Owner's manual

BTM-220 Pin Function
Pin No. Pin Name Pin Type Description
1 GND GND
Common ground
2 PVCC Power
Power Amp. Power Supply(3.3V)
3 AIO(0) Bi-directional
Programmable I/O terminal
4 AIO(1) Bi-directional
Programmable I/O terminal
5 PIO(0) Bi-directional
Programmable I/O terminal, RX Enable
6 PIO(1) Bi-directional
Programmable I/O terminal, TX Enable
7 PIO(2) Bi-directional
Programmable I/O terminal, USB_PULL_UP
8 PIO(3) Bi-directional
Programmable I/O terminal, USB_WAKE_UP
9 PIO(4) Bi-directional
Programmable I/O terminal, USB_ON
10 GND GND
Common ground
11 PIO(5) Bi-directional
Programmable I/O terminal, USB_DETACH
12 PIO(6) Bi-directional
Programmable I/O terminal, CLK_REQ
13 PIO(7) Bi-directional
Programmable I/O terminal
14 PIO(8) Bi-directional
Programmable I/O terminal
15 PIO(9) Bi-directional
Programmable I/O terminal
16 RESET CMOS input
Reset input of module, Active low reset
17 VCC Power
Module power supply input
18 GND GND
Common ground
19 GND GND
Common ground
20 USB_DP Bi-directional
USB data plus
21 USB_DN Bi-directional
USB data minus
22 PCM_SYNC Bi-directional
Synchronous data sync
23 PCM_IN CMOS input
Synchronous data input
24 PCM_OUT CMOS output
Synchronous data output
25 PCM_CLK Bi-directional
Synchronous data clock
26 UART_RX CMOS input
UART data input
27 UART_TX CMOS output
UART data output
28 UART_RTS CMOS output
UART request to send(active low)
29 GND GND
Common ground
30 UART_CTS CMOS input
UART clear to send(active low)
31 SPI_MOSI CMOS input
Serial Peripheral Interface data input
32 SPI_CSB CMOS input
Chip select for Synchronous Serial Interface(active
low)
33 SPI_CLK CMOS input
Serial Peripheral Interface clock
34 SPI_MISO CMOS output
Serial Peripheral Interface data output
35 PIO(11) Bi-directional
Programmable I/O terminal
36 PIO(10) Bi-directional
Programmable I/O terminal
37 RF_IO Analogue
Antenna interface
38 GND GND
Common ground