參數(shù)資料
型號(hào)： 20-101-0672
廠商： Rabbit Semiconductor
文件頁數(shù)： 118/136頁
文件大?。?/td> 0K
描述： MODULE RABBITCORE RCM3600
標(biāo)準(zhǔn)包裝： 1
系列： RabbitCore®
模塊/板類型： MPU 核心模塊
適用于相關(guān)產(chǎn)品： RCM3600
產(chǎn)品目錄頁面： 620 (CN2011-ZH PDF)
其它名稱： 316-1102
76
RabbitCore RCM3600
Other possible ranges are possible by physically changing the resistor values that make up
the attenuator circuit.
It is also possible to read a negative voltage on ADC_IN0 to ADC_IN5 by moving the
jumper (see Figure B-5) on header JP7, JP6, or JP5 associated with the A/D converter
input from analog ground to VREF, the reference voltage generated and buffered by the
A/D converter. Adjacent input channels are paired so that moving a particular jumper
changes both of the paired channels. At the present time Rabbit Semiconductor does not
offer the software drivers to work with single-ended negative voltages, but the differential
mode described below may be used to measure negative voltages.
NOTE: THERM_IN7 was configured to illustrate the use of a thermistor with the sample
program, and so is not available for use as a differential input. There is also no resistor
attenuator for THERM_IN7, so its input voltage range is limited.
Differential measurements require two channels. As the name differential implies, the dif-
ference in voltage between the two adjacent channels is measured rather than the differ-
ence between the input and analog ground. Voltage measurements taken in differential
mode have a resolution of 12 bits, with the 12th bit indicating whether the difference is
positive or negative.
The A/D converter chip can only accept positive voltages. Both differential inputs must be
referenced to analog ground, and both inputs must be positive with respect to analog
ground. Table B-3 provides the differential voltage ranges for this setup.
Table B-2. Positive A/D Converter Input Voltage Ranges
Min. Voltage
(V)
Max. Voltage
(V)
Amplifier
Gain
mV per Count
0.0
+20.0
1
10
0.0
+10.0
2
5
0.0
+5.0
4
2.5
0.0
+4.0
5
2.0
0.0
+2.5
8
1.25
0.0
+2.0
10
1.0
0.0
+1.25
16
0.625
0.0
+1.0
20
0.500
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