Kontron COMe-cTH6 - Manual (Page 37)

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COMe-cTH6 User’s Guide
www.kontron.com
5.11 Power Supply
The COMe-cTH6 COM has a wide range of power inputs, from 4.75V to 20V DC. The supply voltage is applied through
the VCC_12V pins on the COM Express connector. In ATX mode the 5V standby voltage range is from 4.75V to 5.25V.
RTC power is provided on the VCC RTC pins. VCC_12V may or may not collapse in suspend states S3, S4, S5
5.11.1 ATX Mode / Single Supply Mode
ATX Mode
When an ATX power supply is connected, PWR_OK is set to low-level and VCC is off. Pressing the power button
enables the ATX PSU to turn on VCC and set PWR_OK to high-level. The ATX PSU is controlled by the PS_ON# signal,
which is generated by SUS_S3#.
State PWRBTN# PWR_OK V5_StdBy PS_ON# VCC
S3 high low 5V high 0V
S5 high low 5V high 0V
S5 -> S0 PWRBTN Event low -> high 5V high -> low 0V -> VCC
S0 high high 5V low VCC
Table 9: Power Supply States in ATX Mode
Single Supply Mode:
Main power (4.75V – 20V) is provided on the COM Express VCC_12V pins. Standby power, if needed, is also provided
on the VCC_12V pins. The VCC_5V_SBY pins may be floating or may be tied to a 5V source on the Carrier. RTC power is
provided on the VCC_RTC pins.
To power on the module from the S5 state, press the power button.
State PWRBTN# PWR_OK V5_StdBy VCC12V
S3 high N/A N/A 4.75V – 20V
S3 -> S0 high open / high N/A 4.75V – 20V
S5 high N/A N\A 4.75V – 20V
S5 -> S0 PWRBTN Event open / high N\A 4.75V – 20V
Table 10: Power Supply States in Single Supply Mode
NOTES: 1) Columns marked “N/A” are not applicable for the specified power mode.
2) All ground pins have to be tied to the ground plane of the carrier board.
DRAFT COPY FOR REVIEW ONLY
DRAFT COPY FOR REVIEW ONLY