STPM098C datasheet(95/110 Pages) STMICROELECTRONICS

95 / 110 page

Input voltage at SM_ADDR pin is encoded according to the following table:

Table 77. Target Address versus SM_ADD voltage

SM_ADDR

PMBus™ address [bin]

PMBus™ address [dec]

0.4739 ±40 mV

1011000

0.9017 ±70 mV

1011001

1.3123 ±100 mV

1011010

1.6611 ±130 mV

1011011

2.2883 ±170 mV

1011100

3.1153 ±220 mV

1011101

3.7523 ±250 mV

1011110

4.4464 ±280 mV

1011111

Note:

SM_ADDR voltage ranges are not overlapping. Should the pin voltage fall between two adjacent ranges, the

address the device is going to use cannot be predicted nor guaranteed in advance; however, once determined, it

will not be changing until the next device power cycle, as expected.

Supported protocols

To access STPM098C’s configuration and monitoring units, the PMBus™ interface supports the following list of

command protocols:

•

Send byte with PEC

•

Read byte with PEC

•

Write byte with PEC

•

Read word with PEC

•

Write word with PEC

•

Read 32 with PEC

•

Write 32 with PEC

3.16

Functional safety

3.16.1

Safe state

To reach the safety requirements of the system, the following safe state is supported by STPM098C:

SAFE-HIZ

When SAFE-HIZ is active the controller unit is disabled by forcing the PWM outputs in a tristate mode so that

PWMn = HIZ [n = 1, 2, 3, 4, 5, 6, 7, 8].

SAFE-HIZ is activated by default if the following conditions are verified:

•

Latched fault detection

•

Configurable fault with related FRC set to 1

STPM098C

Functional description

DS14440 - Rev 1

page 95/110

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