TLS820F0 datasheet(31/41 Pages) INFINEON

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TLS820F0

Block Description and Electrical Characteristics

Data Sheet

Rev. 1.1, 2015-07-27

Watchdog Trigger Time

Two pins, DT1 and DT2, are used to set the desired Watchdog Trigger Time

WI,tr. Connect these pins either to

GND or to high level (e.g. Q) to select the timing according to Table 11.

Watchdog deactivation by current control

The Watchdog is load dependent inactive. This ensures, that if the microcontroller is in a power save mode

(

Q ≤ IQ,W,deact) and not able to provide a correct watchdog trigger signal at pin “WI”, no watchdog signal “WO = low”

is generated. The transition from an active to an inactive state will be performed after a dead time of

W,IQ,filter,max,

when output current keeps below the deactivation threshold. This protects against an unintended entering of the

watchdog deactivation state caused by short dynamic current drops. In case of very short current drops up to the

time of

W,IQ,filter,min, the activation state will definitely be kept. These scenarios are also valid for the transition from

deactivation to activation state. For details see also Figure 11

Watchdog Output Low Voltage

WO,low

–0.2

0.4

WO >5.1 kΩ

P_5.9.34

Watchdog Output

Internal Pull-Up Resistor

WO,int

kΩ

internally connected to pin

P_5.9.35

Watchdog Output External

Pull-up Resistor to

WO,ext

5.1

–

kΩ

WO ≤ 0.4 V;

P_5.9.36

1) Not subject to production test, specified by design.

2) For details on applied test pulse, see Figure 10

3) Not subject to production test, specified by design.

Table 11

Watchdog Trigger Time Selection

DT1 connected to

DT2 connected to

WI,tr,typ

GND

96 ms

QGND

48 ms

GND

32 ms

16 ms

Table 10

Electrical Characteristics Watchdog (cont’d)

j = -40 °C to +150 °C, VI = 13.5 V, all voltages with respect to ground (unless otherwise specified)

Typical values are given at

j = 25 °C

Parameter

Symbol

Values

Unit Note / Test Condition

Number

Min. Typ. Max.

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