101-1102 Rabbit Semiconductor, 101-1102 Datasheet - Page 95
![no-image](/images/no-image-200.jpg)
101-1102
Manufacturer Part Number
101-1102
Description
KIT DEV RABBIT RCM4100 INTL
Manufacturer
Rabbit Semiconductor
Series
RabbitCore 4000r
Type
MPU Moduler
Datasheet
1.20-101-1093.pdf
(112 pages)
Specifications of 101-1102
Contents
RabbitCore Module, Dev. Board, Cable and Dynamic C® CD-Rom
For Use With/related Products
RCM4100
Lead Free Status / RoHS Status
Vendor undefined / Vendor undefined
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Many 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 LN0_IN–LN5_IN by moving the 0 Ω
jumper (see Figure B-6) on header JP23 or JP24 associated with the A/D converter input
from analog ground to the reference voltage generated and buffered by the A/D converter.
Adjacent input channels are paired; moving the jumper on JP 23 changes both of the
paired channels (LN4_IN–LN5_IN), and moving the jumper on JP24 changes LN0_IN–
LN1_IN and LN2_IN–LN3_IN. At the present time Rabbit 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.
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, as explained in Section 4.4. Both
differential inputs must be referenced to analog ground, and both inputs must be positive
with respect to analog ground. Table B-4 provides the differential voltage ranges for this
setup.
User’s Manual
Min. Differential
Voltage
NOTE: Analog input LN7_IN does not have the 10 kΩ resistor installed, and so no
(V)
0
0
0
0
0
0
0
0
resistor attenuator is available, limiting its maximum input voltage to 2 V. This input is
intended to be used for a thermistor that you may install at header location JP25.
Max. Differential
Voltage (with
prescaler)
Table B-4. Differential Voltage Ranges
±22.528
±11.264
±5.632
±4.506
±2.816
±2.253
±1.408
±1.126
(V)
Multiplier
Gain
×10
×16
×20
×1
×2
×4
×5
×8
A/D Converter
Actual Gain
14.4
1.8
3.6
4.5
7.2
9.0
18
1
Resolution
(mV)
1.375
1.100
0.688
0.550
2.75
2.20
5.5
11
91
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