NJU7505XD Просмотр технического описания (PDF) - Japan Radio Corporation
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NJU7505XD Datasheet PDF : 9 Pages
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NJU7505
! 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.
A IN
OSC1
A/D
CONVERTER
NJU7505 OSC2
fOS C
AOUT
RST /CLK O
VSS
RD
µ COM
A OUT
RD
RST
f1
f1
f2
f2
3*214 / fOSC
f3
f5
f1
f3
f5
f1
f2
f4
f3
f1
f2
f4
f3
f1
f1
f2
f3
f2
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;
A OUT
RD
Available Period
of Read-out
248 / fosc
8 / fosc
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.
A OUT
fn
f1
4/ fosc[MIN] 52/ f osc
RST
Ver.2004-06-04
-3-
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