User Manual
948
Rev. 1.1
2019-03-18
TLE984xQX
Microcontroller with LIN and Power Switches for Automotive Applications
Low-Side Switch
Figure 218 Module Block Diagram
27.2
Functional Description
The low-side switches can generally be controlled in two different ways:
• In normal mode the output stage is fully controllable through the
SFR
Registers
LSx_CTRL
. Protection
functions as overcurrent and overtemperature are available.
• The PWM Mode can also be enabled by a
LSx_CTRL - SFR
bit. The PWM configuration has to be done in the
corresponding PWM Module (CCU6). All protection functions are also available in this mode. The maximum
PWM frequency must not exceed 25 kHz (fast slew rate only).
27.2.1
Normal Operation
In normal operation mode (CPU normal mode, CPU slow down mode) the low-side switch provides
functionalities and protection functions which are:
•
selectable Slew Rate Control
for improved EMI behavior.
•
Overcurrent Detection
with threshold (min.) 270 mA.
•
Overtemperature Protection
, to protect the switch against overtemperature.
In device stop mode and device sleep mode the low-side driver is switched off and disabled. The user software
does not need to take care about the proper power down sequence of this module. This is done by hardware.
In stop mode the configuration of the driver is kept inside the corresponding sfrs. If the driver was switched on
before entering stop mode, after a wakeup its status is restored automatically.
Low Side
Driver
OC-Detection
Clamp
XSFR
270 mA
ON
LS
LSGND