TLE9879QXA40
Modes of Operation
Data Sheet 16 Rev. 1.0, 2017-02-02
Sleep Mode is activated after 5 consecutive watchdog failures or in case of supply failure (5 times). In this case,
MON is enabled as the wake source and Cyclic Wake-Up is activated with 1s of wake time.
Sleep Mode with Cyclic Wake-Up
The Cyclic Wake-Up Mode is a special operating mode of the Sleep Mode. The transition to Cyclic Wake-Up Mode
is performed by first setting the corresponding bits in the mode control register followed by the Sleep and Stop
Mode command. In addition to the cyclic wake-up behavior (wake-up after a programmable time period),
asynchronous wake events via the activated sources (LIN and/or MON) are available, as in normal Sleep Mode.
When using Sleep Mode with cyclic wake-up the voltage regulator is switched off and started again with the wake.
A limited number of registers is buffered during sleep, and can be used by SW e.g. for counting sleep/wake cycles.
MCU Slow Down Mode
In MCU Slow Down Mode the MCU frequency is reduced for saving power during operation. LIN communication
is still possible. LS MOSFET can be activated.
Wake-Up Source Prioritization
All wake-up sources have the same priority. In order to handle the asynchronous nature of the wake-up sources,
the first wake-up signal will initiate the wake-up sequence. Nevertheless all wake-up sources are latched in order
to provide all wake-up events to the application software. The software can clear the wake-up source flags. This
is to ensure that no wake-up event is lost.
As default wake-up source, the MON input is activated after power-on reset only. Additionally, the device is in
Cyclic Wake-Up Mode with the max. configurable dead time setting.
The following table shows the possible power mode configurations including the Stop Mode.
Table 3 Power Mode Configurations
Module/Function Active Mode Stop Mode Sleep Mode Comment
VDDEXT ON/OFF ON (no dynamic
load)/OFF
OFF –
Bridge Driver ON/OFF OFF OFF
LIN TRx ON/OFF wake-up only/
OFF
wake-up only/
OFF
–
VS sense ON/OFF
brownout
detection
brownout detection POR on VS brownout det. done in
PCU
GPIO 5V (wake-up) n.a. disabled/static OFF –
GPIO 5V (active) ON ON OFF –
WDT1 ON OFF OFF –
CYCLIC WAKE n.a. cyclic wake-up/
cyclic sense/OFF
cyclic wake-up/
OFF
–
Measurement ON
1)
OFF OFF –
MCU ON/slow-
down/STOP
STOP
2)
OFF –
CLOCK GEN (MC) ON OFF OFF –
LP_CLK (18 MHz) ON OFF OFF WDT1
LP_CLK2 (100 kHz) ON/OFF ON/OFF ON/OFF for cyclic wake-up