CD00237391 datasheet(102/177 Pages) STMICROELECTRONICS

102 / 177 page

Electrical characteristics

STM32F20xxx

102/177

Doc ID 15818 Rev 9

5.3.19

Communications interfaces

2C interface characteristics

Unless otherwise specified, the parameters given in Table 50 are derived from tests

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

conditions summarized in Table 12.

STM32F205xx and STM32F207xx I

2C 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 I

2C characteristics are described in Table 50. Refer also to Section 5.3.16: I/O port

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

and SCL).

Table 49.

Characteristics of TIMx connected to the APB2 domain(1)

TIMx is used as a general term to refer to the TIM1, TIM8, TIM9, TIM10, and TIM11 timers.

Symbol

Parameter

Conditions

Min

Max

Unit

tres(TIM)

Timer resolution time

AHB/APB2

prescaler distinct

from 1, fTIMxCLK =

120 MHz

tTIMxCLK

8.3

AHB/APB2

prescaler = 1,

fTIMxCLK = 60 MHz

tTIMxCLK

16.7

fEXT

Timer external clock

frequency on CH1 to CH4

fTIMxCLK = 120 MHz

APB2 = 60 MHz

fTIMxCLK/2

MHz

060

MHz

ResTIM

Timer resolution

bit

tCOUNTER

16-bit counter clock period

when internal clock is

selected

65536

tTIMxCLK

0.0083

546

µs

tMAX_COUNT Maximum possible count

65536 × 65536

tTIMxCLK

35.79

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