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12048231 Rev. 00 (Draft)
DATA MODUL AG | www.data-modul.com
4.27. Infrared-IF Connector
Reference Designator:
– J3
1.27mm pitch Socket Strip, Top Entry SMT, 20 circuits
Description
The Infrared-IF connector provides Data Modul own developed Infrared Keyboard Interface.
The STM32 board controller converting the IR to USB HID Keyboard compatible device to SMARC.
Interfaces used
I2C-SW bus of the STM32 board controller
KBD_RED, KBD_GREEN and KBD_ORANGE status signals of the STM32 board controller
INFRARED_IN signal to the STM32 board controller
Power 5.0V (S5); max. current: 250 mA
Connector drawing and contact-numbering scheme
Figure 36 Connector
– J3
Pinout
J3
Pin
Signal / Function
Pin Type
Signal Description
1
GND
GND
Connected to ground potential of the PCB
2
NC
NC
Not connected
3
KBD_LED_RED
O (3.3V)
LED Driver for status indication (max. 20mA)
4
KBD_LED_GREEN
O (3.3V)
LED Driver for status indication (max. 20mA)
5
NC
NC
Not connected
6
KBD_LED_ORANGE
O (3.3V)
LED Driver for status indication (max. 20mA)
7
GND
GND
Connected to ground potential of the PCB
8
I2C-SW_SDA
IO (CMOS 3,3V) I2C data line
9
GND
GND
Connected to ground potential of the PCB
10
I2C-SW_SCL
O (CMOS 3,3V) I2C clock line
11
GND
GND
Connected to ground potential of the PCB
12
GND
GND
Connected to ground potential of the PCB
13,14,
15,16,
17
NC
NC
Not connected
18
GND
GND
Connected to ground potential of the PCB
19
V_5V0_S5
Power
5.0V (S5) power supply for IR device (max.250mA)
20
INFRARED_IN
I
Input from IR device
