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Kontron ETXexpress-AI User Manual

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Kontron ETXexpress-AI User’s Guide



62

Table 16: ATX Mode

State

PWRBTN#

PWR_OK

V5_StdBy

PS_ON#

VCC

G3

x

x

0V

x

0V

S5

high

low

5V

high

0V

S5 -> S0

PWRBTN Event low -> high 5V

high -> low

0 V-> VCC

S0

high

high

5V

low

VCC

Single Supply Mode:

In single supply mode the module starts automatically when VCC power is
connected and Power Good input is open or at high-level (internal PU to
3.3V). PS_ON# is not used in single supply mode.

To power on the module from the S5 state, press the power button or reconnect
VCC.

Table 17: Single Supply Mode

State

PWRBTN

PWR_OK

V5_StdBy

VCC

G3

x

x

x

0

G3 -> S0

high

open / high

x

connecting
VCC

S5

high

open / high

x

VCC

S5 -> S0

PWRBTN Event

open / high

x

reconnecting
VCC

NOTES: 1) Columns marked “x” are not relevant for the specified power

state.
2) All ground pins have to be tied to the ground plane of the carrier
board.

4.4.11

Miscellaneous Circuits

Speaker

The implementation of this subsystem complies with the COM Express™
Specification. For additional implementation information, refer to the PICMG
COM Express™ Design Guide.

Battery

The implementation of this subsystem complies with the COM Express™
specification. For additional implementation information, refer to the PICMG
COM Express™ Design Guide

on the PICMG website.