Data Sheet
GE
CAR1212DC series DC-DC converter
Input: -36VD C to -75VDC; Output: 12VDC @ 1200W; 3.3VDC or 5 VDC @ 1A
Status Register Bit Allocation:
Hex Data
Code Byte
Hex Data
Register
Function
Register
Code Byte
Function
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
3.3V_fault
OVSD
Interrupt
Fault detected
PS_remote_OFF
DC_fault
INPUT_fault
N/A
7
6
5
4
3
2
1
0
7
6
5
Busy
DC_ OFF
Output OV Fault
Output OC Fault
Input UV Fault
Temp Fault/warning
CML (communication fault)
None of Below
OV Fault/Warning detected
OC Fault/Warning detected
Input Fault/Warning
Mfr_specific register change
nPower_Good
Fan Fault or Warning
Other fault
Unknown
Vout OV Fault
Vout OV Warning
Vout UV Warning
Vout UV Fault
N/A
N/A
N/A
N/A
IOUT OC Fault
N/A
IOUT OC Warning
N/A
N/A
N/A
N/A
N/A
Vin OV Fault
Vin OV Warning
Vin UV Warning
Vin UV Fault
N/A
N/A
N/A
N/A
OT Fault
OT Warning
N/A
N/A
N/A
N/A
N/A
N /A
Status_mfr_specific
[ 1 – normal
Status_Byte
[ 0 – normal
1 – fault]
80
81
78
0 –fault]
Status_fan_1_2
[ 0 – normal
1 – fault]
Fan 1 Fault
Fan 2 Fault
N/A
Status_word
(includes
Status_byte)
[ 0 – normal
1 – fault]
N/A
4
79
3
Fan 1 Speed Overridden
Fan 2 Speed Overridden
N/A
2
1
0
7
6
5
N/A
Command Descriptions
Status_Vout
[ 0 – normal
1 – fault]
4
Operation (01) : By default the Power supply is turned ON at power
up as long as Power ON/OFF signal pin is active HI. The Operation
command is used to turn the Power Supply ON or OFF via the
PMBus. The data byte below follows the OPERATION command.
7A
3
2
1
0
7
6
5
FUNCTION
Unit ON
Unit OFF
DATA BYTE
80
00
Status_Iout
[ 0 – normal
1 – fault]
4
3
7B
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.
2
1
0
7
6
5
Clear_faults (03): This command clears all STATUS and FAULT
registers and resets the SMBAlert# line.
If a fault still persists after the issuance of the clear_faults
command the specific registers indicating the fault are reset and
the SMBAlert# line is activated again.
Status_input
[ 0 – normal
1 – fault]
4
3
7C
2
1
0
7
6
5
WRITE_PROTECT register (10): Used to control writing to the PMBus
device. The intent of this command is to provide protection against
accidental changes. All supported command parameters may have
their parameters read, regardless of the write_protect settings. The
contents of this register can be stored to non-volatile memory using
the Store_default_code command. The default setting of this
register is disable_all_writes except write_protect 0x80h. This
default cannot be changed.
Status_temperature
[ 0 – normal
4
3
7D
1 – fault]
2
1
0
7
6
5
4
3
2
1
0
FUNCTION
DATA BYTE
Enable all writes
00
80
Disable all writes except write_protect
Disable all writes except write_protect and
OPERATION
Invalid/Unsupported Command
Invalid/Unsupported Data
Packet Error Check Failed
Memory Fault Detected
Processor Fault Detected
Reserved
Status_cml
[ 0 – normal
1 – fault]
Vout_Command (21) : This command is used to change the output
voltage of the power supply. Changing the output voltage should be
performed simultaneously to all power supplies operating in parallel
using the Global Address (Broadcast) feature. If only a single power
supply is instructed to change its output, it may attempt to source
all the required power which can cause either a power limit or
shutdown condition.
7E
Other Communications Fault
Other Memory or Logic Fault
Software programming of output voltage permanently overrides
the set point voltage configured by the Vprog signal pin. The
program no longer looks at the ‘Vprog pin’ and will not respond to
any hardware voltage settings. If power is removed from the
µController it will reset itself into its default configuration looking at
the Vprog signal for output voltage control. In many applications,
October 21, 2013
©2013 General Electric Company. All rights reserved.
Page 12
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
