XIB-E【PDF 13/64 页】BOARD INTERFACE ETHERNET

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XStream"燨EM燫F燤odule?燩roduct燤anual爒5.x00燵2006.02.24]?/DIV>

2.2.3. Receive Mode

If the module detects RF data while in Idle Mode, the module transitions into Receive Mode to

receive RF packets. Once a packet is received, the module checks the CRC 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.

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.

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2.2.4. Sleep Mode

Sleep Modes enable the XStream Module to operate at minimal power consumption when not in

use. Three Sleep Mode options are available:

Note: If serial data exists in the DI buffer while the module is in

Receive Mode, the UART data will be transmitted after the module is

finished receiving the RF data and has returned to Idle Mode.

" Pin Sleep (Host Controlled)

" Serial Port Sleep (Wake on Serial Port activity)

" Cyclic Sleep (Wake on RF activity)

For the module to transition into Sleep Mode, the module must have a non-zero SM (Sleep Mode)

Parameter and one of the following must occur:

1. The module is idle (no data transmission or reception) for a user-defined period of time [See

ST (Time before Sleep) Command]

2. DI3 (pin 2) is asserted (only for Pin Sleep option)

In Sleep Mode, the module will not transmit or receive data until the module first transitions to

Idle Mode. All Sleep Modes are enabled and disabled using SM Command. Transitions into and

out of Sleep Modes are triggered by various mechanisms as shown in the table below.

Table?01. Summary爋f燬leep燤ode燙onfigurations?/DIV>

Sleep Mode

Setting

Transition into

Sleep Mode

Transition out of

Sleep Mode

Commands

Typical Power

Consumption

Pin Sleep

(SM = 1)

Microcontroller can shut down and wake

modules by asserting (high) SLEEP (pin 2).

Note: Module will complete transmission /

reception before activating Pin Sleep.

De-assert (low)

SLEEP (pin 2).

26 礎

Serial Port Sleep

(SM = 2)

Automatic transition to Sleep Mode occurs

after a user-defined period of inactivity (no

transmitting or receiving of data). The

period of activity is defined using the ST

(Time before Sleep) Command.

When serial byte is

received on the DI pin

(pin 4).

SM, ST

1 mA

Cyclic Sleep

(SM = 3-8)

Automatic transition to Sleep Mode occurs

in cycles as defined by the SM (Sleep

Mode) Command.

Note: The cyclic sleep time interval must be

shorter than the Wake-up Initializer Timer

(set by LH Command).

After the cyclic sleep

time interval elapses.

Note: Module can be

forced into Idle Mode

if PW (Pin Wake-up)

Command is issued.

SM, ST, HT,

LH, PW

76 礎

when sleeping

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