TLE9461ES datasheet(40/140 Pages) INFINEON

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TLE9461ES

Lite CAN SBC Family

System Features

Datasheet

Rev.1.1

2019-09-27

5.4

High-Voltage Measurement Interface

5.4.1

Block Description

This function provides the possibility to measure a voltage, e.g. the unbuffered battery voltage, with the

protected WK/VSENSE HV-input. The measured voltage is routed out at FO/GPIO in case it is not configured as

FO.

A simple external voltage divider needs to be placed to provide the appropriate voltage level to the

microcontroller A/D converter input. For power-saving reasons, the function is available only in SBC Normal

Mode and it is disabled in all other SBC modes.

The benefit of the function is that the signal is measured by a HV-input pin and that there is no current flowing

through the resistor divider during low-power modes.

The functionality is shown in a simplified application diagram in Figure 46.

5.4.2

Functional Description

This measurement function is by default disabled. In this case, WK/VSENSE and FO/GPIO have their default

functionality. The switch S_MEAS is open for this configuration (see Figure 46), i.e. there is no connection

between the pins. The measurement function can be enabled via the SPI bit WK_MEAS. If WK_MEAS is set to

‘1’, then the measurement function is enabled and the switch S_MEAS is closed in SBC Normal Mode. S_MEAS

is open in all other SBC modes. In this function the pull-up and pull-down currents of WK/VSENSE and FO/GPIO

are disabled and the internal WK/VSENSE and FO/GPIO signals are gated. In addition, the settings for

WK/VSENSE and FO/GPIO in the registers WK_PUPD_CTRL, WK_CTRL_1 and GPIO_CTRL are ignored but

changing these setting is not prevented. The registers WK_STAT_0, WK_STAT_1 and WK_LVL_STAT are not

updated with respect to the inputs WK/VSENSE and FO/GPIO. However, if only WK/VSENSE or GPIO WK are set

as wake sources and a SBC Sleep Mode command is set, then the SPI_FAIL flag is set and the SBC changes into

SBC Restart Mode (see Chapter 5.1 also for wake capability of WK/VSENSE and GPIO WK).

If WK_MEAS is set then neither the FO (including the FO test via FO_ON) nor the GPIO functionality or wake

functionality is available. Trying to change the GPIO_CTRL configurations will set the SPI_FAIL.

If FO/GPIO is configured as FO or any other GPIO configuration, then WK_MEAS cannot be set and SPI_FAIL is

triggered, i.e. FO/GPIO must be first set Off initially.

Table 11

Differences between Normal WK Function and Measurement Function

Affected Settings/Modules

for WK/VSENSE and

FO/GPIO Inputs

WK_MEAS = 0

WK_MEAS = 1

S_MEAS configuration

‘open’

‘closed’ in SBC Normal Mode,

‘open’ in all other SBC Modes but

configuration is kept

Internal WK/VSENSE &

FO/GPIO signal processing

Default wake and level signaling

function,

WK_STAT_0, WK_STAT_1 and

WK_LVL_STAT are updated

accordingly

WK/VSENSE and FO/GPIO signals are

gated internally, WK_STAT_0,

WK_STAT_1 and WK_LVL_STAT are

not updated

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