Ericsson Internal
E
EGUHAIL
PRODUCT SPECIFICATION
1 (4)
Prepared (also subject responsible if other)
No.
31/1301-BMR 451 00/02 Uen
18
Technical Specification
Approved
Checked
Date
Rev
Reference
EN/LZT 146 401 R4A May 2015
BMR 451 Digital PoL Regulators
Input 4.5-14 V, Output up to 40 A / 132 W
SEC/D (Julia You)
EZIWSON
2011-12-20
D
© Ericsson AB
PMBus Interface
SA0/SA1 Index
SA0/SA1 Index
RSA0/RSA1 [kΩ]
RSA0/RSA1 [kΩ]
The regulator provides a digital PMBus interface that enables
the user to monitor the input and output parameters. The
PMBus interface can also be used for configuration of the
regulator. The products can be used with any standard 2-wire
I2C or SMBus host device. In addition, the device is compatible
with PMBus version 1.1 and includes an SALERT line to help
mitigate bandwidth limitations related to continuous fault
monitoring. The PMBus signals, SCL, SDA, SALERT requires
passive pull-up resistors as stated in the SMBus Specification.
1
0
10
13
14
15
16
17
18
19
20
21
22
23
24
34.8
38.3
42.2
46.4
51.1
56.2
61.9
68.1
75
2
1
11
3
2
12.1
13.3
14.7
16.2
17.8
19.6
21.5
23.7
26.1
28.7
31.6
4
3
5
4
6
5
7
6
8
7
Monitoring via PMBus
9
8
A system controller can monitor a wide variety of different
parameters through the PMBus interface. The controller can
monitor for fault condition by monitoring the SALERT pin,
which will be asserted when any number of pre-configured
fault or warning conditions occur. The system controller can
also continuously monitor for any number of power conversion
parameters including but not limited to the following:
10
9
82.5
90.9
100
11
10
12
11
13
12
14
The PMBus address follows the equation below:
15
•
•
•
•
•
•
Input voltage
Output voltage
Output current
Internal junction temperature
Switching frequency
Duty cycle
16
PMBus Address = 25 x (SA1 index) + (SA0 index)
17
The user can theoretically configure up to 625 unique PMBus
18
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 124 device address combinations (The
address 0d75 is allocated for production needs and can not be
used.). The user shall also be aware of further limitations of the
address space as stated in the SMBus Specification(Note that
0-12, 40, 44, 45, 55, 64-68 in decimal are reserved and may
not be usable).
Software Tools for Design and Production
Ericsson provides software for configuration and monitoring of
this product via the PMBus interface.
For more information please contact your local
Ericsson sales representative.
PMBus Addressing
The PMBus address should be configured with resistors
connected between SA0 and SA1 pin to the –S pin, as shown
in the figure. Recommended resistor values for hard-wiring
PMBus addresses (series E96, 1% tolerance resistors
suggested) are shown in the table.
SA0
SA1
R
R
SA1
SA0
−S
Schematic of connection of address resistors.
ERICSSON [ ERICSSON ]
