w91082n Winbond Electronics Corp America, w91082n Datasheet - Page 2

• Manufacturer Part Number: w91082n
• Description: Tone Generator With Uc Serial Interface
• Manufacturer: Winbond Electronics Corp America

BLOCK DIAGRAM
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.
codes and the tone output frequency is shown in Table1. The control timing waveform is shown in
Figure 1.
DTMF
DATA
OSC.
CLK
CE
DATA
CLK
XT1
XT1
D0
T
Digit1
OSC
Figure 1. Serial interface control timing waveform
D4
Serial Data
Shift Register
System Clock
Digit1 DTMF Signal
CE
D0
Digit2
- 2 -
D4
Control Circuit
Tone Generator
Preliminary W91082N
Digit2 DTMF Signal
The relationship between the digital
D0
Stop Code
DTMF
D4