20-101-1221 Rabbit Semiconductor, 20-101-1221 Datasheet - Page 112

• Manufacturer Part Number: 20-101-1221
• Description: RCM4400W (JAPAN TELEC CERTIFIED)
• Manufacturer: Rabbit Semiconductor
• Series: RabbitCore®r

Specifications of 20-101-1221

• Frequency: 2.4GHz
• Modulation Or Protocol: 802.11 b
• Power - Output: 16dBm
• Voltage - Supply: 3.3V
• Current - Receiving: 450mA
• Current - Transmitting: 450mA
• Data Interface: Connector, 2 x 25 Header
• Memory Size: 512K Flash, 1MB SRAM
• Antenna Connector: SMA
• Operating Temperature: -20°C ~ 85°C
• Package / Case: Module
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Applications: -
• Sensitivity: -
• Data Rate - Maximum: -
• Other names: 316-1147

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 based on the Rabbit
4000 microprocessor, but is not installed on the RCM4400W. Since the RCM4400W Rabbit-
Core module does not have the ADS7870 A/D converter chip, the Prototyping Board will
not provide A/D converter capability with the RCM4400W RabbitCore module.
B.4.4 Serial Communication
The Prototyping Board allows you to access the serial ports from the RCM4400W 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 4000’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 RCM4400W module’s maximum baud rate for dis-
tances of up to 15 m.
106
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 RCM4400W
RS-232
RS-232
—
—
—
—