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SM8230A Scheda tecnica(PDF) 6 Page - NEC |
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SM8230A Scheda tecnica(HTML) 6 Page - NEC |
6 / 8 page SM8230A SEIKO NPC CORPORATION —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× multi- ples of 480kHz. The input code and the corresponding clock frequency are shown in table 1. 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 deviation are shown in tables 2 and 3. Note that the design value and frequency deviation are calculated values assuming a deviation- free system clock input on CLK. Figure 3. Transfer command format Table 1. CK command CK1 CK0 CLK input clock frequency 0 0 480kHz 0 1 960kHz 1 0 1.92MHz 1 1 3.84MHz Table 2. FH command FH1 FH0 DTMF frequency [Hz] Design value [Hz] Deviation [%] 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] Deviation [%] 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 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. |
Codice articolo simile - SM8230A_06 |
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Descrizione simile - SM8230A_06 |
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