SM8230A Datasheet, PDF (2/7 Pages) Nippon Precision Circuits Inc – Tone Dialer with Built-in Piezo Driver

BLOCK DIAGRAM
SM8230A
SD
SCL
OE
CLK
VSS
Programmable
Counter
High Group
ROM
D/A
Converter
Output
Control
LATCH
SELECTOR
Programmable
Counter
Low Group
ROM
D/A
Converter
Output
Control
VDD
BZH
BZL
PIN DESCRIPTION
Number
1
2
Name
SD
SCL
3
OE
4
VSS
5
CLK
6
BZL
7
BZH
8
VDD
I/O
Description
I
Serial data input
I
Serial data transfer clock input.
(For valid transfer, OE must stay LOW for 16 clock cycles.)
I
DTMF output enable/serial data transfer select input.
Serial data transfer is selected when LOW.
–
Ground
I
System clock input. The clock can be set to one of four frequencies (480 kHz, 960
kHz, 1.92 MHz, 3.84 MHz).
O
DTMF low-frequency group analog output
O
DTMF high-frequency group analog output
–
Supply voltage
NIPPON PRECISION CIRCUITS—2