15 smbus – BECKHOFF CB4051 User Manual
Page 34
Chapter: Connectors
SMBus
page 34
Beckhoff New Automation Technology CB4051
4.15 SMBus
The CB4051 can communicate with external devices via the SMBus protocol. The signals for this protocol
are available through a standard IDC socket connector with a spacing of 2.54 mm. A 3.3 volt power
supply is also available for these SMBus devices. Additionally, you can use this connector to access the
PWRBTN# and PS_ON# signals used for power control. If PWRBTN# is held low for four seconds an
unconditional hardware power-down event will occur.
Pin
Name
Description
1
3.3V
3.3 volt supply
2
CS-SMB-CLK SMBus clock
3
CS-SMB-DAT SMBus data
4
SMB-ALERT# SMBus alert
5
PWRBTN#
power button
6
PS_ON#
power supply on
7
GND
ground