User Manual
24
Rev. 1.1
2019-03-18
TLE984xQX
Microcontroller with LIN and Power Switches for Automotive Applications
Modes of Operation
Reset Mode
The Reset Mode is a transition mode e.g. during power-up of the device after a power-on reset. In this mode
the on-chip power supplies are enabled and all other modules are initialized. Once the core supply VDDC is
stable, the Active Mode is entered. In case the watchdog timer WDT1 fails for more than four times, a fail-safe
transition to the Sleep Mode is done.
Active Mode
In Active Mode all modules are activated and the TLE984xQX is fully operational.
Stop Mode
The Stop Mode is one out of two major low power modes. The transition to the low power modes is done by
setting the respective Bits in the mode control register. In Stop Mode the embedded microcontroller is still
powered allowing faster wake-up reaction times, but not clocked. A wake-up from this mode is possible by LIN
bus activity, the High Voltage Monitor Input pins or the respective 5V GPIOs.
Sleep Mode
The Sleep Mode is a major low-power mode. The transition to the low-power modes is done by setting the
respective Bits in the Micro Controller Unit mode control register. The sleep time is configurable. In Sleep
Mode the embedded microcontroller power supply is deactivated, allowing the lowest system power
consumption, but the wake-up time is longer compared to the Stop Mode. In this mode a 64 bit wide buffer for
data storage is available. A wake-up from this mode is possible by LIN bus activity or the High Voltage Monitor
Input pins and cyclic wake. A wake-up from Sleep Mode behaves similar to a power-on reset. While changing
into Sleep Mode, no incoming wake-requests are lost (i.e. no dead-time). It is possible to enter sleep-mode
even with LIN dominant.
Cyclic Wake-up Mode
The cyclic wake-up mode is a special operating mode of the Sleep Mode and the Stop Mode. The transition to
the cyclic wake-up mode is done by first setting the respective Bits in the mode control register followed by
the SLEEP or STOP command. Additional to the cyclic wake-up behavior (wake-up after a programmable time
period), the wake-up sources of the normal Stop Mode and Sleep Mode are available.
Cyclic Sense Mode
The cyclic sense mode is a special operating mode of the Sleep Mode and the Stop Mode. The transition to the
cyclic sense mode is done by first setting the respective Bits in the mode control register followed by the STOP
or SLEEP command. In cyclic sense mode the High-Side Switch can be switched on periodically for biasing
some switches for example. The wake-up condition is configurable, when the sense result of defined monitor
inputs at a window of interest changed compared to the previous wake-up period or reached a defined state
respectively. In this case the Active Mode is entered immediately.
The following table shows the possible power mode configurations of each major module or function
respectively.
Table 4
Power Mode Configurations
Module/function
Active Mode
Sleep Mode
Stop Mode
Comment
VPRE, VDDP, VDDC
ON
OFF
ON
–
VDDEXT
ON/OFF
OFF
cyclic ON/OFF
–
HSx
ON/OFF
cyclic ON/OFF
cyclic ON/OFF
cyclic sense