3

Data Sheet

AS2590

Rev. 1

Dec. 1993

Pin Description Continued

DIL

PLCC

Symbol

Function

42

45

SDA

Serial data line input to dialler/controller

43

47

SCL

Clock line input of serial data link

44

48

V

BIAS

Oscillator bias input, recommended bias resistor 2.2 M

Ω

45

49

XTAL1

Oscillator pins for 32.768 kHz crystal, a resistor and two capacitors

46

50

XTAL2

47

51

MS

Mode select input:

MS = V

MS = V

48

52

V

DD

Positive supply pin

Digit Description

Segment

ABC

D

E

F

G

0

numbers

on on on on on on

1

0…9

on on

2

onon

onon

on

3

onon onon

on

4

onon

onon

5on

on on

on on

6

on

onononon on

7on on on

8

onon onononon on

9

on onon

onon

a

letter A

on on on

on

b

letter B

on on on on on

c

letter C

on on

on

d

Letter D

on on on on

on

_

underscore

on

*

asterisk

on on

on on

#

hash

on

on on on

on

-

pause

on

P/T

temp. MF

on

on

on

r

recall

on

on

LCD Layout

A

G

D

B

C

F

E

Figure 2

D

0

D

1

D

2

D

3

D

4

D

5

D

6

D

7

D

8

D

9

D

10

D

11

D

12

D

13

D

14

D

15

D

16

D

17

SB3

SB5

SB4

SB2

SB0

SB1

Figure 1

Table 1 Segments Digits

SB0 = loudspeaker on (blinking with 1 Hz)

SB1 = microphone muted (blinking with 1 Hz)

SB2 = 2nd key function enabled

SB3 = number stored

SB4 = number buffered in FIFO, not stored

SB5 = colon for clock and timer (blinking when clock is

shown)