TLE8262E datasheet(55/93 Pages) INFINEON

55 / 93 page

Data Sheet

Rev. 1.0, 2009-03-31

TLE8262E

Supervision Functions

11.1.4

Reset from Outside

If the reset pin RO is pulled to low from outside while no reset low is issued by the SBC, the device goes to Restart

Mode. In Restart Mode an reset is issued by the SBC, the RO pin is set to low for the time

RD1 or tRD2. If the RO

pin is pulled to low for longer time Reset clamped is detected.

11.2

Watchdog

Two different Watchdogs are possible in the SBC. It can be either a Window Watchdog or a Time-out Watchdog.

The Watchdog can also be inhibited in SBC Stop Mode and SBC SW Flash Mode via SPI. The Watchdog timing

is programmed via SPI command. As soon as the Watchdog is activated, the timer starts running and the

Watchdog must be served. Please refer to Table 10 to match the SBC Modes with the Watchdog Modes.

The default setting for the Watchdog is Time-out Watchdog with a 256 ms timer. The long open window allows the

microcontroller to run its initialization sequences and then to trigger the Watchdog via the SPI.

The Watchdog is served by a SPI bit and should toggle with the correct frequency. The default value is a 0, so the

first trigger bit must be a 1.

In case of a Watchdog reset, the Watchdog immediately starts with a long open window when entering SBC

Normal Mode. With the reset the watchdog bit is set to 0, so the first watchdog trigger after reset is a change to 1.

In SBC Software Development Mode, no reset is generated due to watchdog failure, if a watchdog failure occurs

it is indicated by the SPI Reset bit and via INT pin. All watchdog modes are accessible in regards to the normal

operation modes.

Table 10

Watchdog Functionality by SBC Modes

SBC Mode

Watchdog Mode

Remarks

INIT Mode

Watchdog Programmable;

Watchdog is not active.

INIT Mode should be left in less than 256 ms (see

Chapter 13)

Normal Mode

WD Programmable;

Time-out or Window Watchdog

–

Software Flash Mode

Mode is fixed

SBC retains the set-up as in the mode before entering

the Software Flash Mode

Stop Mode

Mode is fixed

SBC retains the set up as in the mode before entering

the Stop Mode

Sleep Mode

OFF

SBC does not retain the set-up.

Fail-Safe Mode

OFF

SBC does not retain the set-up

Restart Mode

OFF

SBC will start default Watchdog setting (256ms

Time-out Watchdog) when entering Normal Mode.

TLE8262E Datasheet(PDF) 55 Page - Infineon Technologies AG

TLE8262E Datasheet(HTML) 55 Page - Infineon Technologies AG

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93

Datasheet Download

Link URL