STM32F102XB datasheet(56/76 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32F102x8, STM32F102xB

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Doc ID 15056 Rev 4

5.3.15

TIM timer characteristics

The parameters given in Table 38 are guaranteed by design.

Refer to Section 5.3.13: I/O port characteristics for details on the input/output alternate

function characteristics (output compare, input capture, external clock, PWM output).

5.3.16

Communications interfaces

I2C interface characteristics

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

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

summarized in Table 8.

The STM32F102xx medium-density USB access 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 39. Refer also to Section 5.3.13: I/O port

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

and SCL).

Table 38.

TIMx(1) characteristics

TIMx is used as a general term to refer to the TIM2, TIM3 and TIM4 timers.

Symbol

Parameter

Conditions

Min

Max

Unit

tres(TIM)

Timer resolution time

tTIMxCLK

fTIMxCLK = 48 MHz

20.84

fEXT

Timer external clock

frequency on CH1 to CH4

fTIMxCLK/2

MHz

fTIMxCLK = 48 MHz

024

MHz

ResTIM

Timer resolution

bit

tCOUNTER

16-bit counter clock period

when internal clock is

selected

65536

tTIMxCLK

fTIMxCLK = 48 MHz 0.0208

1365

µs

tMAX_COUNT Maximum possible count

65536 × 65536

tTIMxCLK

fTIMxCLK = 48 MHz

89.48

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