TLE9461ES datasheet(89/140 Pages) INFINEON

89 / 140 page

TLE9461ES

Lite CAN SBC Family

Supervision Functions

Datasheet

Rev.1.1

2019-09-27

12.4

VS Under- and Overvoltage

12.4.1

VS Undervoltage

The VS under-voltage monitoring is always active in SBC Init-, Restart- and Normal Mode (see below

conditions for SBC Stop Mode). If the supply voltage VS reaches the undervoltage threshold VS,UV then the SBC

triggers the following actions:

•SPI bit VS_UV is set. No other error bits are set. The bit can be cleared once the VS undervoltage condition

is not present anymore

• The VCC1 short circuit protection becomes inactive (see Chapter 12.6). However, the thermal protection

of the device remains active. If the undervoltage threshold is exceeded (VS rising) then the function is

automatically enabled again

Note:

VS under-voltage monitoring is not available in SBC Stop Mode due to current consumption saving

requirements except if the VCC1 load current is above the active peak threshold (I_PEAK_TH) or if

VCC1 is below the VCC1 prewarning threshold.

12.4.2

VS Overvoltage

The VS over-voltage monitoring is always active SBC Init-, Restart- and Normal Mode (see below note for

conditions in SBC Stop Mode) or when the charge pump is enabled. If the supply voltage VS reaches the over-

voltage threshold VS,OV then the SBC does the following measures:

•SPI bit VS_OV is set. This bit is intended for diagnosis only, i.e. or other error bits are set. The bit can be

cleared once the VS over-voltage condition is not present anymore

If the charge pump is disabled after the bit VS,OV was set then the bit will stay set until it is cleared via SPI.

Note:

VS over-voltage monitoring is not available in SBC Stop Mode due to current consumption saving

requirements except if the VCC1 load current is above the active peak threshold (I_PEAK_TH) or if

VCC1 is below the VCC1 prewarning threshold.

12.5

VCC1 Over-/ Undervoltage and Undervoltage Prewarning

12.5.1

VCC1 Undervoltage and Undervoltage Prewarning

This function is always active when the VCC1 voltage regulator is enabled. The supervision is implemented at

the pin VIO (VIO must be connected to VCC1).

A first-level voltage detection threshold is implemented as a prewarning for the microcontroller. The

prewarning event is signaled with the bit VCC1_ WARN. No other actions are taken.

As described in Chapter 12.1 and Figure 37, a reset is triggered (RSTN pulled Low) when the VCC1 output

voltage falls below the selected undervoltage threshold (VRTx). The SBC enters SBC Restart Mode and the bit

VCC1_UV is set when RSTN is released again.

The hysteresis of the VCC1 undervoltage threshold can be increased by setting the bit RSTN_HYS. In this case

always the highest rising threshold (Vrt1,r) is used for the release of the undervoltage reset. The falling reset

threshold remains as configured.

Note:

The VCC1_ WARN or VCC1_UV bits are not set in Sleep Mode as VCC1 = 0V in this case

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