參數(shù)資料
型號： UPD178024GC-051
廠商： NEC Corp.
元件分類： 通用總線功能
英文描述： 8-BIT SINGLE-CHIP MICROCONTROLLER WITH ON-CHIP PRESCALER, PLL FREQUENCY SYNTHESIZER, AND IF COUNTER FOR AUTOMOTIVE FM/MW/LW RADIO WITH CD PLAYER
中文描述： 8位單片機具有片上標器，鎖相環(huán)頻率合成器，如柜臺，汽車調頻/中波/龍運收音機帶CD播放器
文件頁數(shù)： 6/98頁
文件大?。?/td> 467K
代理商： UPD178024GC-051
Data Sheet U14608EJ1V0DS00
6
μ
PD178024GC-051
Pin No.
Symbol
Pin Name
Description
I/O Type
This pin inputs an analog signal indicating the audio level in each
audio frequency band from a bandpass filter IC (BA3835F).
Connect this pin to the AOUT pin (pin 17) of the bandpass filter IC
(BA3835F) and input an analog signal to the device in accordance
with a given audio level.
This pin is used to identify the audio level in each audio frequency
band to be displayed by the spectrum analyzer.
The audio level varies, depending on the input voltage, as follows,
regardless of the audio frequency band:
Input voltage (V
DD
= 5.0 V)
Audio Level
239.5
÷
256
×
V
DD
or more (4.7 V or more)
10
Less than 239.5
÷
256
×
V
DD
(less than 4.7 V)
219.5
÷
256
×
V
DD
or more (4.3 V or more)
9
Less than 219.5
÷
256
×
V
DD
(less than 4.3 V)
199.5
÷
256
×
V
DD
or more (3.9 V or more)
8
Less than 199.5
÷
256
×
V
DD
(less than 3.9 V)
179.5
÷
256
×
V
DD
or more (3.5 V or more)
7
Less than 179.5
÷
256
×
V
DD
(less than 3.5 V)
149.5
÷
256
×
V
DD
or more (2.9 V or more)
6
Less than 149.5
÷
256
×
V
DD
(less than 2.9 V)
119.5
÷
256
×
V
DD
or more (2.3 V or more)
5
Less than 119.5
÷
256
×
V
DD
(less than 2.3 V)
89.5
÷
256
×
V
DD
or more (1.7 V or more)
4
Less than 89.5
÷
256
×
V
DD
(less than 1.7 V)
59.5
÷
256
×
V
DD
or more (1.1 V or more)
3
Less than 59.5
÷
256
×
V
DD
(less than 1.1 V)
29.5
÷
256
×
V
DD
or more (0.6 V or more)
2
Less than 29.5
÷
256
×
V
DD
(less than 0.6 V)
4.5
÷
256
×
V
DD
or more (0.1 V or more)
1
Less than 4.5
÷
256
×
V
DD
(less than 0.1 V)
0
5
SPEC IN
Spectrum analyzer
signal input
For spectrum analyzer display, refer to “6. LCD PANEL”.
Analog
input
This pin inputs a signal meter signal from a tuner pack.
Input an analog signal in accordance with the intensity of the
received electric field to this pin.
This pin is used to detect a broadcasting station during auto tuning
of the radio.
A station is detected by the signal meter signal as follows,
depending on the input voltage but regardless of the received band
and received sensitivity (local/DX):
Input Voltage (V
DD
= 5.0 V)
Station
Detection
128.5
÷
256
×
V
DD
or more (2.49 V or more)
Station
detected
Less than 128.5
÷
256
×
V
DD
(less than 2.49 V)
Station not
detected
6
SM
Signal meter signal
input
For station detection, refer to “3.4 Station Detection”.
Analog
input
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