E520.14 Datasheet, PDF (31/41 Pages) ELMOS Semiconductor AG – Provides four HS-CAN physical interfaces

Quad CAN transceiver
PRODUCTION DATA – FEB 4, 2014
E520.14
4.4 Local wake up; pin WK
The device can be locally woken up via pin WK. It can be woken up with either rising or falling edge. The edge
sensitivity can be configured in register WAKE_CFG. To suppress glitches at the pin the input is debounced with
tWK,DEB.
If the local wake up is not used in application, the pin WK has to be connected to pin VS.
A transition into state SLEEP is prohibited with a pending wake up request. The request must be cleared via SPI
reading register WU_SRC.
4.5 Interrupt; pin INTN
The interrupt pin INTN is set L if the following interrupt sources/conditions occur:
• wake up event at CAN or WK
• CAN communication failures
• over temperature occurence
• undervoltage at VS, VCC or VIO
Interrupts can be enabled in configuration registers of the corresponding modules.
For over temperature, CAN communication failures and undervoltage the appearance and disappearance is
signaled via an interrupt. Therefore after SPI reading of interrupt source pin INTN is not blocked if the interrupt
condition is still active.
Do read corresponding status registers in order to clear interrupt, see graphic Fig. 6.
Fig. 6: Interrupt and status register dependency
Elmos Semiconductor AG reserves the right to change the detail specifications as may be required to permit improvements in the design of its products.
Elmos Semiconductor AG
Data Sheet 31 / 41
QM-No.: 25DS2014E.02