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Philips Semiconductors
UM_1SPP
BGB203 BT 2.0 Serial Port Profile Module User’s Guide
+BTSLP – request device to enter deep sleep mode (very low power)
Description:
This command is used to force the device to enter a very low power
mode (deep sleep). When the device enters deep sleep mode all device
activities are suspended. Activities remain suspended until the device is
instructed to exit low power mode. Currently the only mechanisms that
exist to wake the device involve the assertion of either the DTR or DSR
input (depending upon the device configuration - DCE or DTE) or a
device reset. When the device exits deep sleep mode all previously
configured parameters are maintained (e.g. configuration, UART, etc.).
Low power handling is useful to conserve power consumption during
inactive periods (i.e. no 1SPP device services are required). The current
consumption during deep sleep mode is on the order of micro-Amps (uA)
as opposed to milli-Amps (mA) when in normal operation.
As previously stated, the device can be instructed to exit low power deep
sleep mode by one of two methods:
DSR/DTR Assertion
This exit mode is selected by asserting DTR/DSR (whichever is
configured for input – based upon DCE or DTE device
configuration). These signals are considered asserted when they
are low (active low). It should be noted that these input signals
(either DTR or DSR) are monitored regardless if hardware flow
control has enabled using DTR/DSR (see the AT+BTURT command
for more information). It is also very important to note that if the
correct signal is already asserted when this command is processed,
the BGB203 will wait for the signal to de-assert (high) and then re-
assert (low) before exiting deep sleep mode. This final note signifies
that if the command is issued to the BGB203 and the correct signal
is already asserted, it will not be prevented from going into deep
sleep mode (or immediately exit deep sleep mode). If the correct
signal is de-asserted when the deep sleep mode command is
received then the BGB203 simply exits deep sleep mode when the
correct signal is asserted (there does not have to be a complete
cycle).
Device Reset
This exit mode is selected by either using the RESET_N line (reset
active low) or by physically cycling the power to the BGB203.
This command will output either the success response or an error
response when it has been processed. The 1SPP firmware will not allow
deep sleep mode to be entered if there are any asynchronous Bluetooth
actions outstanding (e.g. Inquiry, SDP search, remote name discovery,
pairing, etc.) or if any test or configuration modes have been entered
(e.g. radio calibration, Bluetooth test mode, transmission test mode,
etc.). In all cases either an OK or ERROR response will be returned
when this command is received by the BGB203. If the command returns
? Koninklijke Philips Electronics N.V. 2005
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Date of release:21 Dec 2005
Published in The Netherlands
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