TLE4299_07 datasheet(16/25 Pages) INFINEON | Low-Drop Fixed Voltage Regulator

Part No.	TLE4299

Description	Low-Drop Fixed Voltage Regulator

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Manufacturer	INFINEON [Infineon Technologies AG]

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Datasheet

16

Rev. 1.1, 2007-10-17

TLE 4299

Early Warning

The early warning function compares a voltage defined by the user to an internal

reference voltage. Therefore the supervised voltage has to be scaled down by an

external voltage divider in order to compare it to the internal sense threshold of typical

1.36 V. The sense output pin is set low, when the voltage at SI falls below this threshold.

A typical example where the circuit can be used is to supervise the input voltage

V

I to

give the microcontroller a prewarning of low battery condition.

Calculation to the voltage divider can be easily done since the sense input current can

be neglected.

Figure 9

Sense Timing Diagram

V

thHL = (RSI1 + RSI2)/RSI2 × VSI low

[4]

V

thLH = (RSI1 + RSI2)/RSI2 × VSI high

[5]

The sense in comparator uses a hysteresis of typical 90 mV. This hysteresis of the

supervised threshold is multiplied by the resistor dividers amplification (

R

SI1 + RSI2)/RSI1.

The sense in comparator can also be used for receiving data with a threshold of typical

1.36 V and a hysteresis of 90 mV. Of course also the data signal can be scaled down

with a resistive divider as shown above. With a typical delay time of 2.5

µs for positive

transitions and 2.4

µs for negative transitions receiving data of up to 100 kBaud are

possible. The sense output is an open collector output.

t

Sense

t

SI, High

V

SI, Low

V

Input

Voltage

High

Low

Output

Sense

t PD SO LH

PD SO HL

t

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