User Manual
BM23SPKA1NB9
Version: 0.94 - 5 - 22/9/2014
Pin Definition for ROM module
Pin No.
I/O
Name
Description
1
I/O
P00
GPIO, default pull-low input.
UART_TX_IND: BT Module use to inform MCU
2
I/O
RFS0
Receive frame synchronization
3
I/O
TFS0
Transmit frame synchronization
4
I/O
SLK0
Serial clock
5
I
DR0
Serial data receive
6
O
DT0
Serial data transmit
7
I/O
P04
GPIO, default pull-high input
8
I
EAN
Embedded ROM/External Flash enable
High: ROM mode;
Low: External Flash mode
9
AI
MIC1_P
Mic 1 mono differential analog positive input
10
AI
MIC1_N
Mic 1 mono differential analog negative input
11
AP
MIC_BIAS
Power output, microphone biasing voltage
12
AP
VDDA
Power output, reserve for external cap to fine tune
audio frequency response, no need to add power
to this pin
13
AI
AIR
Stereo analog line in, R-channel
14
AI
AIL
Stereo analog line in, L-channel
15
P
GND
Ground
16
I/O
RST_N
System Reset Pin,
Low: reset
17
--
NC
--
18
--
NC
--
19
P
VDDIO
Power output, VDDIO pin, no need to add power to
this pin
20
I/O
P15
GPIO, default pull-high input
21
I/O
P01
GPIO, default pull-high input
22
P
ADAP_IN
Power adaptor input
23
P
BAT_IN
Battery input
24
P
AMB_DET
ADC analog input 1