User Manual
967
Rev. 1.1
2019-03-18
TLE984xQX
Microcontroller with LIN and Power Switches for Automotive Applications
Application Information
ground. The driver stages are not limited to a maximum voltage. Therefore an additional zener diode between
the gate and source of each MOSFET is recommended for protection.
For adjusting the required slope of the output voltage the resistors between the outputs HSx/LSx and the
power MOSFET gate have to be dimensioned in a specific way according to the application requirements. It’s
further recommended to additionally connect the respective gate potentials to battery (P-channel) or ground
(N-channel) by external resistors. This prevents the power half bridge from unwanted cross currents in case of
a TLE984xQX reset condition (driver stage is high impedance).
28.2.2.2 PWM operation
TLE984xQX supports PWM controlled motor drive with active free-wheeling (i.e. synchronous switching of the
half bridge MOSFETs to avoid body diode losses during PWM off phase) by using the CCU6 module.
The CCU6 can be configured to use the internal deadtime generation to control the switching delay between
the external P-and N-channel MOSFETs of the half-bridge. In this case HSx and LSx are switched without any
deadtime. The gate pre resistors has to be dimensioned expecting the max values.
28.2.2.3 MOSFET protection with integrated Differential Units for drain-source-
monitoring
For emergency shut-off in case of short-to-GND or short-to-VBAT, the following protection scheme can be
used.
For this feature, 3 of the MON inputs (e.g. MON1, MON2, MON4) are used in combination with 2 differential
measurement units (MON1-MON2, MON2-MON4), that are located in ADC1.
The differential measurement units are sampled by the ADC1 and use the post processing for threshold
supervision, interrupt generation and trap handling.
The ADC measurements are triggered from CCU6, i.e. aligned to the PWM signals.
28.3
Connection of N.C. / N.U. pins
The device contains several N.C. (not connected, no bond wire) and possibly N.U. (not used, but bonded) pins.
28.4
Connection of unused pins
shows recommendations how to connect pins, in case they are not needed by the application.
Table 515 Recommendation for connecting N.C. / N.U. pins
type
pin number
recommendation 1 recommendation 2
comment
N.C.
27, 28, 29, 38, 40, 41
GND
N.C.
10, 46
open
GND
neighboring high-voltage
pins
N.U.
4
VS
open
in device variants with one
high side only, no HS2
(product variant dependant)
N.U.
9
GND
in device variants with four
MON only, no MON5 (product
variant dependant)