ST7263BEx datasheet(160/186 Pages) STMICROELECTRONICS

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Electrical characteristics

ST7263Bxx

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13.10.3

I2C interface

Refer to I/O port characteristics for more details on the input/output alternate function

characteristics (SDAI and SCLI).

The ST7 I2C interface meets the requirements of the standard I2C communication protocol

described in the following table.

Subject to general operating conditions for VDD, fOSC, and TA unless otherwise specified.

Table 76.

I2C characteristics

Symbol

Parameter

Standard mode

I2C(1)

Data based on standard I2C protocol requirement, not tested in production.

Fast mode I2C(1)(2)

At 4 MHz fCPU, max.I

2C speed (400 kHz) is not achievable. In this case, max. I2C speed will be

approximately 260 KHz.

Unit

Min

Max

Min

Max

tw(SCLL) SCL clock low time

4.7

1.3

µs

tw(SCLH) SCL clock high time

4.0

0.6

tsu(SDA) SDA setup time

250

100

th(SDA)

SDA data hold time

0(3)

The maximum hold time of the START condition has only to be met if the interface does not stretch the low

period of SCL signal.

-0(4)

The device must internally provide a hold time of at least 300ns for the SDA signal in order to bridge the

undefined region of the falling edge of SCL.

900(3)

tr(SDA)

tr(SCL)

SDA and SCL rise time

1000

20+0.1Cb

300

tf(SDA)

tf(SCL)

SDA and SCL fall time

300

20+0.1Cb

300

th(STA)

START condition hold time

4.0

0.6

µs

tsu(STA) Repeated START condition setup time

4.7

0.6

tsu(STO) STOP condition setup time

4.0

0.6

µs

tw(STO:S

TA)

STOP to START condition time (bus free)

4.7

1.3

µs

Capacitive load for each bus line

400

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