20-101-1246 Rabbit Semiconductor, 20-101-1246 Datasheet - Page 106

• Manufacturer Part Number: 20-101-1246
• Description: CORE MODULE RCM5400W
• Manufacturer: Rabbit Semiconductor

Specifications of 20-101-1246

• Module/board Type: MPU Core Module
• Wireless Frequency: 73.73 MHz
• For Use With/related Products: RCM5400W
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 316-1148

B.4.3 Analog Features
The Prototyping Board has typical support circuitry installed to complement the ADS7870
A/D converter chip, which is available on other RabbitCore modules, but is not installed on
the RCM5400W. Since the RCM5400W RabbitCore module does not have the ADS7870
A/D converter chip, the Prototyping Board will not provide A/D converter capability with
the RCM5400W RabbitCore module.
B.4.4 Serial Communication
The Prototyping Board allows you to access the serial ports from the RCM5400W module.
Table B-3 summarizes the configuration options.
Serial Ports E and F may be used as serial ports, or the corresponding pins at header loca-
tion J2 may be used as parallel ports.
B.4.4.1 RS-232
RS-232 serial communication on header J4 on both Prototyping Boards is supported by an
RS-232 transceiver installed at U3. This transceiver provides the voltage output, slew rate,
and input voltage immunity required to meet the RS-232 serial communication protocol.
Basically, the chip translates the Rabbit 5000’s signals to RS-232 signal levels. Note that
the polarity is reversed in an RS-232 circuit so that a +3.3 V output becomes approxi-
mately -10 V and 0 V is output as +10 V. The RS-232 transceiver also provides the proper
line loading for reliable communication.
RS-232 can be used effectively at the RCM5400W module’s maximum baud rate for dis-
tances of up to 15 m.
100
Serial Port
A
D
B
C
E
F
Table B-3. Prototyping Board Serial Port Configurations
Header
J2, J4
J2, J4
J2
J2
J2
J2
Programming Port
Default Use
Serial Flash
RS-232
RS-232
—
—
Alternate Use
RabbitCore RCM5400W
RS-232
RS-232
—
—
—
—