Philips Semiconductors
UM_1SPP
BGB203 BT 2.0 Serial Port Profile Module User’s Guide
Table 3: DTE Signals
Signal
CD
RI
DTR
DSR
RTS
CTS
Direction
Input
Input
Output
Input
Output
Input
Description
Carrier Detect
Ring Indicator signal
Data Terminal Ready signal
Data Set Ready signal
Ready to Send signal
Clear to Send signal
The 1SPP firmware provides the ability to control Bluetooth low power settings (while in
data mode). These settings, if enabled, utilize the Bluetooth sniff mode, and can
drastically reduce the power consumption used for active Bluetooth connections. The
trade-off for this reduced power is that the latency is increased. This is a facet of the
Bluetooth sniff mode, since the link is only being serviced at regular intervals. Any data
that needs to be sent or received during the sniff interval will have to wait until the interval
expires before it can be set. The 1SPP firmware allows the configuration of this interval
so that the host processor can determine the best latency/power consumption tradeoff
(see the AT+BTPWR command more information).
In addition to Bluetooth low power settings (while in data mode), the 1SPP firmware
allows the ability to reduce power consumption while in command mode. This mode is
known as deep sleep mode and can be entered from command mode by using the
AT+BTSLP command. Deep sleep mode allows the 1SPP firmware to reduce the power
consumption of the chip to micro-Amp (uA) levels when no functionality is required of the
device. The device can be woken from deep sleep mode by utilizing either DTR/DSR or
using the RESET_N line of the BGB203. When the device is woken from deep sleep
mode it retains all prior configuration information (unless the chip is woken by the
RESET_N line in which case the chip is reset completely). This functionality allows the
host to reduce the power consumption of the 1SPP device during periods of inactivity (i.e.
the host does not require any services of the 1SPP device).
When the 1SPP device is operating in command mode (i.e. it is accepting commands)
other Bluetooth functionality is available. This functionality allows the local device the
ability to configure local settings as well as the ability to interactively discover other
Bluetooth devices and the services that those devices support. See the 1SPP command
set documentation for a detailed description of the features that are provided in this
category.
In addition to the above device configuration and Bluetooth functionality, the 1SPP
firmware provides features to aid in device qualification and testing (both Bluetooth and
FCC). The 1SPP command set documentation contains a detailed description of these
commands. The commands that are useful for this purpose are the AT+BTTST ,
AT+BTTX , and AT+BTRXT commands.
? Koninklijke Philips Electronics N.V. 2005
All rights are reserved. Reproduction in whole or in part is prohibited without the prior
written consent of the copyright owner. The information presented in this document does
not form part of any quotation or contract, is believed to be accurate and reliable and may
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consequence of its use. Publication thereof does not convey nor imply any license under
patent- or other industrial or intellectual property rights.
Date of release:21 Dec 2005
Published in The Netherlands
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