TC7116CLW_技术文档

TC7116/A/TC7117/A

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

Features

General Description

• Low Temperature Drift Internal Reference

- TC7116/TC7117 80 ppm/°C Typ.

- TC7116A/TC7117A 20 ppm/°C Typ.

• Display Hold Function

The TC7116A/TC7117A are 3-1/2 digit CMOS analog-

to-digital converters (ADCs) containing all the active

components necessary to construct a 0.05% resolution

measurement system. Seven-segment decoders,

polarity and digit drivers, voltage reference, and clock

circuit are integrated on-chip. The TC7116A drives liq-

uid crystal displays (LCDs) and includes a backplane

driver. The TC7117A drives common anode light emit-

ting diode (LED) displays directly with an 8mA drive

current per segment.

• Directly Drives LCD or LED Display

• Zero Reading with Zero Input

• Low Noise for Stable Display

- 2V or 200mV Full Scale Range (FSR)

• Auto-Zero Cycle Eliminates Need for Zero

• Adjustment Potentiometer

These devices incorporate a display hold (HLDR) func-

tion. The displayed reading remains indefinitely, as

long as HLDR is held high. Conversions continue, but

output data display latches are not updated. The refer-

• True Polarity Indication for Precision Null

Applications

• Convenient 9V Battery Operation:

(TC7116/TC7116A)

• High Impedance CMOS Differential Inputs: 10¹²Ω

ence low input (V

-) is not available, as it is with the

REF

TC7106/7107. V

- is tied internally to analog com-

REF

mon in the TC7116A/7117A devices.

• Low Power Operation: 10mW

The TC7116A/7117A 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

Applications

• Thermometry

12

offer 1pA leakage current and a 10 Ω input imped-

• Bridge Readouts: Strain Gauges, Load Cells,

Null Detectors

ance. The 15µV

noise performance enables a “rock

P-P

solid” reading. The auto-zero cycle ensures a zero dis-

play reading with a 0V input.

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

• Digital Scales, Process Monitors

• Portable Instrumentation

The TC7116A and TC7117A feature a precision, low

drift internal reference, and are functionally identical to

the TC7116/TC7117. A low drift external reference is

not normally required with the TC7116A/TC7117A.

Device Selection Table

Package Code

Package

Temperature Range

CPL

IJL

40-Pin PDIP

40-Pin CERDIP

44-Pin PQFP

44-Pin PLCC

0°C to +70°C

-25°C to +85°C

0°C to +70°C

CKW

CLW

2002 Microchip Technology Inc.

DS21457B-page 1

TC7116/A/TC7117/A

Package Type

40-Pin PDIP

40-Pin CERDIP

40

39

38

37

36

35

34

33

32

31

30

HLDR

OSC1

OSC2

OSC3

TEST

1

2

40

39

38

37

36

35

34

33

32

31

30

HLDR

OSC1

OSC2

OSC3

TEST

1

2

D

1

D

1

C

1

3

C

1

3

B

1

4

B

1

4

A

1

5

1's

V

+

A

1

5

1's

V

+

REF

F

1

6

V+

C

F

1

6

V+

C

1

G

1

+

-

7

G

+

-

7

REF

E

1

C

8

E

1

C

8

REF

TC7116CPL

TC7116ACPL

TC7117CPL

TC7117ACPL

TC7116IJL

TC7116AIJL

TC7117IJL

TC7117AIJL

9

D

2

COMMON

9

D

2

COMMON

10

11

12

13

14

15

16

17

18

19

20

C

2

V

+

-

10

11

12

13

14

15

16

17

18

19

20

C

2

V

+

-

IN

B

2

B

2

IN

10's

A

2

29 C

AZ

A

2

29 C

AZ

F

2

28

27

26

25

24

23

22

21

V

F

28

V

BUFF

2

BUFF

INT

E

2

E

2

27

V

INT

D

3

V-

G

26

D

3

V-

B

3

B

3

25

24

23

22

21

G

2

100's

F

C

F

3

C

A

3

100's

A

E

3

AB

G

1000's

AB

G

1000's

4

3

4

3

POL

(Minus Sign)

BP/GND

(TC7116/7117)

POL

(Minus Sign)

BP/GND

(TC7116/7117)

(TC7116A/TC7117A)

44-Pin PLCC

44-Pin PQFP

6

5

4

3

2

1

44 43 42 41 40

44 43 42 41 40 39 38 37 36 35 34

33

1

2

3

4

5

6

7

NC

F

G

E

7

39

38

37

36

35

34

33

32

31

30

29

V+

C

1

32 G

3

+

-

8

REF

1

C

31

30 A

TEST

OSC3

NC

C

9

REF

1

D

10

11

12

13

14

15

16

17

COMMON

2

29

28

27

26

25

24

23

G

3

C

V

+

TC7116CKW

TC7116ACKW

TC7117CKW

TC7117ACKW

2

IN

NC

TC7116CLW

TC7116ACLW

TC7117CLW

TC7117ACLW

BP/

OSC2

OSC1

NC

B2

GND

POL

V

-

IN

AB

4

HLDR 8

D

A

2

C

V

AZ

E

3

9

1

F

2

BUFF

INT

F

3

10

11

C

B

E

2

V

B

3

D

3

1

V-

25 26 27 28

19 20 21 22

12 13 14 15 16 17 18

18 19 20 21 22 23 24

Note 1: NC = No internal connection.

2: Pins 9, 25, 40 and 56 are connected to the die substrate. The potential at these pins is approximately V+. No external

connections should be made.

DS21457B-page 2

2002 Microchip Technology Inc.

TC7116/A/TC7117/A

Typical Application

TC7116/A

TC7117/A

Display

Hold

0.1µF

LCD Display (TC7116/7116A)

or Common Anode LED Display

(TC7117/7117A)

33

1

34

HLDR

-

REF

C

+ C

REF

1MΩ

31

Segment

2–19

+

V

+

IN

Drive

22–25

Analog

Input

–

0.01µF

20

POL

30

32

V

-

IN

Backplane Drive

Minus Sign

21

35

BP/GND

V+

ANALOG

COMMON

24kΩ

28

V

C

BUFF

+

47kΩ

V

9V

36

26

REF

0.47µF

29

V

+

REF

1kΩ

AZ

100mV

0.22µF

27

V

INT

V-

OSC2 OSC3 OSC1

39 38

To Analog

Common (Pin 32)

C

40

OSC

R

OSC

100pF

3 Conversions Per Second

100kΩ

2002 Microchip Technology Inc.

DS21457B-page 3

TC7116/A/TC7117/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 affect device reliability.

1.0

ELECTRICAL

CHARACTERISTICS

Absolute Maximum Ratings*

Supply Voltage:

TC7116/TC7116A (V+ to V-) ...........................15V

TC7117/TC7117A (V+ to GND) .......................+6V

V- to GND.........................................................-9V

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

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

Clock Input:

TC7116/TC7116A............................... TEST to V+

TC7117/TC7117A.................................GND to V+

Package Power Dissipation; T ≤ 70°C (Note 2)

A

40-Pin CDIP ................................................2.29W

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

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

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

Operating Temperature:

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

I (Commercial) Device.................... 0°C to +70°C

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

TC7116/A AND TC7117/A ELECTRICAL SPECIFICATIONS

Electrical Characteristics: Unless otherwise noted, specifications apply to both the TC7116/A and TC7117/A at T_A= 25°C,

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

Symbol

Parameter

Zero Input Reading

Min

Typ

Max

Unit

Test Conditions

Z_IR

—

±0

—

Digital V_IN= 0V

Reading Full Scale = 200mV

Ratiometric Reading

999

-1

999/1000

±0.2

1000

+1

Digital V_IN= V_REF

Reading V_REF= 100mV

R/O

Rollover Error (Difference in Reading for

Equal Positive and Negative

Counts V_IN- = + V_IN+ ≅ 200mV

or ≈ 2V

Readings Near Full Scale)

Linearity (Maximum Deviation from Best

Straight Line Fit)

-1

—

±0.2

50

+1

—

Counts Full Scale = 200mV or 2V

CMRR

e_N

Common Mode Rejection Ratio

(Note 3)

µV/V

µV

V_CM= ±1V, V_IN= 0V

Full Scale = 200mV

Noise (Peak to Peak 95% of Time)

15

V_IN= 0V

Full Scale = 200mV

I_L

Leakage Current at Input

Zero Reading Drift

—

1

10

1

pA

V_IN= 0V

0.2

µV/°C V_IN= 0V

“C” Device = 0°C to +70°C

µV/°C “I” Device = -25°C to +85°C

—

1.0

2

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.

5: The TC7116/TC7116A logic inputs have an internal pull-down resistor connected from HLDR, Pin 1 to TEST, Pin 37. The

TC7117/TC7117A logic inputs have an internal pull-down resistor connected from HLDR, Pin 1 to GND, Pin 21.

DS21457B-page 4

2002 Microchip Technology Inc.

TC7116/A/TC7117/A

TC7116/A AND TC7117/A ELECTRICAL SPECIFICATIONS (CONTINUED)

Electrical Characteristics: Unless otherwise noted, specifications apply to both the TC7116/A and TC7117/A at T_A= 25°C,

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

f

Symbol

Parameter

Min

Typ

Max

Unit

Test Conditions

TC_SF

Scale Factor Temperature Coefficient

—

1

5

ppm/°C V_IN= 199mV,

“C” Device = 0°C to +70°C

(Ext. Ref = 0ppm°C)

—

30

—

70

—

20

—

ppm/°C “I” Device = -25°C to +85°C

Input Resistance, Pin 1

V_IL,Pin 1

kΩ

V

(Note 5)

—

Test + 1.5

GND + 1.5

—

TC7116/A Only

TC7117/A Only

Both

V_IL,Pin 1

—

V⁺- 1.5

—

V

V_IH,Pin 1

—

V

I_DD

Supply Current (Does not Include LED

Current for TC7117/A)

—

0.8

1.8

mA

V_IN= 0V

V_C

Analog Common Voltage

(with Respect to Positive Supply)

2.4

—

3.05

3.35

V

25kΩ Between Common

and Positive Supply

V_CTC

Temperature Coefficient of Analog

Common (with Respect to Positive

Supply)

—

20

80

—

50

—

“C” Device: 0°C to +70°C

ppm/°C TC7116A/TC7117A

ppm/°C TC7116/TC7117

V_SD

V_BD

TC7116/TC7117A ONLY Peak to Peak

Segment Drive Voltage

4

5

8

6

V

V+ to V- = 9V

(Note 4)

TC7116A/TC7116A ONLY Peak to Peak

Backplane Drive Voltage

6

V

V+ to V- = 9V

(Note 4)

TC7117/TC7117A ONLY

Segment Sinking Current

(Except Pin 19)

—

mA

V+ = 5.0V

Segment Voltage = 3V

TC7117/TC7117A ONLY

10

16

—

mA

V+ = 5.0V

Segment Sinking Current (Pin 19 Only)

Segment Voltage = 3V

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.

5: The TC7116/TC7116A logic inputs have an internal pull-down resistor connected from HLDR, Pin 1 to TEST, Pin 37. The

TC7117/TC7117A logic inputs have an internal pull-down resistor connected from HLDR, Pin 1 to GND, Pin 21.

2002 Microchip Technology Inc.

DS21457B-page 5

TC7116/A/TC7117/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)

(40-Pin CERDIP)

Pin Number

Symbol

Description

(44-Pin PQFP)

1

2

8

HLDR

D₁

Hold pin, Logic 1 holds present display reading.

Activates the D section of the units display.

Activates the C section of the units display.

Activates the B section of the units display.

Activates the A section of the units display.

Activates the F section of the units display.

Activates the G section of the units display.

Activates the E section of the units display.

Activates the D section of the tens display.

Activates the C section of the tens display.

Activates the B section of the tens display.

Activates the A section of the tens display.

Activates the F section of the tens display.

Activates the E section of the tens display.

Activates the D section of the hundreds display.

Activates the B section of the hundreds display.

Activates the F section of the hundreds display.

Activates the E section of the hundreds display.

Activates both halves of the 1 in the thousands display.

Activates the negative polarity display.

9

3

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

C₁

4

B₁

5

A₁

6

F₁

7

G₁

E₁

8

9

D₂

10

11

12

13

14

15

16

17

18

19

20

21

C₂

B₂

A₂

F₂

E₂

D₃

B₃

F₃

E₃

AB₄

POL

BP/

GND

LCD backplane drive output (TC7116/TC7116A). Digital ground

(TC7117/TC7117A).

22

23

24

25

26

27

29

30

31

32

34

35

G₃

A₃

Activates the G section of the hundreds display.

Activates the A section of the hundreds display.

Activates the C section of the hundreds display.

Activates the G section of the tens display.

Negative power supply voltage.

C₃

G₂

V-

V_INT

Integrator output. Connection point for integration capacitor.

See Section 4.3, Integrating Capacitor for more details.

28

29

36

37

V_BUFF

C_AZ

Integration resistor connection. Use a 47kΩ resistor for a 200mV full scale range

and a 470kΩ resistor for 2V full scale range.

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 4.1, Auto-Zero Capacitor for more details.

30

31

32

38

39

40

V_IN

-

The analog LOW input is connected to this pin.

+

The analog HIGH input signal is connected to this pin.

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

operation, or in systems where the input signal is referenced to the power supply.

It also acts as a reference voltage source. See Section 3.1.6, Analog Common

for more details.

33

34

41

42

C_REF

-

See Pin 34.

+

A 0.1µF capacitor is used in most applications. If a large Common mode voltage

exists (for example, the V_IN- 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.

DS21457B-page 6

2002 Microchip Technology Inc.

TC7116/A/TC7117/A

TABLE 2-1:

PIN FUNCTION TABLE (CONTINUED)

Pin Number

(40-Pin PDIP)

(40-Pin CERDIP)

Pin Number

Symbol

Description

(44-Pin PQFP)

35

36

43

44

V+

Positive Power Supply Voltage.

V_REF

+

The analog input required to generate a full scale output (1999 counts). Place

100mV between Pins 32 and 36 for 199.9mV full scale. Place 1V between

Pins 35 and 36 for 2V full scale. See Section 4.6, Reference Voltage.

37

3

TEST

Lamp test. When pulled HIGH (to V+), all segments will be turned on and the dis-

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

generated decimal points. See Section 3.1.7, TEST for additional information.

38

39

40

4

6

7

OSC3

OSC2

OSC1

See Pin 40.

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 100kΩ resistor and a 100pF capaci-

tor. The 100kΩ resistor is tied to Pin 39 and the 100pF capacitor is tied to Pin 38.

3.1.2

SIGNAL INTEGRATE PHASE

3.0

DETAILED DESCRIPTION

The auto-zero loop is opened, the internal short is

removed, and the internal high and low inputs are con-

nected to the external pins. The converter then inte-

(All Pin Designations Refer to 40-Pin PDIP.)

3.1

Analog Section

grates the differential voltages between V + and V

-

IN

Figure 3-1 shows the block diagram of the analog sec-

tion for the TC7116/TC7116A and TC7117/TC7117A.

Each measurement cycle is divided into three phases:

(1) Auto-Zero (AZ), (2) Signal Integrate (INT), and

(3) Reference Integrate (REF), or De-integrate (DE).

for a fixed time. This differential voltage can be within a

wide Common mode range: 1V of either supply. How-

ever, if the input signal has no return with respect to the

converter power supply, V - can be tied to analog

IN

common to establish the correct Common mode volt-

age. At the end of this phase, the polarity of the

integrated signal is determined.

3.1.1

AUTO-ZERO PHASE

High and low inputs are disconnected from the pins and

internally shorted to analog common. The reference

capacitor is charged to the reference voltage. A feed-

back loop is closed around the system to charge the

auto-zero capacitor (C ) to compensate for offset volt-

AZ

ages in the buffer amplifier, integrator, and comparator.

Since the comparator is included in the loop, AZ accu-

racy is limited only by system noise. The offset referred

to the input is less than 10µV.

2002 Microchip Technology Inc.

DS21457B-page 7

TC7116/A/TC7117/A

FIGURE 3-1:

ANALOG SECTION OF TC7116/TC7117A AND TC7117/TC7117A

C

V

AZ

INT

R

C

+

INT

V+

35

REF

C

REF

+

V

C

-

V

BUFF

REF

INT

REF

Auto-Zero

29

34

36

33

28

27

V+

–

+

Integrator

AZ

10µA

Low

Temp.

Drift

–

+

To

Digital

Section

31

V

IN

+

DE

(–±

DE

(+±

INT

AZ

Zener

AZ

–

+

V

REF

Comparator

DE (+±

AZ & DE (± ±

32

30

DE (–±

TC7116

TC7116A

TC7117

Analog

Common

V+ -3V

V

-

IN

TC7117A

26

INT

V-

3.1.3

REFERENCE INTEGRATE PHASE

3.1.6

ANALOG COMMON

The final phase is reference integrate, or de-integrate.

Input low is internally connected to analog common

and input high is connected across the previously

charged reference 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 for the output to return to

zero is proportional to the input signal. The digital

reading displayed is:

This pin is included primarily to set the Common mode

voltage for battery operation (TC7116/TC7116A), or for

any system where the input signals are floating, with

respect to the power supply. The analog common pin

sets a voltage approximately 2.8V more negative than

the positive supply. This is selected to give a minimum

end of life battery voltage of about 6V. However, analog

common has some attributes of a reference voltage.

When the total supply voltage is large enough to cause

the zener to regulate (>7V), the analog common volt-

age will have a low voltage coefficient (0.001%), low

output impedance (≅15Ω), and a temperature coeffi-

cient of less than 20ppm/°C, typically, and 50 ppm max-

imum. The TC7116/TC7117 temperature coefficients

are typically 80ppm/°C.

EQUATION 3-1:

V

IN

1000 =

V

REF

3.1.4

REFERENCE

An external reference may be used, if necessary, as

shown in Figure 3-2.

The positive reference voltage (V

analog common.

+) is referred to

REF

FIGURE 3-2:

USING AN EXTERNAL

REFERENCE

3.1.5

DIFFERENTIAL INPUT

This input can accept differential voltages anywhere

within the Common mode range of the input amplifier

or, specifically, from 1V below the positive supply to 1V

above the negative supply. In this range, the system

has a CMRR of 86dB, typical. However, since the inte-

grator also swings with the Common mode voltage,

care must be exercised to ensure that the integrator

output does not saturate. A worst case condition would

be a large, positive Common mode voltage with a near

full scale negative differential input voltage. The nega-

tive input signal drives the integrator positive, when

most of its swing has been used up by the positive

Common mode voltage. For these critical applications,

the integrator swing can be reduced to less than the

recommended 2V full scale swing with little loss of

accuracy. The integrator output can swing within 0.3V

of either supply without loss of linearity.

V+

6.8kΩ

TC7116

TC7116A

TC7117

TC7117A

20kΩ

V

+

REF

1.2V REF

COMMON

DS21457B-page 8

2002 Microchip Technology Inc.

TC7116/A/TC7117/A

Analog common is also used as V - return during

FIGURE 3-4:

EXCLUSIVE “OR” GATE

FOR DECIMAL POINT

DRIVE

IN

auto-zero and de-integrate. If V - is different from ana-

IN

log common, a Common mode voltage exists in the

system and is taken care of by the excellent CMRR of

the converter. However, in some applications, V - will

V+

IN

be set at a fixed, known voltage (power supply common

for instance). In this application, analog common

should be tied to the same point, thus removing the

Common mode voltage from the converter. The same

holds true for the reference voltage; if it can be conve-

niently referenced to analog common, it should be.

This removes the Common mode voltage from the

reference system.

V+

BP

TC7116

TC7116A

To LCD

Decimal

Point

Decimal

Point

Select

4030

GND

Within the IC, analog common is tied to an N-channel

FET, that can sink 30mA or more of current to hold the

voltage 3V below the positive supply (when a load is

trying to pull the analog common line positive). How-

ever, there is only 10µA of source current, so analog

common may easily be tied to a more negative voltage,

thus overriding the internal reference.

TEST

3.2

Digital Section

Figure 3-5 and Figure 3-6 show the digital section for

TC7116/TC7116A and TC7117/TC7117A, respectively.

For the TC7116/TC7116A (Figure 3-5), an internal dig-

ital ground is generated from a 6V zener diode and a

large P-channel source follower. This supply is made

stiff to absorb the relative large capacitive currents

when the backplane (BP) voltage is switched. The BP

frequency is the clock frequency 4800. For 3 readings

per second, this is a 60Hz square wave with a nominal

amplitude of 5V. The segments are driven at the same

frequency and amplitude, and are in phase with BP

when OFF, but out of phase when ON. In all cases,

negligible DC voltage exists across the segments.

3.1.7

TEST

The TEST pin serves two functions. On the TC7117/

TC7117A, it is coupled to the internally generated digi-

tal supply through a 500Ω resistor. Thus, it can be used

as a negative supply for externally generated segment

drivers, such as decimal points, or any other presenta-

tion the user may want to include on the LCD.

(Figure 3-3 and Figure 3-4 show such an application.)

No more than a 1mA load should be applied.

The second function is a "lamp test." When TEST is

pulled HIGH (to V+), all segments will be turned ON

and the display should read -1888. The TEST pin will

sink about 10mA under these conditions.

Figure 3-6 is the digital section of the TC7117/

TC7117A. It is identical to the TC7116/TC7116A,

except that the regulated supply and BP 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. The

TC7117/TC7117A are designed to drive common

anode LED displays.

FIGURE 3-3:

SIMPLE INVERTER FOR

FIXED DECIMAL POINT

V+

In both devices, the polarity indication is ON for analog

inputs. If V - and V + are reversed, this indication can

be reversed also, if desired.

IN

TC7116

TC7116A

4049

BP

To LCD

Decimal

21

37

Point

GND

TEST

To LCD

Backplane

2002 Microchip Technology Inc.

DS21457B-page 9

TC7116/A/TC7117/A

FIGURE 3-5:

TC7116/TC7116A DIGITAL SECTION

TC7116

TC7116A

Backplane

21

LCD Phase Driver

Typical Segment Output

0.5mA

V+

7-Segment

Decode

7-Segment

Decode

7-Segment

Decode

÷

200

Segment

Output

Latch

Tens

2mA

Internal Digital Ground

Units

Hundreds

Thousands

To Switch Drivers

From Comparator Output

35

37

V+

~70kΩ

= 1V

Clock

6.2V

500Ω

÷

4

Logic Control

TEST

V-

V

TH

26

Internal Digital Ground

40

39

38

1

OSC1

OSC2

OSC3

HLDR

To achieve maximum rejection of 60Hz pickup, the sig-

nal integrate cycle should be a multiple of 60Hz. Oscil-

lator frequencies of 240kHz, 120kHz, 80kHz, 60kHz,

48kHz, 40kHz, etc. should be selected. For 50Hz rejec-

tion, oscillator frequencies of 200kHz, 100kHz,

66-2/3kHz, 50kHz, 40kHz, etc. would be suitable. Note

that 40kHz (2.5 readings per second) will reject both

50Hz and 60Hz.

3.2.1

SYSTEM TIMING

The clocking method used for the TC7116/TC7116A

and TC7117/TC7117A is shown in Figure 3-6. Three

clocking methods may be used:

1. An external oscillator connected to Pin 40.

2. A crystal between Pins 39 and 40.

3. An RC network using all three pins.

The oscillator frequency is ÷4 before it clocks the

decade counters. It is then further divided to form the

three convert cycle phases: Signal Integrate (1000

counts), Reference De-integrate (0 to 2000 counts),

and Auto-Zero (1000 to 3000 counts). For signals less

than full scale, auto-zero gets the unused portion of ref-

erence de-integrate. This makes a complete measure

cycle of 4000 (16,000 clock pulses), independent of

input voltage. For 3 readings per second, an oscillator

frequency of 48kHz would be used.

3.2.2

HOLD READING INPUT

When HLDR is at a logic HIGH, the latch will not be

updated. Analog-to-digital conversions will continue,

but will not be updated until HLDR is returned to LOW.

To continuously update the display, connect to TEST

(TC7116/TC7116A) or GROUND (TC7117/TC7117A),

or disconnect. This input is CMOS compatible with

70kΩ typical resistance to TEST (TC7116/TC7116A) or

GROUND (TC7117/TC7117A).

DS21457B-page 10

2002 Microchip Technology Inc.

TC7116/A/TC7117/A

FIGURE 3-6:

TC7117/TC711A DIGITAL SECTION

TC7117

TC7117A

Typical Segment Output

V+

7-Segment 7-Segment

7-Segment

Decode

0.5mA

Decode

To

Segment

8mA

Latch

Digital Ground

Internal Digital Ground

Units

Thousands

Hundreds

Tens

To Switch Drivers

From Comparator Output

V+

35

37

V+

TEST

Clock

÷

4

Control Logic

500Ω

21

Digital

GND

40

OSC1

39

OSC2

38

OSC3

1

~70kΩ

HLDR

2002 Microchip Technology Inc.

DS21457B-page 11

TC7116/A/TC7117/A

4.6

Reference Voltage

4.0

COMPONENT VALUE

SELECTION

To generate full scale output (2000 counts), the analog

input requirement is V = 2V . Thus, for the 200mV

and 2V scale, V

IN

REF

4.1

Auto-Zero Capacitor

should equal 100mV and 1V,

REF

respectively. In many applications, where the ADC is

connected to a transducer, a scale factor exists

between the input voltage and the digital reading. For

instance, in a measuring system, the designer might like

to have a full scale reading when the voltage from the

transducer is 700mV. Instead of dividing the input down

to 200mV, the designer should use the input voltage

The size of the auto-zero capacitor has some influence

on system noise. For 200mV full scale, where noise is

very important, a 0.47µF capacitor is recommended.

On the 2V scale, a 0.047µF capacitor increases the

speed of recovery from overload and is adequate for

noise on this scale.

directly and select V

= 350mV. Suitable values for

REF

4.2

Reference Capacitor

integrating resistor and capacitor would be 120kW and

0.22µF. This makes the system slightly quieter and also

avoids a divider network on the input. The TC7117/

TC7117A, with ±5V supplies, can accept input signals

up to ±4V. Another advantage of this system is when a

A 0.1µF capacitor is acceptable in most applications.

However, where a large Common mode voltage exists

(i.e., the V - pin is not at analog common), and a

200mV scale is used, a larger value is required to pre-

vent rollover error. Generally, 1µF will hold the rollover

error to 0.5 count in this instance.

IN

digital reading of zero is desired for V ≠ 0. Tempera-

IN

ture and weighing systems with a variable tare are

examples. This offset reading can be conveniently gen-

erated by connecting the voltage transducer between

4.3

Integrating Capacitor

V

+ and analog common, and the variable (or fixed)

IN

The integrating capacitor should be selected to give the

maximum voltage swing that ensures tolerance buildup

will not saturate the integrator swing (approximately

0.3V from either supply). In the TC7116/TC7116A or

the TC7117/TC7117A, when the analog common is

used as a reference, a nominal ±2V full scale integrator

swing is acceptable. For the TC7117/TC7117A, with

±5V supplies and analog common tied to supply

ground, a ±3.5V to ±4V swing is nominal. For 3 read-

offset voltage between analog common and V -.

IN

5.0

TC7117/TC7117A POWER

SUPPLIES

The TC7117/TC7117A are designed to operate from

±5V supplies. However, if a negative supply is not avail-

able, it can be generated with a TC7660 DC-to-DC con-

verter and two capacitors. Figure 5-1 shows this

application.

ings per second (48kHz clock), nominal values for C

INT

are 0.22µ1F and 0.10µF, respectively. If different oscil-

lator frequencies are used, these values should be

changed in inverse proportion to maintain the output

swing. The integrating capacitor must have low dielec-

tric absorption to prevent rollover errors. Polypropylene

capacitors are recommended for this application.

In selected applications, a negative supply is not

required. The conditions for using a single +5V supply

are:

1. The input signal can be referenced to the center

of the Common mode range of the converter.

2. The signal is less than ±1.5V.

3. An external reference is used.

4.4

Integrating Resistor

Both the buffer amplifier and the integrator have a class

A output stage with 100µA of quiescent current. They

can supply 20µA of drive current with negligible non-

linearity. The integrating resistor should be large

enough to remain in this very linear region over the

input voltage range, but small enough that undue leak-

age requirements are not placed on the PC board. For

2V full scale, 470kΩ is near optimum and, similarly,

47kΩ for 200mV full scale.

FIGURE 5-1:

NEGATIVE POWER

SUPPLY GENERATION

WITH TC7660

+5V

35

V+

36

V

+

REF

LED

Drive

32

31

COM

4.5

Oscillator Components

TC7117

TC7117A

+

V

+

For all frequency ranges, a 100kΩ resistor is recom-

mended; the capacitor is selected from the equation:

IN

V

IN

30

21

V

-

IN

8

–

2

EQUATION 4-1:

GND

+

10µF

4

V-

26

TC7660

0.45

5

(-5V)

f = -----------

RC

3

+

10µF

For a 48kHz clock (3 readings per second), C = 100pF.

DS21457B-page 12

2002 Microchip Technology Inc.

TC7116/A/TC7117/A

In addition to limiting maximum power dissipation, the

resistor reduces change in power dissipation as the

display changes. The 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-

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

the resistor circuit 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%.

6.0

TYPICAL APPLICATIONS

The TC7117/TC7117A sink the LED display current,

causing 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 TC7117/

TC7117A package power dissipation is reduced.

Figure 6-1 is a curve tracer display showing the rela-

tionship between output current and output voltage for

typical TC7117CPL/TC7117ACPL devices. Since a

typical LED has 1.8V across it at 8mA and its common

anode is connected to +5V, the TC7117/TC7117A out-

put is at 3.2V (Point A, Figure 6-1). Maximum power

dissipation is 8.1mA x 3.2V x 24 segments = 622mW.

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.

However, notice that once the TC7117/TC7117A's out-

put voltage is above 2V, the LED current is essentially

constant as output voltage increases. Reducing the

output voltage by 0.7V (Point B Figure 6-1) results in

7.7mA of LED current, only a 5% reduction. Maximum

power dissipation is now only 7.7mA x 2.5V x 24 =

462mW, a reduction of 26%. An output voltage reduc-

tion of 1V (Point C) reduces LED current by 10%

(7.3mA), but power dissipation by 38% (7.3mA x 2.2V

x 24 = 385mW).

FIGURE 6-2:

DIODE OR RESISTOR

LIMITS PACKAGE POWER

DISSIPATION

In

-5V

+5V

+

–

1MΩ

TP3

24kΩ

150kΩ

1kΩ

0.47

µF

0.22

µF

100

pF

0.01

µF

TP5

TP2

TP1

0.1

µF

Display

FIGURE 6-1:

TC7117/TC7117A OUTPUT

VS. OUTPUT VOLTAGE

100

47

kΩ

40

1

35

30

TP

21

10.000

9.000

8.000

4

TC7117

TC7117A

10

20

A

Display

B

1.5W, 1/4Ω

C

1N4001

7.000

6.000

2.00

2.50

3.00

3.50

4.00

Output Voltage (V)

Reduced power dissipation is very easy to obtain.

Figure 6-2 shows two ways: either a 5.1Ω, 1/4W resis-

tor, or a 1A diode placed in series with the display (but

not in series with the TC7117/TC7117A). The resistor

reduces the TC7117/TC7117A's output voltage (when

all 24 segments are ON) to Point C of Figure 6-1. When

segments turn off, the output voltage will increase. The

diode, however, will result in a relatively steady output

voltage, around Point B.

2002 Microchip Technology Inc.

DS21457B-page 13

TC7116/A/TC7117/A

FIGURE 6-3:

TC7116/TC7117A USING THE INTERNAL REFERENCE

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

Set V

REF

= 100mV

40

39

38

37

36

35

34

33

32

31

30

29

28

27

26

25

24

23

22

21

100kΩ

100pF

22kΩ

1MΩ

0.1pF

1kΩ

+

In

0.01µF

47kΩ

TC7116

TC7116A

+

0.47µF

–

9V

–

0.22µF

To Display

To Backplane

FIGURE 6-4:

TC7117/TC7117A INTERNAL REFERENCE

(200mV FULL SCALE, 3 RPS, V - TIED TO GND FOR SINGLE ENDED INPUTS)

IN

Set V

= 100mV

REF

40

39

38

37

36

35

34

33

32

31

30

29

28

27

26

25

24

23

22

21

100kΩ

100pF

22kΩ

1MΩ

+5V

1kΩ

0.1pF

+

In

0.01µF

47kΩ

TC7117

TC7117A

0.47µF

–

0.22µF

-5V

To Display

DS21457B-page 14

2002 Microchip Technology Inc.

TC7116/A/TC7117/A

FIGURE 6-5:

CIRCUIT FOR DEVELOPING UNDER RANGE AND OVER RANGE SIGNALS

FROM TC7116/TC7117A OUTPUTS

V+

40

To Logic V

CC

35

To Logic

GND

TC7116

TC7116A

26

V-

O/R

U/R

20

21

CD4023

or 74C10

CD4077 O/R = Over Range

U/R = Under Range

FIGURE 6-6:

TC7117/TC7117A WITH A 1.2 EXTERNAL BANDGAP REFERENCE

(V - TIED TO COMMON)

IN

40

39

38

37

36

35

34

33

32

31

30

29

28

27

26

25

24

23

22

21

100kΩ

Set V

= 100mV

REF

100pF

10kΩ

V+

1kΩ

0.1pF

+

1.2V

In

0.01µF

47kΩ

1MΩ

TC7117

TC7117A

0.47µF

0.22µF

–

To Display

2002 Microchip Technology Inc.

DS21457B-page 15

TC7116/A/TC7117/A

FIGURE 6-7:

RECOMMENDED COMPONENT VALUES FOR 2V FULL SCALE

(TC7116/TC7116A AND TC7117/TC7117A)

Set V

= 1V

REF

40

39

38

37

36

35

34

33

32

31

30

29

28

27

26

25

24

23

22

21

100kΩ

100pF

24kΩ

1MΩ

V+

0.1µF

25kΩ

+

TC7116

TC7116A

TC7117

In

0.01µF

470kΩ

0.047µF

–

TC7117A

0.22µF

V-

To Display

FIGURE 6-8:

TC7117/TC7117A OPERATED FROM SINGLE +5V SUPPLY

(AN EXTERNAL REFERENCE MUST BE USED IN THIS APPLICATION)

40

100kΩ

Set V

= 100mV

39

38

37

36

35

34

33

32

31

30

29

28

27

26

25

24

23

22

21

REF

100pF

10kΩ

V+

1kΩ

0.1pF

+

1.2V

In

0.01µF

47kΩ

1MΩ

TC7117

TC7117A

0.47µF

0.22µF

–

To Display

DS21457B-page 16

2002 Microchip Technology Inc.

TC7116/A/TC7117/A

7.0

7.1

PACKAGING INFORMATION

Package Marking Information

Package marking data not available at this time.

7.2

Taping Form

Component Taping Orientation for 44-Pin PLCC 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 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 Technology Inc.

DS21457B-page 17

TC7116/A/TC7117/A

7.3

Package Dimensions

40-Pin PDIP (Wide)

PIN 1

.555 (14.10)

.530 (13.46)

2.065 (52.45)

2.027 (51.49)

.610 (15.49)

.590 (14.99)

.200 (5.08)

.140 (3.56)

.040 (1.02)

.020 (0.51)

.015 (0.38)

.008 (0.20)

.150 (3.81)

.115 (2.92)

3° MIN.

.700 (17.78)

.610 (15.50)

.110 (2.79)

.090 (2.29)

.070 (1.78)

.045 (1.14)

.022 (0.56)

.015 (0.38)

Dimensions: inches (mm)

40-Pin CERDIP (Wide)

PIN 1

.540 (13.72)

.510 (12.95)

.098 (2.49) MAX.

.030 (0.76) MIN.

2.070 (52.58)

2.030 (51.56)

.620 (15.75)

.590 (15.00)

.060 (1.52)

.020 (0.51)

.210 (5.33)

.170 (4.32)

.015 (0.38)

.008 (0.20)

3° MIN.

.150 (3.81)

MIN.

.200 (5.08)

.125 (3.18)

.700 (17.78)

.620 (15.75)

.020 (0.51)

.016 (0.41)

.110 (2.79)

.090 (2.29)

.065 (1.65)

.045 (1.14)

Dimensions: inches (mm)

DS21457B-page 18

2002 Microchip Technology Inc.

TC7116/A/TC7117/A

7.3

Package Dimensions (Continued)

44-Pin PLCC

PIN 1

.021 (0.53)

.013 (0.33)

.050 (1.27) TYP.

.695 (17.65)

.685 (17.40)

.630 (16.00)

.591 (15.00)

.656 (16.66)

.650 (16.51)

.032 (0.81)

.026 (0.66)

.020 (0.51) MIN.

.656 (16.66)

.650 (16.51)

.120 (3.05)

.090 (2.29)

.695 (17.65)

.685 (17.40)

.180 (4.57)

.165 (4.19)

Dimenisons: inches (mm)

44-Pin PQFP

7° MAX.

.009 (0.23)

.005 (0.13)

PIN 1

.041 (1.03)

.026 (0.65)

.018 (0.45)

.012 (0.30)

.398 (10.10)

.390 (9.90)

.557 (14.15)

.537 (13.65)

.031 (0.80) TYP.

.010 (0.25) TYP.

.398 (10.10)

.390 (9.90)

.083 (2.10)

.075 (1.90)

.557 (14.15)

.537 (13.65)

.096 (2.45) MAX.

Dimenisons: inches (mm)

2002 Microchip Technology Inc.

DS21457B-page 19

TC7116/A/TC7117/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

6 = LCD

7 = LED

TC711X X X XXX

}

A or blank*

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

* "A" parts have an improved reference TC

Package Code (see Device Selection Table)

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

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

DS21457B-page 20

2002 Microchip Technology Inc.

TC7116/ATC7117/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-

nology Incorporated 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.

2002 Microchip Technology Inc.

DS21457B-page 21

WORLDWIDE SALES AND SERVICE

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Rm. 2401, 24th Floor,

Ming Xing Financial Tower

No. 88 TIDU Street

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

Chicago

333 Pierce Road, Suite 180

Itasca, IL 60143

Chengdu 610016, China

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

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

China - Fuzhou

Dallas

Microchip Technology Consulting (Shanghai)

Co., Ltd., Fuzhou Liaison Office

Unit 28F, World Trade Plaza

No. 71 Wusi Road

Fuzhou 350001, China

4570 Westgrove Drive, Suite 160

Addison, TX 75001

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

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

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

Kokomo

France

2767 S. Albright Road

Kokomo, Indiana 46902

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

Los Angeles

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

18201 Von Karman, Suite 1090

Irvine, CA 92612

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

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

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

Hong Kong

Italy

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

Microchip Technology SRL

Centro Direzionale Colleoni

Palazzo Taurus 1 V. Le Colleoni 1

20041 Agrate Brianza

Milan, Italy

6285 Northam Drive, Suite 108

Mississauga, Ontario L4V 1X5, Canada

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

India

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

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

03/01/02

DS21457B-page 22

2002 Microchip Technology Inc.


型号：	TC7116CLW
厂家：	MICROCHIP
描述：	3-1/2 Digit Analog-to-Digital Converters with Hold 3-1 / 2位模数转换与保持转换器转换器
文件：	总22页 (文件大小：549K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

TC7116CLW [MICROCHIP]

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