Chenbro RM23712 User Manual

RM23712 TPS
30
The power supply shall have minimum of two thermal sensors to measure the inside environmental
(T
in_env
) and critical component (T
Heatsink
) temperature. The thermal sensors shall be part of a
protection circuit to protected against over temperature conditions caused by loss of fan cooling or
excessive ambient temperature. In an critical Over temperature condition, specified in below table,
the PSU shall be shutdown with the exception of the auxiliary output.
The power supply shall alert the system of the OTP condition via SMBAlert
#
and fail LED indicator.
The power supply will auto recover from this condition, when the temperature is dropping within
specification again. If the OTP is caused due to a defective fan, the power supply shall latch off and
not auto recovery.
Table 32.Over Temperature Protection
Condition
Warning in
o
C
Critical in
o
C
Timing for
SMBAlert
#
/LED
T
in_env
60
65
1msec
T
Heatsink
70
75
1msec
3.3.4 Fan Failure Protection
The power supply shall have a circuit internal to monitor the power supply internal fan. The fan
failure protection shall monitor the fan speed and should assert SMBAlert# and fail LED signal in
case the fan Rotation Per Minute (RPM) drop lower threshold or set PWM Δ as defined in below
table.
The fan failure state shall shut down and latch off the main outputs, and shall be cleared by toggling
the PSON# signal or by an AC input recycle.
Table 33.Fan Failure Protection
Condition
FAN RPN
Timing for
SMBAlert
#
/LED
Critical
1000
1sec
3.4 Power Supply Management
3.4.1 Hardware Layer
The serial bus communication devices for Power Supply Management Controller (PSMC) and Field
Replacement Unit (FRU) in the power supply shall be compatible with both SMBus 2.0 “high
power” and I2C Vdd based power and drive specification.
This bus shall operate at 3.3V but be tolerant to 5V pull-ups. The power supply should not have any
internal pull-ups on the SMBus, pull-ups shall be located on system side.
Two pins are allocated on the power supply. One pin is the serial clock (SCL). The second pin is
used for serial data (SDA). Both pins are bi-directional and are used to form a serial bus. The
device(s) in the power supply shall be located at an address(s) determined by addressing pins A0
and A1 on the power supply module. The circuits inside the power supply shall derive their 3.3V
power from the 12Vsb bus through a buffer. Device(s) shall be powered from the system side of the

Chenbro RM23712 Specifications

General

Brand	Chenbro
Model	RM23712
Category	Racks & Stands
Language	English