PIC16F631 datasheet(253/294 Pages) MICROCHIP

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DS41262D-page 251

PIC16F631/677/685/687/689/690

TABLE 17-14: I2C™ BUS DATA REQUIREMENTS

Param.

No.

Symbol

Characteristic

Min

Max

Units

Conditions

100*

THIGH

Clock high time

100 kHz mode

4.0

—

μs

Device must operate at a

minimum of 1.5 MHz

400 kHz mode

0.6

—

μs

Device must operate at a

minimum of 10 MHz

SSP Module

1.5TCY

—

101*

TLOW

Clock low time

100 kHz mode

4.7

—

μs

Device must operate at a

minimum of 1.5 MHz

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

100 kHz mode

—

1000

400 kHz mode

20 + 0.1CB

300

CB is specified to be from

10-400 pF

103*

SDA and SCL fall

time

100 kHz mode

—

300

400 kHz mode

20 + 0.1CB

300

CB is specified to be from

10-400 pF

90*

TSU:STA

Start condition

setup time

100 kHz mode

4.7

—

μs

Only relevant for

Repeated Start condition

400 kHz mode

0.6

—

μs

91*

THD:STA

Start condition hold

time

100 kHz mode

4.0

—

μs

After this period the first

clock pulse is generated

400 kHz mode

0.6

—

μs

106*

THD:DAT

Data input hold time 100 kHz mode

—

400 kHz mode

0.9

μs

107*

TSU:DAT

Data input setup

time

100 kHz mode

250

—

(Note 2)

400 kHz mode

100

—

92*

TSU:STO

Stop condition

setup time

100 kHz mode

4.7

—

μs

400 kHz mode

0.6

—

μs

109*

TAA

Output valid from

clock

100 kHz mode

—

3500

(Note 1)

400 kHz mode

—

110*

TBUF

Bus free time

100 kHz mode

4.7

—

μs

Time the bus must be free

before a new transmission

can start

400 kHz mode

1.3

—

μs

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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