Conditioning the signal

AN4368

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DocID025334 Rev 1

the global signal conditioning chain can be plugged directly to a microcontroller input and

consequently, we can trigger an alarm, switch on a light, etc

Figure 11: Output voltage of the comparator stage

Note that an initialization time has to be taken into consideration to detect movement. This

is due to the warm up time of the sensor and the charge of the capacitors. This means that

a "blank" time has to be taken into account at microcontroller level.

Table 2 below shows the key parameters of the products (TSU10x and TS33x) used in this

application.

Table 2: Key parameters of the products TSU10x and TS33x

Features

TSU10x

(op amp)

TS33x

(open-drain comparator)

Vcc range

1.5 V

– 5.5 V

1.6 V

– 5 V

Number of channels

Available in single, dual, and quad versions

Icc (typ)

0.6 µA

23 µA

AC performance

Bandwidth 8 kHz

Propogation delay:

- 270 ns (high to low)

- 450 ns (low to high)

Vio (max)

3 mV

5 mV