STM32F217VG datasheet(102/173 Pages) STMICROELECTRONICS

102 / 173 page

Electrical characteristics

STM32F21xxx

102/173

Doc ID 17050 Rev 8

Table 49.

I2C characteristics

Symbol

Parameter

Standard mode I2C(1)

Guaranteed by design, not tested in production.

Fast mode I2C(1)(2)

fPCLK1 must be at least 2 MHz to achieve standard mode I

2C frequencies. It must be at least 4 MHz to

achieve fast mode I2C frequencies, and a multiple of 10 MHz to reach the 400 kHz maximum I2C fast mode

clock.

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

900(3)

The maximum Data hold time has only to be met if the interface does not stretch the low period of the SCL

signal.

tr(SDA)

tr(SCL)

SDA and SCL rise time

1000

20 + 0.1Cb

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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