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SLDM-06D1Ax

tech.support@psbel.com

belpowersolutions.com

40. PMBUS ADDRESSING

The power module can be addressed through the PMBus using a device address. The module has 64 possible addresses (0 to 63 in decimal)

which can be set using resistors connected from the ADDR0 and ADDR1 pins to SIG_GND. Note that some of these addresses (0, 1, 2, 3, 4, 5,

6, 7, 8, 9, 10, 11 12, 40, 44, 45, 55 in decimal) are reserved according to the SMBus specifications and may not be useable. The address is set in

the form of two octal (0 to 7) digits, with each pin setting one digit. The ADDR1 pin sets the high order digit and ADDR0 sets the low order digit.

The resistor values suggested for each digit are shown in Table 4 (1% tolerance resistors are recommended).

Note that if either address resistor value is outside the range specified in Table 4, the module will respond to address 127.

Table 4

Digit

Resistor Value (KΩ)

0

10

1

15.4

2

23.7

3

36.5

4

54.9

5

84.5

6

130

7

200

with other system operations. Both 100kHz and 400kHz bus speeds are supported by the module. Connection for the PMBus interface should

follow the High Power DC specifications given in section 3.1.3 in the SMBus specification V2.0 for the 400kHz bus speed or the Low Power DC

specifications in section 3.1.2. The complete SMBus specification is available from the SMBus web site, smbus.org.

Figure 48

Circuit showing connection of resistors used to set the PMBus address of the module.

ADDR0

SIG_GND

ADDR1