SM8230A_06 Datasheet, PDF (2/8 Pages) NEC – 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 (480kHz,
960kHz, 1.92MHz, 3.84MHz).
O
DTMF low-frequency group analog output
O
DTMF high-frequency group analog output
–
Supply voltage
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