33910 Datasheet, PDF(25/44 Page) Freescale Semiconductor, Inc – LIN System Basis Chip with 2x60mA High Side Drivers

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33910 Datasheet, PDF (25/44 Pages) Freescale Semiconductor, Inc – LIN System Basis Chip with 2x60mA High Side Drivers

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FUNCTIONAL DEVICE OPERATIONS

OPERATIONAL MODES

Table 5. Operating Modes Overview

Function

Reset Mode Normal Request Mode

Normal

Mode

Stop Mode Sleep Mode

VDD

full

stop

HVDD

HSx

SPI(51)

SPI/PWM(52)

SPI

SPI/PWM

Note(53)

Analog Mux

SPI

Input

Wake-up

LIN

Watchdog

Rx-Only

full/Rx-Only Rx-Only/Wake-up

150ms (typ.) timeout On(55)/Off

VSENSE

VDD

Notes

51. Operation can be enabled/controlled by the SPI.

52. Operation can be controlled by the PWMIN input.

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

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

55. Windowing operation when enabled by an external resistor.

Note(54)

Wake-up

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. 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

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 5V regulator is

imminent.

LIN Over-Current Shutdown / Over-Temperature

Shutdown / TXD Stuck At Dominant / RXD Short-Circuit

These signal faulty conditions in the LIN interface (except

the LIN over-current) that had led to disable the LIN driver. In

order to restart 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

Signals a shutdown of the high side outputs.

RESET

To reset an MCU, the 33910 drives the RST pin low for the

time the reset condition lasts.

After the reset source has been removed the state

machine will drive the RST output low for at least 1ms typical

value before driving it high.

In the 33910 four main reset sources exist:

5V Regulator Low-Voltage-Reset (VRSTTH)

The 5V regulator output VDD is continuously monitored

against brown outs. If the supply monitor detects that the

voltage at the VDD pin has dropped below the reset threshold

VRSTTH the 33910 will issue a reset. In case of over-

Analog Integrated Circuit Device Data

Freescale Semiconductor

33910

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