TLE7809G datasheet(14/52 Pages) INFINEON

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TLE7809G

Operating Modes

Data Sheet

Rev. 3.01, 2008-04-15

4.5.3

SBC Stop Mode with Cyclic Wake

The SBC Stop Mode has the advantage of reducing the current consumption to a minimum, while supplying the

microcontroller with its quiescent current during its power saving mode (“Stop”). This mode is entered via SPI

command, and turns-off the integrated LIN bus transceiver, but the voltage regulator remains active.

The SBC periodically generates a wake-up “low” pulse at DO (“interconnect signal”) that is connected to an

interrupt input [P1.4] of the microcontroller. This period can be defined via the “cyclic wake period” bit field within

the SPI register. This pulse at DO has a length of two internal SBC cycles.

In case of a detected wake-up event via LIN message or any of the MONx pins, DO stays “low” until the first valid

SPI command.

Note: The window watchdog is automatically disabled once the LDO output current goes below a specified

“watchdog current threshold”, unless the SPI setting “WD On/Off” prevents this (see Figure 10).

Note: A wake-up event via LIN message or via MONx inputs can happen independently of the cyclic wake phase.

Note: The Window Watchdog starts with a “long open window” after a mode switch, e.g. to SBC Active Mode.

Figure 8

State Diagram “SBC Stop Mode with Cyclic Wake”

µC 1)

Start Up

Power Up

SBC Active Mode

MS2

Vcc

MS1

MS0

0 / 1

STOP: Cyclic Wake

MS2

Vcc

MS1

MS0

cyclic wake-up

„single“ µController SPI -Command:

- select „cyclic wake timing“ via SPI Timing Bits

- select SBC Stop Mode via SPI Mode Bits

- window watchdog activation / deactivation via SPI

[„off“ once current consumption below threshold ]

µC wake-up inputs

1) window watchdog activated

automatically once current

threshold is exceeded

select SBC

operating

mode

SBC Standby Mode

Vcc

transition caused by:

- event at MONx inputs:

=> DO „low“

- LIN message

=> RxD + DO „low“

[SPI indicates source]

2) wake-up via MONx inputs and

LIN message independent of cyclic

wake phase („asynchronous“)

NOTES:

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