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STPM098C 数据表(PDF) 93 Page - STMicroelectronics |
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STPM098C 数据表(HTML) 93 Page - STMicroelectronics |
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93 / 110 page  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 10 - 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 0 - - ns - PMBus™_tsudat Data setup time 250 - - ns - PMBus™_timeout Detect clock low timeout 25 - 35 ms - PMBus™_tlow Clock low period 4.7 - - μs - PMBus™_thigh Clock high period 4.0 - 50 μs - PMBus™_tlowsext Cumulative clock low extend time (target device) - - 25 ms - PMBus™_tlowmext Cumulative clock low extend time (controller device) - - 10 ms - PMBus™_tf Clock/data fall time - - 300 ns - PMBus™_tr Clock/data rise time - - 1000 ns - Table 75. PMBus™ 400 kHz class AC characteristics Symbol Parameter Test condition Min Typ Max Unit Notes PMBus™_fpmb PMBus™ operating frequency 10 - 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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