PIC16F946-ESLASHMLQTP datasheet(284/330 Pages) MICROCHIP

284 / 330 page

PIC16F913/914/916/917/946

DS41250F-page 282

TABLE 19-16: I2C™ BUS DATA REQUIREMENTS

Param.

No.

Symbol

Characteristic

Min.

Max.

Units

Conditions

100*

THIGH

Clock high time

400 kHz mode

0.6

—

μs

Device must operate at a

minimum of 10 MHz

SSP Module

1.5TCY

—

101*

TLOW

Clock low time

400 kHz mode

1.3

—

μs

Device must operate at a

minimum of 10 MHz

SSP Module

1.5TCY

—

102*

SDA and SCL rise

time

400 kHz mode

20 + 0.1CB

250

CB is specified to be from

10-400 pF

103*

SDA and SCL fall time 400 kHz mode

20 + 0.1CB

250

CB is specified to be from

10-400 pF

90*

TSU:STA

Start condition setup

time

400 kHz mode

1.3

—

μs

Only relevant for Repeated

Start condition

91*

THD:STA

Start condition hold

time

400 kHz mode

0.6

—

μs

After this period the first clock

pulse is generated

106*

THD:DAT

Data input hold time

400 kHz mode

0.9

μs

107*

TSU:DAT

Data input setup time 400 kHz mode

100

—

(Note 2)

92*

TSU:STO

Stop condition setup

time

400 kHz mode

0.6

—

μs

109*

TAA

Output valid from

clock

400 kHz mode

—

(Note 1)

110*

TBUF

Bus free time

400 kHz mode

1.3

—

μs

Time the bus must be free

before a new transmission

can start

Bus capacitive loading

—

400

These parameters are characterized but not tested.

Note 1:

As a transmitter, the device must provide this internal minimum delay time to bridge the undefined region (min. 300 ns)

of the falling edge of SCL to avoid unintended generation of Start or Stop conditions.

A Fast mode (400 kHz) I2C bus device can be used in a Standard mode (100 kHz) I2C bus system, but the requirement

TSU:DAT

≥ 250 ns must then be met. This will automatically be the case if the device does not stretch the low period of

the SCL signal. If such a device does stretch the low period of the SCL signal, it must output the next data bit to the SDA

line TR max. + TSU:DAT = 1000 + 250 = 1250 ns (according to the Standard mode I2C bus specification), before the SCL

line is released.

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