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9XTend? ? OEM ? RF ? Module ?‐? Product ? Manual ? v2.x4x ? [2007.01.04]
Chapter ? 2 ?‐? RF ? Module ? Operation
2.2.3. Receive Mode
If a module detects RF data while operating in Idle Mode, the module transitions to Receive Mode
to start receiving RF packets. Once a packet is received, the module checks the CRC (cyclic redun-
dancy check) to ensure that the data was transmitted without error. If the CRC data bits on the
incoming packet are invalid, the packet is discarded. If the CRC is valid, the packet proceeds to the
DO Buffer.
Figure ? 2 ‐ 07. Receive ? Mode ? Data ? Flow
* ? Refer ? to ? the ? ‘Address ? Recognition’ ? sec ‐
tion ? for ? more ? information ? regarding ?
address ? recognition.
The module returns to Idle Mode
when valid RF data is no longer
detected or after an error is
detected in the received RF data. If
serial data is stored in the DI
buffer while the module is in
Receive Mode, the serial data will
be transmitted after the module is
finished receiving data and returns
to Idle Mode.
2.2.4. Shutdown Mode
Hardware Sleep
For applications where power consumption must be kept to a minimum during idle periods, Shut-
down Mode offers the lowest power mode available to the module.
When the SHDN pin (pin 7) is driven low, the module is forced into shutdown mode. Any commu-
nication in progress (transmit or receive) will be halted and any buffered data will be lost. For any
other mode of operation, SHDN must be driven or pulled high. While in shutdown mode, the mod-
ule's VCC pin draws 5 μA (typical).
Immediately after the SHDN pin changes state from low to high, the module resets. After reset,
there is a delay that must be observed. Delay time is <100ms.
While SHDN pin is driven low, the following pins are set to high impedance by the module: DCD,
TX_PWR, RX LED, DO and CTS (See pin signal descriptions, p6). The SHDN line (also used for
RSSI indication) is driven low during shutdown.
The following input pins may continue to be driven by external circuitry when in shutdown mode:
PIN_PWR_DWN, RTS, DI and SHDN.
Note: Because the DO pin also goes high impedance, if the XTend RF Module is connected to a pro-
cessor, the UART receive pin could be floating. A weak pull-up should be placed between the module
and the microcontroller so that data is not interpreted as being transmitted to the microprocessor.
? ? 2007 ? MaxStream, ? Inc.
????? 14
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