STM32F107VB datasheet(58/95 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32F105xx, STM32F107xx

58/95

Doc ID 15274 Rev 4

5.3.15

Communications interfaces

2C interface characteristics

Unless otherwise specified, the parameters given in Table 40 are derived from tests

performed under the ambient temperature, fPCLK1 frequency and VDD supply voltage

conditions summarized in Table 9.

The STM32F105xx and STM32F107xx I

2C interface meets the requirements of the

standard I

2C 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 I

2C characteristics are described in Table 40. Refer also to Section 5.3.12: I/O port

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

and SCL).

Table 40.

I2C characteristics

Symbol

Parameter

Standard mode I2C(1)

1. Guaranteed by design, not tested in production.

Fast mode I2C(1)(2)

2. fPCLK1 must be higher than 2 MHz to achieve the maximum standard mode I

2C frequency. It must be

higher than 4 MHz to achieve the maximum fast mode I2C frequency.

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)

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)

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

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

tw(STO:STA)

Stop to Start condition time

(bus free)

4.7

1.3

Capacitive load for each bus

line

400

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