TLE9461ES datasheet(36/140 Pages) INFINEON

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TLE9461ES

Lite CAN SBC Family

System Features

Datasheet

Rev.1.1

2019-09-27

The Cyclic Sense function is disabled at the following conditions (WK/VSENSE is automatically switched to

Static Sense):

• in case SBC Fail-Safe Mode is entered: The HS GPIO switch is disabled and the wake pin is changed to static

sensing. An unintended wake-up event could be triggered when the WK/VSENSE input is changed to static

sensing.

• In SBC Normal, Stop, or Sleep Mode in case of an overcurrent or overtemperature (TSD2) event: the HS

GPIO switch is disabled

Note:

The internal timer for Cyclic Sense is not cleared automatically in case the HS switch is turned Off due

to above mentioned failures. The timer is only cleared during SBC Restart Mode. This must be

considered to avoid a loss of wake-up events, especially before entering SBC Sleep Mode, i.e. the

software must ensure that at least another wake source is active or re-enable the GPIO HS again.

5.2.1.2

Cyclic Sense in Low-Power Mode

If Cyclic Sense is intended for use in SBC Stop or SBC Sleep Mode, it is necessary to activate Cyclic Sense in SBC

Normal Mode before going to the low-power mode. A wake-up event due to Cyclic Sense sets the bit WK_WU.

In SBC Stop Mode a wake-up event triggers an interrupt, in SBC Sleep Mode the wake-up event moves the

device via SBC Restart Mode to SBC Normal Mode.

Before returning to SBC Sleep Mode, the wake status registers WK_STAT_0 and WK_STAT_1 need to be

cleared. Trying to go to SBC Sleep Mode with uncleared wake flags leads to a direct wake-up from Sleep Mode

by going via Restart Mode to Normal Mode and triggering of RSTN.

The intention of this behavior is to prevent a loss of a wake-up event during the transition.

Note:

if an over-current shutdown occurs at the GPIO HS in SBC Sleep Mode, while configured as Cyclic

Sense, and Cyclic Sense is the only wake source, then the SBC leaves SBC Sleep Mode immediately

because there is no other wake source available .

5.2.2

Cyclic Wake

The Cyclic Wake feature is intended to reduce the quiescent current of the device in the application. The

internal timer wakes the load, e.g. the microcontroller, periodically while it is in a low-power mode for the

most of the time.

For the Cyclic Wake feature the timer is configured as an internal wake-up source and periodically triggers an

interrupt on INTN in SBC Normal and SBC Stop Mode. During SBC Sleep Mode, the timer periodically wakes

the device (via SBC Restart to SBC Normal Mode).

The correct sequence to configure the Cyclic Wake is shown in Figure 11. The sequence is as follows:

• Enable Timer as a wake-up source in the register WK_CTRL_0,

• Configure the period of the Timer. Also an On-time (any value except ‘000’ or ‘110’ or ‘111’) must be

selected to start the Cyclic Wake function.

TLE9461ES Datasheet(PDF) 36 Page - Infineon Technologies AG

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