908E621_07 Datasheet, PDF(24/62 Page) Freescale Semiconductor, Inc – Integrated Quad Half-Bridge and Triple High-Side with Embedded MCU and LIN for High End Mirror

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908E621_07 Datasheet, PDF (24/62 Pages) Freescale Semiconductor, Inc – Integrated Quad Half-Bridge and Triple High-Side with Embedded MCU and LIN for High End Mirror

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FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

908E621 ANALOG DIE MODES OF OPERATION

The 908E621 offers three operating modes: Normal (Run),

Stop, and Sleep. 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.

The different modes can be selected by the STOP and

SLEEP bits in the System Control Register.

Figure 11 describes how transitions are done between the

different operating modes and Table 6, page 26, gives an

overview of the operating modes.

Power

Down

Power Up

RESET

VDD High and Reset Delay (tRST) expired

Normal

Request

VDD Low

PSON = 0 and Normal Request

timeout (tNORMREQ) expired

Reset (LVR, HTR, WDR, ext. Reset)

NORMAL

SLEEP Command

Wake-Up (Reset)

Reset (LVR, ext. Reset)

SLEEP

STOP

Reset (LVR, ext. Reset, (HTR))

Figure 11. Operating Modes and Transitions

Normal Mode

This Mode is normal operating mode of the device, all

functions and power stages are active and can be enabled/

disabled. The voltage regulator provides the +5V VDD to the

MCU.

After a reset (e.g. Power On Reset, Wake-Up from Sleep)

the MCU has to set the PSON bit in the System Control

MCU has started up and is operating correctly. If the PSON

bit is not set within the required time frame the device is

entering SLEEP mode to reduce power consumption (fail

safe).

This MCU monitoring can be disabled e.g. for

programming by applying VDD on the TESTMODE terminal.

Stop Mode

In Stop mode the voltage regulator still supplies the MCU

with VDD (limited current capability). To enter the Stop mode

the STOP bit in the System Control Register has to be set

and the MCU has to be stopped also (see 908EY16

datasheet for details).

Wake-up from this mode is possible by LIN bus activity or

the wake-up input L0 and is maskable with the LINIE and/or

L0IE bits in the Interrupt Mask Register. The analog die is

generating an interrupt on IRQ_A terminal to wake-up the

MCU. The wake-up / interrupt source can be evaluated with

the L0IF and LINIF bits in the Interrupt Flag Register.

908E621

Analog Integrated Circuit Device Data

Freescale Semiconductor

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