HCS500 데이터 시트보기 (PDF) - Microchip Technology

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HCS500

KEELOQ Code Hopping Decoder

Microchip Technology 

HCS500

8.1.7 ERASE ALL COMMAND

Symbol

TERA

TACK

TRESP

TACK2

Parameters

Learn command activation time

Decoder acknowledge time

Microcontroller acknowledge

response time

Decoder data line low

8.1.8 PROGRAMMING COMMAND

Symbol

TPP1

TPP2

TPP3

TPP4

TCLKH

TCLKL

FCLK

TDS

TCMD

TACK

TWT2

TALW

Parameters

Command request time

Decoder acknowledge time

Start command mode to first

command bit

Data line low before tri-stated

Clock high time

Clock low time

Clock frequency

Data hold time

Command validate time

Command acknowledge time

Acknowledge respond time

Data low after clock low

Standard Operating Conditions (unless otherwise specified):

Commercial (C): 0°C ≤ TA ≤ +70°C

Industrial (I):

-40°C ≤ TA ≤ +85°C

Min

Typ

Max

Units

20

—

1000

µs

20

—

210

ms

20

—

1000

µs

—

—

10

µs

Standard Operating Conditions (unless otherwise specified):

Commercial (C): 0°C ≤ TA ≤ +70°C

Industrial (I):

-40°C ≤ TA ≤ +85°C

Min

Typ

Max

Units

—

—

500

ms

—

—

1

ms

20

—

1000

µs

—

—

5

µs

20

—

1000

µs

20

—

1000

µs

500

—

25000

Hz

—

—

5

µs

—

—

10

µs

30

—

240

ms

20

—

1000

µs

—

—

10

µs

FIGURE 8-2: TYPICAL MICROCONTROLLER INTERFACE CIRCUIT

VCC

RF

Receiver

U2

XXX4123

A0

A1

A2

VSS

VCC

WP

SCL

SDA

8

7

6

5

24LC02B

1K

1

2

3

4

U1

VDD

EECLK

EEDAT

MCLR

VSS

RFIN

SCLK

SDAT

8

7

6

5

HCS500

RST

R3

10K

Microcontroller

VCC

U3

POWER SUPPLY

SUPERVISOR 4.5V

VI G VO

N

D

In-circuit

Programming

Probe Pads

Note: Because each HCS500 is individually matched to its EEPROM, in-circuit programming is

strongly recommended.

DS40153B-page 22

Preliminary

© 1997 Microchip Technology Inc.

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