User's Manual

SPBT3.0DP
Hardware design
January
2016 DocID0xxxxx Rev 0.17
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change
without notice. www.st.com
6.3 GPIO interface
All GPIOs are capable of sinking and sourcing 4 mA of I/O current.
Module GPIO configuration depends on the FW embedded.
GPIO1: Bluetooth Connection Status:
o 0: BT connection not present
o 1: BT connection is present
GPIO4: Module Power Status:
o 1: module is in Active Mode;
o Blinking: module is in Deep Sleep Mode
GPIOs can be reconfigured with the following commands
o At+ab gpioconfig [GPIO pin] [I/O]
o At+ab gpioRead [GPIO pin]
o At+ab gpioWrite [GPIO pin] [1/0]
For more details refer to the User Manual xxxx.
6.4 Reset circuit
Two types of system reset circuits are detailed below. The maximum voltage that can be
supplied to the RESET pin is 3.6V. As shown in Figure 10 and Figure 11 the RESET is
active low, in absence of a reset circuit the pin is internally pulled up and therefore inactive.
6.4.1 External reset circuit
Figure 9: External reset circuit
Note: RPU ranges from 30 kOhm to 50 kOhm internally provided
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