User's Manual

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RN41-DS
TABLE 1-6: PIN DESCRIPTION
Pin Name Description Default
1 GND Ground –
2 SPI_MOSI Programming only No connect
3 GPIO6 Set Bluetooth master (high = auto-master
mode)
Input to RN-41 module with weak pulldown
4 GPIO7 Set baud rate (high = force 9,600, low =
115 K or firmware setting)
Input to RN-41 module with weak pulldown
5 RESET Active-low reset Input to RN-41 module with 1K pullup
6 SPI_CLK Programming only No Connect
7 PCM_CLK PCM interface No Connect
8 PCM_SYNC PCM interface No Connect
9 PCM_IN PCM interface No Connect
10 PCM_OUT PCM interface No Connect
11 VDD 3.3-V regulated power input –
12 GND Ground –
13 UART_RX UART receive input Input to RN-41 module
14 UART_TX UART transmit output High level output from RN-41 module
15 UART_RTS UART RTS, goes high to disable host trans-
mitter
Low level output from RN-41 module
16 UART_CTS UART CTS, if set high, it disables transmitter Low level input to RN-41 module
17 USB_D+ USB port 1.5 K pullup activated when USB port is
ready (~500 ms after reset)
18 USB_D- USB port –
19 GPIO2 Status, high when connected, low otherwise Output from RN-41 module
20 GPIO3 Auto discovery = high Input to RN-41 module with weak pulldown
21 GPIO5 Status, toggles based on state, low on con-
nect
Output from RN-41 module
22 GPIO4 Set factory defaults Input to RN-41 with weak pulldown
23 SPI_CSB Programming only No connect
24 SPI_MISO Programming only No connect
25 GND Ground (RN-41N only) –
26 RF ANT Antenna, 50-Ohm impedance (RN-41N only) –
27 GND Ground (RN-41N only) –
28 GND Ground –
29 GND Ground –
30 AIO0 Optional analog input Not used
31 GPIO8 Status (RF data RX/TX) Output from RN-41 module
32 GPIO9 I/O Input to RN-41 module with weak pulldown
33 GPIO10 I/O (remote DTR signal) Input to RN-41 module with weak pulldown
34 GPIO11 I/O (remote RTS signal) Input to RN-41 module with weak pulldown
35 AIO1 Optional analog input Not Used