TLE9879QXA40
Modes of Operation
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
OFF
–
load)/OFF
Bridge Driver
LIN TRx
ON/OFF
ON/OFF
OFF
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)
GPIO 5V (active)
WDT1
n.a.
ON
ON
n.a.
disabled/static
OFF
OFF
OFF
–
–
–
–
ON
OFF
CYCLIC WAKE
cyclic wake-up/
cyclic sense/OFF
cyclic wake-up/
OFF
Measurement
MCU
ON1)
OFF
STOP2)
OFF
OFF
–
–
ON/slow-
down/STOP
CLOCK GEN (MC)
LP_CLK (18 MHz)
LP_CLK2 (100 kHz)
ON
OFF
OFF
–
ON
OFF
OFF
WDT1
ON/OFF
ON/OFF
ON/OFF
for cyclic wake-up
Data Sheet
16
Rev. 1.0, 2015-04-30
INFINEON [ Infineon ]
