IC ADC 4 1/2DGT LCD DVR 40-DIP

TC7129CPL

Manufacturer Part NumberTC7129CPL
DescriptionIC ADC 4 1/2DGT LCD DVR 40-DIP
ManufacturerMicrochip Technology
TC7129CPL datasheets
 


Specifications of TC7129CPL

Display TypeLCDConfiguration7 Segment
Digits Or CharactersA/D 4.5 DigitsCurrent - Supply800µA
Voltage - Supply6 V ~ 12 VOperating Temperature0°C ~ 70°C
Mounting TypeThrough HolePackage / Case40-DIP (0.600", 15.24mm)
Resolution (bits)4.5bitInput Channel TypeDifferential
Data InterfaceParallelSupply Current800µA
Digital Ic Case StyleDIPNo. Of Pins40
Operating Temperature Range0°C To +70°CLead Free Status / RoHS StatusLead free / RoHS Compliant
Interface-Other namesTC7129CPLR
TC7129CPLR
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4-1/2 Digit Analog-to-Digital Converters with
Features:
• Count Resolution: ±19,999
• Resolution on 200 mV Scale: 10 V
• True Differential Input and Reference
• Low Power Consumption: 500 A at 9V
• Direct LCD Driver for 4-1/2 Digits, Decimal Points,
Low Battery Indicator, and Continuity Indicator
• Overrange and Underrange Outputs
• Range Select Input: 10:1
• High Common Mode Rejection Ratio: 110 dB
• External Phase Compensation Not Required
Applications:
• Full-Featured Multimeters
• Digital Measurement Devices
Device Selection Table
Package
Pin
Package
Code
Layout
TC7129CPL
Normal
40-Pin PDIP
TC7129CKW
Formed
44-Pin PQFP
TC7129CLW
44-Pin PLCC
Typical Application
20
19
18
17
16
21
22
23
24
25
+
9V
*N ote : RC network between pins 26 and 28 is not required.
© 2006 Microchip Technology Inc.
On-Chip LCD Drivers
General Description:
The TC7129 is a 4-1/2 digit Analog-to-Digital Converter
(ADC) that directly drives a multiplexed Liquid Crystal
Display (LCD). Fabricated in high-performance, low-
power CMOS, the TC7129 ADC is designed specifi-
cally for high-resolution, battery-powered digital multi-
meter applications. The traditional dual-slope method
of A/D conversion has been enhanced with a succes-
sive integration technique to produce readings accu-
rate to better than 0.005% of full-scale and resolution
down to 10 V per count.
The TC7129 includes features important to multimeter
applications. It detects and indicates low battery condi-
tion. A continuity output drives an annunciator on the
display and can be used with an external driver to sound
an audible alarm. Overrange and underrange outputs,
along with a range-change input, provide the ability to
create auto-ranging instruments. For snapshot read-
ings, the TC7129 includes a latch-and-hold input to
freeze the present reading. This combination of features
Temperature
makes the TC7129 the ideal choice for full-featured
Range
multimeter and digital measurement applications.
0 C to +70 C
0 C to +70 C
0 C to +70 C
Low Battery
Continuity
15
14
13
12
11
10
9
8
7
6
5
TC7129
30
31
32
34
35
36
26
27
28
29
33
*
0.1 µF
0.1
+
µF
20
1 µF
k
150 kΩ
10 k
100 k
+
V
IN
TC7129
V+
5 pF
4
3
2
1
120 kHz
37
38
39
40
330 kΩ
10 pF
0.1 µF
V+
DS21459D-page 1

TC7129CPL Summary of contents

  • Page 1

    ... High Common Mode Rejection Ratio: 110 dB • External Phase Compensation Not Required Applications: • Full-Featured Multimeters • Digital Measurement Devices Device Selection Table Package Pin Package Code Layout TC7129CPL Normal 40-Pin PDIP TC7129CKW Formed 44-Pin PQFP TC7129CLW – 44-Pin PLCC Typical Application 20 ...

  • Page 2

    ... Display Output Lines 44-Pin QFP BATT MINUS TC7129CKW DS21459D-page 2 40-Pin PDIP OSC1 1 40 OSC2 OSC3 CONT 4 37 RANGE DGND REF BATT 7 34 REF TC7129CPL BUFF MINUS REF REF COMMON CONTINUITY INT OUT INT LATCH/HOLD DISP REF REF BATT MINUS 11 BUFF REF ...

  • Page 3

    ... Dissipation ratings assume device is mounted with all leads soldered to printed circuit board. © 2006 Microchip Technology Inc. *Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These ...

  • Page 4

    ... A — 40 — A — 3 — A Test Conditions V+ to pin 28 Common = +0.1V Common = -0. pin 36 V– DGND = +0. V– V– DISP V+ to V– V pin 27 = High OUT V pin 27 = Low OUT Pins 37, 38, 39 Pins 20, 21 sink/source Pin 27 sink/source © 2006 Microchip Technology Inc. ...

  • Page 5

    ... Microchip Technology Inc. Symbol OSC1 Input to first clock inverter. OSC3 Output of second clock inverter. ANNUNCIATOR Backplane square wave output for driving annunciators CONT Output to display segments Output to display segments Output to display segments Output to display segments BATT Output to display segments. ...

  • Page 6

    ... A pull-down for 200 mV scale. Pulled high externally for 2V scale. DP Internal 3 A pull-down. When high, decimal point 2 will be on Internal 3 A pull-down. When high, decimal point 1 will be on. 1 OSC2 Output of first clock inverter. Input of second clock inverter connection. Function © 2006 Microchip Technology Inc. ...

  • Page 7

    ... This equation gives an oscillator frequency of 120 kHz. A similar calculation gives an optimum frequency of 100 kHz for 50 Hz rejection. © 2006 Microchip Technology Inc. The resistor and capacitor values are not critical; those shown work for most applications. In some situations, the capacitor values may have to be adjusted to compensate for parasitic capacitance in the circuit ...

  • Page 8

    ... The value must be high enough to offset the effect of stray capacitance at the capacitor terminals. A value of at least recommended 120 Crystal kHz 330 kΩ REF 0.1 µF across the inputs HI) REF – LO) REF ) REF © 2006 Microchip Technology Inc. ...

  • Page 9

    ... It can be used as a reference for external logic, as explained in Section 4.3 “Connecting to External Logic”, (see Figure 4-1). © 2006 Microchip Technology Inc. + provides an to less than ) forms an 0.1 µ ...

  • Page 10

    ... The diode between DGND and V DISP have a low turn-on voltage because V exceed 0.3V below DGND TC7129 36 DGND 23 V- External Logic Referenced V+ 24 TC7129 – DGND 23 V– External Logic Referenced (pin 19) can be connected DISP should DISP cannot DISP © 2006 Microchip Technology Inc. ...

  • Page 11

    ... For 120 kHz frequency and pF, the calculated value The RC oscillator and the crystal oscillator circuits are shown in Figure 4- 270 120 kHz Figure 4-7: Oscillator Circuits. © 2006 Microchip Technology Inc TC7129 DISP 36 DGND V– 4.6 Measuring Techniques Two important techniques are used in the TC7129: ...

  • Page 12

    ... Note: Shaded area greatly expanded in time and amplitude. Figure 4-10: Integration Waveform. DS21459D-page 12 De-integrate Overshoot due to zero-crossing between clock pulses Integrator Residue Voltage Overshoot caused by comparator delay of 1 clock pulse Clock Pulses DE 1 De-integrate REST X10 DE REST 2 Integrator Residual Voltage X10 DE Zero Integrate 3 © 2006 Microchip Technology Inc. ...

  • Page 13

    ... DE Integrator voltage is ramped to zero. Counter 3 counts up until zero-crossing to correct reading to 5-1/2 digits. Residue is discarded. © 2006 Microchip Technology Inc. TC7129 4.9 Digital Auto-Zeroing To eliminate the effect of amplifier offset errors, the TC7129 uses a digital auto-zeroing technique. After the input voltage is measured as described above, the measurement is repeated with the inputs shorted internally ...

  • Page 14

    ... Sequence Counter/Decoder Control Logic Analog Section BUFF INT INT Integrator – 10 – Buffer + 100 pF ZI, X10 REST 500 k TC7129 To Display Driver Annunciator Drive V DISP UR/DP 3 OR/DP 4 REF HI REF LO INT OUT INT IN X10 Comparator Digital Section – Comparator 2 © 2006 Microchip Technology Inc. ...

  • Page 15

    ... The continuity pin can also be used as an input to drive the continuity annunciator directly from an external source (see Figure 4-13). A schematic of the input/output nature of this pin is also shown in Figure 4-14. © 2006 Microchip Technology Inc. TC7129 IN HI COM IN LO – ...

  • Page 16

    ... The ANNUNCIATOR DRIVE output (pin square wave, running at the backplane frequency (100 Hz or 83.3 Hz) with a peak-to-peak voltage equal to DGND voltage. Connecting an annunciator to pin 3 turns it on; connecting it to its backplane turns it off (pins 16 © 2006 Microchip Technology Inc. ...

  • Page 17

    ... Low Battery MINUS 3 3 Figure 4-16: Display Segment Assignments Figure 4-17: Backplane Waveforms. © 2006 Microchip Technology Inc. Continuity Low Battery Continuity Segment Line All Off a Segment Off Off All On Figure 4-18: Typical Display Output Waveforms. TC7129 1 2 Backplane Connections Continuity ...

  • Page 18

    ... Us er Direction of F eed itch R evers e R eel C omponent Orientation User Direction of Feed Pin 1 P Standard Reel Component Orientation for 713 Suffix Device Carrier Width (W) Pitch (P) Part Per Full Reel Width of C arrier ape W Reel Size 500 13 in © 2006 Microchip Technology Inc. ...

  • Page 19

    ... Mold Draft Angle Bottom * Controlling Parameter § Significant Characteristic Notes: Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed .010” (0.254mm) per side. JEDEC Equivalent: MO-011 Drawing No. C04-016 © 2006 Microchip Technology Inc INCHES* MIN ...

  • Page 20

    ... Microchip Technology Inc. ...

  • Page 21

    ... Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed .010" (0.254mm) per side. BSC: Basic Dimension. Theoretically exact value shown without tolerances. See ASME Y14.5M REF: Reference Dimension, usually without tolerance, for information purposes only. See ASME Y14.5M JEDEC Equivalent: MO-112 AA-1 Drawing No. C04-119 © 2006 Microchip Technology Inc CHAMFER VARIES ...

  • Page 22

    ... TC7129 NOTES: DS21459D-page 22 © 2006 Microchip Technology Inc. ...

  • Page 23

    ... I = -25°C to +85°C Package 40-Pin PDIP KW = 40-Pin PQFP LW = 44-Pin PLCC JL = 40-Pin CDIP Taping Direction: 713 = Standard Taping © 2006 Microchip Technology Inc. TC7129 . Examples: a) TC7129CPL: 40-Pin PDIP b) TC7129CKW713: 44-Pin PQFP Tape and Reel c) TC7129CLW: 44-Pin PLCC DS21459D-page 23 ...

  • Page 24

    ... TC7129 NOTES: DS21459D-page 24 © 2006 Microchip Technology Inc. ...

  • Page 25

    ... To register, access the Microchip web site at www.microchip.com, click on Customer Change Notification and follow the registration instructions. © 2006 Microchip Technology Inc. CUSTOMER SUPPORT Users of Microchip products can receive assistance through several channels: • Distributor or Representative • ...

  • Page 26

    ... What deletions from the document could be made without affecting the overall usefulness there any incorrect or misleading information (what and where)? 7. How would you improve this document? DS21459D-page 26 Total Pages Sent ________ FAX: (______) _________ - _________ N Literature Number: DS21459D © 2006 Microchip Technology Inc. ...

  • Page 27

    ... PowerMate, PowerTool, REAL ICE, rfLAB, rfPICDEM, Select Mode, Smart Serial, SmartTel, Total Endurance, UNI/O, WiperLock and ZENA are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. 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. ...

  • Page 28

    ... Fax: 886-3-572-6459 Taiwan - Kaohsiung Tel: 886-7-536-4818 Fax: 886-7-536-4803 Taiwan - Taipei Tel: 886-2-2500-6610 Fax: 886-2-2508-0102 Thailand - Bangkok Tel: 66-2-694-1351 Fax: 66-2-694-1350 © 2006 Microchip Technology Inc. EUROPE Austria - Wels Tel: 43-7242-2244-399 Fax: 43-7242-2244-393 Denmark - Copenhagen Tel: 45-4450-2828 Fax: 45-4485-2829 France - Paris Tel: 33-1-69-53-63-20 ...