TLE9461ES datasheet(33/140 Pages) INFINEON

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TLE9461ES

Lite CAN SBC Family

System Features

Datasheet

Rev.1.1

2019-09-27

5.2.1.1

Configuration and Operation of Cyclic Sense

The correct sequence to configure the Cyclic Sense is shown in Figure 7. All the configurations have to be

performed before the On-time is set in the TIMER_CTRL registers.

Cyclic Sense (=Timer) starts as soon as the respective On-time has been selected independently from the

assignment of the HS and the filter configuration.

The correct configuration sequence is as follows:

• Configuring GPIO as HS with Cyclic Sense functionality

• Enabling WK/VSENSE as wake source

• Selecting the pull-up/down configuration, all configurations are valid for Cyclic Sense, recommended is

the automatic pull-up / down selection

• Configuring the timer period and On-time

Figure 7

Cyclic Sense: Configuration and Sequence

Note:

If the sequence is not ensured the Cyclic Sense function might not work properly, e.g. an interrupt

could be missed or an unintentional interrupt could be triggered. However, if Cyclic Sense is the only

wake source and configured properly (e.g. Timer not yet set), then SBC Restart Mode is entered

immediately because no valid wake source was set.

Note:

All configurations of period and On-time can be selected. However, recommended On-times for

Cyclic Sense are 0.1ms, 0.3ms and 1ms for quiescent current saving reasons. The SPI_FAIL is set if the

On-time is longer than the period.

Note:

A learning cycle is started every time when the timer is started via the On-time and GPIO is

configured as HS with Cyclic Sense = ‘011 (i.e. the Cyclic Sense function is enabled).

Cyclic Sense Configuration

Configure GPIO as HS with cyclic

sense function by setting

GPIO = ‚011' in GPIO_CTRL

Cyclic Sense starts / ends by

setting / clearing On-time

GPIO_CTRL configure as HS

Select Timer Period and desired

On-Time in TIMER_CTRL

Period : 10, 20, 50, 100, 200 ms, 500ms, 1s, 2s,

5s, 10s, 20s, 50s, 100s, 200s, 500 s, 1000s

On-Time: 0.1, 0.3, 1.0, 10, 20ms

Select WK pull-up / pull-down

configuration in WK_PUPD_CTRL

No pull-up/-down, pull-down or pull -up

selected, automatic switching

A new timer configuration will become active

immediately , i.e. as soon as CSN goes high

Enable WK as a wake source

WK_CTRL_1

WK_EN in WK_CTRL_1

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