20-101-1221 Rabbit Semiconductor, 20-101-1221 Datasheet - Page 45

• 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

Many countries specify the channel range and power limits for Wi-Fi devices operated
within their borders, and these limits are set automatically in the RCM4400W in firmware
according to the country or region. For example, only channels 1–11 are authorized for use
in the United States or Canada, and so channels 12 and 13 are disabled. See Section 6.2.4.1
for additional information and sample programs demonstrating how to configure an end
device to meet the regulatory channel range and power limit requirements. Table 5 pro-
vides additional information on which channels are allowed in selected countries. Any
attempt to operate a device outside the allowed channel range or power limits will void
your regulatory approval to operate the device in that country.
U21 and U23 are bandpass filters to reduce the transmit and receive sideband noise levels.
The same antenna is used to transmit and receive the 802.11b RF signal. An antenna
switch isolates the high-power RF Tx signal path from the RF Rx signal path. The antenna
switch works by alternately connecting the antennas to either the UW2453 Tx output or to
the UW2453 Rx input. In order to support this antenna-sharing scheme, the RCM4400W
module operates the radio in a half-duplex mode so that receive and transmit operations
never occur at the same time The chip at U22 switches the receive/transmit functionality
between the outputs at J3 and J4 (not stuffed) so that J3 is transmitting while J4 would be
receiving and vice versa. Dynamic C does not support a J4 output.
OEM User’s Manual
* These channels are disabled for units delivered for sale in the United
(not used)
Channel
States and Canada.
12
13
10
14
11
1
2
3
4
5
6
7
8
9
*
*
Table 4. Wi-Fi Channel Allocations
Center Frequency
(GHz)
2.412
2.417
2.422
2.427
2.432
2.437
2.442
2.447
2.452
2.457
2.462
2.467
2.472
2.484
Frequency Spread
2.401–2.423
2.406–2.428
2.411–2.433
2.416–2.438
2.421–2.443
2.426–2.448
2.431–2.453
2.436–2.458
2.441–2.463
2.446–2.468
2.451–2.473
2.456–2.478
2.461–2.483
2.473–2.495
(GHz)
39