33742 datasheet(33/70 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33742

FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

Figure 13. SBC State Diagram (Not Valid in Debug Modes)

Figure 14. Operation After SBC Power-Up

Notes

43.

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

44.

If watchdog activated.

(VDD High Temperature OR [VDD Low > 100 ms & VSUP > BFew]) & Nostop &!BATFAIL

Watchdog: Timeout & Nostop &!BATFAIL

Power

Down

Reset

Normal Request

Stop

Sleep

Reset Counter (3.4 ms)

Expired

VDD Low OR Watchdog:

Timeout 350 ms & Nostop

SPI: Standby and

Watchdog Trigger

SPI: Stop & CS

LOW to HIGH

Transition

Watchdog: Timeout OR VDD Low

atc

: T

ut O

w (4

Wake-Up

4 Denotes priority

State Machine Description

Nostop = Nostop bit = 1

!Nostop = Nostop bit = 0

BATFAIL = Batfail bit = 1

!BATFAIL = Batfail bit = 0

VDD Over-temperature = VDD thermal shutdown occurs

VDD LOW = VDD below reset threshold

VDD LOW > 100 ms = VDD below reset threshold for more than 100 ms

Watchdog: Trigger = TIM1 subregister write operation

VSUP > BFew = VSUP > Battery Fail Early Warning (6.1 V typical)

Watchdog: Timeout = TIM1 register not written before watchdog timeout period

expired, or watchdog written in incorrect time window if watchdog window

selected (except Stop mode). In Normal Request mode, timeout is 355 ms

p2.2 (350 ms p3) ms.

SPI: Sleep = SPI write command to MCR register, data sleep

SPI: Stop = SPI write command to MCR register, data stop

SPI: Normal = SPI write command to MCR register, data normal

SPI: Standby = SPI write command to MCR register, data standby

Normal

Standby

Power-Up

Reset

Normal

Request

Normal

Trigger

Batfail

No Stop

Sleep

Yes

Operation after power-up if no trigger appears

Operation after reset of BATFAIL if no trigger appears

33742 Datasheet(PDF) 33 Page - Freescale Semiconductor, Inc

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