RM23712 TPS
40
3.5 Smart On Function
3.5.1 PMBus command for Smart On
3.5.1.1 Hardware Connection
Before enabling Smart On function, make sure pin B22 (SMART ON) on output golden finger of each
PSU is connected together.
3.5.1.2 Configuring Smart On with SMART_ON_CONFIG (D0h)
The PMBus manufacturer specific command MFR_SPECIFIC_00 is used to configure the operating
state of the power supply related to Smart On. We will call the command SMART_ON_CONFIG
(D0h). Below is the definition of the values used with the Read-Write Byte SMBus protocol with
PEC.
Table 39.SMART_ON_CONFIG
The default state of power supply is in Standard Redundancy mode. Power supply need to be
re-specified a state whenever initial power on or any power supply in the system is in fault situation.
The SMART_ON_CONFIG command will reset to 00h (Standard Redundancy) when any fault or
over current happened. The faults include AC loss, over hot spot temperature, over ambient
temperature, +12V short internally (under voltage), +12V over voltage, fan locked, D2D controller
soft-start short.
3.5.2 Smart Standby Power Supply Operating State
A power supply is put into Smart Standby whenever PSON# is asserted, and SMART_ON_CONFIG
value is set to 02h.In the Smart Standby mode the power supply must:
1. Power ON when Smart_On bus is driven LOW
2. Keep PWOK asserted
3. No PMBus fault or warning conditions reported via STATUS commands
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