33389 datasheet(23/49 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33389

FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

SBC Normal Mode

In this mode, V1 and V2 are active, V3 can be set active

or passive via the SPI. Therefore, the whole ECU can be

operated. Normal mode is entered by a SWCR configuration

in the Normal Request mode.

SBC Stand-by Mode

In this mode V1 is active and V2 is passive. V3 can be

either permanently active or permanently passive. This is a

low power mode with V1 active in order to have a fast

reaction time in case of any wake-up.

For Stand-by mode, the S Bus Circuit (SBC) monitors the

software. It means the microcontroller runs, is monitored, and

must serve as a watchdog trigger.

S Bus Circuit Sleep Mode

This is a low power consumption mode. V1 and V2 are

disabled. V3 can be permanently disabled or cyclically active.

Emergency Mode

In case the microcontroller detects the ECU or the system

is no longer under control, it may decide to switch the SBC to

the Emergency mode. V1, V2, and V3 become passive and

wake-ups are not detected. The only way to leave this mode

is to disconnect the ECU from the battery voltage (BatFail

detection).

Table 9. Normal Request: V1 Active and V2/V3 Passive

Entering Normal Request

Leaving Normal Request

SBC Reset Just Released

When First Receiving the SW

Timing Word, SBC goes to

Normal

—

If Time-out Without Receiving

SPI Commands (75ms), SBC

goes to Seep

Table 10. SBC Normal Mode: V1/V2 Active

While V3 is Active or Passive

Entering Normal Mode

Leaving Normal Mode

By SPI command

By SPI command, going to any

other mode

After SWCR register

configuration in

Normal Request mode

Watchdog time-out, going to

Normal Request after activat-

ing Reset

—

V1 undervoltage detection,

going to Normal Request mode

after activating Reset

Table 11. Stand-by: V1 Active, V2 Passive, V3 Active

or Passive, Watchdog is Active

Entering Stand-by

Leaving Stand-by

—

If SW Timeout Going to Normal

Request After

Microcontroller Reset

By SPI Command

By SPI Command Going to any

Other Mode

—

V1 Under Voltage Detection,

Going to Normal Request Mode

After Activating Reset

—

External Activation of the RST

Table 12. SBC Sleep Mode: V1/V2 are Passive,

V3 is Passive or Cyclic

Entering Sleep Mode

Leaving Sleep Mode

If SW Timing Not Configured

75 ms After Entering

Normal Request Mode

CAN Wake-Up, Going to

Normal Request

By SPI Command

If a Wake-Up is Detected with

Cyclic Sense

For 33389ADW Only: If V1 is

Below V1 Reset for More Than

100 ms

If a Wake-Up is Detected with

Wake-Up Not Connected to V3

(permanent sense)

—

Forced Wake-Up (See Forced

Wake-Up Section)

—

SPI Wake-Up (See Wake-Up

by SPI Section)

Table 13. SBC Emergency Mode: V1:V3 are Passive

Entering Emergency Mode

Leaving Emergency Mode

By SPI Command

SBC BatFail Detection (Discon-

nection of the Battery Voltage)

Table 11. Stand-by: V1 Active, V2 Passive, V3 Active

or Passive, Watchdog is Active

Entering Stand-by

Leaving Stand-by

33389 Datasheet(PDF) 23 Page - Freescale Semiconductor, Inc

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