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Min. Differential
Voltage
(V)
0
0
0
0
0
0
0
0
The A/D converter inputs can also be used with 4–20 mA current sources by measuring the
resulting analog voltage drop across 249 1% precision resistors placed between the ana-
log input and analog ground for ADC_IN3 to ADC_IN6. Be sure to reconfigure the
jumper positions on header JP8 as shown in Section B.1.8 using the slip-on jumpers
included with the spare parts in the Development Kit.
B.1.5.2 Thermistor Input
Analog input THERM_IN7 on the Prototyping Board was designed specifically for use
with a thermistor in conjunction with the
strates how to use analog input THERM_IN7 to calculate temperature for display to the
Dynamic C
STDIO
window. The sample program is targeted specifically for the thermistor
included with the Development Kit with R
to use the applicable R
0
Install the thermistor at location J7, which is shown in Figure B-4.
Thermistor
Figure B-6. RCM3700 Prototyping Board Thermistor Input
RabbitCore RCM3700 User's Manual
Table B-3. Differential Voltage Ranges
Max. Differential
Voltage
(V)
±20.0
±10.0
±5.0
±4.0
±2.5
±2.0
±1.25
±1.0
THERMISTOR.C
@ 25°C = 3 k and 25/85 = 3965. Be sure
0
and values for your thermistor if you use another thermistor.
VREF
1 kW
J7
THERM_IN7
ANALOG_GND
Amplifier
mV per Count
Gain
x1
10
x2
5
x4
2.5
x5
2.0
x8
1.25
x10
1.00
x16
0.625
x20
0.500
sample program, which demon-
ADC
ADC
100
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