W91082N Datasheet, PDF (2/5 Pages) Winbond – TONE GENERATOR WITH uC SERIAL INTERFACE

Preliminary W91082N
BLOCK DIAGRAM
XT1
XT1
DATA
CLK
CE
System Clock
Tone Generator
DTMF
Serial Data
Shift Register
Control Circuit
FUNCTIONAL DESCRIPTION
The W91082N is a Tone generator with µC serial interface.
When chip enable ( CE pin goes to low level), the DATA and CLK pins receive the correspondent
code to generate a DTMF signal.
The W91082N defines every digit to have 5 bits code, and D0 (LSB) as the first received bit. The
W91082N latches the data on the falling edge of the clock.
The relationship between the digital
codes and the tone output frequency is shown in Table1. The control timing waveform is shown in
Figure 1.
OSC.
CE
CLK
DATA
T_OSC
D0
D4
Digit1
D0
D4
Digit2
D0
D4
Stop Code
DTMF
Digit1 DTMF Signal
Digit2 DTMF Signal
Figure 1. Serial interface control timing waveform
-2-