Status Leds D1-D4; Pwr_Ok Signal - Congatec conga-CEVAL User Manual

3.2.1

Status LEDs D1-D4

The four status LEDs D1, D2, D3 and D3 indicate different power states of the conga‑CEVAL. The LEDs indicate if the power rail is ON or OFF
even if the power rail is generated by ATX PSU or by onboard voltage regulator. Refer to the following table for detailed information.
Power LEDs
Table 3
Power state
LEDs D1-D4
All Off No power applied.
D1 Indicates that 12V is present on the baseboard
D2 Indicates that 5V standby is present on the baseboard
D3 Indicates that 5V is present on the baseboard
D4 Indicates that 3.3V is present on the baseboard
3.2.2

PWR_OK Signal

The COM Express™ specification defines the signal PWR_OK, which is a HIGH active input from the main power supply to the module and
indicates whether the power is good.
Jumper X11 on the conga‑CEVAL provides the ability to choose different settings for this signal.
Configuration
Jumper X11
1 ‑ 2 Add 3.3V Pullup with 10K to signal PWR_OK.
3 ‑ 4 Connect PWRGOOD of ATX power supply (default).
5 ‑ 6 Connect PWRGOOD of onboard DCDC regulator.
Connector Type
X11: 2.54 mm grid jumper.
Copyright © 2012 congatec AG CEVA_c_m10
LEDs D1-D4
D2 D1 D3 D4
PWRGOOD Config.
(X11)
5 3 1
6 4 2
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