User's Manual

Class 1 Bluetooth v2.0 Module
User’s Guide
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www.lairdtech.com/bluetooth
9
CONN-GUIDE-BT730_v0.9
Pin
Signal
Description
Comment
17
UART_DCD
UART_DCD I/P or O/ P
18
GPIO_9
I/O for host
19
GPIO_8
I/O for host
20
GND
21
Analogue 00
1.8 V max
22
UART_RX
Receive data I/P
23
UART_TX
Transmit data O/P
24
UART_RTS
Request to Send O/P
25
UART_CTS
Clear to Send I/P
26
USB_D+
Not used for AT module variants
27
USB_D-
Not used for AT module variants
28
UART_RI
Ring Input or Output
29
GPIO_3/UART_DTR
I/O for host/UART_DTR
30
GPIO_5
I/O for host
31
GPIO_4
I/O for host
32
SPI_CSB
SPI bus chip select I/P
See Note 2
33
SPI_MISO
SPI bus serial O/P
See Note 2
34
GND
Only on uFL version
See Note 3
35
RF_OUT
Only on uFL version
See Note 3
36
GND
Only on uFL version
See Note 3
Notes:
1. Unused pins may have internal connections and must not be connected.
2. Pins 2, 6, 32, and 33 (SPI related) are only for Laird internal production purposes.
3. Pins 34 - 36 are only for uFL connector version of module – BT730-SC
4. Power-on-reset (power cycling and brown out consideration) – The reset circuitry within the
BT730 module incorporates a brown-out detector; this may simplify power supply design. The
BT730 reset line is an active low. Input debounced so must be low for more than 5 ms to cause a
reset. Upon the application of power, the Power On Reset circuit built into the module ensures
that the unit starts correctly. There is no need for an external power reset monitor.
5. Power Supply Consideration – The power supply for the module should be a single voltage
source of VCC within the VCC_IN range of 3.0 V to 5.0 V. It must be able to provide sufficient
current in a transmit burst. This can rise to 200 mA. To limit dissipation it is recommended that
you use a voltage at the lower end of the range.
6. The module includes regulators to provide local 3.3 V. This rail is accessible on pin 13 for
monitoring purposes only. Under no circumstances should this pin be used to source current.