STM32F103RCT6 datasheet(96/143 Pages) STMICROELECTRONICS

96 / 143 page

Electrical characteristics

STM32F103xC, STM32F103xD, STM32F103xE

96/143

DS5792 Rev 13

5.3.17

Communications interfaces

I2C interface characteristics

The STM32F103xC, STM32F103xD and STM32F103xESTM32F103xF and STM32F103xG

performance line 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 51. Refer also to Section 5.3.14: I/O port

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

and SCL).

Table 51. I2C characteristics

Symbol

Parameter

Standard mode

I2C(1)(2)

1. Guaranteed by design.

Fast mode I2C(1)(2)

2. fPCLK1 must be at least 2 MHz to achieve standard mode I2C frequencies. It must be at least 4 MHz to

achieve the fast mode I2C frequencies and it must be a multiple of 10 MHz in order to reach the I2C fast

mode maximum clock speed of 400 kHz.

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

3450(3)

-900(3)

3. The device must internally provide a hold time of at least 300ns for the SDA signal in order to bridge the

undefined region on the falling edge of SCL.

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

tSP

Pulse width of the spikes

that are suppressed by the

analog filter for standard and

fast mode

050(4)

4. The minimum width of the spikes filtered by the analog filter is above tSP(max).

050(4)

μs

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