANALOG

32

COMMON

31

V

V

30

C

29

28

V

27

V

26

V-

25

G

24

C

23

A

22

G

21

BP/GND
(7106A/7107A)

REF

REF

REF

REF

IN

IN

AZ

BUFF

INT

2

3

3

3

+

-

+

-

+

-

100's

OSC1

OSC2

OSC3

TEST

V

REF

V

REF

C

REF

C

REF

ANALOG

COMMON

V

V

C

V

BUFF

V

100's

BP/GND

(7106A/7107A)

+

-

+

-

+

10

IN

-

11

IN

12

AZ

13

14

INT

15

V-

G

16

2

C

17

3

A

18

3

G

19

3

20

40-Pin CERDIP40-Pin PDIP

1

Reverse

2

Configuration

3

4

5

6

7

8

TC7106AIJL

9

TC7107AIJL

40

V+

D

39

1

C

38

1

B

37

1

A

36

1's

1

F

35

1

G

34

1

E

33

1

32

D

2

31

C

2

B

30

2

10's

A

29

2

F

28

2

E

27

2

26

D

3

B

25

3

100's

F

24

3

23

E

3

22

AB

1000's

4

21

POL

44-Pin PLCC 44-Pin PQFP

1

A

B1C1D1V+NCOSC1

7

F

1

8

G

1

9

E

1

10

D

2

11

C

2

12

NC

13

B

2

14

A

2

15

F

2

16

E

2

17

D

3

TC7106ACLW
TC7107ACLW

18 19 20 21 22 23 24 25 26 27 28

3F3

3AB4

B

E

POL

OSC2

44 43 42 41 40

123456

3A3C3G2

G

NC

BP/GND

OSC3

TEST

REF HI

39

38

37

36

35

34

33

32

31

30

29

REF LO

C

REF

C

REF

COMMON

IN HI

NC

IN LO

A/Z

BUFF

INT

V-

TEST

OSC3

OSC2

OSC1

1

NC

2

NC

3

4

5

NC

6

7

8

V+

9

D

1

10

C

1

11

B

1

12 13 14 15 16 17 18 19 20 21 22

REFCREF

REF HI

REF LO

C

COM

IN HI

394041424344

TC7106ACKW
TC7107ACKW

1F1

1E1D2C2B2A2F2E2D3

A

G

IN LO

A/Z

BUFF

INT

38 37 36 35 34

V-

NC

33

G

32

2

C

31

3

A

30

3

G

29

3

BP/GN

28

POL

27

26

AB

4

25

E

3

24

F

3

23

B

3

DS21455B-page 2



2002 Microchip TechnologyInc.

Typical Application

r

TC7106/A/TC7107/A

+

Analog

Input

–

1MΩ

0.01µF

47kΩ

0.22µF

0.47µF

0.1µF

34

+

REF

31

+

V

IN

30

V

-

IN

ANALOG

32

COMMON

TC7106/A

28

29

27

TC7107/A

V

BUFF

C

AZ

V

INT

39 38 40

R

OSC

100kΩ

33

C

REF

C

100pF

-C

OSC

2 - 19

22 - 25

POL

BP

V+

V

REF

V

REF

V-

OSC1OSC3OSC2

Segment
Drive

20

Minus Sign

21

1

V

REF

36

+

100mV

35

-

26

3 Conversions/Sec
200mV Full Scale

LCD Display (TC7106/A) o

Common Node w/ LED

Display (TC7107/A)

Backplane
Drive

24kΩ

+

1kΩ

To Analog
Common (Pin 32)

9V



2002 Microchip TechnologyInc. DS21455B-page 3

TC7106/A/TC7107/A

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 (T

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

StorageTemperature Range..............-65°C t o +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 (T

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

StorageTemperature Range..............-65°C t o +150°C

≤ 70°C) (Note 2):

A

≤ 70°C) (Note 2):

A

*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 affectdevice 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,

f

= 48kHz. Partsare testedin the circuitof the Typical Operating Circuit.

CLOCK

Symbol Parameter Min Typ Max Unit Test Conditions

Z

IR

R/O Rollover Error (Difference in Readingfor

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

DS21455B-page 4

Zero Input Reading -000.0 ±000.0 +000.0 Digital

Reading

Ratiometric Reading 999 999/1000 1000 Digital

Reading

-1 ±0.2 +1 Counts V
Equal Positive and Negative
Reading Near Full Scale)

Linearity (Max. Deviation from Best
Straight Line Fit)

2: Dissipationrating assumes device is mounted with all leads solderedto printedcircuit board.
3: Refer to “Differential Input” discussion.
4: Backplane drive is in phasewithsegment drive for “OFF” segment,180°out of phase for “ON” segment.

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

-1 ±0.2 +1 Counts Full Scale = 200mV or

VIN=0.0V
Full Scale = 200.0mV

V

IN=VREF

V

=100mV

REF

-=+VIN+ ≅ 200mV

IN

Full Scale = 2.000V



2002 Microchip TechnologyInc.

TC7106/A/TC7107/A

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,

f

= 48kHz. Partsare testedin the circuitof the Typical Operating Circuit.

CLOCK

Symbol Parameter Min Typ Max Unit Test Conditions

CMRR Common Mode Rejection Ratio (Note 3) —50—µV/V VCM=±1V,VIN=0V,

e

N

I

L

Noise (Peak to Peak Value not Exceeded
95% of Time)

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

—15—µVVIN=0V

Zero Reading Drift — 0.2 1 µV/°C V

—1.02µV/°C V

TC

Scale FactorTemperatureCoefficient — 1 5 ppm/°C VIN=199.0mV,

SF

——20ppm/°CV

I

DD

V

C

V

CTC

SupplyCurrent (Does not include LED
Current For TC7107/A)

AnalogCommonVoltage
(with Respectto PositiveSupply)

T emperature Coefficient of Analog

—0.81.8mAV

2.7 3.05 3.35 V 25kΩ BetweenCommonand

————25kΩ BetweenCommonand

Common (withRespectto Positive Supply)

7106/7/A

7106/7

V

CTC

V

SD

T emperature Coefficient of Analog
Common (withRespectto Positive Supply)

TC7106A ONLY Peak to Peak

— — 75 ppm/°C 0°C≤ TA≤ +70°C

456VV+toV-=9V

20
80

50
—

ppm/°C
ppm/°C

SegmentDriveVoltage

V

BD

TC7106A ONLY Peak to Peak
Backplane Drive Voltage

TC7107A ONLY

456VV+toV-=9V

58.0—mAV+=5.0V

SegmentSinking Current (Except Pin 19)
TC7107A ONLY

10 16 — mA V+ = 5.0V

SegmentSinking Current (Pin19)

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

2: Dissipationrating assumes device is mounted with all leads solderedto printedcircuit board.
3: Refer to “Differential Input” discussion.
4: Backplane drive is in phasewithsegment drive for “OFF” segment,180°out of phase for “ON” segment.

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

Full Scale = 200.0mV

Full Scale - 200.0mV

=0V

IN

“C” Device = 0°C to +70°C

=0V

IN

“I” Device= -25°C to +85°C

“C” Device = 0°C to +70°C
(Ext.Ref = 0ppm°C)

=199.0mV

IN

“I” Device= -25°C to +85°C

=0.8

IN

Positive Supply

Positive Supply
0°C ≤ T

≤ +70°C

A

(“C” Commercial Temperature
Range Devices)

(“I” Industrial Temperature
Range Devices)

(Note 4)

(Note 4)

Segment Voltage = 3V

Segment Voltage = 3V



2002 Microchip TechnologyInc. DS21455B-page 5

TC7106/A/TC7107/A

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

1 (40) V+ Positive supply voltage.
2(39)D
3(38)C
4(37)B
5(36)A
6(35)F
7(34)G
8(33)E

9(32)D
10 (31) C
11 (30) B
12 (29) A
13 (28) F
14 (27) E
15 (26) D
16 (25) B
17 (24) F
18 (23) E
19 (22) AB
20 (21) POL Activates the negativepolarity display.
21 (20) BP/GND LCD Backplane drive output (TC7106A). Digital Ground (TC7107A).
22 (19) G
23 (18) A
24 (17) C
25 (16) G
26 (15) V- Negative power supply voltage.
27 (14) V

28 (13) V

29 (12) C

30 (11) V
31 (10) V
32 (9) ANALOG

33 (8) C
34 (7) C

35 (6) V

Pin No.

(40-Pin PDIP)

(Reversed

Symbol Description

Activates the D section of the units display.

1

Activates the C section of the units display.

1

Activates the B section of t he units display.

1

Activates the A section of t he units display.

1

Activates the F sectionof the units display.

1

Activates the G section of the units display.

1

Activates the E section of t he units display.

1

Activates the D section of the tens display.

2

Activates the C section of the tens display.

2

Activates the B section of the tens display.

2

Activates the A section of the tens display.

2

Activates the F section of the tensdisplay.

2

Activates the E section of the tens display.

2

Activates the D section of the hundreds display.

3

Activates the B section of the hundreds display.

3

Activates the F section of the hundreds display.

3

Activates the E section of the hundreds display.

3

Activates both halves of the 1 in the thousands display.

4

Activates the G section of the hundreds display.

3

Activates the A section of the hundreds display.

3

Activates the C section of the hundreds display.

3

Activates the G section of the tens display.

2

Integrator output. Connection point for integration capacitor. See INTEGRATING

INT

CAPACITOR section for more details.

BUFF

Integration resistor connection. Use a 47kΩ resistor fora 200mV fullscalerange and
a47kΩ resistor for 2V full scale range.

The size of the auto-zero capacitor influences system noise.Usea 0.47µF capacitor

AZ

for 200mV full scale,anda 0.047µF capacitor for 2V full scale. See Section 7.1 on
Auto-Zero Capacitor for more details.

- The analogLOW input is connected to this pin.

IN

+ The analog HIGH input signal is connected to this pin.

IN

This pin is primarilyusedto set the Analog Commonmode voltage for battery opera-

COMMON

tion or in systems where the input signal is referenced to the power supply. It also
actsasareferencevoltage source.See Section 8.3 on ANALOGCOMMONfor more
details.

- See Pin 34.

REF

+A0.1µF capacitor is used in mostapplications. If a largeCommonmodevoltage

REF

exists (for example, the V
used, a 1µF capacitoris recommended and will hold the rollover errorto 0.5 count.

- See Pin 36.

REF

- pin is not at analog common), and a 200mV scale is

IN

DS21455B-page 6



2002 Microchip TechnologyInc.

TC7106/A/TC7107/A

TABLE 2-1: PIN FUNCTION TABLE (CONTINUED)

Pin Number

(40-Pin PDIP)

Normal

36 (5) V

37 (4) TEST Lamp test. When pulled HIGH (to V+) all segments willbe turnedon and the display

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

Pin No.

(40-Pin PDIP)

(Reversed

Symbol Description

+ Theanalog inputrequired to generate a fullscaleoutput (1999counts). Place100mV

REF

between Pins 35 and 36 for 199.9mVfull scale. Place1V between Pins 35 and 36 for
2V full scale. See paragraph on Reference Voltage.

shouldread -1888. It may also be used as a negativesupplyfor externallygenerated
decimal points. See paragraph under TEST for additionalinformation.

section), connect Pin 40 to the junction of a 100kΩ resistor and a 100pF capacitor.
The 100kΩ resistoristiedto Pin 39 and the 100pFcapacitor is tied to Pin 38.



2002 Microchip TechnologyInc. DS21455B-page 7

TC7106/A/TC7107/A

q

y

3.0 DETAILED DESCRIPTION

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

3.1 Dual S lope Conversion Principles

The TC7106Aand TC7107A are dual slope,integrating
analog-to-digital converters. An understanding of the
dualslopeconversiontechnique will aid infollowingthe
detailed operation theory.

The conventional dual slope converter measurement
cycle has two distinct phases:

• Input Signal Integration

• Reference VoltageIntegration (De-integration)
The input signal being converted is integrated for a

fixed time period (T
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 (T
Figure 3-1.

FIGURE 3-1: BASIC DUAL SLOPE

Analog

Input

Signal

). Time is measured by counting

SI

). See

RI

CONVERTER

C

Integrator

–

+

Comparator

–

+

For a constant VIN:

EQUATION 3-2:

T

VIN=V

RI

R

T

SI

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 inher­ent benefit is noise immunity. Noise spikes are inte­grated or averaged to zero during the integration
periods.IntegratingADCs areimmunetothe largecon­version errors that plague successive approximation
converters in high noise environments. Interfering sig­nals with frequency components at multiples of the
averaging period will be attenuated. Integrating ADCs
commonlyoperatewiththesignalintegrationperiodset
to a multiple of the 50/60Hz power line period (see
Figure 3-2).

FIGURE 3-2: NORM AL MODE

REJECTION OF DUAL
SLOPE CONVERTER

30

20

+/–

REF

Voltage

Output

Integrator

Fixed

Signal

Integrate

Time

Switch

Driver

Polarity Control

DISPLAY

Variable
Reference
Integrate
Time

Phase
Control

≈ V

V

IN

REF

VIN ≈ 1/2 V

REF

Control

Logic

Clock

Counter

In a simple dual slope converter, a complete c onver­sion requires the integrator output to “ramp-up” and
“ramp-down.” A simple mathematical equation relates
the input signal, referencevoltage and integration time.

EQUATION 3-1:

T

Where:

V

R

T

SI

T

RI

1

SI

VIN(t)dt=

∫

RC

0

= Reference voltage
= Signal integrationtime (fixed)
= Referencevoltageintegration time (variable).

V

RTRI

RC

10

Normal Mode Rejection (dB)

0

0.1/T 1/T 10/T

T = Measured Period

Input Fre

uenc

DS21455B-page 8



2002 Microchip TechnologyInc.

TC7106/A/TC7107/A

4.0 ANALOG SECTION

In addition to the basic signal integrate and de­integrate 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 integratecycle.

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 internalnodesare 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 com­parator offset voltage error compensation. The voltage
levelestablishedonC
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 t he internal differen­tial inputs connect to V
input signal is integrated for a fixed time period. The
TC7136/A signal integration period is 1000 clock peri­ods or counts. The externally set clock frequency is
divided by four before clocking the internal counters.

The i ntegration t ime period is:

EQUATION 4-1:

Where: F

OSC

compensatesfordeviceoffset

AZ

+ and VIN-. The differential

IN

T

4

=

SI

= external clock frequency.

F

x 1000

OSC

The time requiredforthe output to return to zero is pro­portional to the input signal and is between0 and 2000
counts.

The digital reading displayed is:

EQUATION 4-2:

V

1000 =

V

IN

REF

5.0 DIGITAL SECTION (TC7106A)

The TC7106A (Figure 5-2) contains all t he segment
drivers necessary t o 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 seg­ment. This insures long LCD display life. The polarity
segment driver is “ON” for negative analog inputs. If
V

+andVIN-are reversed, this indicator will reverse.

IN

When the TEST pin on the TC7106A is pulledto 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 DIS­PLAY IN THIS MODE FOR MORE T HAN SEVERAL
MINUTES! LCD di splays 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

The differential input voltage must be within the device
Common mode range when the converter and mea­sured system share the same power supply common
(ground). If the converter and measured system do not
share the same power supply common, V
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.
V

- is internally connected to analog common and

IN

V

+ is connectedacross the previously charged refer-

IN

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.



2002 Microchip TechnologyInc. DS21455B-page 9

-should be

IN

In the TC7106A, an internal digital ground is generated
from a 6-voltzener diode and a large P channel source
follower. This supply is made stiff to absorb the large
capacitive currents when the backplane voltage i s
switched.

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

Display Font

TC7106/A/TC7107/A

T

FIGURE 5-2: TC7106A BLOCK DIAGRAM

V+

Segment

0.5mA

LCD Display

Output

2mA

Backplane

21

÷ 200

Decode

7 Segment

Decode

7 Segment

LCD Segment Drivers

Decode

7 Segment

To

INT

INT

C

V

27333634

Digital

Section

+

Data Latch

–

Tens Units

Hundreds

Thousands

To Switch Drivers

V+

1

From Comparator Output

Clock

TES

37

6.2V

Control Logic

÷4

OSC

F

26

Ω

500

= 1V

TH

V

Internal Digital Ground

V-

OSC3OSC1

OSC

C

39

OSC

OSC2

R

Typical Segment Output

Internal Digital Ground

AZ

C

INT

R

TC7106A

REF

C

V+

BUFF

V

-

REF

C

-

REF

+V

REF

V

+

REF

C

29

Integrator

1

28

35

A/Z

31

Comparator

Low

Tempco

DE

(+)

(–)

DE

INT

+

IN

V

V

–

A/Z

REF

+

DE (–)

DE (+)

32

ANALOG

V+ – 3.0V

AZ & DE (±)

30

-

IN

V

COMMON

26

INT

–

+

–

+

A/Z

A/Z

10

µA

40 38

V-

DS21455B-page 10



2002 Microchip TechnologyInc.

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
backplanedrivehavebeen eliminatedand the segment
drive is typically8mA. The 1000's output (Pin 19) sinks
currentfrom two LED segments,and has a 16mA drive
capability.

In both devices, the polarity indication is “ON” for neg­ative analog inputs. If V
indication can be reversed also, if desired.

The display font is the same as the TC7106A.

6.1 System Timing

The oscillatorfrequencyi s dividedby4priorto clocking
the internal decade counters. The four-phase mea­surement 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 follow­ing length:

1. Auto-zero phase: 1000 to 3000 counts (4000 to
12000 clock pulses).

For signals less than full scale, the auto-zero phase i s
assigned the unused reference integrate time period:

2. Signal integrate: 1000 counts (4000 clock
pulses).

This time period is fixed. The i ntegration period is:

- and VIN+ are reversed, this

IN

6.2 Clock Circuit

Three clockingmethods may be used (see Figure 6-1):

1. An external oscillator connected to Pin 40.

2. A crystal between Pins 39 and 40.

3. An RC oscillatorusing all three pins.

FIGURE 6-1: CLOCK CIRCUITS

TC7106A
TC7107A

To

÷

4

Counter

39

38

EXT
OSC

40

Crystal

RC Network

To TEST Pin on TSC7106A
To GND Pin on TSC7107A

EQUATION 6-1:

1



TSI= 4000

Where: F

3. ReferenceIntegrate:0 to2000counts(0to8000
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.

is the externally set clock frequency.

OSC



F

OSC







2002 Microchip TechnologyInc. DS21455B-page 11

TC7106/A/TC7107/A

FIGURE 6-2: TC7107A BLOCK DIAGRAM

V+

0.5mA

Led Display

Output

Segment

8mA

Decode

7 Segment

Decode

7 Segment

LCD Segment Drivers

Decode

7 Segment

To

INT

INT

C

V

27333634

Digital

Section

+

Data Latch

–

Tens Units

Hundreds

Thousands

To Switch Drivers

V+

1

from Comparator Output

Clock

21

Logic Control

÷4

OSC

F

Digital

Ground

500Ω

Digital Ground

37

39

TEST

OSC3OSC1

OSC2

OSC

R

OSC

C

Typical Segment Output

Internal Digital Ground

AZ

C

INT

R

V

-

TC7107A

C

-

REF

REF

C

+V

REF

V

+

REF

C

V+

BUFF

REF

Integrator

29

1

28

35

–

–

A/Z

A/Z

10

Comparator

+

A/Z

REF

Low

Tempco

V

–

A/Z

+

DE (–)

DE (+)

32

V+ – 3.0V

AZ & DE (±)

30

ANALOG

COMMON

26

INT

-

IN

V

+

DE

(+)

(–)

DE

µA

INT

31

+

IN

V

40 38

V-

DS21455B-page 12



2002 Microchip TechnologyInc.

TC7106/A/TC7107/A

7.0 COMPONENT VALUE

SELECTION

7.1 Auto-Zero Capacitor (CAZ)

The CAZcapacitorsize has some influence on system
noise. A 0. 47µF capacitor is r ecommended for 200mV
full scaleapplicationswhere1LSBis100µV.A0.047µF
capacitoris adequate for 2.0V full scale applications.A
mylar type dielectric capacitor is adequate.

7.2 Reference Voltage Capacitor

)

(C

REF

The reference voltage used to ramp the integrator out­put voltage back to zero during the reference integrate
cycleisstoredonC
when V
mode voltage exists (V
application requires 200mV full scale,increase C

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

A mylar dielectric capacitoris adequate.

- is tied to analogcommon. If a largeCommon

IN

7.3 Integrating Capacitor (C

C

shouldbe selected to maximize the integrator out-

INT

put voltage swing without causing output saturation.
Due to the TC7106A/7107Asuperior temperature coef­ficient specification, analog common will normally sup­ply t he differential voltage reference. For this case, a
±2V full scale integrator output swing is satisfactory.
For 3 readings/second(F
is suggested. If a different oscillator frequencyis used,
C

must be changed in inverse proportiontomaintain

INT

the nominal ±2V integrator swing.
An exact expression for C

EQUATION 7-1:

C

INT

Where:

= Clock Frequency at Pin 38

F

OSC

= Full Scale Input Voltage

V

FS

= Integrating Resistor

R

INT

= Desired Full Scale Integrator Output Swing

V

INT

C

must have low dielectric absorption to minimize

INT

rollover error. A polypropylene capacitor is recom­mended.

.A0.1µF capacitorisacceptable

REF

- – analog common)and the

REF

INT

=48kHz),a0.22µF value

OSC

is:

INT

V

(4000)

=

1



F

OSC

V

INT





FS

R

INT



REF

)

7.4 Integrating Resistor (R

The input buffer amplifier and integrator are designed
with class A output stages.The output stageidling cur­rent i s 100µA. The integrator and buffer can supply
20µA drive currents with negligible linearity errors.
R

ischosentoremainin the outputstagelineardrive

INT

region, but not so large that printed circuit board leak­age currents induce errors. For a 200mV full scale,
R

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

INT

Component

Value

C

AZ

R

INT

C

INT

Note: F

to

7.5 Oscillator Components

R

OSC

selected using the equation:

OSC

(Pin 40 to Pin 39) should be 100kΩ.C

Nominal Full Scale Voltage

200.0mV 2.000V

0.47µF 0.047µF
47kΩ 470kΩ

0.22µF0.22µF

= 48kHz (3 readings per sec).

INT

)

is

OSC

EQUATION 7-2:

F

For F
Note that F

TC7106A internal control clock. The backplane drive
signal is derived by dividing F

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 r ejection, oscillator frequencies of 200kHz,
100kHz, 66-2/3kHz, 50kHz, 40kHz, etc. would be suit­able. Note that 40kHz (2.5 readings/second) will reject
both 50Hz and 60Hz.

of 48kHz, C

OSC

is divided by four to generate the

OSC

0.45

=

OSC

OSC

RC

is 100pF nominally.

by 800.

OSC

7.6 Reference Voltage Selection

A full scale reading (2000 counts) requires the input
signal be twice the reference voltage.

Required Full Scale Voltage* V

200.0mV 100.0mV

2.000V 1.000V

*V

=2V

FS

In some applications, a scale factor other than unity
may exist between a transducer output voltage and the
required di gital reading. Assume, for example, a pres­sure transducer output is 400mV for 2000 lb/in
Rather than dividing the input voltage by two, the refer­ence voltage should be set to 200mV. This permitsthe
transducer input t o be used directly.

REF.

REF

2

.



2002 Microchip TechnologyInc. DS21455B-page 13

TC7106/A/TC7107/A

(a)(

)

–

Thedifferentialreferencecanalsobeusedwhenadig­ital zero reading is required when V

is not equal to

IN

zero. This is common in temperature measuringinstru­mentation. A compensating offset voltage can be
applied between analog common and V
ducer output is connected between V

-. The trans-

IN

+ and analog

IN

common.
The internal voltage reference potential available at

analog common will normally be used to supply the
converter's reference. This potential is stable when­ever the supply potential is greater than approximately
7V. In applications where an externally generatedref­erence voltage is desired, refer to Figure 7-1.

FIGURE 7-1: EXTERNAL REF ERENCE

V+

V

REF

V

REF

TC7106A
TC7107A

V+

+

-

6.8V
Zener

I

Z

V+

TC7106A
TC7107A

V

REF

V

REF

Common

b

+

-

20kΩ

V+

6.8kΩ

1.2V
Ref

8.0 DEVICE PIN FUNCTIONAL
DESCRIPTION

FIGURE 8-1: COMMON MODE

VOLTAGE REDUCES
AVAILABLEI NTEG RATOR
SWING (V

Input Buffer

+

V

IN

V

CM

+

–

Where:

R

I

T

VI =

TI = Integration Time

C

R

I

C

R

I

= Integration Capacitor

I

= Integration Resistor

I

COM

I

≠ V

C

I

–

+

Integrator

VCM – V

[

)

IN

V

I

[

IN

4000

=

F

OSC

8.2 Differential Reference
+(Pin36),V

V

REF

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, C
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 refer­ence.The temperaturecoefficient of analog common is
20ppm/°C typically.

-(Pin35)

REF

should be large com-

REF

8.1 Differential Signal Inputs
+(Pin31),VIN-(Pin30)

V

IN

The TC7106A/7017A is designed with true differential
inputs and accepts input signals within the input stage
common mode voltage range ( V
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 V
connectedto analog common (V

In systems where Common mode voltages exist, the
86dB Common mode rejection ratio minimizes error.
Common mode voltages do, however, affect the inte­gratoroutputlevel.Integrator output saturationmustbe
prevented. A worstcase conditionexistsif a large pos­itiveV

existsin conjunction with a full scale negative

CM

differential signal. The negative signal drives the inte­grator output positive along with V
For such applications the integrator output swing can
be reduced below the recommended 2.0V full scale
swing. The integrator output will swing wi thin 0.3V of

). The typical range

CM

) (see Figure 8-2).

COM

(see Figure 8-1).

CM

IN

-is

8.3 AnalogCommon(Pin32)

The analog common pin is set at a voltage potential
approximately3.0VbelowV+. The potentialis between

2.7V and 3.35V below V+. Analog common is tied inter­nally 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 V
inputs to analog common during the auto-zero cycle.
During the reference integrate phase, V
nected to analog common. If V

- is not externally con-

IN

nected t o analog common, a Common mode voltage
exists. This is r ejected by the converter's 86dB Com­mon mode rejection ratio. In battery operation, analog
common and V

- are usually connected, removing

IN

Common mode voltageconcerns.In systems where V­is connected to the power supply ground, or to a given
voltage, analog common should be connected to V

+andVIN-

IN

- is con-

IN

IN

-.

V+ or V-without increasing linearity errors.

DS21455B-page 14



2002 Microchip TechnologyInc.

TC7106/A/TC7107/A

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

VIN- = ANALOG COMMON

Segment

Drive

LCD Display

V+

V-

Powe r

Source

V+

V-

GND

Measured

System

GND

V

V

IN

VIN-

Analog
Common

Theanalogcommonpin servesto settheanalogsection
reference or common point. The TC7106A is specifically
designed to operate from a battery, or in any measure­ment 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
battery life voltage. The common potential has a 0.001%
voltage coefficient and a 15Ω output 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 referencewill be unneces­saryin most cases because of the 50ppm/°C maximum
temperature coefficient. See Internal Voltage Refer­ence discussion.

8.4 TEST (Pin 37)

The TEST pin potential is 5V l ess than V+. TEST may
be used as the negative power supply connection for
external CMOS logic. The TEST pin is tied to the inter­nally generated negative logic supply (Internal Logic
Ground) through a 500Ω resistor in the TC7106A. The
TEST pi n load should be no more than 1mA.

IfTEST is pulled to V+ all segments 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” ver­sion 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 referencefor
the TC7106A/TC7107A.

BUF

+

CAZV

TC7106A

V

-

REF

REF

INT

+V

+

9V

BPPOL

OSC1

OSC3

OSC2
V-V+

FIGURE 8-3: ANALOG COMMON

TEMPERATURE
COEFFICIENT

200

180

No Maximum Specified

160

140

120

100

80

60

40

Temperature Coefficient (ppm/°C)

20

0

Maximum

Limit

Typical

TC

7106A

No

Maximum

Specified

Typical

ICL7106

Maximum

Specified

Typical

ICL7136

FIGURE 8-4: INTERNAL VOLTAGE

REFERENCE
CONNECTION

1

Set V

V-

TC7106A
TC7107A

= 1/2 V

REF

V

REF

V

REF

Analog

Common

FULL SCALE

V+

36

+

V

REF

35

-

32

No

24kΩ

1kΩ



2002 Microchip TechnologyInc. DS21455B-page 15

TC7106/A/TC7107/A

9.0 POWER SUPPLIES

The TC7107A is designed to work from ±5V supplies.
However,if a negativesupply 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 F ROM +5V

V+

CD4009

V+

OSC1
OSC2

OSC3

TC7107A

GND

V-

V- = -3.3V

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 r ange of the converter.

• The signal is less than ±1.5V.

• An external reference is used.

The TSC7660DC to DC converter may be usedtogen­erate -5V from +5V (Figure 9-2).

FIGURE 9-2: NEGATIVE POWER

SUPPLY GENERATION
WITH TC7660

+5V

1

V+

V

REF

V

10µF

LED
DRIVE

TC7107A

8

2

+

4

TC7660

3

5

+

10µF

(-5V)

REF

COM

VIN+

V

IN

GND

V-

26

0.047
1N914

µF

36

+

35

-

32

31

30

-

21

10
µF

1N914

+

–

V

IN

9.1 TC7107 Power Dissipation
Reduction

The TC7107A sinks the LED display current and this
causes heat to build up i n the IC package. If the inter­nal voltage reference i s used, the changing chip tem­perature 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 rela­tionship between output current and output voltage for
a typical TC7107CPL.SinceatypicalLED 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: T C7107 OUTPUT

CURRENT VS. O UTPUT
VOLTAGE

10.000

9.000

8.000

7.000

Output Current (mA)

6.000

2.00 2.50 3.00 3.50 4.00

B

C

Output Voltage (V)

Notice,however,thatoncetheTC7107Aoutputvoltage
is above two volts, the LED current is essentially con­stantas output voltage increases. Reducing the output
voltageby 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 dis­play (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, t he 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
resistorreducesthe 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 sixseg-

A

DS21455B-page 16



2002 Microchip TechnologyInc.

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. There­fore, the resistor will reduce the effect of display dissi­pation on reference voltage drift by about 50%.

The changein LED brightness caused by the r esistor is
almost unnoticeable as more segments turn off. If dis­play brightness remaining steady is very important to
the designer, a diode may be used instead of the
resistor.

FIGURE 9-4: DIODE OR RESISTOR

LIMITSPACKAGE POWER
DISSIPATION

+5V

24kΩ

1kΩ

100

pF

TP5

100

40 TP

TP2

kΩ

TP1

IN

+

1MΩ

TP3

0.01
µF

0.1
µF

30 21

TC7107A

5.1Ω 1/4W

1N4001

Display

-5V

–

150Ω

0.47
µF

0.22

µF

47
kΩ

Display

4

20101

10.2 Light Emitting Diode Display
Sources

Several LED manufacturers supply seven segment
digits with and without decimal point annunciators for
the TC7107A.

Manufacturer Address/Phone Display

Hewlett-Packard
Components

AND 720 Palomar Ave.

640 Page Mill Rd.
Palo Alto, CA 94304

Sunnyvale, CA 94086
408-523-8200

LED

LED

10.3 Decimal Point and Annunciator
Drive

The TEST pin is connected to the internally generated
digitallogicsupplygroundthrougha 500Ω resistor.The
TEST pin may be used as the negative supplyforexter­nal CMOS gate segment drivers. LCD display annunci­ators for decimal points, low battery indication, or
function indication may be added without adding an
additional supply. No more than 1mA should be sup­pliedby the TESTpin; its potential is approximately 5V
below V+ (see Figure 10-1

FIGURE 10-1: DECIMAL POINT DRIVE

V+

).

USING TEST AS L OGIC
GROUND

V+

10.0 TYPICAL APPLICATIONS

10.1 Liquid Cry stal Display Sources

Several manufacturers supply standard LCDs to inter­face with the TC7106A 3-1/2 digit analog-to-digital
converter.

Manufacturer Address/Phone

Crystaloid
Electronics

5282 Hudson Dr.
Hudson, OH 44236
216-655-2429

AND 720 Palomar Ave.

Sunnyvale, CA 94086
408-523-8200

Epson 3415 Kashikawa st.

Torrance, CA 90505
213-534-0360

Hamlin, Inc. 612 E. Lake St.

Lake Mills, WI 53551
414-648-236100

Note: Contact LCD manufacturer for full product listing and

specifications.

Representative

Part Numbers*

C5335,H5535,
T5135, SX440

FE 0201, 0701
FE 0203, 0701
FE 0501

LD-B709BZ
LD-H7992AZ

3902, 3933, 3903

TC7106A

TEST

V+

TC7106A

TEST

BP

BP

21

37

Decimal

Point

Select

4049

4030

GND

V+

GND

To LCD
Decimal
Point

To LCD
Backplane

To LCD
Decimal
Point



2002 Microchip TechnologyInc. DS21455B-page 17

TC7106/A/TC7107/A

y

10.4 Ratiometric Resistance
Measurements

The true differential input and differential reference
make ratiometric reading possible. Typically in a ratio­metric operation, an unknown resistanceis measured,
with respect to a known standard resistance. No accu­rately defined reference voltage is needed.

The unknown resistance is put in series with a known
standard and a current passed through the pair. The
voltagedeveloped across the unknownisappliedtothe
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:

STANDARD

V+

+

REF

-

REF

+

IN

TC7106A

-

IN

RUnknown

------------------------------- x 1000=
RS dardtan

+

LCD Displa

9V

Displayed Reading()

The display will over range for:

R

UNKNOWN

≥ 2xR

FIGURE 10-2: LOW PARTS COUNT

RATIOMETRIC
RESISTANCE
MEASUREMENT

V

R

STANDARD

R

UNKNOWN

V

V

V

Analog
Common

FIGURE 10-3: TEMPERATURE SENSOR

FIGURE 10-4: POSITIVETEMPERATURE

COEFFICIENT RESISTOR
TEMPERATURE SENSOR

9V

+

5.6kΩ 160kΩ

V+ V-

0.7%/°C
PTC

1N914

R

3

20kΩ

20kΩ

R

1

R

2

VIN-

+

V

IN

TC7106A

+

V

REF

-

V

REF

Common

FIGURE 10-5: TC7106A, USING THE

INTERNAL REFERENCE:
200mV FULL SCALE, 3
READINGS-PER-SECOND
(RPS)

To Pin 1

TC7106A

40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21

Set V

100kΩ

100pF

0.1µF

0.47µF

0.22µF

To Display

To Backplane

= 100mV

REF

1kΩ 22kΩ

1MΩ

0.01µF

47kΩ

+

IN

+

–

9V

–

160kΩ 300kΩ 300kΩ

1N4148
Sensor

50kΩ

50kΩ

R

2

DS21455B-page 18

V+ V-

-

V

IN

R

1

+

V

IN

TC7106A

VFS = 2V

+

V

REF

V

-

REF

Common



2002 Microchip TechnologyInc.

TC7106/A/TC7107/A

g

+

FIGURE 10-6: TC7107 INTERNAL

REFERENCE: 200mV
FULL SCALE, 3RPS,

V

-TIEDTOGNDFOR

IN

SINGLE ENDED INPUTS

To Pin 1

TC7107A

40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21

0.1µF

0.47µF

0.22µF

To Display

Set V

100kΩ

100pF

1kΩ 22kΩ

0.01

47kΩ

REF

= 100mV

1MΩ

µF

FIGURE 10-7: CIRCUIT FOR

DEVELOPING UNDER
RANGE AND OVER
RANGE SIGNALS FROM
TC7106A OUTPUTS

O/R

U/R

CD4023
OR 74C10

V+

To Logic

V

CC

CD4077

1

40

TC7106A

2120

O/R = Over Range
U/R = Under Ran

+5V

+

IN

–

-5V

To Logic

V

CC

V-

e

FIGURE 10-8: TC7106/TC7107:

RECOMMENDED
COMPONENT VALUES
FOR 2.00VFULL SCALE

To Pin 1

TC7106A
TC7107A

40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21

0.1µF

0.047µF

0.22µF

To Display

Set V

100kΩ

100pF

25kΩ

470kΩ

0.01

REF

µ

= 1V

24kΩ

1M

F

V

Ω

+

IN

–

V-

FIGURE 10-9: TC7107 OPERATED FROM

SINGLE +5V SUPPLY

To PIn 1

40
39
38
37
36
35
34
33

TC7107A

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

32
31
30
29
28
27
26
25
24
23
22
21

0.1µF

0.47µF

0.22µF

To Display

100kΩ

100pF

1kΩ

0.01µF

47kΩ

Set V

10kΩ

1.2V

REF

= 100mV

10kΩ

1M

Ω

V+

IN

–



2002 Microchip TechnologyInc. DS21455B-page 19

TC7106/A/TC7107/A

y

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

–

+

1µF

+

–

1

2

3

4

AD636

5

6

7

V

IN

9MΩ

900kΩ

90kΩ

10kΩ

200mV

2V

20V

200V

COM

C1 = 3 - 10pF Variable
C2 = 132pF Variable

IN4148

0.02

47kΩ

10%

µF

1W

10kΩ

1MΩ

1MΩ

6.8µF

20kΩ

10%

9V

+

1

14

13

24kΩ

12

11

1kΩ

10

9

8

2.2µF

1MΩ 10%

0.01
µF

V+

36

V

REF

35

V

REF

32

Analog Common

31

V

IN

30

V

IN

26

V-

26

V-

TC7106A

+

-

+

-

27

29

28

40

38

39

FIGURE 10-11: INTEGRATED CIRCUIT TEMPERATURE SENSOR

9V

2 1

V+

REF02

GND

4 26

V

OUT

ADJ

TEMP

Constant 5V

6

5

3

Temperature
Dependent
Output

51kΩ 5.1kΩ

R

4

NC

1.3k

TC911

R

5

2

–

8

3

1

+

V

4

1.86V @
25°C

OUT

50kΩ

R

2

=

50kΩ

R

1

+

V

REF

TC7106A

V

-

REF

V

FS

V

-

IN

V

+

IN

Common

V+

= 2.00V

V-

SEG
DRIVE

LCD Displa

BP

DS21455B-page 20



2002 Microchip TechnologyInc.

11.0 PACKAGING INFORMATION

11.1 Package Marking Information

Package marking data not available at this time.

11.2 Taping Form

Component Taping Orientation for 44-Pin PLCC Devices

User Direction of Feed

PIN 1

TC7106/A/TC7107/A

W

P

Standard Reel Component Orientation
for TR Suffix Device

Carrier Tape, Number of Components Per Reel and Reel Size

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

44-Pin PLCC 32 mm 24 mm 500 13 in

Note: Drawing does not represent total number of pins.

Component Taping Orientation for 44-Pin PQFP Devices

User Direction of Feed

PIN 1

W

P

Standard Reel Component Orientation
for TR Suffix Device

Carrier Tape, Number of Components Per Reel and Reel Size

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

44-Pin PQFP 24 mm 16 mm 500 13 in

Note: Drawing does not represent total number of pins.



2002 Microchip TechnologyInc. DS21455B-page 21

TC7106/A/TC7107/A

11.3 Package Dimensions

40-Pin PDIP (Wide)

.200 (5.08)
.140 (3.56)

.150 (3.81)
.115 (2.92)

.110 (2.79)
.090 (2.29)

2.065 (52.45)

2.027 (51.49)

.070 (1.78)
.045 (1.14)

.022 (0.56)
.015 (0.38)

PIN 1

.555 (14.10)
.530 (13.46)

.040 (1.02)
.020 (0.51)

.015 (0.38)
.008 (0.20)

.610 (15.49)
.590 (14.99)

3° MIN.

.700 (17.78)
.610 (15.50)

Dimensions: inches (mm)

40-Pin CERDIP (Wide)

.098 (2.49) MAX.

2.070 (52.58)

2.030 (51.56)

.210 (5.33)
.170 (4.32)

.200 (5.08)
.125 (3.18)

.110 (2.79)
.090 (2.29)

.065 (1.65)
.045 (1.14)

.020 (0.51)
.016 (0.41)

PIN 1

.540 (13.72)
.510 (12.95)

.030 (0.76) MIN.

.060 (1.52)
.020 (0.51)

.150 (3.81)

MIN.

.015 (0.38)
.008 (0.20)

.620 (15.75)
.590 (15.00)

3° MIN.

.700 (17.78)
.620 (15.75)

Dimensions: inches (mm)

DS21455B-page 22



2002 Microchip TechnologyInc.

11.3 Package Dimensions (Continued)

(

TC7106/A/TC7107/A

44-Pin PLCC

.695 (17.65)
.685 (17.40)

.656 (16.66)
.650 (16.51)

44-Pin PQFP

.656 (16.66)
.650 (16.51)

.695 (17.65)
.685 (17.40)

PIN 1

.050 (1.27) TYP.

.021 (0.53)
.013 (0.33)

.630 (16.00)
.591 (15.00)

.032 (0.81)
.026 (0.66)

.020 (0.51) MIN.

.120 (3.05)
.090 (2.29)

.180 (4.57)
.165 (4.19)

Dimensions: inches (mm)

7° MAX.

PIN 1

.018 (0.45)
.012 (0.30)

.031 (0.80) TYP.

.398 (10.10)

.390 (9.90)

.557 (14.15)
.537 (13.65)

.398 (10.10)

.390 (9.90)

.557 (14.15)
.537 (13.65)

.009 (0.23)
.005 (0.13)

.096

.041 (1.03)
.026 (0.65)

.010 (0.25) TYP.

.083 (2.10)
.075 (1.90)

2.45) MAX.

Dimensions: inches (mm)



2002 Microchip TechnologyInc. DS21455B-page 23

TC7106/A/TC7107/A

PRODUCT IDENTIFICATION SYSTEM

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

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):

SALES AND SUPPORT

Data Sheets

Products supportedby a preliminaryData Sheet may have an errata sheet describing minor operational differences and recom­mendedworkarounds.To determine if an erratasheetexists for a particular device,please contact one of the following:

1. Your local Microchip sales office

2. TheMicrochip CorporateLiteratureCenter U.S. FAX:[phone]

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

}

Pleasespecify which device, revision of silicon and Data Sheet (includeLiterature#) you are using.

New Customer Notification System

Register on our web site (www.microchip.com/cn) to r eceive the most current information on our products.

DS21455B-page 24



2002 Microchip TechnologyInc.

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 com­ponents in life support systems is not authorized except with
express written approval by Microchip. No licenses are con­veyed, implicitly or otherwise, under any intellectual property
rights.

Trademarks

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

EELOQ,microID,MPLAB,PIC,PICmicro,PICMASTER,

PICSTART, PRO MATE, SEEVAL and The Embedded Control
SolutionsCompany areregiste red trademarksof MicrochipTech­nologyIncorp or ated in the U.S.A. and other countries .

dsPIC, ECONOMONITOR, Fa nSense, FlexROM, fuzzyLAB,
In-Circuit Serial Programming, ICSP, ICEPIC, microPort,
Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM,
MXDEV, PICC, PICDEM, PICDEM.net, rfPIC, Select Mode
and TotalEndurancearetrademarksofMicrochipTechnology
Incorporated in the U.S.A.

Serialized Quick Turn Programming (SQTP) is a service mark
of Microchip TechnologyIncorporated in t he U.S.A.

All other trademarks mentioned herein are property of their
respective companies.

© 2002, Microchip T echnology Incorporated, Printed in the
U.S.A., All Rights Reserved.

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
devices, Serial EEPROMs, microperipherals,
non-volatile memory and analog products. In
addition, Microchip’s quality system for the
design and manufacture of development
systemsisISO 9001certified.



2002 Microchip TechnologyInc. DS21455B-page 25

8-bit MCUs, KEELOQ®code hopping

WORLDWIDE SALES AND SERVICE

AMERICAS

Corporate Office

2355 West Chandler Blvd.
Chandler, AZ 85224-6199
Tel: [phone] Fax: [phone]
Technical Support: 480-792-7627
Web Address: http://www.microchip.com

Rocky Mountain

2355 West Chandler Blvd.
Chandler, AZ 85224-6199
Tel: [phone] Fax: [phone]

Atlanta

500 Sugar Mill Road, Suite 200B
Atlanta, GA 30350
Tel: [phone] Fax: [phone]

Boston

2 Lan Drive, Suite 120
Westford, MA 01886
Tel: [phone] Fax: [phone]

Chicago

333 Pierce Road, Suite 180
Itasca, IL 60143
Tel: [phone] Fax: [phone]

Dallas

4570 Westgrove Drive, Suite 160
Addison, TX 75001
Tel: [phone] Fax: [phone]

Detroit

Tri-Atria Office Building
32255 Northwestern Highway, Suite 190
Farmington Hills, MI 48334
Tel: [phone] Fax: [phone]

Kokomo

2767 S. Albright Road
Kokomo, Indiana 46902
Tel: [phone] Fax: [phone]

Los Angeles

18201 Von Karman, Suite 1090
Irvine, CA 92612
Tel: [phone] Fax: [phone]

New York

150 Motor Parkway, Suite 202
Hauppauge, NY 11788
Tel: [phone] Fax: [phone]

San Jose

Microchip Technology Inc.
2107 North First Street, Suite 590
San Jose, CA 95131
Tel: [phone] Fax: [phone]

Toronto

6285 Northam Drive, Suite 108
Mississauga, Ontario L4V 1X5, Canada
Tel: [phone] Fax: [phone]

ASIA/PACIFIC

Australia

Microchip Technology Australia Pty Ltd
Suite 22, 41 Rawson Street
Epping 2121, NSW
Australia
Tel: [phone] Fax: [phone]

China - Beijing

Microchip Tec hnology Consulting (Shanghai)
Co., Ltd., Beijing Liaison Office
Unit 915
Bei Hai Wan Tai Bldg.
No. 6 Chaoyangmen Beidajie
Beijing, 100027, No. China
Tel: [phone] Fax: [phone]

China - Chengdu

Microchip Tec hnology Consulting (Shanghai)
Co., Ltd., Chengdu Liaison Office
Rm. 2401, 24th Floor,
Ming Xing Financial Tower
No. 88 TIDU Street
Chengdu 610016, China
Tel: [phone] Fax: [phone]

China - Fuzhou

Microchip Tec hnology Consulting (Shanghai)
Co., Ltd., Fuzhou Liaison Office
Unit 28F, World Trade Plaza
No. 71 Wusi Road
Fuzhou 350001, China
Tel: [phone] Fax: [phone]

China - Shanghai

Microchip Tec hnology Consulting (Shanghai)
Co., Ltd.
Room 701, Bldg. B
Far East International Plaza
No. 317 Xian Xia Road
Shanghai, 200051
Tel: [phone] Fax: [phone]

China - Shenzhen

Microchip Tec hnology Consulting (Shanghai)
Co., Ltd., Shenzhen Liaison Office
Rm. 1315, 13/F , Shenzhen Kerry Centre,
Renminnan Lu
Shenzhen 518001, China
Tel: [phone] Fax: [phone]

Hong Kong

Microchip Technology Hongkong Ltd.
Unit 901-6, Tower 2, Metroplaza
223 Hing Fong Road
Kwai Fong, N.T., Hong Kong
Tel: [phone] Fax: [phone]

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: [phone] Fax: [phone]

Japan

Microchip Technology Japan K.K.
Benex S-1 6F
3-18-20, Shinyokohama
Kohoku-Ku, Yokohama-shi
Kanagawa, 222-0033, Japan
Tel: [phone] Fax: [phone]

Korea

Microchip Technology Korea
168-1, Youngbo Bldg. 3 Floor
Samsung-Dong, Kangnam-Ku
Seoul, Korea 135-882
Tel: [phone] Fax: [phone]

Singapore

Microchip Technology Singapore Pte Ltd.
200 Middle Road
#07-02 Prime Centre
Singapore, 188980
Tel: [phone] Fax: [phone]

Taiwan

Microchip Technology Taiwan
11F-3, No. 207
Tung HuaNorth Road
Taipei, 105, Taiwan
Tel: [phone] Fax: [phone]

EUROPE

Denmark

Microchip Technology Nordic ApS
Regus Business Centre
Lautrup hoj 1-3
Ballerup DK-2750 Denmark
Tel: [phone] Fax: [phone]

France

Microchip Technology SARL
Parc d’Activite du Moulin de Massy
43 Rue du Saule Trapu
Batiment A - ler Etage
91300 Massy, France
Tel: [phone] Fax: [phone]

Germany

Microchip Technology GmbH
Gustav-Heinemann Ring 125
D-81739 Munich, Germany
Tel: [phone] Fax: [phone]

Italy

Microchip Technology SRL
Centro Direzionale Colleoni
Palazzo Taurus 1 V. Le Colleoni 1
20041 Agrate Brianza
Milan, Italy
Tel: [phone] Fax: [phone]

United Kingdom

Arizona Microchip Technology Ltd.
505 Eskdale Road
Winnersh Triangle
Wokingham
Berkshire, EnglandRG41 5TU
Tel: [phone] Fax: [phone]

03/01/02

DS21455B-page 26

*DS21455B*



2002 Microchip Technology Inc.