RM23712 TPS
28
See Table 22.
Table 29.PWOK signal characteristics
Open collector/drain output from power supply.
Pull-up to +3.3V located in the power supply.
Logic level low voltage, I
sink
=4mA
Logic level high voltage, I
sink
=50μA
Sink current, Alert
#
=low
Source current, Alert
#
=high
3.2.4.4 A0
PSU Module Address Line 0. This signal line is provided for determining the address for the specific
PSU FRU and SMBus address. The pull-up resister should be located in power supply.
3.2.4.5 A1
PSU Module Address Line 1. This signal line is provided for determining the address for the specific
PSU FRU and SMBus address. The pull-up resister should be located in power supply.
3.2.4.6 12V
RS
and Return Sense
The power supply has remote sense return (Return Sense) to regulate out ground drops for all
output voltages. The power supply uses remote sense to regulate out drops in the system for the
main outputs. The +12V output only uses remote sense with reference to the Return Sense signal.
The remote sense input impedance to the power supply must be greater than 10Ω on the main
outputs and is 10Ω on Return Sense. These are the values of the resistors connecting the
remote senses to the output voltage internal to the power supply. Remote sense is able to regulate
out a minimum of 300mV of drop on the +12V output. The remote sense return is able to regulate
out drops of 300mV as well. The current in any remote sense line shall be less than 5mA to prevent
voltage sensing errors. The power supply operates within specification over the full range of voltage
drops from the power supply’s output connector to the remote sense points.
3.2.4.7 Present
This signal is connected to the power supply’s output ground.
3.2.4.8 SDA and SCL
One pin is the serial clock (SCL), and the other pin is used for serial data (SDA). The SCL and SDA
signals are pulled up by system, both pins are bi-directional, open drain signals, and are used to
form a serial bus.
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