33910 datasheet(69/90 Pages) FREESCALE

69 / 90 page

Analog Integrated Circuit Device Data

Freescale Semiconductor

33910

FUNCTIONAL DEVICE OPERATIONS

OPERATIONAL MODES

MC33910BAC / MC34910BAC

FUNCTIONAL DEVICE OPERATIONS

OPERATIONAL MODES

INTRODUCTION

The 33910 offers three main operating modes: Normal

(Run), Stop, and Sleep (Low Power). In Normal mode the

device is active and is operating under normal application

conditions. The Stop and Sleep modes are low power modes

with wake-up capabilities.

In Stop mode the voltage regulator still supplies the MCU

with VDD (limited current capability) and in Sleep mode the

voltage regulator is turned off (VDD = 0 V).

Wake-up from Stop mode is initiated by a wake-up

interrupt. Wake-up from Sleep mode is done by a reset and

the voltage regulator is turned back on.

The selection of the different modes is controlled by the

MOD1:2 bits in the mode control register (MCR).

Figure 36 describes how transitions are done between the

different operating modes and Table 35, gives an overview of

the Operating mode.

RESET MODE

The 33910 enters the Reset mode after a power up. In this

mode, the RST pin is low for 1.0 ms (typical value). After this

delay, the 33910 enters the Normal Request mode and the

RST pin is driven high.

The Reset mode is entered if a reset condition occurs (VDD

low, watchdog trigger fail, after a wake-up from Sleep mode,

Normal Request mode timeout occurs).

NORMAL REQUEST MODE

This is a temporary mode automatically accessed by the

device after the Reset mode or after a wake-up from Stop

mode.

In Normal Request mode, the VDD regulator is ON, the

Reset pin is high and the LIN is operating in Rx Only mode.

As soon as the device enters the Normal Request mode

an internal timer is started for 150 ms (typical value). During

these 150 ms, the MCU must configure the timing control

ste = 0 to enter in Normal mode. If within the 150 ms timeout

the MCU does not command the 33910 to Normal mode, it

will enter in Reset mode. If the WDCONF pin is grounded in

order to disable the watchdog function, the 33910 goes

directly in Normal mode after the Reset mode. If the

WDCONF pin is open, the 33910 stays typically for 150 ms in

Normal Request before entering in Normal mode.

NORMAL MODE

In Normal mode, all 33910 functions are active and can be

controlled by the SPI and the PWMIN pin.

The VDD regulator is ON and delivers its full current

capability.

If an external resistor is connected between the WDCONF

pin and the Ground, the window watchdog function will be

enabled.

The wake-up input (L1) can be read as a digital input or

have its voltage routed through the analog-multiplexer.

The LIN interface has slew rate and timing compatible with

the LIN protocol specification 2.0. The LIN bus can transmit

and receive information.

The high side switches are active and have PWM

capability according to the SPI configuration.

The interrupts are generated to report failures 5 for VSUP

over/under-voltage, thermal shutdown or thermal shutdown

prewarning on the main regulator.

SLEEP MODE

The Sleep mode is a low power mode. From Normal

mode, the device enters the Sleep mode by sending one SPI

command through the MCR. All blocks are in their lowest

power consumption condition. Only some wake-up sources

(wake-up input with or without cyclic sense, forced wake-up

and LIN receiver) are active. The 5.0 V regulator is OFF. The

internal low-power oscillator may be active if the IC is

configured for cyclic-sense. In this condition, one of the high

side switches is turned on periodically and the wake-up

inputs are sampled.

Wake-up from Sleep mode is similar to a power-up. The

device goes in Reset mode except that the SPI will report the

wake-up source and the BATFAIL flag is not set.

STOP MODE

The Stop mode is the second low power mode, but in this

case the 5.0 V regulator is ON with limited current drive

capability. The application MCU is always supplied while the

33910 is operating in Stop mode.

The device can enter in Stop mode only by sending the

SPI command. When the application is in this mode, it can

wake-up from the 33910 side (for example: cyclic sense,

force wake-up, LIN bus, wake inputs) or the MCU side (CS,

RST pins). Wake-up from Stop mode will transition the 33910

to Normal Request mode and generates an interrupt except

if the wake-up event is a low to high transition on the CS pin

or comes from the RST pin.

33910 датащи(PDF) 69 Page - Freescale Semiconductor, Inc

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