STM32L151VD datasheet(109/154 Pages) STMICROELECTRONICS

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STM32L151xD STM32L152xD

Electrical characteristics

129

6.3.17

Communications interfaces

I2C interface characteristics

The device I2C interface meets the requirements of the standard I2C communication

protocol with the following restrictions: SDA and SCL are not “true” open-drain I/O pins.

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 55. Refer also to Section 6.3.14: I/O port

characteristics for more details on the input/output ction characteristics (SDA and SCL).

Table 55. 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 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

3450(3)

-900(3)

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

signal.

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 spikes that

are suppressed by the

analog filter

050(4)

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

050(4)

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