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ESM-BYT User’s Manual

2.4.2.1.8 Power Signals

Signal

Signal Description

VCC_5V_SBY

Standby power input: +5.0V nominal. See Electrical Specifications for allowable

input range. If VCC5_SBY is used, all available VCC_5V_SBY pins on the

connector(s) must be used. Only used for standby and suspend functions. May be

left unconnected if these functions are not used in the system design.

VCC_RTC

Real-time clock circuit-power input. Nominally +3.0V.

2.4.2.1.9 Power & System Management Signals

Signal

Signal Description

SUS_S3#

Indicates system is in Suspend to RAM state. Active low output.

SUS_S4#

Indicates system is in Suspend to Disk state. Active low output.

SUS_S5#

Indicates system is in Soft Off state.

BATLOW#

Indicates that external battery is low

PWRBTN#

Power button to bring system out of S5 (soft off), active on rising edge.

SMB_CK

System Management Bus bidirectional clock line.

SMB_DTA

System Management Bus bidirectional data line.

SMB_ALERT#

System Management Bus Alert - input can be used to generate an SMI# (System

Management Interrupt) or to wake the system.

SUS_STAT#

Indicates imminent suspend operation.

PWR_OK

Power OK from main power supply

SYS_RESET#

Reset button input. Active low input.

WAKE0#

PCI Express wake up signal.

WAKE1#

General purpose wake up signal.

2.4.2.1.10 LVDS Signals

Signal

Signal Description

LVDS_I2C_CK

I2C clock output for LVDS display use.

LVDS_I2C_DAT

I2C data line for LVDS display use.

2.4.2.1.11 I2C Signals

Signal

Signal Description

I2C_CK

General purpose I2C port clock output.

I2C_DAT

General purpose I2C port data I/O line.

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