USB5532B datasheet(26/40 Pages) MICROCHIP

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2-Port SS/HS USB Hub Controller

Datasheet

Revision 1.2 (05-31-13)

SMSC USB5532B

DATASHEET

5.2.5

Bus Reset Sequence

The SMBus slave interface resets and returns to the idle state upon a START condition followed

immediately by a STOP condition.

5.2.6

SMBus Alert Response Address

The SMBALERT# signal is not supported by the USB5532B.

5.2.7

SMBus Timing

The SMBus slave interface complies with the SMBus Specification Revision 1.0. See Section 2.1, AC

Specifications on page 3 for more information.

Figure 5.14 SMBus Slave Timing Diagram

Table 5.2 SMBus Slave Timing Modes

SYMBOL

PARAMETER

MIN

MAX

UNIT

fSCL

SM_CLK clock frequency

100

KHz

tHD;STA

Hold time START condition

μs

tLOW

LOW period of the SM_CLK clock

4.7

μs

tHIGH

HIGH period of the SM_CLK clock

μs

tSU;STA

Set-up time for a repeated START condition

4.7

μs

tHD;DAT

DATA hold time\

tSU;DAT

DATA set-up time

250

Rise time of both SM_DATA and SM_CLK

signals

1000

Fall time of both SM_CLK and SM_DATA lines

300

tSU;STO

Set-up time for a STOP condition

μs

tBUF

Bus free time between a STOP and START

condition

4.7

μs

SM_DATA

SM_CLK

tBUF

tHD;STA

tSU;STO

tSU;STA

tSU;DAT

tHIGH

tHD;DAT

tHD;STA

tLOW

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