Linkplay A31 - Mechanical Dimension

Doc Title Wireless smart audio module
Number
WMB20150921
Version
1.
4
Document No.: WMB20150921 Page 8 of 21
14 USB_DP USB_DP I/O
15 I2C_CLK I2C_CLK O I2C interface, in module 4.7K
resistor pull-up
16 I2C_SDA I2C_SDA I/O
17
Module reset CPU_RST I,IPU
Reset with pull down, reset
time >300ms
18
Restore factory
setting
nReload I/O, IPU
First Input 0 and keep for more
than 5 seconds then change to 1,
it will go back to factory setting,
in module 4.7K resistor pull-up
19 GPIO GPIO5 I/O, IPU in module 4.7K resistor pull-up
22 GPIO GPIO2 I/O, IPU in module 4.7K resistor pull-up
23 GPIO GPIO1 I/O, IPU in module 4.7K resistor pull-up
24 UART receive UART_RXD I, Need keep UART_TXD high
during chip boot-up
25 UART transmit UART_TXD O, IPU
26 GPIO GPIO4 I/O, IPU
27 GPIO GPIO3 I/O,IPU
29 SDIO Data SD_D2 I/O SDIO, GPIO 10K Pull-up
30 SDIO CMD SD_CMD O SDIO CMD, GPIO, 10K IPU
31 SDIO Data SD_D0 I/O SDIO Data0, GPIO,10K IPU
32 SDIO Detect SD_CD I SDIO detect, GPIO, 10K IPU
33 SDIO WP SD_WP I
Write Protect, GPIO, 10K IPU,
If MICRO SD (TF), need put
this pin to GND
34 SDIO Data SD_D1 I/O SDIO Data 1, GPIO, 10K IPU
35 SDIO CLK SD_CLK O SDIO CLK, GPIO
36 SDIO Data SD_D3 I/O SDIO Data 3, GPIO, 10K IPU
Table 2-1 LinkPlay WiFi Audio A31 module pin description
Notes：
1. I: Input, O: Output, P: Power, IPU: Internal Pull Up, IPD: Internal Pull Down, A: Analog.
2.2. Mechanical dimension
LinkPlay WiFi Audio A31 module has the physical dimension of 28.5 x 38.7mm. The detailed layout shows below.
The unit is in mm.