User Manual

BTM-350 Pins Function
No. Pin Name Pin Type Pin description
1 GND GND Common ground
2 RF_IO Analogue Antenna interface
3 GND GND Common ground
4 PIO[0] Bi-directional Programmable I/O terminal, RX Enable
5 PIO[1] Bi-directional Programmable I/O terminal, TX Enable
6 PIO[2] Bi-directional Programmable I/O terminal, external CLK_REQ
7 PIO[3] Bi-directional Programmable I/O terminal
8 SPK_N Analogue Speaker output negative
9 SPK_P Analogue Speaker output positive
11 MIC_N Analogue Microphone input negative
10 MIC_P Analogue Microphone input positive
12 GND GND Common ground
13
NC No Connection Reserved
14 VREG_EN CMOS input Internal Regulator enable control input
15 AIO[0] Bi-directional Programmable Input/Output Line
16 AIO[1] Bi-directional Programmable Input/Output Line
17 UART_RTS CMOS output UART request to send(active low)
18 UART_TX CMOS output UART data output
19 UART_RX CMOS input UART data input
20 UART_CTS CMOS input UART clear to send(active low)
21
PIO[4] Bi-directional Programmable I/O terminal
22
USB_DN Bi-directional USB data minus
23
USB_DP Bi-directional USB data plus
24
PCM_IN CMOS input Synchronous data input
25
PCM_SYNC Bi-directional Synchronous data sync
26
PCM_CLK Bi-directional Synchronous data clock
27
PCM_OUT CMOS output Synchronous data output
28
PIO[5]
Bi-directional Programmable I/O terminal
29
RESETB CMOS input
Reset input (Active low)
30
SPI_CLK CMOS input Serial Peripheral Interface clock
31
SPI_MISO CMOS output Serial Peripheral Interface data output
32
V_CHG Power Lithium lion battery charger input
33
GND GND Common ground
34 VBAT
Power Battery power input
35
SPI_MOSI CMOS input Serial Peripheral Interface data input
36
SPI_CSB CMOS input Chip select for Synchronous Serial Interface(active low)
37
LED[1] Open drain output Current sink to drive LED
38
LED[0] Open drain output Current sink to drive LED
39 1.8V Power 1.8V Internal Power Output
40
PIO[9]
Bi-directional Programmable I/O terminal
41
PIO[10] Bi-directional Programmable I/O terminal
42
PIO[11] Bi-directional Programmable I/O terminal