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COMe-cTH6 User’s Guide

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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

high

low

high

low

high

S5 -> S0

PWRBTN Event

low -> high

high -> low

0V -> VCC

high

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

high

N/A

4.75V – 20V

S3 -> S0

high

open / high

N/A

4.75V – 20V

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

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