33989 datasheet(27/66 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33989

FUNCTIONAL DEVICE OPERATION

RESET AND WATCHDOG PINS, SOFTWARE WATCHDOG OPERATIONS

Figure 12. Simplified Schematic for Flash Programming

PACKAGE AND THERMAL CONSIDERATION

The device is proposed in a standard surface mount

SOIC28 package. In order to improve the thermal

performances of the SOIC28 package, eight pins are

internally connected to the lead frame and are used for heat

transfer to the printed circuit board.

Table 6, page 24, describes the SBC operation modes.

Normal, Stand-by, and Stop Debug modes are entered

through special sequence described in the Debug mode

paragraph.

Figure 13. State Machine (Not Valid in Debug Modes)

SBC

MCU = Flash

VDD1

RST

External supply and sources applied to

VDD1, RST,

VSUP (Open or > 5.0 V

and WD test points on application circuit board.

Programming Bus

Notes These two SPI commands must be sent consecutively in this sequence.

30.

If WD activated.

Power

Down

Reset

Normal

Stand-by

Stop

Normal

Sleep

Reset Counter (3.4

ms) Expired

VDD1 Low OR WD:

Timeout 350 ms

&!Nostop

SPI: Stand-by

& WD Trigger

SPI: Stop & CS

Low to High

Transition

WD: Timeout OR VDD1 Low

WD:

Timeout

Nostop

WD: Timeout OR VDD1 Low

: T

1 L

Wake-up

(VDD1 High Temperature OR (VDD11 Low > 100ms & VSUP >BFew)) & Nostop &!BATFAIL

denotes priority

STATE MACHINE DESCRIPTION:

28.

Nostop = Nostop bit = 1

29.

! Nostop = Nostop bit = 0

30.

BATFAIL = Batfail bit = 1

31.

! BATFAIL = Batfail bit = 0

32.

VDD1 Over Temperature = VDD1 thermal shutdown occurs

33.

VDD1 low = VDD1 below reset threshold

34.

VDD1 low >100 ms = VDD1 below reset threshold for more than 100 ms

35.

WD: Trigger = TIM1 register write operation.

33989 Datasheet(PDF) 27 Page - Freescale Semiconductor, Inc

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