User Manual
65
Rev. 1.1
2019-03-18
TLE984xQX
Microcontroller with LIN and Power Switches for Automotive Applications
Power Management Unit (PMU)
6.6
Cyclic Management Unit (CMU)
The cyclic management unit is responsible for controlling the timing sequence in cyclic sense or cyclic wake
operation. The unit operates with the LP_CLK2 clock.
6.6.1
Cyclic Sense Mode
To select a dedicated MONx pin for cyclic sense mode, the bit MONx_CYC must be set in the corresponding
MONx_CTRL_STS
register. In this configuration the wake-up information of this MON pin is only accepted
during the sensing time where the HS_CYC_ON (internal HSx_ON gating signal) is high (see
). The
sensing time where the enable signal is active, will be set in the
. The flags inside
register are used to configure the dead time (T
Dead
.CYC_SENSE_S_DEL
register is used to
program the sample delay of the wake inputs and thus the on-time (T
On
)
After a valid wake-up event the start-up sequence is similar to the asynchronous wake-up and the system
enters the Start-up Mode automatically too. If the PMU detects a wake-up during Cyclic Sense then the enable
signal of the current source (HS) stays active as long the application software doesn’t disable these signals.
illustrates the principle of the cyclic sense mode. Here a high-side switch is used as current source
together with a MONx pin as a wake-up source. The same timing flow can also be applied for cyclic operation
with VDDEXT and all GPIOs from Port 1.