USR-S12 User Manual www.usr.so
Jinan USR IOT Technology Limited Page 5/ 20 tec@usr.cn
Instructions:
Pin Description Name Type Instruction
6, 7 GND GND Power Ground
15, 16 5VD 5VD Power +5V@350mA
1 SPI interface data SPI_MISO I/O SPI interface, used to
connect with SDcard
2 SPI interface data SPI_MOSI I/O
3 SPI interface clock SPI_CLK I/O
17 SPI interface 片选 SPI_CS1 I/O
4 Module start status
indicator
nReady O，IPU Module boot up, output
“0”, otherwise output
“1”
5 Module reset nRST I，IPD Low level reset, reset
time >300ms
8 UART receive data UART_RXD I，IPD UART function
9 UART send data UART_TXD O，IPD
10 Restore factory
defaults
nReload I，IPD Input low level “0”, pull
high after 5s, module
restore
11 Out put 1.8V 1V8_Output O 1.8V@300mA, applied
to Ethernet
12 Audio output -R OUT_R A Audio output interface,
connect with speakers
13 Audio gnd AGND Power
14 Audio output -L OUT_L A
18 Reserved Reserved I/O,IPD Reserved, vacant
19 General
programmable IO
GPIO_19 I/O,IPD
20 General
programmable IO
GPIO_20 I/O,IPD
21 Reserved Reserved I/O,IPD Reserved, vacant
22 Reserved Reserved I/O,IPD Reserved, vacant
23 Ethernet output+ PHY_TX+ O 1.8V level interface
(supply circumscribed
1.8V , reference
voltage , Pin11）
24 Ethernet output- PHY_TX- O
25 Ethernet input- PHY_RX- I
26 Ethernet input+ PHY_RX+ I
27 USB input- USB- I USB interface, connect
with USB flash disk
28 USB input+ USB+ I
Note:
1.I-Input, O-Output, P-Power, IPU-Internal Pull Up, IPD: Internal Pull Down, A:Analog
Meanwhile, S12 configurate two 3 pin SMD connect interface socket, respectively is 5V
power input and audio stereo output.
