VNF9D5F datasheet(56/108 Pages) STMICROELECTRONICS

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Registers configuration

•

SPCR10 = 2h and SOCRx = 1: Asynchronous with continuous sampling

Asynchronous mode, the ADC result register is continuously refreshed, provided that the channel is

commanded either through the direct input signal or the SOCR register. Conversion is executed during the

complete conversion window except the priority arbitration. Since the ADC register is continuously

refreshed, its conversion priority is always lower than sampled channels.

•

SPCR10 = 3h and SOCRx = 1: Asynchronous with continuous sampling and digital LP filter

–

The integrated LP filter is activated

–

This component will filter data coming from the ADC conversion reducing the effect of random noise

coming from the analog Current Sense amplifier

•

SPCR10 = 3h, SOCRx = x and DIx = High: If a channel is commanded off through SOCR, but commanded

on through the Direct Input, the asynchronous sampling mode is forced

The thermal case sampling has always low priority for the ADC conversion, and so it can be interrupted by

any channel in sample mode. Thermal case conversion is always in Asynchronous continuous mode. In

Fail Safe condition the ADC conversion is always in Asynchronous/Continuous Mode.

–

Conversion is executed during the complete conversion window.

–

No Priority Management is applied, channels are converted according to their position in the stack.

No interruption and no priority management are possible. In case of multiple channels active at the

same time, the conversion will start with the first one in the stack.

Figure 27. Asynchronous with continuous sampling

PWM period

Sampling

point

Duty cycle

Phase shift

PWM

(with Synch mode/Falling)

Steady ON PWM 100%

(Synch mode/Falling)

PWM

(with Asynch mode)

Defined by Sampling point:

Rising/Mid/Falling + Asynch

Automatic triggering to end of PWM period

Sampling concept

•

PWM mode (internal engine) → All the synchronous modes are available(start, stop, continuous or filtered).

•

DC mode (internal engine) → ADC works in Continuous Mode. The conversion window follows the channel

control input signal.

–

DC mode by/without DI: No difference, since this condition is equivalent to PWM with 100% of duty

(the sampling will be always in continuous mode).

•

PWM mode by DI (external source) → the DIx information is combined (O-red) with the channel control

signal. Sampling will be executed according to the PWM mode settings.

–

With SPCRx = 2h, 3h, sampling is possible (continuous/filtered mode).

VNF9D5F

Diagnostic

DS13946 - Rev 8

page 56/108

VNF9D5F Datasheet(PDF) 56 Page - STMicroelectronics

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