U2270B Просмотр технического описания (PDF) - Atmel Corporation

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U2270B

Read/Write Base Station

Atmel Corporation 

Figure 3-7. Equivalent Circuit of Pin HIPASS

R

+

-

LPF

R

VRef

R

R

Ri

HIPASS

CHP

Schmitt

trigger

3.6 Schmitt Trigger

The signal is processed by a Schmitt trigger to suppress possible noise and to make the signal

microcontroller-compatible. The hysteresis level is 100 mV symmetrically to the DC operation

point. The open-collector output is enabled by a low level at OE (pin 3).

Figure 3-8. Equivalent Circuit of Pin OE

7 µA

OE

8 U2270B

4684E–RFID–02/08

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