Ericsson Internal
PRODUCT SPECIFICATION
1 (4)
Prepared (also subject responsible if other)
No.
EANDKUL
31/1301-BMR 453
Approved
Checked
Date
Rev
Reference
EAB/FJB/GMF (Natalie Johannson)
(MICJMAL)
2009-01-20
B
PMBus Communications
The BMR 453 DC/DC converters provide a PMBus digital
interface that enables the user to configure many aspects of
the device operation as well as monitor the input and output
parameters. The products can be used with any standard 2-
wire I
2C 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.
Monitoring via PMBus
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:
Input voltage
Output voltage
Output current
Internal junction temperature
Switching frequency
Duty cycle
Evaluation software
For the DC/DC converter Ericsson provides an evaluation
software, CMM.
For more information please contact your local
Ericsson sales representative.
Addressing
The figure and table below show recommended resistor
values with min and max voltage range for hard-wiring PMBus
addresses (series E96, 1% tolerance resistors suggested):
SA0/SA1
Id
R1 /R0 [kΩ]
Min voltage[V]
Max voltage[V]
0
24.9
0.261
0.438
1
49.9
0.524
0.679
2
75
0.749
0.871
3
100
0.926
1.024
4
124
1.065
1.146
5
150
1.187
1.256
6
174
1.285
1.345
7
200
1.371
1.428
The SA0 and SA1 pins can be configured with a resistor to
GND according to the following equation.
PMBus Address = 8 x (SA0value) + (SA1 value)
If any one of those voltage applied to ADC0 and ADC1 is out
of the range from the table above, PMBus address 127 is
assigned. If the calculated PMBus address is 0 or 12, PMBus
address 127 is assigned instead. PMBus address 11 is not to
be used. The user shall also be aware of further limitations of
the addresses as stated in the PMBus Specification.
E
BMR 453
DC/DC Converters, Input 36-75V, Output 33A/400 W
EN/LZT 146 395 R1C February 2009
Ericsson AB
Technical Specication
16