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参数资料
| 型号： | TC8129CKW |
| 元件分类： | ADC |
| 英文描述： | 1-CH PROPRIETARY METHOD ADC, PQFP44 |
| 封装： | PLASTIC, QFP-44 |
| 文件页数： | 1/17页 |
| 文件大小： | 137K |
| 代理商： | TC8129CKW |
TC8129
TC8129 - 3/29/96-2
2001 Microchip Technology Inc.
DS21473A
FEATURES
s High Resolution ................................................ 10
V
s 4
Digits
s 20 Conversions/Second
s Complete DMM System ADC with TC8131
— Voltage (DC and AC) ............................ 5 Ranges
— Ohms ..................................................... 6 Ranges
— Current (DC and AC)
— Capacitance .......................................... 5 Ranges
— Frequency ............................................. 4 Ranges
s Separate High-Impedance mV Input
s Fast Continuity with Buzzer
s Diode Test
s Internal Op Amp for AC-DC Converter
— True RMS with External Converter
s Serial Data Interface to TC8131 or CMOS Micro-
computer
s Single 9V Battery Operation
s Sleep Mode for Low Power Dissipation
s Provides Power Supply for TC8131 or CMOS
Microcomputer
s Compact 44-Pin Flat Package
4C\VDigit Auto-Ranging DMM ADC
GENERAL DESCRIPTION
The TC8129 is a high resolution, autoranging A/D
converter for 4
digit digital multimeters (DMMs). When
combined with the TC8131 LCD controller, the TC8129 will
measure voltage, current, resistance, capacitance, fre-
quency and temperature. External components are kept to
a minimum for low system cost, without compromising
system performance.
With an internal resolution of over 500,000 counts, the
TC8129 produces stable readings when displaying 4
digits (
±39,999 counts). The 50msec conversion time pro-
vides a fast bar graph which updates 20 times per second.
In addition to the autoranging analog inputs, a separate
direct input to the A/D converter ensures that low-level
readings are both fast and accurate.
For AC voltage and current measurements, an on-chip
op-amp can be configured as an AC-DC converter. An
external AC-DC converter can also be added to provide
true RMS measurements. A three-decade frequency
prescaler allows autoranging frequency measurements from
4kHz to 4MHz, with 1Hz resolution in the 4kHz range.
Data is transferred between the TC8129 A/D converter
and the TC8131 LCD controller via a serial bus that provides
a simple, flexible, bidirectional interface while minimizing
pin count.
The TC8129 operates from a single 9 volt battery, and
provides an on-chip 3 volt power source for the TC8131.
Power supply current for both ICs is only 1.6mA while
operating, and 200
A in the “sleep” mode. The TC8129 is
available in a 44-pin quad plastic flat package.
ORDERING INFORMATION
Part No.
Resolution
Package
Temp. Range
TC8129CKW
4
Digits
44-Pin Plastic
0
°C to + 70°C
Flat Package
FUNCTIONAL BLOCK DIAGRAM
8
9
mV/RREF
IRC
15
CAP+
7
6
5
10meg
1.1meg
101k
10
10k
11
1k
21
V–
IN
43
44
OSC1
0SC2
3
4
1
V+
V–
DGND1
2 DGND2
37
40
41
Data
SCLK
LD
38 RD
35 DV
42 SLEEP
36 FOUT
34 FIN
Frequency
Prescaler
AC/DC
Converter
Function
and
Range
Switches
Analog GND
and
Reference
Oscillator
Power
Serial
Data
A/D Converter
Function
and
Range
Decoder
INPUT/
OUTPUT
Shift
Register
Results
and
Status
Register
18
17
ADI
ADO
20
ACVH
19
ACVL
12
13
16
VLCTRM
COM
14
VHCTRM
VREFR
Fast
Continuity
Comparator
Buzzer
Driver
22
INT
IN
23
INT
OUT
24
C
+ REF
25
C
– REF
28
BUF
30
CONT
31
BUZIN
32
BUZOUT
26
V
+ REF
27
V
– REF
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