Data Sheet
GE
CP2725AC54TE CPL High Efficiency Rectifier
100-120/200-277VAC input; Default Outputs: ±54VDC @ 2725W, 5VDC @ 4W
bit. To be certain that each power supply responded to the
global instruction, a READ instruction should be executed to
each power supply to verify that the command properly
executed. The GLOBAL BROADCAST command should only be
executed for write instructions to slave devices.
data value from the controller and x is the ‘real’ value either
being set or returned.
For example, to set the output voltage to 50.45VDC, Multiply the
desired set point by the m constant, 50.45 x 400 = 20,180.
Convert this binary number to its hex equivalent: 20,180b =
0x4ED4. The result is sent LSB=0xD4 first, then MSB=0x4E.
Note: The PCA9541 i2c master selector does not respond to the
GLOBAL BROADCAST command.
The constants are
Read back delay: The power supply issues the SMBAlert #
notification as soon as the first state change occurred. During
an event a number of different states can be transitioned to
before the final event occurs. If a read back is implemented
rapidly by the host a successive SMBAlert# could be triggered
by the transitioning state of the power supply. In order to avoid
successive SMBAlert# s and read back and also to avoid
reading a transitioning state, it is prudent to wait more than 2
seconds after the receipt of an SMBAlert# before executing a
read back. This delay will ensure that only the final state of the
power supply is captured.
FUNCTION
Output voltage
Output voltage shutdown
Output Current
Temperature
Input Voltage
Input Power
Fan Speed setting ( % )
Fan speed in RPM
Operation
Write / read
m
400
b
0
R
0
read
read
read
read
read
read
5
1
1
1
1
0
0
75
0
0
0
0
0
0
0
0
0
100
PMBusTM Command set:
Command
Successive read backs: Successive read backs to the power
supply should not be attempted at intervals faster than every
one second. This time interval is sufficient for the internal
processors to update their data base so that successive reads
provide fresh data.
Hex
Code
Data
Field
Function
Operation
Clear_Faults
Vout_command
Vout_OV_fault_limit
Read_status
LEDs test ON
LEDs test OFF
Service_LED_ON
Service_LED_OFF
Enable_write
01
03
21
40
D0
D2
D3
D4
D5
D6
D7
D8
D9
DA
DC
DD
DE
DF
E0
1
0
2
2
10
0
0
0
0
0
0
0
0
0
2
3
3
Output ON/OFF
Clear Status
Set Vout
Set OV fault limit
Read Status, Vout, Iout, T
Test LEDs
Device ID: Address bits A2, A1, A0 set the specific address of
the power supply. The least significant bit x (LSB) of the address
byte configures write [0] or read [1] events. In a write
command the system instructs the power supply. In a read
command information is being accessed from the power
supply.
Service LED
Enable EEPROM write
Disable EEPROM write
Latch upon failure
Hiccup
Perform isolation test
Read Vin and Pin
Firmware revisions
Accumulated ON state
Fan speed control
Stop fan control
Fan control & speed
Production test feature
Disable_write
Inhibit_restart
Auto_restart
Address Bit
7
1
1
1
0
6
1
0
0
0
5
1
0
1
0
4
0
0
0
0
3
2
1
0
PCA9541
A2 A1 A0 R/W
A2 A1 A0 R/W
A2 A1 A0 R/W
Isolation_test
Micro controller
External EEPROM
Global Broadcast
Read_input_string
Read_firmware_rev
Read_run_timer
Fan_speed_set
Fan_normal_speed
Read_fan_speed
Stretch_LO_25ms
0
0
0
0
MSB
LSB
3
0
4
0
E1
E2
The Global Broadcast instruction executes a simultaneous
write instruction to all power supplies. A read instruction
cannot be accessed globally. The three programmable address
bits are the same for all I2C accessible devices within the
power supply.
Command Descriptions
Operation (01h) : By default the Power supply is turned ON at
power up as long as ENABLE is active LO. The Operation
command is used to turn the Power Supply ON or OFF via the
PMBus. The data byte below follows the OPERATION command.
PMBusTM Commands
Standard instruction: Up to two bytes of data may follow an
instruction depending on the required data content. Analog
data is always transmitted as LSB followed by MSB. PEC is
mandatory and includes the address and data fields.
FUNCTION
Unit ON
Unit OFF
DATA BYTE
0x80
0x00
1
S
8
1
A
8
1
A
Slave address
Wr
Command Code
To RESET the power supply cycle the power supply OFF, wait at
least 2 seconds, and then turn back ON. All alarms and
shutdowns are cleared during a restart.
8
1
A
8
1
A
8
PEC
1
A
1
P
Low data byte
High data byte
Clear_faults (03h): This command clears information bits in
the STATUS registers, these include:
Master to Slave
Slave to Master
SMBUS annotations; S – Start , Wr – Write, Sr – re-Start, Rd – Read,
A – Acknowledge, NA – not-acknowledged, P – Stop
Isolation OK
Isolation test failed
Restarted OK
Direct mode data format: The Direct Mode data format is
supported, where y = [ mX + b ] x 10R . In the equation, y is the
Invalid command
January 30, 2014
©2013 General Electric Company. All rights reserved.
Page 12
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