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connectBlue
13
-
8
-
GREEN/Switch-1
CMOS
In/Out
3
This signal is multiplexed:
GREEN:Logic Green LED Signal (see the Operating
Status section). Not valid until 500ms after startup.
Active low.
Switch-1: If the level on this pin is pulled-down** the
unit goes back to default serial settings. The Switch-1
input is only active during the first 500ms after startup.
The module will restore all factory settings if both the
Switch-1 and Switch-0 signals are low during start up.
See the Serial Port Adapter AT command
Specification for more information on the Restoring
Default Configuration functionality.
See section GREEN/Switch-1 for design examples.
14
-
9
-
BLUE
CMOS
Out
4
Logic Blue LED Signal (see the Operating Status
section). Active low.
Note:Signal will flicker at data transmission.
See section BLUE Signal for design examples.
15
16
17
18
19
20
-
-
-
-
-
-
10
11
12
13
5
18,
5
3
6
4
-
-
UART-CTS*
UART-TxD*
UART-RTS*
UART-RxD*
UART-DTR*
UART-DSR*
CMOS
CMOS
CMOS
CMOS
CMOS
CMOS
In
Out
Out
In
Out
In
5
6
7
8
0
9
Clear To Send. Hardware flow control. Active low.
Transmit Data. "0" : Low, "1" : High
Request To Send. Hardware flow control. Active low.
Receive Data. "0" : Low, "1" : High
Data Terminal Ready. Active low.
Data Set Ready. Active low.
30***
-
19
1
-
CMOS
In
Hardware reset
-
9
36
-
SerialSelect-0 /
CMOS
Out /
20
SerialSelect-0: Control signal for external serial
I2C-SDA
Bidirectional
transceivers.
See Appendix Serial Interface section for more info.
I2C-SDA: I2C Serial data. Only used for communicating
with an external Apple? Authentication Coprocessor,
see the Bluetooth Serial Port Adapter Compatibility
iPhone and Android document for more info.
-
10
35
-
SerialSelect-1 /
CMOS
Out
19
SerialSelect-1: Control signal for external serial
I2C-SCL
transceivers.
See Appendix Serial Interface section for more info.
I2C-SCL: I2C clock. Only used for communicating with
an external Apple? Authentication Coprocessor, see
the Bluetooth Serial Port Adapter Compatibility
iPhone and Android document for more info.
-
20
2
-
VCC_2V85
2.85 V
Out
-
Regulated interface voltage for voltage level shifting,
max 10mA.
* All signals are logic level UART signals (typically 0 - 2.85VDC).
** Use max 4.7kOhm as pull-down which is different to previous product generations from connectBlue.
*** Alternative signal pin recommended to use in new designs (both signal pins should be connected).
3.3 Characteristics
The cB-OBS411 module has linear power supplies, which means that the current is constant if the voltage supply is changed.
3.3.1 Power supply
NOTE
Read the Guidelines for Efficient and Safe Use before using the modules.
Copyright ? 2010 connectBlue AB
Page 9 of 42
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