STPM098C datasheet(93/110 Pages) STMICROELECTRONICS

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3.15

Power system management bus interface (PMBus™)

STPM098C implements a standard 2-pin PMBus™ interface to access both IC configuration and status registers

up to 400 kHz baud rate (up/down-stream).

3.15.1

Protocol description

3.15.1.1

Physical layer

Figure 79. PMBus™ AC characteristics timing diagram

SM_CLK

SM_DATA

Table 74. PMBus™ 100 kHz class AC characteristics

Symbol

Parameter

Test

condition

Min Typ Max Unit

Notes

PMBus™_fpmb

PMBus™ operating frequency

100

kHz -

PMBus™_tbuf

Bus free time between STOP and START

condition

4.7

μs

Hold time after (REPEATED) START

condition

4.0

μs

After this period the

first clock is

generated

PMBus™_tsusta

REPEATED START condition setup time

4.7

μs

PMBus™_tsusto

STOP condition setup time

4.0

μs

PMBus™_thddat

Data hold time

PMBus™_tsudat

Data setup time

250

PMBus™_timeout

Detect clock low timeout

ms -

PMBus™_tlow

Clock low period

4.7

μs

PMBus™_thigh

Clock high period

4.0

μs

PMBus™_tlowsext

Cumulative clock low extend time (target

device)

ms -

PMBus™_tlowmext

Cumulative clock low extend time (controller

device)

ms -

PMBus™_tf

Clock/data fall time

300

PMBus™_tr

Clock/data rise time

1000

Table 75. PMBus™ 400 kHz class AC characteristics

Symbol

Parameter

Test

condition

Min Typ Max Unit

Notes

PMBus™_fpmb

PMBus™ operating frequency

400 kHz -

PMBus™_tbuf

Bus free time between STOP and START

condition

1.3

μs

STPM098C

Functional description

DS14440 - Rev 1

page 93/110

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