User's Manual

FreeWings Technologies Co., Ltd
Page 6 of 11
FW3817-30 Bluetooth Audio Module Datasheet V1.5
6.2 Module Pin descriptions
Pin No. Pin Name Pin Type Description
1
GND VSS Ground
2
USB_P Bidirectional USB data plus
3
USB_N Bidirectional USB data minus
4
PIO15
Bidirectional with strong pull-up
MFB key input
5
PIO14 Bidirectional with strong pull-up Skip+ key input
6
PIO16
Bidirectional with strong pull-up
Volume+ key input
7
PIO9
Bidirectional with strong pull-down
External PA enable output high
8
PIO1 Bidirectional with strong pull-up Volume- key input
9
NC N.C NOT CONNECTED
10
PIO17
Bidirectional with strong pull-down
Skip- key input
11
RSTn Input with strong pull-up
Reset if low. Pull low for minimum
5ms to cause a reset.
12
SPI_MOSI Bidirectional with weak pull-down SPI_MOSI for debug only
13
SPI_CLK Bidirectional with weak pull-down SPI_CLK for debug only
14
SPI_CSB Bidirectional with weak pull-down SPI_CSB active low for debug only
15
SPI_MISO Bidirectional with weak pull-down SPI_MISO for debug only
16
LED1 Open drain output LED driver
17
LED0 Open drain output LED driver
18
VREG_EN Power on/off key input Power on/off input key indication
19
VBAT Battery positive terminal Power supply input for 2.8~4.2V
20
VCHG Charger voltage input Internal charger input for charging
21
1V8 1.8V output 1.8V output for keys
22
GND VSS Ground
23
VBAT_SEN
SE
Battery Sense Battery charger sense input
24
PIO6 Bidirectional with strong pull-down Programmable input/output line
25
CHG_EXT Charger external pin
External battery charger control.
External battery charger transistor base
control when using external charger
boost. Otherwise leave unconnected.
26
LED2 Open drain output LED driver
27
NC N.C Not Connected
28
LINE_RP Analog input Line input, positive right
29
LINE_RN Analog input Line input, negative right
30
AIO0 Analog input
ADC input used only to test
temperature of battery
31
LINE_LP Analog input Line input, positive left
32
LINE_LN Analog input Line input, negative left