User's Manual l MB-SMARC-3 UM 0100 l © 2022, TQ-Systems GmbH
Page 18
3.6.17
GPIO pin header
The MB-SMARC-3 provides a pin header for direct access to the SMARC module’s GPIOs.
Table 13:
GPIO pin header, X27
Illustration 17:
GPIO pin header
3.6.18
Fan Connector
The MB-SMARC-3 provides a connector for 12 V fans with a standard 3-pin connector.
Table 14:
12 V Fan Connector, X31
Illustration 18:
12 V Fan Connector
3.6.19
Power and Reset Button Connector
A power and a reset button can be connected to the MB-SMARC-3.
•
Connector type:
Molex 53398-0371
•
Mating connector:
Molex 51021-0300
Table 15:
Power and Reset Button Connector, X51
Illustration 19:
PWR and RST Button
3.6.20
SPI Flash Socket
The MB-SMARC-3 provides the socket X29 for SPI flash memory. This is useful if a BIOS update fails or for BIOS development
purposes. SPI flash memory with SO8W package can be inserted. It depends on the SMARC module used whether a certain flash
device is supported.
If the “BOOT_SEL2#” switch is “ON”, the BIOS from the SPI flash in the socket is active for TQ x86-modules.
3.6.21
(Front) Power LED
The MB-SMARC-3 provides a power LED. It is visible on the front if an appropriate light pipe is used.
Table 16:
(Front) Power LED
PCB Text
Function
PWR LED
Off: Carrier is not powered
Green: Module in operation (S0 state)
Blue: Module is turned off or in sleep state (S5 – soft off or S3/S4 – sleep)
Signal
Pin
Signal
GPIO0_1V8
1
2 GPIO1_1V8
GPIO2_1V8
3
4 GPIO3_1V8
GPIO4_1V8
5
6 GPIO5_1V8
GPIO6_1V8
7
8 GPIO7_1V8
GPIO8_1V8
9
10 GPIO9_1V8
GPIO10_1V8
11
12 GPIO11_1V8
GPIO12_1V8
13
14 GPIO13_1V8
NC
15
16 NC
V_1V8
17
18 GND
V_1V8
19
20 GND
Pin
Signal
Remark
1
GND
–
2
Fan Voltage
Output voltage (0 to 12 V PWM)
3
SENSE
Sense input for fan speed
(for open drain outputs of fans)
Pin
Signal
1
PWR_BTN#
2
GND
3
RST_BTN#
1
1
2
20
1
19
