XIB-R【PDF 12/36 页】BOARD INTERFACE RS232/485

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9XCite"燨EM燫F燤odule?燩roduct燤anual爒2.1燵2007.01.04]

2007燤axStream,營nc.

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2.2.4. Sleep Modes

Software Sleep

Sleep Modes enable the module to enter states of low-power consumption when not in use. Three

software Sleep Modes are supported:

" Pin Sleep (Host Controlled)

" Serial Port Sleep (Wake on Serial Port activity)

" Cyclic Sleep (Wake on RF activity)

In order to enter Sleep Mode, one of the following conditions must be met (in addition to the mod-

ule having a non-zero SM parameter value):

Once in Sleep Mode, the radio modem does not transmit or receive data until it first returns to Idle

Mode. The return into Idle Mode is triggered by the de-assertion of the Sleep pin or the arrival of a

serial byte through Data In pin.

The following table lists MaxStream's Sleep Mode configurations and the requirements needed to

transition into and out of Sleep Mode:

Table?01. Sleep燤ode燙onfigurations

Pin Sleep (SM = 1)

" Pin/Host-controlled

<Lowest Power Configuration> In order to achieve this low-power state, Pin 2 must be asserted

(high). The modem remains in Pin Sleep until the Sleep pin is de-asserted. The modem will com-

plete a transmission or reception before activating Pin Sleep.

After enabling Pin Sleep (SM (Sleep Mode) Parameter = 1), Pin 2 controls whether the XCite Mod-

ule is active or in Sleep Mode. When Pin 2 is asserted (high), the modem transitions to Sleep Mode

and remains in its lowest power-consuming state until the Sleep pin is de-asserted. The XCite

Module requires 40ms to transition from Sleep Mode to Idle Mode. Pin 2 is only active if the

modem is setup to operate in this mode; otherwise the pin is ignored. Once in Pin Sleep Mode,

CTS

is de-asserted (high), indicating that data should not be sent to the modem. The PWR pin is

also de-asserted (low) when the modem is in Pin Sleep Mode

Note: The module will complete a transmission or reception before activating Pin Sleep.

1. The module is idle (no data transmission or reception) for the amount of time defined by

the ST (Time before Sleep) parameter.

2. SLEEP pin is asserted.

Sleep Mode

Setting

Transition into

Sleep Mode

Transition out of

Sleep Mode

Commands

Power

Consumption

Pin Sleep

(SM=1)

Microcontroller can shut down

and Wake-up modules. Assert

(high) Sleep Pin (Pin 2).

Note: Module will complete a

transmission or reception before

activating Pin Sleep.

De-Assert (low) Sleep

pin (Pin 2)

20 礎

Serial Port Sleep

(SM=2)

Automatic transition into Sleep

Mode after user-defined period

of inactivity (no transmitting or

receiving). Period of inactivity set

using ST Command.

When serial byte is

received on the DI pin

(Pin 4)

SM, ST

1 mA

Cyclic Sleep

(SM=3-8)

Transitions into and out of Sleep Mode in cycles (user-

selectable wake-up interval of time (?second to 16

seconds) set by SM Command). The Cyclic Sleep interval

time must be shorter than Wake-up Initializer Timer (set by

LH Command).

(Can be forced into Idle Mode using Sleep Pin if PW (Pin

Wake-up) Command is issued.)

HT, LH, PW, SM, ST

typically 76 礎

(when sleeping)

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