Datasheet

RN42/RN42N
DS50002328A-page 6  2015 Microchip Technology Inc.
TABLE 1-6: PIN DESCRIPTION
Pin type abbreviation: A = Analog, D = Digital, I = Input, O = Output.
Note 1: Pin numbers 7 through 10 are reserved for future use.
Pin Symbol Type Description
1 GND Power Ground reference
2 SPI_MOSI DI (Optional) Factory diagnostic, programming and test. See Section 2.8 “SPI
Interface”.
3 GPIO6 DI Set Bluetooth master.
If GPIO6 = high, module connects to the stored address.
If GPIO3 = high, module enters new Discovery/Pairing mode.
4 GPIO7 DIO Set baud rate (high = force 9,600, low = 115K or firmware setting)
5 RESET
DI Active-low Reset
6 SPI_CLK DI (Optional) Factory diagnostic and test. See Section 2.8 “SPI Interface”.
7 PCM_CLK DIO (Do not connect) PCM interface
(1)
8 PCM_SYNC DIO (Do not connect) PCM interface
(1)
9 PCM_IN DI (Do not connect) PCM interface
(1)
10 PCM_OUT DO (Do not connect) PCM interface
(1)
11 VDD Power Positive Supply
12 GND Power Ground reference
13 UART_RX DI UART receive input
14 UART_TX DO UART transmit output
15 UART_RTS DO UART RTS, goes high to disable host transmitter
16 UART_CTS DI UART CTS, if set high, it disables transmitter
17 USB_D+ DIO USB port. 1.5K pullup activated when USB port is ready (~500 ms after reset).
18 USB_D- DIO USB port
19 GPIO2 DIO Status, high when connected, low otherwise. See Section 2.3 “Connection
Status”.
20 GPIO3 DI Auto-discovery mode = high.
If GPIO6 = high, module performs device enquiry scan searching for a device
with matching class of 0x55AA. If a device is found, the address of the device is
stored in the remote address field and auto-connects.
If GPIO6 = low, module enters Slave mode with special matching class of
0x55AA and waits for a master to discover it.
21 GPIO5 DIO Status, toggles based on state, low on connect. See Section 2.3 “Connection
Status”.
22 GPIO4 DIO Set factory defaults. See Section 2.2 “Factory Reset Using GPIO4”.
23 SPI_CSB DI (Optional) Factory diagnostic and test. See Section 2.8 “SPI Interface”.
24 SPI_MISO DO (Optional) Factory diagnostic and test. See Section 2.8 “SPI Interface”.
25 GND Power Ground reference (RN42N only)
26 RF ANT AIO Antenna, 50-Ohm impedance (RN42N only)
27 GND Power Ground reference (RN42N only)
28 GND Power Ground reference
29 GND Power Ground reference
30 AIO0 AIO (Not used) Optional analog input
31 GPIO8 DO UART TX/RX data activity
32 GPIO9 DIO I/O
33 GPIO10 DIO I/O (remote DTR signal)
34 GPIO11 DIO I/O (remote RTS signal)
35 AIO1 AIO (Not used) Optional analog input