HCS500

DS40153B-page 22

Preliminary

© 1997 Microchip Technology Inc.

8.1.7

ERASE ALL COMMAND

8.1.8

PROGRAMMING COMMAND

FIGURE 8-2:

TYPICAL MICROCONTROLLER INTERFACE CIRCUIT

Standard Operating Conditions (unless otherwise specified):

Commercial (C):

0

°C ≤ TA ≤ +70°C

Industrial (I):

-40

°C ≤ TA ≤ +85°C

Symbol

Parameters

Min

Typ

Max

Units

Learn command activation time

20

—

1000

µs

Decoder acknowledge time

20

—

210

ms

Microcontroller acknowledge

response time

20

—

1000

µs

Decoder data line low

—

—

10

µs

Standard Operating Conditions (unless otherwise specified):

Commercial (C):

0

°C ≤ TA ≤ +70°C

Industrial (I):

-40

°C ≤ TA ≤ +85°C

Symbol

Parameters

Min

Typ

Max

Units

Command request time

—

—

500

ms

Decoder acknowledge time

—

—

1

ms

Start command mode to first

command bit

20

—

1000

µs

Data line low before tri-stated

—

—

5

µs

Clock high time

20

—

1000

µs

Clock low time

20

—

1000

µs

Clock frequency

500

—

25000

Hz

Data hold time

—

—

5

µs

Command validate time

—

—

10

µs

Command acknowledge time

30

—

240

ms

Acknowledge respond time

20

—

1000

µs

Data low after clock low

—

—

10

µs

1K

A0

1

A1

2

A2

3

4

SDA 5

SCL 6

WP 7

U2

24LC02B

1

EECLK

2

EEDAT

3

MCLR

4

SDAT 5

SCLK 6

RFIN 7

8

U1

HCS500

R3

10K

VI

G

N

D

VO

U3

POWER SUPPLY

X

X

X

RF

Receiver

Microcontroller

SUPERVISOR 4.5V

RST

In-circuit

Programming

Probe Pads

Note:

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

strongly recommended.