33911 datasheet(25/45 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33911

FUNCTIONAL DEVICE OPERATIONS

OPERATIONAL MODES

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 33911 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 the 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. 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.

Following is a list of the interrupt sources in Normal and

Normal Request Modes, some of those can be masked by

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

Low-voltage Interrupt

The low-voltage interrupt signals when the supply line

(VS1) voltage drops below the VSUV threshold (VSUV).

High-voltage Interrupt

The high-voltage interrupt signals when the supply line

(VS1) voltage increases above the VSOV threshold (VSOV).

Over-temperature Prewarning

Over-temperature prewarning signals when the 33911

temperature has reached the pre-shutdown warning

threshold. It is used to warn the MCU that an over-

temperature shutdown in the main 5V regulator is imminent.

LIN Over-current Shutdown / 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, except for the LIN over-

current. In order to restart an operation, the fault must be

removed and must be acknowledged by reading the SPI.

The LINOC bit functionality in the LIN Status Register

(LINSR) is to indicate that an LIN over-current occurred and

the driver stays enabled.

High Side Over-temperature Shutdown

The high side over-temperature shutdown signals a

shutdown in the high side output.

Low Side Over-temperature Shutdown

The low side over-temperature shutdown signals a

shutdown in the low side outputs.

Table 5. Operating Modes Overview

Function

Reset Mode Normal Request Mode

Normal

Mode

Stop Mode

Sleep Mode

VDD

Full

Stop

LSx

SPI/PWM(55)

SPI/PWM

HS1

SPI/PWM(55)

SPI/PWM

Note(56)

Note(57)

Analog Mux

SPI

Inputs

Wake-up

LIN

Rx-Only

full/Rx-Only

Rx-Only/Wake-up

Wake-up

Watchdog

150ms (typ.) timeout

On (58)/Off

VSENSE

VDD

Notes

55.

Operation can be controlled by the PWMIN input.

56.

HS switch can be configured for cyclic sense operation in Stop Mode.

57.

HS switch can be configured for cyclic sense operation in Sleep Mode.

58.

Windowing operation when enabled by an external resistor.

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