SM8230A
NIPPON PRECISION CIRCUITS INC.
Tone Dialer with Built-in Piezo Driver
PINOUT
OVERVIEW
The SM8230A is a dual-tone signal generator LSI
developed for DTMF (dual tone multi-frequency)
dialing. It features a built-in piezo-electric speaker
driver for direct connection to a piezo-electric
buzzer.
The DTMF frequencies can be set to correspond to
the DTMF standards of any country. The output level
is also adjustable under software control. These
features, combined with its small package and low
power dissipation, make the SM8230A a very use
device to use.
SD
SCL
OE
VSS
1
8
VDD
BZH
BZL
8230AS
4
5
CLK
PACKAGE DIMENSIONS
FEATURES
s
s
s
s
s
s
s
3-line serial interface to external CPU
2 independent, adjustable frequency outputs
Piezo driver for direct connection to a piezo-
electric buzzer
4 system clock frequencies selectable (480 kHz,
960 kHz, 1.92 MHz, 3.84 MHz)
2.6 to 3.3 V supply voltage
Low current consumption
• 3.0 mA (max) operating current
• 1 µA (max) standby current
8-pin plastic SOP
4.4 0.2
6.2 0.3
5.2 0.3
0.15
−
0.05
+
0.10
0.05 0.05
1.5 0.1
1.27
0.4 0.1
0 10
0.4 0.2
NIPPON PRECISION CIRCUITS—1
NPC [ NIPPON PRECISION CIRCUITS INC ]
