PAC1933T-ISLASHJQ. datasheet(7/62 Pages) MICROCHIP

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DS20005850C-page 7

PAC1932/3/4

FIGURE 1-1:

SMBus Timing.

TABLE 1-2:

SMBUS MODULE SPECIFICATIONS

Electrical Characteristics

: Unless otherwise specified, maximum values are at TA = -40°C to +85°C,

VDD = 2.7V to 5.5V, VBUS = 0V to 32V; Typical values are at TA = +25°C, VDD = 3.3V, VBUS = 32V,

VSENSE = (SENSE+ – SENSE-) = 0V, VDD I/O = 1.62V to 5.5V

Characteristic

Sym.

Min.

Typ.

Max.

Units

Conditions

SMBus Interface

Input Capacitance

CIN

—

Not tested in production

SMBus Timing

Clock Frequency

fSMB

.010

—

MHz

No minimum if Time-Out is not

enabled.

Spike Suppression

tSP

—

Bus Free Time Stop to

Start

tBUF

0.5

—

µs

Per SMBus 3.0

Hold Time after

Repeated Start

Condition

tHD:STA

0.26

—

µs

Per SMBus 3.0

Repeated Start

Condition Setup Time

tSU:STA

0.26

—

µs

Per SMBus 3.0

Setup Time: Stop

tSU:STO

0.26

—

µs

Per SMBus 3.0

Setup Time: Start

tSU:STA

0.26

—

µs

Data Hold Time

tHD:DAT

0—

—

µs

Data Setup Time

tSU:DAT

—

Per SMBus 3.0 (Note)

Clock Low Period

tLOW

0.5

—

µs

Per SMBus 3.0

Clock High Period

tHIGH

0.26

—

µs

Clock/Data Fall Time

tFALL

—

120

Not tested in production

Clock/Data Rise Time

tRISE

—

120

Not tested in production

Capacitive Load

CLOAD

—

550

Per bus line,

CLOAD not tested in production

SLOW Pin Pulse Width

SLOWpw

—

100

—

µs

Pulses narrower than 100 µS

may not be detected

Note:

A device must internally provide a hold time of at least 300 ns for the SM_DATA signal (with respect to the

VIH(min) of the SM_CLK signal) to bridge the undefined region of the falling edge of SM_CLK.

SMDATA

SMCLK

TLOW

TRISE

THIGH

TFALL

TBUF

THD:STA

S - Start Condition

P - Stop Condition

THD:DAT

TSU:DA

TSU:STA

THD:STA

TSU:STO

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