Data Sheet
GE
CAR0812DC Series DC-DC Converter
Input: -36VDC to -75VDC; Output: +12 VDC @ 850W; 3.3VDC or 5 VDC @ 1A
Hex
Code
7E
Data
Field
1
Status Register Bit Allocation:
Command
Status_CML
Status_other
Function
Hex Data
7F
1
Register
Code Byte
Function
Status_mfr_specific
80
1
7
6
5
4
3
2
1
Busy
DC_ OFF
Status_fan_1_2
Read_Vin
Read_Vout
81
88
8B
8C
8D
90
91
1
2
2
2
2
2
2
Output OV Fault detected
Output OC Fault detected
Input UV Fault detected
Temp Fault/warning detected
CML (communication fault)
detected
Read input voltage
Read output voltage
Read output current
Read Temperature
In RPM
Status_Byte
78
Read_Iout
Read_temperature
Read_fan_speed_1
Read_fan_speed_2
In RPM
0
7
6
5
4
None of Below
Read_Pout
Read_Pin
96
97
98
99
9A
9B
9C
2
2
OV Fault/Warning detected
OC Fault/Warning detected
Input Fault/Warning detected
Mfr_specific register change
detected
PMBus revision
Mfr_ID
1
Status_word
(includes
Status_byte)
5
FRU_ID
79
Mfr_model
Mfr_revision
Mfr_location
15
4
3
2
1
0
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
DC_OFF
Fan Fault or Warning detected
Other fault
4
Mfr_date
Mfr_serial
Mfr_Vin_min
Mfr_Vin_max
Mfr_Iin_max
Mfr_Pin_max
Mfr_Vout_min
Mfr_Vout_max
Mfr_Iout_max
Mfr_Pout_max
Mfr_Tambient_max
Mfr_Tambient_min
User_data_00
9D
9E
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
B0
6
15
2
2
2
2
2
2
2
2
2
2
48
Unknown
Vout OV Fault
Vout OV Warning
Vout UV Warning
Vout UV Fault
36V (linear format)
75V (linear format)
27A (linear format)
950W (linear format)
10V (linear format)
15V (linear format)
71A (linear format)
850W (linear format)
70C (linear format)
-10C (linear format)
User memory space
Status_Vout
Status_Iout
Status_input
7A
7B
7C
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
User memory space
User_data_01
FRW_revision
Ilimit_control_I2C
Vout_control_ I2C
Fan_duty_cycle
Fan_speed
B1
D0
D3
D4
D6
D7
D8
E0
E1
E2
E3
E4
E5
E6
E7
E9
EA
ED
EE
EF
48
1
2
2
1
1
2
2
2
2
2
2
2
2
2
2
2
2
2
2
Ilimit set (1/100A)
Vout set (1/512V)
Duty_cycle in %
Vin OV Warning
Vin UV Warning
Control in duty cycle
Vin UV Fault
N/A
N/A
N/A
N/A
OT Fault
Vprog_ext
Read_Vout_ I2C
Read_Iout_ I2C
Read_TS_ I2C
CMD_OFF_ I2C
OTF_limit_ I2C
OTF_recovery_ I2C
DCOKHI_ I2C
1/512V
1/100A
Heat sink temp C
01-OFF, 00-ON
OT fault limit C
OT fault recovery C
High OV fault (1/512V)
Low OV fault (1/512V)
RPM
OT Warning
N/A
N/A
N/A
N/A
N/A
N /A
Status_temperature 7D
DCOKLO_ I2C
Fan1_speed_ I2C
Fan2_speed_ I2C
Read_Vin_ I2C
Read_Iin_ I2C
Read_Pin_ I2C
RPM
Status_cml
7E
Invalid/Unsupported Command
Invalid/Unsupported Data
Packet Error Check Failed
Memory Fault Detected
Processor Fault Detected
Reserved
Vin (1/100V)
Iin (1/100A)
Other Communications Fault
Other Memory or Logic Fault
April 23, 2013
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Page 12
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