AS2702 – AS-Interface Slave IC

Revision 1.3, 21-Aug-08

Page 2 of 13

Block Diagram

LTGP

LTGN

UOUT

CDC

U5R

OSC2

OSC1

OSCIL-

LATOR

RECEIVE

TRANSMIT

JABBER

INHIBIT

U5R

U5R

U5R

U5R

V

THERMO-

DETECTOR

+

-

+

-

BANDGAP

POR

TRIMMING

U5R

16 x 8 BIT

11

IMP_POS

IMP_NEG

RESET

threshold

4

4

LOGIC BLOCK

Figure 1

Block diagram

Pin Assignment and Description

SOIC 20

SOIC 16

Name

Type

Note

Description

Pin No.

Pin No.

1

-

P1

I/O, digital, pull-up 1, 2

Bidir. parameter port bit 1

2

-

P0

I/O, digital, pull-up 1, 2

Bidir. parameter port bit 0

3

1

D1

I/O, digital

Bidir. data port bit 1

4

2

D0

I/O, digital

Bidir. data port bit 0

5

3

DSTBn

I/O, digital, pull-up 1

Data port strobe output; reset-input

6

4

LED1

I/O, digital, pull-up 1

LED output 1 (IC test input)

7

5

OSC2

O, analog

Output to quartz crystal

8

6

OSC1

I, analog

Input from quartz crystal

9

7

U5R

O, power

Nom. 5V power supply output

10

8

LTGN

I, power

Neg. supply pin, connected to neg. AS-Interface bus line,

ground reference

11

9

LTGP

I, power

Pos. supply pin, connected to pos. AS-Interface bus line

12

10

CDC

I/O, analog

Pin for ext. buffer capacitor

13

11

UOUT

O, power

Nom. 24V power supply output