STM8L151X6 datasheet(107/146 Pages) STMICROELECTRONICS

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DocID17943 Rev 10

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STM8L151x6/8 STM8L152x6/8

Electrical parameters

123

I2C - Inter IC control interface

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

The STM8L I2C interface (I2C1) meets the requirements of the Standard I2C communication

protocol described in the following table with the restriction mentioned below:

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

characteristics (SDA and SCL).

Note:

For speeds around 200 kHz, the achieved speed can have a

± 5% tolerance.

For other speed ranges, the achieved speed can have a

± 2% tolerance.

The above variations depend on the accuracy of the external components used.

Table 44. I2C characteristics

Symbol

Parameter

Standard mode I2C

Fast mode I2C(1)

1. fSYSCLK must be at least equal to 8 MHz to achieve max fast I2C speed (400 kHz).

Unit

Min.(2)

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

Max. (2)

Min. (2)

Max. (2)

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

900

tr(SDA)

tr(SCL)

SDA and SCL rise time

1000

300

tf(SDA)

tf(SCL)

SDA and SCL fall time

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:STA)

STOP to START condition time (bus

free)

4.7

1.3

μs

Capacitive load for each bus line

400

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