Instrukcja obsługi Microchip HCS473

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 2001-2011 Microchip Technology Inc.Preliminary DS41163E-page 1

1.0PROGRAMMING THE HCS473

HCS473 devices are programmed using a serial

method that differs from previous KEELOQ®encoders.

This Serial mode will still allow the HCS473 to be pro-

grammed while in the users system (ICSP™). This

allows for great design flexibility. This programming

specification applies to HCS473 devices in all pack-

ages.

1.1Hardware Requirements

The HCS473 requires one programmable power sup-

ply for VDD (4.5V to 5.5V) and a VPP of 9V to 14V. Both

supplies should have a minimum resolution of 0.25V.

FIGURE 1-1:HCS473 DIAGRAM

TABLE 1-1:PROGRAMMING PIN DESCRIPTION

PDIP, SOIC, TSSOP

HCS473

S0

S1

S2

S3

VDDT

LCX

LCY

VDD

LED

OUTPUT

VSS

VSST

LCCOM

LCZ

1

2

3

4

5

6

7

14

13

12

11

10

9

8

Pin NameFunctionHCS473Pin TypePin Description

S0DATA1I/OData Input Output

S1CLOCK2IClock Input

LED VPP 13P(*)Program mode select

VSS SSV11P Ground

V VDD DD14P Power supply

Legend: I = Input, O = Output, P = Power

Note: In the HCS473, the programming high voltage is internally generated. To activate the Programming mode,

high voltage needs to be applied to LED input. This is used as a level source, meaning that LED does not

draw any significant current.

HCS473

HCS473 Programming Specication

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