Inter-Integrated Circuit Interfaces (I 2 C); Table 6. Comparison Of I2C Analog And Digital Filters; Table 7. Stm32F031X4/X6 I C Implementation - STMicroelectronics STM32F031F4 Manual

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STM32F031x4 STM32F031x6
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
3.13 Inter-integrated circuit interfaces (I
2
The I C interface (I2C1) can operate in multimaster or slave modes. It can support Standard
mode (up to 100 kbit/s), Fast mode (up to 400 kbit/s) and Fast Mode Plus (up to 1 Mbit/s)
with 20 mA output drive.
It supports 7-bit and 10-bit addressing modes, multiple 7-bit slave addresses (two
addresses, one with configurable mask). It also includes programmable analog and digital
noise filters.
Pulse width of
suppressed spikes
Benefits
Drawbacks
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 interface can be served by the DMA controller.
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 with output drive I/Os (up to 1 Mbit/s)
Independent clock
SMBus
Wakeup from STOP
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Table 6. Comparison of I2C analog and digital filters

Analog filter
 50 ns
Available in Stop mode
Variations depending on
temperature, voltage, process
Table 7. STM32F031x4/x6 I
I2C features
DocID025743 Rev 3
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2
C)
Programmable length from 1 to 15
I2C peripheral clocks
1. Extra filtering capability vs.
standard requirements.
2. Stable length
Wakeup from Stop on address
match is not available when digital
filter is enabled.
2
C implementation
(1)
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Functional overview
Digital filter
I2C1
X
X
X
X
X
X
X
X
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