![background image](http://html2.mh-extra.com/html/rabbit/rabbitcore/rabbitcore_user-manual_3112756103.webp)
User’s Manual
97
R
C
M
3
7
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
Ω
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
THERMISTOR.C
sample program, which demon-
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
0
@ 25°C = 3 k
Ω
and
β
25/85 = 3965. Be sure
to use the applicable R
0
and
β
values for your thermistor if you use another thermistor.
Install the thermistor at location J7, which is shown in Figure B-4.
Figure B-6. RCM3700 Prototyping Board Thermistor Input
Table B-3. Differential Voltage Ranges
Min. Differential
Voltage
(V)
Max. Differential
Voltage
(V)
Amplifier
Gain
mV per Count
0
±20.0
x1
10
0
±10.0
x2
5
0
±5.0
x4
2.5
0
±4.0
x5
2.0
0
±2.5
x8
1.25
0
±2.0
x10
1.00
0
±1.25
x16
0.625
0
±1.0
x20
0.500
ADC
1 k
W
ADC
THERM_IN7
ANALOG_GND
J7
VREF
Thermistor
Summary of Contents for RabbitCore
Page 6: ...RabbitCore RCM3750...
Page 40: ...34 RabbitCore RCM3750...
Page 64: ...58 RabbitCore RCM3750...
Page 126: ...120 RabbitCore RCM3750...
Page 162: ...156 RabbitCore RCM3750...
Page 172: ......