STM32F103CBT7XXX datasheet(65/96 Pages) STMICROELECTRONICS

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STM32F103x8, STM32F103xB

Electrical characteristics

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5.3.15

Communications interfaces

2C interface characteristics

Unless otherwise specified, the parameters given in Table 39 are derived from tests

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

conditions summarized in Table 9.

The STM32F103xx performance line I

2C interface meets the requirements of the standard

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 39. 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 39.

I2C characteristics

Symbol

Parameter

Standard mode I2C(1)

Guaranteed by design, not tested in production.

Fast mode I2C(1)(2)

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

2C frequencies. It must be higher than

4 MHz to achieve fast mode I2C frequencies. It must be 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

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

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

s

tw(STO:STA)

Stop to Start condition time

(bus free)

4.7

1.3

s

Capacitive load for each bus

line

400

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