DS2406

18 of 30

DS2406 EQUIVALENT CIRCUIT Figure 11

1-Wire Interface

PIO

Ground

PIO Channel

Reset

D

"1"

Q

Q

Activity

Latch

DQ

Q

1-Wire DATA

Channel

Flip-Flop

to PIO-

Control

10 M

Ω

Typ.

from PIO-

Control

R

Edge

Detector

DATA

RX

TX

100

Ω

MOSFET

Ground

5 µA

Typ.

BUS MASTER CIRCUIT Figure 12

A) Open Drain

12V

Open Drain

Port Pin

S

D

D

S

470 pF

D

S

PGM

D

S

2N7000

2N7000

2N7000

VP0300L

OR

VP0106N3

OR

BSS110

Capacitor added to reduce

coupling on data line due to

programming signal switching

VPUP

RX

TX

B) Standard TTL

TTL-Equivalent

Port Pins

5 k

Ω

12V

(10 mA min.)

to data connection

of DS2406

PROGRAMMING PULSE

The diode and programming circuit are not required if one does not intend to program the EPROM cells

VPUP

RX

TX

DD

V

5 k

Ω

to data connection

of DS2406

DD

V

DS5000 OR 8051-

EQUIVALENT

5 k

Ω

10 k

Ω

10 k

Ω

BUS MASTER

BUS MASTER

The interface is reduced to the

pull-up resistor if one does not intend to program the EPROM cells.

5k

Ω