DocID027335 Rev 2

11/19

AN4640

Peripherals interconnect matrix

18

2.2

Analog block

Analog block includes:

•

ADC block: three ADCs;

•

DAC block: two DAC converters;

•

Temperature sensor Block.

2.2.1

From ADC to ADC

In multi ADC mode, the start of conversion is triggered alternately or simultaneously by the

ADC1 master to the ADC2 and ADC3 slaves, depending on the mode selected by the

MULTI[4:0] bits in the ADC_CCR register.

This feature is explained in the “Multi ADC mode” section of RM0390 and RM0090

reference manuals.

2.2.2

From Temperature sensor to ADC1

On STM32F4xx devices, the temperature sensor is internally connected to the input

channel, either ADC1_IN16 or ADC1_IN18 can be used to convert the sensor output

voltage into a digital value.

The section “Temperature sensor” in the RM0390 and RM0090 reference manuals

describes the connection between the sensor and the ADC and the procedure to apply in

order to read the converted value.

2.2.3

From Analog block to DMA

Refer to Section 2.6: DMA block.

2.3

Clocks block

System block includes:

•

LSE clock;

•

LSI clock;

•

Clock security system (CSS);

•

Real-time clock (RTC).

2.3.1

From CSS to TIM

CSS can generate system errors in the form of timer break toward timers.

The purpose of the break function is to protect power switches driven by PWM signals

generated by the timers.

The list of possible break sources is given in the “Using the break function (TIM1/TIM8)”

section of the RM0090 and RM0390 reference manuals.

2.3.2

From LSE, LSI, RTC to TIM

External clock (LSE), internal clock (LSI) and RTC wakeup interrupt can be used as input to

general-purpose timer (TIM5 channel 4/TIM11 channel 1).