Car1212dc series dc-dc converter, Data sheet, Input: -36v – GE Industrial Solutions CAR1212DC series User Manual
Page 11: Output: 12v, Or 5 v, Pmbus, Command set
GE
Data Sheet
CAR1212DC series DC-DC converter
Input: -36V
D C
to -75V
DC
; Output: 12V
DC
@ 1200W; 3.3V
DC
or 5 V
DC
@ 1A
October 21, 2013
©2013 General Electric Company. All rights reserved.
Page 11
Standard READ:
Up to two bytes of data may follow a READ
request depending on the required data content. Analog data is
always transmitted as LSB followed by MSB. PEC is optional and
includes the address and data fields.
1
7
1
1
8
1
S
Slave address
Wr
A Command Code
A
1
7
1
1
8
1
Sr Slave Address
Rd
A
LSB
A
8
1
8
1
1
MSB
A
PEC
No-ack
P
Block instruction:
When writing or reading more than two bytes of
data at a time BLOCK instructions for WRITE and READ commands
must be used instead of the Standard Instructions.
Block write format:
1
7
1
1
8
1
S
Slave address
Wr
A
Command Code
A
8
1
8
1
8
1
Byte count = N A Data 1 A Data 2 A
8
1
8
1
8
1
1
……….
A
Data 48
A
PEC
A
P
Block read format:
1
7
1
1
8
1
S
Slave address
Wr
A
Command Code
A
1
7
1
1
Sr
Slave Address
Rd A
8
1
8
1
8
1
Byte count = N A Data 1 A Data 2 A
8
1
8
1
8
1
1
……….
A Data 48 A
PEC
NoAck P
Linear Data Format
The definition is identical to Part II of the
PMBus Specification. All standard PMBus values, with the exception
of output voltage related functions, are represented by the linear
format described below. Output voltage functions are represented
by a 16 bit mantissa. Output voltage has a E=9 constant exponent.
The Linear Data Format is a two byte value with an 11-bit, two’s
complement mantissa and a 5-bit, two’s complement exponent or
scaling factor, its format is shown below.
Data Byte High
Data Byte Low
Bit 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
Exponent (E)
Mantissa (M)
The relationship between the Mantissa, Exponent, and Actual Value
(V) is given by the following equation:
E
M
V
2
∗
=
Where:
V is the value
M is the 11-bit, two’s complement mantissa
E
is the 5-bit, two’s complement exponent
PMBus
TM
Command set:
Command
Hex
Code
Data
Byte
Write
Function
Operation
01
1
W Output ON/OFF
ON_OFF_config
02
1
Clear_faults
03
0
Clear Status
Write_protect
10
1
W Write control
Store_default_all
11
0
W Store permanently
Restore_default_all
12
0
Reset defaults
Vout_mode
20
1
Vout constants
Vout_command
21
2
W Set Vout
Fan_config_1_2
3A
1
W RPM or duty cycle
Fan_command_1
3B
2
W Set fan speed
Vout_OV_fault_limit
40
2
W Set OV fault limit
Vout_OV_fault_response
41
1
Latch only
Vout_OV_warn_limit
42
2
W Set OV warn limit
Iout_OC_fault_response
47
1
W Latch, restart,
folddown
Iout_OC_warn_limit
4A
2
W Set OC warn limit
OT_fault_limit
4F
2
W Set OT fault limit
OT_fault_response
50
1
W Latch, restart
OT_warn_limit
51
2
W Set OT warn limit
Status_byte
78
1
Status_word
79
2
Status_Vout
7A
1
Status_Iout
7B
1
Status_input
7C
1
Status_temperature
7D
1
Status_CML
7E
1
Status_mfr_specific
80
1
Status_fan_1_2
81
1
Read_Vout
8B
2
Read Vout
Read_Iout
8C
2
Read Iout
Read_temperature_1
8D
2
Read Temperature
PMBus revision
98
1
Read fan_speed
90
2
Read speed in RPM
Mfr_ID
99
5
FRU_ID
Mfr_model
9A
16
Mfr_revision
9B
4
Mfr_location
9C
4
Mfr_date
9D
6
Mfr_serial
9E
15
Mfr_Vin_min
A0
2
36V (linear format)
Mfr_Vin_max
A1
2
75V (linear format)
Mfr_Iin_max
A2
2
40A (linear format)
Mfr_Pin_max
A3
2
1400W (linear format)
Mfr_Vout_min
A4
2
10V (linear format)
Mfr_Vout_max
A5
2
15V (linear format)
Mfr_Iout_max
A6
2
100A (linear format)
Mfr_Pout_max
A7
2
1200W (linear format)
Mfr_Tambient_max
A8
2
70C (linear format)
Mfr_Tambient_min
A9
2
-10C (linear format)
FRW_revision
D0
1
Fan_duty_cycle_ I
2
C
D6
1
Duty_cycle read in %
OTF_RECOVERY_I
2
C
E5
2
Recovery
hysteresis °C
DCOKHI_ I
2
C
E6
2
(1/512V)
DCOKLO_ I
2
C
E7
2
(1/512V)