101-0570 Rabbit Semiconductor, 101-0570 Datasheet - Page 79

• Manufacturer Part Number: 101-0570
• Description: COMPUTER SNGLBD BL2120 FRCTNLOCK
• Manufacturer: Rabbit Semiconductor

Specifications of 101-0570

• Module/board Type: Single Board Computer Module
• Product: Modules
• Data Bus Width: 12 bit
• Processor Type: Rabbit 2000
• Sram: 128 KB
• Flash: 256 KB
• Timers: 8 bit
• Number Of I/os: 40
• Backup Battery: 3 V Lithium Coin Type
• Operating Voltage: 36 V
• Power Consumption: 1.5 W
• Board Size: 105 mm x 87 mm x 24 mm
• Description/function: Computer Module
• Ram: 512 KB
• For Use With/related Products: BL2120
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

B.1 Power Supplies
Power is supplied to the BL2100 via header J5/J4. The BL2100 is protected against
reverse polarity by a diode at D1 as shown in Figure B-1.
The input voltage range is from 9 V to 36 V. A switching power regulator is used to pro-
vide a Vcc of +5 V for the BL2100 logic circuits. Vcc is not accessible to the user.
The digital ground and the analog ground share a single split ground plane on the board,
with the analog ground connected at a single point to the digital ground by a 0  resistor
(R29). This is done to minimize digital noise in the analog circuits and to eliminate the
possibility of ground loops. External connections to analog ground are made on header
J2/J1, and external connections to digital ground are made on headers J5/J4 and J11/J10.
B.1.1 Power for Analog Circuits
Power to the analog circuits is provided by way of a two-stage low-pass filter, which iso-
lates the analog section from digital noise generated by the other components. The analog
power voltage +V powers the op-amp for the buffered A/D converter inputs, the A/D con-
verter, the D/A converter, and the 4.096 V reference circuit. The maximum current draw
on +V is less than 10 mA. +V is not accessible to the user.
User’s Manual
Appendix B describes the power circuitry provided on the
BL2100.
A
Figure B-1. BL2100 Power Supply
PPENDIX
B. P
OWER
S
UPPLY
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