User's Manual

6
OPENBRAIN Technologies Co., LTD.
Pin Description
Pin No Name Description
1 VDD Positive supply (3.0V~4.2V)
2 RESETB Reset if low. Input debounced so must be low for > 5ms to cause a
reset
3 GND Ground
4 GND Ground
5 UART_TX UART data output
6 UART_RX UART data input
7 PCM_OUT PCM Synchronous data out
8 PCM_SYNC PCM Synchronous data sync
9 PCM_IN PCM Synchronous data in
10 PCM_CLK PCM Synchronous data clock
11 MIC+ Microphone differential, Input P
12 MIC- Microphone differential, Input N
13 SPK+ Speaker differential output P
or single ended output
14 SPK- Speaker differential output N
or single ended output
15 SPI_MISO Serial Peripheral interface data output
16 SPI_CSB Chip select for synchronous serial peripheral interface
17 SPI_MOSI Serial Peripheral interface data input
18 SPI_CLK Serial Peripheral interface clock