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參數(shù)資料
| 型號： | TC8129CKW |
| 元件分類： | ADC |
| 英文描述： | 1-CH PROPRIETARY METHOD ADC, PQFP44 |
| 封裝： | PLASTIC, QFP-44 |
| 文件頁數(shù)： | 13/17頁 |
| 文件大?。?/td> | 137K |
| 代理商： | TC8129CKW |
5
TC8129
TC8129 - 3/29/96-2
2001 Microchip Technology Inc.
DS21473A
4C\VDigit Auto-Ranging DMM ADC
GENERAL THEORY OF OPERATION
The TC8129 is a high-resolution analog to digital con-
verter (ADC) with an input multiplexer for autoranging mea-
surements and a serial digital output. When combined with
the TC8131 controller, the TC8129 forms a 4
digit
autoranging DMM which measures voltage, current, resis-
tance, capacitance, frequency, temperature and transistor
hFE.
The TC8129 operates with the TC8131 controller or
with a microcomputer. The TC8129 provides all analog
measurement functions, while the TC8131 controls the
LCD display and user interface, and sends measurement
mode and range commands to the TC8129.
On-chip multiplexer provides five measurement ranges
for voltage and capacitance, and six ranges for resistance.
The TC8129’s 50msec conversion time supports a fast
bar graph display as well as the high-resolution numeric
display.
A/D CONVERTER
Multiple remainder conversion
The TC8129 uses a multiple-deintegration method of
A/D conversion to provide over 500,000 counts of resolu-
tion in 50 milliseconds. Five separate deintegrate opera-
tions are performed on each conversion. After each
deintegrate period, a residual voltage remains on the inte-
gration capacitor (CINT). This residual voltage is multiplied
by 10 and deintegrated again. After five deintegrations, the
voltage at the input of the A/D converter has been con-
verted into a 5
digit number. The least significant digit is
normally discarded, leaving a 4
digit result.
The sign bit and value of each deintegration period are
stored in the TC8129 output register, and transferred to the
TC8131 at the end of each conversion.
The TC8131 converts the five deintegration values into
a final A/D conversion result (see the Data Output Format
section of this data sheet for details).
Zero Reading
The TC8129 does not do an autozero phase during
each conversion. Instead, the controller may send a Offset
Reading command which instructs the TC8129 to inter-
nally short the A/D converter inputs and make a conver-
sion. This conversion represents the internal offsets of the
TC8129 buffer, integrator and comparator. The Offset Read-
ing value is subtracted from normal conversions to calcu-
late the actual A/D conversion result.
50/60 Hz Rejection Control
Integrating A/D converters provide excellent rejection
of periodic interference such as 60Hz line frequency, pro-
vided the integration period is a multiple of the interfering
signal. The TC8129 can adjust its integration time to reject
either 50Hz or 60Hz interference. The integration time is
set with the command word which is sent to the TC8129
(see the serial data interface section of this data sheet).
With a 32.768kHz clock, the integration times are:
Mode
Clock Cycles
Integration time
60Hz
545
16.63 msec
50Hz
655
19.99 msec
Autoranging Voltage Measurements
When combined with external attenuation resistors,
(see the Typical Application diagram), the TC8129 will
measure voltages from 400mV to 4000V. The TC8131
sends a range command to the TC8129 via the serial data
bus, and the TC8129 connects internal switches to the
appropriate tap on the resistor network.
AC Measurements
The integrating A/D converter of the TC8129 will not
directly measure AC signals. When an AC measurement
is desired, internal switches on the TC8129 connect the
input to an internal op-amp. This op-amp, when combined
with inexpensive discrete components, can be configured
as an AC-to-DC converter. If true RMS measurements are
desired, an external AC-to-DC converter can be added.
See the applications section of this data sheet for details.
PIN DESCRIPTION (cont.)
Pin No.
(44-Pin flat
Package)
Symbol
Description
40
SCLK
Serial data clock input
41
LD
Data Load input. When low, range and measurement mode commands can be loaded into the
TC8129
42
SLEEP
Power shut down input, places TC8129 in low power mode.
43
OSC1
Crystal oscillator (input) connection
44
OSC2
Crystal oscillator (output) connection
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