STM32F058C8 datasheet(23/104 Pages) STMICROELECTRONICS

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STM32F058C8 STM32F058R8 STM32F058T8

Functional overview

The RTC clock sources can be:

•

a 32.768 kHz external crystal

•

a resonator or oscillator

•

the internal low-power RC oscillator (typical frequency of 40 kHz)

•

the high-speed external clock divided by 32

3.16

Inter-integrated circuit interface (I2C)

Up to two I2C interfaces (I2C1 and I2C2) can operate in multimaster or slave modes. Both

can support Standard mode (up to 100 kbit/s) and Fast mode (up to 400 kbit/s) and, I2C1

also supports Fast Mode Plus (up to 1 Mbit/s) with extra output drive.

Both support 7-bit and 10-bit addressing modes, multiple 7-bit slave addresses (two

addresses, one with configurable mask). They also include programmable analog and

digital noise filters.

In addition, I2C1 provides hardware support for SMBUS 2.0 and PMBUS 1.1: ARP

capability, Host notify protocol, hardware CRC (PEC) generation/verification, timeouts

verifications and ALERT protocol management. I2C1 also has a clock domain independent

from the CPU clock, allowing the I2C1 to wake up the MCU from Stop mode on address

match.

The I2C peripherals can be served by the DMA controller.

Refer to Table 8 for the differences between I2C1 and I2C2.

Table 7. Comparison of I2C analog and digital filters

Aspect

Analog filter

Digital filter

Pulse width of

suppressed spikes

≥ 50 ns

Programmable length from 1 to 15

I2Cx peripheral clocks

Benefits

Available in Stop mode

–Extra filtering capability vs.

standard requirements

–Stable length

Drawbacks

Variations depending on

temperature, voltage, process

Wakeup from Stop on address

match is not available when digital

filter is enabled.

Table 8. STM32F058C8/R8/T8 I2C implementation

I2C features(1)

I2C1

I2C2

7-bit addressing mode

10-bit addressing mode

Standard mode (up to 100 kbit/s)

Fast mode (up to 400 kbit/s)

Fast Mode Plus (up to 1 Mbit/s) with extra output drive I/Os

Independent clock

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