STM32F358XC datasheet(91/134 Pages) STMICROELECTRONICS

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STM32F358xC

Electrical characteristics

118

6.3.17

Communications interfaces

I2C interface characteristics

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

the following restrictions: the I/O pins SDA and SCL are mapped to are not “true” open-

drain. When configured as open-drain, the PMOS connected between the I/O pin and VDD is

disabled, but is still present.

The I2C characteristics are described in Table 60. Refer also to Section 6.3.13: I/O port

characteristics for more details on the input/output alternate function characteristics (SDA

and SCL).

Table 60. I2C timings specification (see I2C specification, rev.03, June 2007)(1)

Symbol

Parameter

Standard mode

Fast mode

Fast Mode Plus

Unit

Min

Max

Min

Max

Min

Max

fSCL

SCL clock frequency

100

400

1000

KHz

tLOW

Low period of the SCL clock

4.7

1.3

0.5

µs

tHIGH

High Period of the SCL clock

0.6

0.26

µs

Rise time of both SDA and SCL

signals

1000

300

120

Fall time of both SDA and SCL

signals

300

120

tHD;DAT

Data hold time

µs

tVD;DAT

Data valid time

3.45(2)

-0.9(2)

-0.45(2)

µs

tVD;ACK

Data valid acknowledge time

3.45(2)

-0.9(2)

-0.45(2)

µs

tSU;DAT

Data setup time

250

100

tHD:STA

Hold time (repeated) START

condition

4.0

0.6

0.26

µs

tSU:STA

Set-up time for a repeated START

condition

4.7

0.6

0.26

µs

tSU:STO

Set-up time for STOP condition

4.0

0.6

0.26

µs

tBUF

Bus free time between a

STOP and START condition

4.7

1.3

0.5

µs

Capacitive load for each bus line

400

550

1. The I2C characteristics are the requirements from I2C bus specification rev03. They are guaranteed by design when

I2Cx_TIMING register is correctly programmed (Refer to the reference manual). These characteristics are not tested in

production.

2. The maximum tHD;DAT could be 3.45 µs, 0.9 µs and 0.45 µs for standard mode, fast mode and fast mode plus, but must

be less than the maximum of tVD;DAT or tVD;ACK by a transition time.

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