User Manual
949
Rev. 1.1
2019-03-18
TLE984xQX
Microcontroller with LIN and Power Switches for Automotive Applications
Low-Side Switch
27.2.1.1 Slew Rate Configuration
The low-side switch provides two slew rate configuration possibilities:
• 10V/µs (up to 5 kHz PWM frequency).
• 30V/µs (above 5 kHz PWM frequency).
The configuration can be done by flag LSx_SRCTL_SEL. The slew rate configuration is also taken for the pwm
mode.
27.2.1.2 Overcurrent Detection
If an overcurrent condition is present, the low-side switches will be automatically turned off. In parallel the
flag
LSx_OC_IS
is set and the LSx_ON flag is cleared. To enable the low-side switch again, it is recommended
to clear the
LSx_OC_IS
flag and then set the
LSx_ON
bit to reactivate the switch. Clearing only the
LSx_OC_IS
flag, would not turn the switch automatically on. If the overcurrent condition is still present, the switch will be
disabled once again.
27.2.1.3 Overtemperature Detection
If overtemperature condition appears, the switch will shutdown and the corresponding bit
LSx_OT_STS
is set.
To reenable the low-side switches, the same procedure as for the overcurrent condition has to be applied. Due
to the fact that overtemperature condition is removed very slowly (device has to cool down) in comparison to
the CPU time base, it is recommended to clear the status flag and to check if it is set again immediately after
clearing, before trying to switch the driver on again.
27.2.2
Operation of Low-Side Switch in PWM Mode
The low-side switch can also be operated in PWM Mode. To enable the PWM Mode of the Low-Side switch, the
corresponding bits
LSx_PWM
and
LSx_ON
in the control register LSx_CTRL have to be set. The implemented
combinatorial logic is shown in the next figure. PWM_CHx in
can be set in register
.
Figure 219 Module PWM Usage of Low-Side Switch
&
≥
1
LS_ON
&
LSS
SFR
GND_LS
LS
SCU_PM
CCU6 or
GPT12
1
PWM_CHx
ON
LS_PWM