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SM8230A Folha de dados(PDF) 6 Page - Nippon Precision Circuits Inc

Nome de Peças SM8230A
Descrição Electrónicos  Tone Dialer with Built-in Piezo Driver
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Fabricante Electrônico  NPC [Nippon Precision Circuits Inc]
Página de início  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

SM8230A Folha de dados(HTML) 6 Page - Nippon Precision Circuits Inc

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SM8230A
NIPPON PRECISION CIRCUITS—6
Transfer Command Specifications
The transfer data code format is shown in figure 3.
Data is transferred with the MSB as the leading bit.
The data sets the input clock, high-frequency group
and low-frequency group frequencies, and the output
levels. The commands are shown in tables 1 to 4.
CK command (CK1, CK0)
These bits set the frequency of the input clock on
CLK. The frequency can be set to 1
×, 2×, 4×, and 8×
multiples of 480 kHz. The input code and the corre-
sponding clock frequency are shown in table 1.
Figure 3. Transfer command format
Table 1. CK command
C K 1
C K 0
CLK input clock frequency
0
0
480 kHz
0
1
960 kHz
1
0
1.92 MHz
1
1
3.84 MHz
0
0
CK1 CK0 FH1 FH0 GH3 GH2 GH1 GH0 FL1 FL0 GL3 GL2 GL1 GL0
Low group output level set.
Low group frequency set.
High group output level set.
High group frequency set.
CLK pin input frequency set.
b15(MSB)
b0(LSB)
Set (b14, b15) = (0, 0)
for normal operation.
FH/FL command (HF1, FH0 / FL1, FL0)
These bits set the DTMF signal high-frequency and
low-frequency group frequencies, respectively.
The input code, the corresponding group frequency
specification, the design value and frequency devia-
tion are shown in tables 2 and 3.
Note that the design value and frequency deviation
are calculated values assuming a deviation-free sys-
tem clock input on CLK.
Table 2. FH command
FH1
FH0
DTMF
frequency
(Hz)
Design
value (Hz)
D e viation
(%)
0
0
1209
1212.1
+0.26
0
1
1336
1333.3
−0.20
1
0
1477
1481.5
+0.30
1
1
1633
1632.7
−0.02
Table 3. FL command
FH1
FH0
DTMF
frequency
(Hz)
Design
value (Hz)
D e viation
(%)
0
0
697
697.7
+0.10
0
1
770
769.2
−0.10
1
0
852
851.1
−0.11
1
1
941
937.5
−0.37


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