HCS473 datasheet(9/68 Pages) MICROCHIP

9 / 68 page

 2002 Microchip Technology Inc.

Preliminary

DS40035C-page 7

HCS473

FIGURE 2-6:

LED PIN DIAGRAM

FIGURE 2-7:

LCCOM/LCX/LCY/LCZ/

VSST PIN DIAGRAM

2.3

Architectural Overview

2.3.1

WAKE-UP LOGIC

The HCS473 automatically goes into a low-power

Standby mode once connected to a supply voltage.

Power is supplied to the minimum circuitry required to

detect a wake-up condition; button activation or LC sig-

nal detection.

The HCS473 will wake from Low-power mode when a

button input is pulled high or a signal is detected on a

LC low frequency antenna input pin. Waking involves

powering the main logic circuitry that controls device

operation. The button and transponder inputs are then

sampled to determine which input activated the device.

A button input activation places the device into Encoder

mode. A signal detected on the transponder input

places the device into Transponder mode. Encoder

mode has priority over Transponder mode such that

communication on the transponder input would be

ignored or perhaps interrupted if it occurred simulta-

neously to a button activation; ignored until the button

input is released.

2.3.2

ENCODER INTERFACE

Using the four button inputs, up to 15 unique control

codes may be transmitted.

LED

Detect

Program

Weak

LED

Mode

LCX/LCY/

LCZ Inputs

RECTIFIER and

REGULATOR

SST

10V

100

Ω

Input

AMP

DET

and

DAMP

LCX

only

10V

100

Ω

BIAS

CURRENT

LCCOM

CLAMP

RDAMP

Note:

S3 may not be used as a button input if the

RFEN option is enabled.

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