STM32L082KB datasheet(101/132 Pages) STMICROELECTRONICS

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DS10688 Rev 7

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STM32L082xx

Electrical characteristics

109

6.3.19

Timer characteristics

TIM timer characteristics

The parameters given in the Table 69 are guaranteed by design.

Refer to Section 6.3.13: I/O port characteristics for details on the input/output alternate

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

6.3.20

Communications interfaces

I2C interface characteristics

The I2C interface meets the timings requirements of the I2C-bus specification and user

manual rev. 03 for:

•

Standard-mode (Sm) : with a bit rate up to 100 kbit/s

•

Fast-mode (Fm) : with a bit rate up to 400 kbit/s

•

Fast-mode Plus (Fm+) : with a bit rate up to 1 Mbit/s.

The I2C timing requirements are guaranteed by design when the I2C peripheral is properly

configured (refer to the reference manual for details). The SDA and SCL I/O requirements

are met with the following restrictions: the SDA and SCL I/O pins are not "true" open-drain.

When configured as open-drain, the PMOS connected between the I/O pin and VDDIOx is

disabled, but is still present. Only FTf I/O pins support Fm+ low level output current

maximum requirement (refer to Section 6.3.13: I/O port characteristics for the I2C I/Os

characteristics).

All I2C SDA and SCL I/Os embed an analog filter (see Table 70 for the analog filter

characteristics).

Table 69. TIMx characteristics(1)

Symbol

Parameter

Conditions

Min

Max

Unit

tres(TIM)

Timer resolution time

tTIMxCLK

fTIMxCLK = 32 MHz 31.25

fEXT

Timer external clock frequency on CH1

to CH4

0fTIMxCLK/2

MHz

fTIMxCLK = 32 MHz

MHz

ResTIM

Timer resolution

bit

tCOUNTER

16-bit counter clock period when

internal clock is selected (timer’s

prescaler disabled)

65536

tTIMxCLK

fTIMxCLK = 32 MHz 0.0312

2048

µs

tMAX_COUNT Maximum possible count

65536 × 65536

tTIMxCLK

fTIMxCLK = 32 MHz

134.2

1. TIMx is used as a general term to refer to the TIM2, TIM6, TIM21, and TIM22 timers.

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