TLE7826G datasheet(13/53 Pages) INFINEON

13 / 53 page

Data Sheet

Rev. 3.01, 2008-04-15

TLE7826G

Operating Modes

4.5

Power Saving Modes

4.5.1

SBC Sleep Mode

During SBC Sleep Mode (see Figure 6), the lowest power consumption is achieved, by having its main voltage

regulator switched-off. As the microcontroller cannot be supplied, the integrated window watchdog can be disabled

in Sleep Mode via a dedicated SPI control bit. However, it can be turned-on for periodically waking-up the system,

e.g. ECU, by generating a reset and automatically switching to SBC Standby Mode.

This mode is entered via SPI command, and turns-off the integrated LIN bus transceiver, main voltage regulator

as well as all switches. Upon a voltage level change at the monitoring / wake-up pins or by LIN message the SBC

Sleep Mode will be terminated and the SBC Standby Mode will automatically be entered (turning-on the LDO).

Note: Upon a wake-up via LIN message the (internal) RxD signal stays “low” until mode switch.

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

“long open window” in SBC Standby Mode.

Note: In Sleep Mode with activated watchdog (see Table 2 “SPI Input Data Bits” on Page 21) the oscillator

remains turned on.

Figure 6

State Diagram “SBC Sleep Mode”

Start Up

Power Up

SBC Standby Mode

Vcc

„single“ µController SPI -Command:

- select SBC Sleep Mode via SPI Mode Bits

- window watchdog activation / deactivation via SPI

[can remain active as periodic reset timer ]

SBC Active Mode

MS2

Vcc

MS1

MS0

0 / 1

transition caused by :

- event at MONx inputs

- LIN message

[SPI indicates source]

SBC Sleep Mode

MS2

OFF

Vcc

MS1

MS0

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