Non-Volatile Memory (NVM)
The product incorporates two Non-Volatile Memory areas for
storage of the supported PMBus commands; the Default NVM
and the User NVM.
The Default NVM is pre-loaded with Flex factory default
values. The Default NVM is write-protected and can be used
to restore the Flex factory default values through the
command RESTORE_DEFAULT_ALL.
The User NVM is pre-loaded with Flex factory default values.
The User NVM is writable and open for customization. The
values in NVM are loaded into operational RAM during
initialization according to section “Initialization Procedure”,
where after commands can be changed through the PMBus
Interface. The STORE_USER_ALL command will store the
changed parameters to the User NVM.
Software tools for design and production
Flex provides software tools for configuration and monitoring
of this product via the PMBus interface.
For more information please contact your local Flex sales
representative.
PMBus addressing
The PMBus address should be configured with resistors
connected between the SA0/SA1 pins and the PREF pin, as
shown in the figure below. Recommended resistor values for
hard-wiring PMBus addresses are shown in the table. 1%
tolerance resistors are required.
Schematic of connection of address resistor.
Index
R
SA
[k
]
Index
R
SA
[k
]
0
10
13
34.8
1
11
14
38.3
2
12.1
15
42.2
3
13.3
16
46.4
4
14.7
17
51.1
5
16.2
18
56.2
6
17.8
19
61.9
7
19.6
20
68.1
8
21.5
21
75
9
23.7
22
82.5
10
26.1
23
90.9
11
28.7
24
100
12
31.6
The PMBus address follows the equation below:
Eq. 7. PMBus Address (decimal) = 25 x (SA1 index) +
(SA0 index)
The user can theoretically configure up to 625 unique PMBus
addresses, however the PMBus address range is inherently
limited to 128. Therefore, the user should use index values 0 -
4 on the SA1 pin and the full range of index values on the SA0
pin, which will provide 125 device address combinations. The
user shall also be aware of further limitations of the address
space as stated in the SMBus Specification.
Note that address 0x4B is allocated for production needs and
cannot be used.
User NVM
Flex factory default
Customizable
RAM
Default NVM
Flex factory default
Write-protected
RESTORE_DEFAULT_ALL
WRITE
READ
PMBus interface
STORE_USER_ALL
INITIALIZATION
INITIALIZATION
SA0
SA1
PREF
RSA1
RSA0
RESTORE_USER_ALL
BMR4
6
series
PoL Regulators
Input 4.5-14 V, Output up to 50 A / 165 W
1/28701-BMR 464 Rev.B
July 2019
© Flex
Technical Specification
BMR4
6
series
PoL Regulators
Input
4.5-14
V, Output up to
50
A
/
165
W
1/28701-BMR 464 Rev.B
July 2019
©
Flex
Technical Specification
67
