MM908E624ACEWSLASHR2 datasheet(21/40 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

908E624

FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

908E624 ANALOG DIE MODES OF OPERATION

The 908E624 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.

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. Wakeup 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

MODE1:2 bits in the SPI Control register.

Figure 11 describes how transitions are done between the

different operating modes and Table 6, page 22, gives an

overview of the operating mode.

Figure 11. Operating Modes and Transitions

Reset

Power

Down

Notes:

WD - means Watchdog

WD disabled - means Watchdog disabled (WDCONF terminal connected to GND)

WD trigger – means Watchdog is triggered by SPI command

WD failed – means no Watchdog trigger or trigger occurs in closed window

STOP Command - means STOP command sent via SPI

SLEEP Command - means SLEEP command send via SPI

Wake-Up - means L1 or L2 state change or LIN bus wake up or SS rising edge

Normal

Request

VDD High and Reset Delay (tRST) expired

Normal

Normal Request timeout expired (NRTOUT)

Sleep

Wake-Up (Reset)

Stop

VDD Low

VDD Low (>NRTOUT) expired

and VSUV = 0

SLEEP Command

VDD Low

WD failed

Normal Request Timeout Expired (tNRTOUT)

VDD High and

Reset Delay (tRST) Expired

VDD Low

WD Failed

VDD LOW (>tNRTOUT) Expired

and LVF = 0

Sleep Command

Wake-Up (Reset)

Power Up

Legend

WD: Watchdog

WD Disabled: Watchdog disabled (WDCONF terminal connected to GND)

WD Trigger: Watchdog is triggered by SPI command

WD Failed: No watchdog trigger or trigger occurs in closed window

Stop Command: Stop command sent via SPI

Sleep Command: Sleep command sent via SPI

Wake-Up: L1 or L2 state change or LIN bus wake-up or SS rising edge

VDD Low

MM908E624ACEW/R2 Datasheet(PDF) 21 Page - Freescale Semiconductor, Inc

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