33910 datasheet(29/90 Pages) FREESCALE

29 / 90 page

Analog Integrated Circuit Device Data

Freescale Semiconductor

33910

FUNCTIONAL DEVICE OPERATIONS

OPERATIONAL MODES

MC33910G5AC/MC3433910G5AC

INTERRUPTS

Interrupts are used to signal a microcontroller that a

peripheral needs to be serviced. The interrupts which can be

generated, change according to the operating mode. While in

Normal and Normal Request modes, the 33910 signals

through interrupts special conditions which may require a

MCU software action. Interrupts are not generated until all

pending wake-up sources are read in the Interrupt Source

While in Stop mode, interrupts are used to signal wake-up

events. Sleep mode does not use interrupts. Wake-up is

performed by powering-up the MCU. In Normal and Normal

Request mode the wake-up source can be read by SPI.

The interrupts are signaled to the MCU by a low logic level

of the IRQ pin, which will remain low until the interrupt is

acknowledged by a SPI read command of the ISR register.

The IRQ pin will then be driven high.

Interrupts are only asserted while in Normal, Normal

Request and Stop mode. Interrupts are not generated while

the RST pin is low.

The following is a list of the interrupt sources in Normal and

Normal Request modes. Some of these can be masked by

writing to the SPI - Interrupt Mask Register (IMR).

Low-voltage Interrupt:

Signals when the supply line (VS1) voltage drops below

the VSUV threshold (VSUV).

High-voltage Interrupt:

Signals when the supply line (VS1) voltage increases

above the VSOV threshold (VSOV).

Over-temperature Prewarning:

Signals when the 33910 temperature has reached the pre-

shutdown warning threshold. It is used to warn the MCU that

an over-temperature shutdown in the main 5.0 V regulator is

imminent.

LIN Over-temperature Shutdown / TXD Stuck At

Dominant / RXD Short-circuit:

These signal fault conditions within the LIN interface will

cause the LIN driver to be disabled. In order to restart the

operation, the fault must be removed and TXD must go

recessive.

High Side Over-temperature Shutdown:

Signals a shutdown in the high side outputs.

Table 6. Operating Modes Overview

Function

Reset Mode

Normal Request Mode

Normal Mode

Stop Mode

Sleep Mode

VDD

Full

Stop

HVDD

SPI(58)

SPI

HSx

SPI/PWM(59)

SPI/PWM

Note(60)

Note(61)

Analog Mux

SPI

Input

Wake-up

LIN

Rx-Only

Full/Rx-Only

Rx-Only/Wake-up

Wake-up

Watchdog

150 ms (typ.) timeout

On(62)/Off

Voltage Monitoring

VSUP/VDD

VDD

Notes

58.

Operation can be enabled/controlled by the SPI.

59.

Operation can be controlled by the PWMIN input.

60.

HSx switches can be configured for cyclic sense operation in Stop mode.

61.

HSx switches can be configured for cyclic sense operation in Sleep mode.

62.

Windowing operation when enabled by an external resistor.

33910 Datasheet(PDF) 29 Page - Freescale Semiconductor, Inc

33910 Datasheet(HTML) 29 Page - Freescale Semiconductor, Inc

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