TLE7809G datasheet(13/52 Pages) INFINEON

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Data Sheet

Rev. 3.01, 2008-04-15

TLE7809G

Operating Modes

4.5.2

SBC Stop Mode

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 bus transceivers and respective termination, but the voltage regulator for

the microcontroller supply remains active. A microcontroller in a power saving mode has the advantage over a

turned-off microcontroller to have a reduced reaction time upon a wake-up event.

A voltage level change at the monitoring/wake-up pins will, in contrast to the behavior in Sleep Mode, generate a

signal that indicates the wake-up event at the microcontroller in Power-Down Mode. This is realized via an

interconnect from the SPI of the SBC [DO] to the microcontroller [P1.4]. In case the wake-up event was a LIN

message, the respective RxD pin of the SBC and the SPI Data Out [DO] will be pulled “low”. RxD is pulled “low”

until mode switch, while DO stays “low” for two internal SBC cycles. (The microcontroller itself has to take care of

switching SBC modes after a wake-up event notification (see Figure 7).)

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, Watchdog

disable current threshold, Table 14 and “Window Watchdog Reset Period Settings” on Page 22).

Note: If the Window Watchdog was not enabled in Stop Mode the Window Watchdog starts after wake-up with a

“long open window” in SBC Standby Mode.

Figure 7

State Diagram “SBC Stop Mode”

Start Up

Power Up

SBC Active Mode

MS2

Vcc

MS1

MS0

0 / 1

SBC Stop Mode

MS2

Vcc

MS1

MS0

„single“ µController SPI -Command :

- select SBC Stop Mode via SPI Mode Bits

- window watchdog activation / deactivation via SPI

[„off“ once current consumption below threshold ]

transition caused by :

- event at MONx inputs

- LIN message

[SPI indicates source]

wake event notification [to µC]:

- LIN msg. => RxD + DO („low“)

- MONx => DO („low“)

SBC Standby Mode

Vcc

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