STM32F372CB datasheet(24/128 Pages) STMICROELECTRONICS

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Functional overview

STM32F37x

24/128

Doc ID 022691 Rev 3

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

3.19

Inter-integrated circuit interface (I2C)

Up to two I2C bus interfaces can operate in multimaster and slave modes. They can support

standard (up to 100 kHz), fast (up to 400 kHz) and fast mode + (up to 1 MHz) modes with

20 mA output drive. They support 7-bit and 10-bit addressing modes, multiple 7-bit slave

addresses (2 addresses, 1 with configurable mask). They also include programmable

analog and digital noise filters.

In addition, they provide hardware support for SMBUS 2.0 and PMBUS 1.1: ARP capability,

Host notify protocol, hardware CRC (PEC) generation/verification, timeout verifications and

ALERT protocol management. They also have a clock domain independent from the CPU

clock, allowing the application to wake up the MCU from Stop mode on address match.

The I2C interfaces can be served by the DMA controller

Refer to Table 7 for the differences between I2C1 and I2C2.

Table 6.

Comparison of I2C analog and digital filters

Analog filter

Digital filter

Pulse width of

suppressed spikes

 50 ns

Programmable length from 1 to 15

I2C peripheral clocks

Benefits

Available in Stop mode

1. Extra filtering capability vs.

standard requirements.

2. Stable length

Drawbacks

Variations depending on

temperature, voltage, process

Wakeup from Stop on address

match is not available when digital

filter is enabled

Table 7.

STM32F37x I2C implementation

I2C features(1)

X = supported.

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 with 20mA output drive I/Os (up to 1 Mbit/s)

Independent clock

SMBus

Wakeup from STOP

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