20-101-1221 Rabbit Semiconductor, 20-101-1221 Datasheet - Page 49
![RCM4400W (JAPAN TELEC CERTIFIED)](/photos/14/19/141972/20-101-1221_sml.jpg)
20-101-1221
Manufacturer Part Number
20-101-1221
Description
RCM4400W (JAPAN TELEC CERTIFIED)
Manufacturer
Rabbit Semiconductor
Series
RabbitCore®r
Datasheet
1.20-101-1202.pdf
(126 pages)
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
- Current page: 49 of 126
- Download datasheet (2Mb)
4.4 Other Hardware
4.4.1 Clock Doubler
The RCM4400W takes advantage of the Rabbit 4000 microprocessor’s internal clock
doubler. A built-in clock doubler allows half-frequency crystals to be used to reduce
radiated emissions. The 58.98 MHz frequency specified for the RCM4400W is generated
using a 29.49 MHz crystal.
The clock doubler should not be disabled since Wi-Fi operations depend highly on CPU
resources.
4.4.2 Spectrum Spreader
The Rabbit 4000 features a spectrum spreader, which helps to mitigate EMI problems. The
spectrum spreader is on by default, but it may also be turned off or set to a stronger setting.
The spectrum spreader settings may be changed through a simple configuration macro as
shown below.
OEM User’s Manual
1. Select the “Defines” tab from the Dynamic C
2. Normal spreading is the default, and usually no entry is needed. If you need to specify
3. Click
normal spreading, add the line
For strong spreading, add the line
To disable the spectrum spreader, add the line
are in the project file where you defined the macro.
ENABLE_SPREADER=1
ENABLE_SPREADER=2
ENABLE_SPREADER=0
NOTE: Refer to the Rabbit 4000 Microprocessor User’s Manual for more information
NOTE: The strong spectrum-spreading setting is not recommended since it may limit
OK
on the spectrum-spreading setting and the maximum clock speed.
the maximum clock speed or the maximum baud rate. It is unlikely that the strong
setting will be needed in a real application.
to save the macro. The spectrum spreader will now remain off whenever you
Options > Project Options
menu.
43
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