TLE7263E datasheet(9/63 Pages) INFINEON

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TLE 7263E

Features

Data Sheet

Rev. 1.51, 2007-06-22

4.1

Operation Modes

This System Basis Chip (SBC) offers five main operation modes that are controlled via

three mode select bits MS1, MS2 and MS3 within the SPI: SBC Active, Standby, Sleep

and Stop mode, as well as CAN Receive-Only mode. After powering-up the SBC, it

starts-up in SBC Standby Mode, waiting for the microcontroller to finish its startup and

initialization sequences. From this transition mode the SBC can be switched via SPI

command into the desired operating mode (The device should not be switched directly

from Standby Mode to Sleep or Stop Mode). All modes are selected via SPI bits or

certain operation conditions, e.g. external wake-up events.

The SBC Active Mode, that is used in order to transmit and receive CAN and LIN

messages, supports two additional sub-modes, “CAN Sleep” and “LIN Sleep”. During

these sub-modes the SBC remains its voltage regulators running in order to supply

external devices. Also, the line termination of the “sleeping” bus transceiver is turned-off

respectively.

During SBC Sleep Mode, the lowest power consumption is achieved, by having its main

voltage regulator switched-off. As the microcontroller can not be supplied, the integrated

window watchdog might be disabled in Sleep Mode via SPI bit. However, it can be

turned-on for periodically waking-up the system, e.g. ECU, by generating a reset.

In case an external microcontroller needs to be supplied with its quiescent current, the

SBC Stop Mode can be chosen. In this mode the main voltage regulator remains active.

Optionally, the second voltage regulator can be turned-on or off via the SPI prior to

entering one of the respective power saving modes. The integrated window watchdog

remains active until the microcontroller enters its power saving mode (“Stop Mode”). This

power saving mode is assumed to be reached once the current consumption is below a

certain threshold (see Watchdog current threshold, Table and “Window Watchdog,

Reset” on Page 26).

In both low power modes the internal bus transceivers, including the line termination, are

turned off while the wake-up capabilities via bus message or monitoring pins are still

active. The SBC offers Sleep and Stop Mode in conjunction with or without the Cyclic

Sense/Wake feature. If the Cyclic Sense/Wake feature is selected, two possible states

can be entered during Sleep/Stop Mode: HS-On and HS-Off (see text and respective

state diagram).

The Cyclic Sense feature can be used to supply an external wake-up circuitry

periodically, and is entered upon activation via SPI command. In cyclic sense HS-On

state, the High-Side switch is activated for a certain “on-time” and provides supply

voltage at its OUTHS pin. Within this on-time the SBC starts sampling of the

monitoring/wake-up lines. On-time as well as time period are programmable via the SPI

control word. A wake-up at the monitoring / wake-up pins during the on-time as well as

a message at the CAN or LIN bus lines automatically sets the TLE 7263E into SBC

Standby mode, and turns-on the main voltage regulator

CC1. The digital RxDCAN/RxDLIN

lines, that are monitored by the microcontroller during power saving, are pulled low with

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