TLE9879QXA40
Modes of Operation
4
Modes of Operation
This highly integrated circuit contains analog and digital functional blocks. An embedded 32-bit microcontroller is
available for system and interface control. On-chip, low-dropout regulators are provided for internal and external
power supply. An internal oscillator provides a cost effective clock that is particularly well suited for LIN
communications. A LIN transceiver is available as a communication interface. Driver stages for a Motor Bridge or
BLDC Motor Bridge with external MOSFET are integrated, featuring PWM capability, protection features and a
charge pump for operation at low supply voltage. A 10-bit SAR ADC is implemented for high precision sensor
measurement. An 8-bit ADC is used for diagnostic measurements.
The Micro Controller Unit (MCU) supervision and system protection (including a reset feature) is complemented
by a programmable window watchdog. A cyclic wake-up circuit, supply voltage supervision and integrated
temperature sensors are available on-chip.
All relevant modules offer power saving modes in order to support automotive applications connected to terminal
30. A wake-up from power-save mode is possible via a LIN bus message, via the monitoring input or using a
programmable time period (cyclic wake-up).
Featuring LTI, the integrated circuit is available in a VQFN-48-31 package with 0.5 mm pitch, and is designed to
withstand the severe conditions of automotive applications.
The TLE9879QXA40 has several operation modes mainly to support low power consumption requirements.
Reset Mode
The Reset Mode is a transition mode used e.g. during power-up of the device after a power-on reset, or after wake-
up from Sleep Mode. In this mode, the on-chip power supplies are enabled and all other modules are initialized.
Once the core supply VDDC is stable, the device enters Active Mode. If the watchdog timer WDT1 fails more than
four times, the device performs a fail-safe transition to Sleep Mode.
Active Mode
In Active Mode, all modules are activated and the TLE9879QXA40 is fully operational.
Stop Mode
Stop Mode is one of two major low power modes. The transition to the low power modes is performed by setting
the corresponding bits in the mode control register. In Stop Mode the embedded microcontroller is still powered,
allowing faster wake-up response times. Wake-up from this mode is possible through LIN bus activity, by using
the high-voltage monitoring pin or the corresponding 5V GPIOs.
Stop Mode with Cyclic Wake-Up
The Cyclic Wake-Up Mode is a special operating mode of the Stop Mode. The transition to the Cyclic Wake-Up
Mode is done by first setting the corresponding bits in the mode control register followed by the 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 Stop Mode.
Sleep Mode
The Sleep Mode is a low-power mode. The transition to the low-power mode is done by setting the corresponding
bits in the MCU mode control register or in case of failure, see below. In Sleep Mode the embedded microcontroller
power supply is deactivated allowing the lowest system power consumption. A wake-up from this mode is possible
by LIN bus activity, the High Voltage Monitor Input pin or Cyclic Wake-up.
Sleep Mode in Case of Failure
Data Sheet
15
Rev. 1.0, 2015-04-30
INFINEON [ Infineon ]
