Intel R2000BB4GS9 数据表
Intel
®
Server System R2000BB Product Family TPS
22
Revision 2.0
oscillate on and off due to temperature recovering condition. The OTP trip level shall have a minimum of 4
°C
of ambient temperature margin.
3.8 Cold Redundancy Support
Power supplies that support cold redundancy can be enabled to go into a low-power state (that is, cold
redundant state) in order to provide increased power usage efficiency when system loads are such that both
power supplies are not needed. When the power subsystem is in Cold Redundant mode, only the needed
power supply to support the best power delivery efficiency is ON. Any additional power supplies; including the
redundant power supply, is in Cold Standby state
Each power supply has an additional signal that is dedicated to supporting Cold Redundancy; CR_BUS. This
signal is a common bus between all power supplies in the system. CR_BUS is asserted when there is a fault in
any power supply OR the power supplies output voltage falls below the Vfault threshold. Asserting the
CR_BUS signal causes all power supplies in Cold Standby state to power ON.
Enabling power supplies to maintain best efficiency is achieved by looking at the Load Share bus voltage and
comparing it to a programmed voltage level via a PMBus command.
Whenever there is no active power supply on the Cold Redundancy bus driving a HIGH level on the bus, all
power supplies are ON no matter their defined Cold Redundant roll (active or Cold Standby). This guarantees
that incorrect programming of the Cold Redundancy states of the power supply will never cause the power
subsystem to shut down or become over loaded. The default state of the power subsystem is all power
supplies ON. There needs to be at least one power supply in Cold Redundant Active state or Standard
Redundant state to allow the Cold Standby state power supplies to go into Cold Standby state.
redundant state) in order to provide increased power usage efficiency when system loads are such that both
power supplies are not needed. When the power subsystem is in Cold Redundant mode, only the needed
power supply to support the best power delivery efficiency is ON. Any additional power supplies; including the
redundant power supply, is in Cold Standby state
Each power supply has an additional signal that is dedicated to supporting Cold Redundancy; CR_BUS. This
signal is a common bus between all power supplies in the system. CR_BUS is asserted when there is a fault in
any power supply OR the power supplies output voltage falls below the Vfault threshold. Asserting the
CR_BUS signal causes all power supplies in Cold Standby state to power ON.
Enabling power supplies to maintain best efficiency is achieved by looking at the Load Share bus voltage and
comparing it to a programmed voltage level via a PMBus command.
Whenever there is no active power supply on the Cold Redundancy bus driving a HIGH level on the bus, all
power supplies are ON no matter their defined Cold Redundant roll (active or Cold Standby). This guarantees
that incorrect programming of the Cold Redundancy states of the power supply will never cause the power
subsystem to shut down or become over loaded. The default state of the power subsystem is all power
supplies ON. There needs to be at least one power supply in Cold Redundant Active state or Standard
Redundant state to allow the Cold Standby state power supplies to go into Cold Standby state.
3.8.1
Powering on Cold Standby supplies to maintain best efficiency
Power supplies in Cold Standby state shall monitor the shared voltage level of the load share signal to sense
when it needs to power on. Depending upon which position (1, 2, or 3) the system defines that power supply
to be in the cold standby configuration; will slightly change the load share threshold that the power supply shall
power on at.
when it needs to power on. Depending upon which position (1, 2, or 3) the system defines that power supply
to be in the cold standby configuration; will slightly change the load share threshold that the power supply shall
power on at.
Table 17. Example Load Share Threshold for Activating Supplies
Enable Threshold for V
CR_ON_EN
Disable Threshold for V
CR_ON_DIS
CR_BUS De-asserted / Asserted
States
States
Standard Redundancy
NA; Ignore dc/dc_ active# signal; power supply is always ON
OK = High
Fault = Low
Fault = Low
Cold Redundant Active
NA; Ignore dc/dc_ active# signal; power supply is always ON
OK = High
Fault = Low
Fault = Low
Cold Standby 1 (02h)
3.2V (40% of max)
3.2V x 0.5 x 0.9 = 1.44V
OK = Open
Fault = Low
Fault = Low
Cold Standby 2 (03h)
5.0V (62% of max)
5.0V x 0.67 x 0.9 = 3.01V
OK = Open
Fault = Low
Fault = Low
Cold Standby 3 (04h)
6.7V (84% of max)
6.7V x 0.75 x 0.9 = 4.52V
OK = Open
Fault = Low
Fault = Low
Notes:
Maximum load share voltage = 8.0V at 100% of rated output power
These are example load share bus thresholds; for a given power supply, these shall be customized to maintain
the best efficiency curve for that specific model.
Maximum load share voltage = 8.0V at 100% of rated output power
These are example load share bus thresholds; for a given power supply, these shall be customized to maintain
the best efficiency curve for that specific model.
3.8.2
Powering on Cold Standby supplies during a fault or over current condition
When an active power supply asserts its CR_BUS signal (pulling it low), all parallel power supplies in cold
standby mode shall power on within 100
standby mode shall power on within 100
μsec
3.8.3
BMC Requirements
The BMC uses the Cold_Redundancy_Config command to define/configure the power supply’s roll in cold
redundancy and to turn on/off cold redundancy.
redundancy and to turn on/off cold redundancy.