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NJU7505 数据表(PDF) 3 Page - New Japan Radio |
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NJU7505 数据表(HTML) 3 Page - New Japan Radio |
3 / 9 page NJU7505 -3 - Ver.2004-06-04 ! FUNCTIONAL DESCRIPTION # Interface to external controller The example of the interface between the NJU7505 and the external controller is shown below; (1) Example of the interface to the external controller ( Using the single ) After the RST signal from the external controller is input and then the internal circuit is initialized, each band data is output as shown below timing chart; Since the RD signal is output before each band is switched, the external controller is to count the number of the RD signal and is to recognize the status of the band and is to read the output data from the AOUT terminal through the external A/D converter. The output type of the external controller connected to the RST/CLKO terminal as the RST input should be the N-channel and open-drain type or the diode should be connected between the RST/CLKO terminal and the output terminal of the external controller, so that the voltage of the RST/CLKO terminal is not gotten over the VSS level. Since the RD signal is output before 248/fOSC of each band switched, the output data should be read out within the limited time as shown right; If the RST signal which pulse width is more than 4/fOSC is input, the internal circuit is initialized and the data of f1 band is output from the AOUT terminal after 52/fOSC of the rise edge of the RST signal. NJU7505 AIN AOUT OSC1 OSC2 fOSC VSS RD A / D CONVERTER RST /CLKO µ COM A OUT RD RST f1 f2 f3 f5 f1 f2 f4 f3 f1 f1 f2 f3 f1 f2 f3 f5 f1 f2 f4 f3 f1 f2 3*2 / fOSC 14 AOUT 248 / fosc RD 8 / fosc Available Period of Read-out AOUT fn RST 4/ fosc[MIN] 52/ f osc f1 |
类似零件编号 - NJU7505 |
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类似说明 - NJU7505 |
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