TLE9260-3QX Datasheet, PDF (85/175 Pages) Infineon Technologies AG – Dedicated Data Sheets are available for the different product variants

TLE9260-3QX
Wake and Voltage Monitoring Inputs
10.2.2 Alternate Measurement Function with WK1 and WK2
10.2.2.1 Block Description
This function provides the possibility to measure a voltage, e.g. the unbuffered battery voltage, with the protected
WK1 HV-input. The measured voltage is routed out at WK2. It allows for example a voltage compensation for LED
lighting by changing the duty cycle of the High-Side outputs. A simple voltage divider needs to be placed externally
to provide the correct voltage level to the microcontroller A/D converter input.
The function is available in SBC Normal Mode and it is disabled in all other modes to allow a low-quiescent current
operation.The measurement function can be used instead of the WK1 and WK2 wake and level signalling
capability.
The benefits 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 53.
10.2.2.2 Functional Description
This measurement function is by default disabled. In this case, WK1 and WK2 have the regular wake and voltage
level signalization functionality. The switch S1 is open for this configuration (see Figure 53).
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 switch S1 is closed in SBC Normal Mode.
S1 is open in all other SBC modes. If this function the pull-up and down currents of WK1 and WK2 are disabled,
and the internal WK1 and WK2 signals are gated. In addition, the settings for WK1 and WK2 in the registers
WK_PUPD_CTRL, WK_FLT_CTRL and WK_CTRL_2 are ignored but changing these setting is not prevented.
The registers WK_STAT_1 and WK_LVL_STAT are not updated with respect to the inputs WK1 and WK2.
However, if only WK1 or WK2 are set as wake sources and a SBC Sleep Mode command is set, then the SPI_FAIL
flag will be set and the SBC will be changed into SBC Restart Mode (see Chapter 5.1 also for wake capability of
WK1 and WK2).
Table 23 Differences between Normal WK Function and Measurement Function
Affected Settings/Modules WK_MEAS = 0
for WK1 and WK2 Inputs
WK_MEAS = 1
S1 configuration
‘open’
‘closed’ in SBC Normal Mode,
‘open’ in all other SBC Modes
Internal WK1 & WK2 signal
processing
Default wake and level signaling
‘WK1...2 inputs are gated internally,
function, WK_STAT_1, WK_STAT_2 WK_STAT_1, WK_STAT_2 are not
are updated accordingly
updated
WK1_EN, WK2_EN
Wake-up via WK1 and WK2 possible if setting the bits is ignored and not
bits are set
prevented. If only WK1_EN, WK2_EN
are set while trying to go to SBC Sleep
Mode, then the SPI_FAIL flag will be
set and the SBC will be changed into
SBC Restart Mode.
WK_PUPD_CTRL
normal configuration is possible
no pull-up or pull-down enabled
WK_FLT_CTRL
normal configuration is possible
setting the bits is ignored and not
prevented
Note: There is a diode in series to the switch S1 (not shown in the Figure 53), which will influence the temperature
behavior of the switch.
Data Sheet
85
Rev. 1.1, 2014-09-26