Datasheet
CMD Command Name
SMBus
Transaction
Type:
Writing
Data
SMBus
Transaction
Type:
Reading
Data
Number
of Data
Bytes
Default Value
Lower
Limit
Upper
Limit
Cross check
Unit
01h OPERATION
2
Write Byte Read Byte 1 0x80
02h ON_OFF_CONFIG
3
Write Byte Read Byte 1 0x1D
03h CLEAR_FAULTS Send byte N/A 0 N/A
10h WRITE_PROTECT Write Byte Read Byte 1 0x00
11h STORE_DEFAULT_ALL
4
Send byte N/A 0 N/A
12h RESTORE_DEFAULT_ALL
4
Send byte N/A 0 N/A
15h STORE_USER_ALL
4
Send byte N/A 0 N/A
16h RESTORE_USER_ALL
4
Send byte N/A 0 N/A
19h CAPABILITY N/A Read Byte 1 0xB0
20h VOUT_MODE N/A Read Byte 1 0x17
21h VOUT_COMMAND Write Word Read Word 2 12.000 8.100 13.200 V
22h VOUT_TRIM Write Word Read Word 2 0 8.1<=Vout<=13.2
15
V
25h VOUT_MARGIN_HIGH Write Word Read Word 2 13.199 8.100 13.199 >VOUT_MARGIN_LOW V
26h VOUT_MARGIN_LOW Write Word Read Word 2 8.100 8.100 13.200 <VOUT_MARGIN_HIGH V
28h VOUT_DROOP Write Word
12
Read Word 2 0/12
13
0 100 Vout>=8.100 m
40h VOUT_OV_FAULT_LIMIT Write Word Read Word 2 14.199 8.100 15.600 >VOUT_OV_WARN_LIMIT V
41h VOUT_OV_FAULT_RESPONSE
5
Write Byte Read Byte 1 0xB8
42h VOUT_OV_WARN_LIMIT Write Word Read Word 2 13.500 8.100 15.600
<VOUT_OV_FAULT_LIMIT
>VOUT_COMMAND
V
46h IOUT_OC_FAULT_LIMIT Write Word Read Word 2 59.00 0.00 65.00 >IOUT_OC_WARN_LIMIT A
47h IOUT_OC_FAULT_RESPONSE
6
Write Byte Read Byte 1 0xF8
4Ah IOUT_OC_WARN_LIMIT Write Word Read Word 2 56.00 0.00 65.00 <IOUT_OC_FAULT_LIMIT A
4Fh OT_FAULT_LIMIT Write Word Read Word 2 135 30 145 >OT_WARN_LIMIT °C
50h OT_FAULT_RESPONSE
5
Write Byte Read Byte 1 0xB8
51h OT_WARN_LIMIT Write Word Read Word 2 115 30 145 <OT_FAULT_LIMIT °C
55h VIN_OV_FAULT_LIMIT Write Word Read Word 2 66.50 32.00 110.00 >VIN_OV_WARN_LIMIT V
56h VIN_OV_FAULT_RESPONSE
7
Write Byte Read Byte 1 0xF8
57h VIN_OV_WARN_LIMIT Write Word Read Word 2 64.50 32.00 110.00
<VIN_OV_FAULT_LIMIT
>VIN_UV_WARN_LIMIT
V
58h VIN_UV_WARN_LIMIT Write Word Read Word 2 42.00 32.00 75.00
<VIN_OV_WARN_LIMIT
>VIN_UV_FAULT_LIMIT
V
59h VIN_UV_FAULT_LIMIT Write Word Read Word 2 40.00 32.00 75.00 <VIN_UV_WARN_LIMIT V
5Ah VIN_UV_FAULT_RESPONSE
7
Write Byte Read Byte 1 0xF8
DRQ-12/50-L48 Series
600W Digital Fully Regulated
Intermediate DC-DC Bus Converter
MDC_DRQ-12/50-L48NK.B02 Page 17 of 26
www.murata-ps.com/support
PMBus Addressing
Figure 2 and the accompanying table display the recommended resistor values
for hard-wiring PMBus addresses (1% tolerance resistors recommended): The
address is set in the form of two octal (0 to 7) digits, with each pin setting one
digit. The resistor values for each digit is shown below.
The SA0 and SA1 pins can be confi gured with a resistor to GND according to
the following equation.
PMBus Address = 8 x (SA0value) + (SA1 value)
If the calculated PMBus address is 0d, 11d or 12d, PMBus address 119d is
assigned instead. From a system point of view, the user shall also be aware of
further limitations of the addresses as stated in the PMBus Specifi cation. It is
not recommended to keep the SA0 and SA1 pins left open.
PMBus Commands
The products are designed to be PMBus compliant. The following tables list
the implemented PMBus read commands. For more detailed information see
“PMBus Power System Management Protocol Specifi cation, Part I – General
Requirements, Transport and Electrical Interface” and “PMBus Power System
Management Protocol, Part II – Command Language.”
Figure 2. Schematic of Connection of Address Resistors
SA0
SA1
R
1
R
0
Digit (SA0, SA1 index) Resistor Value [kΩ]
010
122
233
347
468
5 100
6 150
7 220
OVERALL