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參數(shù)資料
| 型號(hào)： | TC8129CKW |
| 元件分類： | ADC |
| 英文描述： | 1-CH PROPRIETARY METHOD ADC, PQFP44 |
| 封裝： | PLASTIC, QFP-44 |
| 文件頁(yè)數(shù)： | 3/17頁(yè) |
| 文件大小： | 137K |
| 代理商： | TC8129CKW |
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TC8129
TC8129 - 3/29/96-2
2001 Microchip Technology Inc.
DS21473A
4C\VDigit Auto-Ranging DMM ADC
Configuration Word:
Measurement Mode Select (Cont.)
B7
B6
B5
Definition
1
0
1
Diode
1
0
Capacitance-upper range
1
Undefined
AC Line Frequency Select
B8
Definition
0
60Hz
1
50Hz
Integration Time Select
B9
Definition
0
Normal integration (545 CLKS @ 60Hz; 655 CLKS
@ 55Hz; 500 CLKS @ resistance mode
1
Short integration (100 CLKS) for 40M
and diode
modes only
Offset Reading Mode Select
B10
Definition
0
Normal Operation
1
Measurement System Offset
Programmable Buzzer Enable
B11
Definition
0
Disable Buzzer when "CONT" is High
1
Enable Buzzer when "CONT" is High
Note: Bits are sent to the TC8129 from the TC8131 Bit 0 First
Figure 7. Data Format for Setting TC8129 Operating Modes
Formatting the Configuration Word
B0, is the leading bit of the configuration word, selects
whether AC or DC measurements will be made. If B0 is a
logic “1” then the voltage at the input of the TC8129 will be
switched through the AC-to-DC converter.
B1 sets the internal resolution of the TC8129. This bit
should always be set to a logic “0”.
B2-B4 selects the measurement ranges. These bits
control the switches which connect the TC8129 analog
input to the desired tap on the external input attenuator.
The TC8131 or controller adjust the range after each con-
version, to maintain a maximum input voltage of 400 mV
into the TC8129’s A/D converter.
A separate voltage input, mV/RREF (pin 8), can also be
selected with bits B2-B4. Selecting mV/RREF (range code
101) will reduce input leakage errors in the 400 mV voltage
range by bypassing the 10M
attenuation resistor.
B5-B7 selects the measurement mode. The TC8129
configures internal switches to connect the A/D converter
input to the desired measurement function pin (10MEG,
IRC, mV/RREF, etc). The IRC and mV/RREF pins are also
used to add additional functions, such as hFE and tempera-
ture.
B8 adjusts the A/D converter’s integration time to maxi-
mize line frequency rejection. Set this bit to a logic "0" to
select 60Hz rejection or to a logic "1" to select 50Hz
rejection.
B9 modifies the integration time. This bit is normally a
logic "0", but should be set to a logic "1" when the 40M
resistance range is selected.
B10 instructs the A/D to measure its system offset.
Normal measurements are made with B10 LOW. Setting
B10 HIGH will cause the TC8129 to perform a system
offset conversion. The TC8131 stores the system offset
value and subtracts this value from subsequent measure-
ments to obtain the correct A/D conversion result.
AC/DC Mode Select
B0
Definition
0DC
1AC
Digit Select
B1
Definition
0
Normal Operation
Range Select
B4
B3
B2
Definition
0
DIV1
0
1
DIV10
0
1
0
DIV100
0
1
DIV1k
1
0
DIV10k
1
0
1
Millivolts
1
0
Range switches off
1
Range switches off
Measurement Mode Select
B7
B6
B5
Definition
000
V
001
I
010
R
0
1
Capacitance-lower range
1
0
Frequency
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