Data Sheet AS2533-36

Pin Description

Pin #

Symbol

Function

4

Positive Voltage Supply

This is the supply pin for the circuit.

5

This is the analogue ground for the amplifiers.

6

STB

This is the input for side tone cancellation.

7

CI

For complex impedance a capacitor should be connected to

8

MO

PDM output of the melody generator for tone ringing with internal open-drain transistor.

Hi-Z when not active.

9

LLC

Select pin for line loss compensation (see also Figure 6 and Figure 7).

10

HS/DP

This is an I/O that is pulled high by the hook switch when off-hook and an open drain pulls it low

during break periods of pulse dialing and flash.

11

OSC

Pin for ceramic resonator (3.58 MHz).

Reference:

Murata CSTCC3M58GD3346-R0

SMD

Murata CSTLS3M58GD3458-B0

Lead

12

MODE

Signaling

Mode pin

Function

Open

Dialing inhibited

Row 1

LD mode, 10 pps, 33/66 ms

Row 2

LD mode, 10 pps, 40/60 ms

Row 3

LD mode, 20 pps, 33/66 ms

Row 4

LD mode, 20 pps, 40/60 ms

Row 5

LD mode, 10 pps, 33/66 ms, Temp. MF with tone on first * key entry

Row 61

MF only, 82/82 ms

Row 7

MF only, 82/160 ms

During temporary MF: 82/160 ms

13

14

15

16

C4

C3

C2

C1

Keyboard Columns

(see key arrangements in Figure 2, Figure 3 and Figure 4)

Revision 8.8

Page 2 of 25