參數(shù)資料
型號： LC72323-XXXX
元件分類： 消費家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP80
封裝： QFP-80
文件頁數(shù)： 26/27頁
文件大?。?/td> 457K
代理商： LC72323-XXXX
No. 4934-8/27
LC72323-XXXX
Ports
Note: * See the item on double function key beep output.
Pin
Name
I/O
Allocation
Active
Function
Handling when unused
1
XIN
I
XIN
—
2
TEST2
I
TEST2
—
3
PG3
I
SK
H
Connect directly to
ground.
Connect directly to
4
PG2
I
DK
H
ground.
5
PG1
I
/SD
L
Must be used.
6
PG0
I
/ST
L
Connect directly to
VDD.
7
PH3
O
BEEP
H
Open
8
PH2
O
BAND2
H
Open
9
PH1
O
BAND1
H
Open
10
PH0
O
/POWER
L
Connect directly to
ground.
11
PF3
O
LOCAL
H
Open
12
PF2
O
STEREO
H
Open
13
PF1
I
/TAPE
L
Connect directly to
VDD.
14
PF0
I
TAPE RUN
—
Connect directly to
ground.
15
PE3
O
DOLBY
H
Open
16
PE2
O
METAL
H
Open
17
PE1
O
APSS
H
Open
18
PE0
O
LOUDNESS
H
Open
19
PD3
O
/AMUTE
L
Open
20
PD2
O
LEDFL
H
Open
21
PD1
O
DI/KS9
H
22
PD0
O
CLK/KS8
H
23
PC3
O
CE/KS7
H
Open
24
PC2
O
KS6
H
25
PC1
O
KS5
H
26 to
PC0 to
O
KS4 to KS0
H
Open
30
PB0
32 to
PA3 to
I
K3 to K0
H
Connect directly to
35
PA0
ground.
36 to
S28 to
O
S28 to
H
Open
63
S1
Connection for the 4.5 MHz crystal
Connect to ground
High: “SK” display on, low: “SK” display off
In bands other than the FM band, the SK display is always off
regardless of whether this pin is high or low.
An SK high search starts when the VF key is pressed. When an SD
present state is detected, the circuit checks again after between 375
and 500 ms, and if the signal is high, it holds that frequency. After
that, if a low level continues for 25 seconds, an auto retune operation
starts. (sampling = 25 ms)
In VF mode and in either tape or CD mode, if a high level is input to
this signal (if a high level is detected three times in a row at 25 ms
intervals), the circuit switches to radio mode, and ARI broadcast
reception becomes possible. Also, after a VF key on and an SK seek,
DK is checked 2 s after an SK present state is recognized.
Output signal that reports station reception during auto tuning.
Low: “STEREO” display on, high: “STEREO” display off
the STEREO display is turned off in bands other than the FM band
regardless of the high or low state of this pin.
Monitors all keys and outputs a 50 ms 3 kHz pulse when any key is
pressed. (A pull-up resistor is required.)*
These pin outputs change according to the table when either the
BAND or VF key is pressed. (A pulll-up resistor is required.)
Outputs a low level in power on mode, high in power off mode.
(A pull-up resistor is required.)
Outputs a low level in normal mode. Outputs a high level when the
DX display is turned off in seek and scan modes.
The output is inverted when the stereo key is pressed in the FM band.
Detects a tape input.
The “
” indicator lights when high and the “
” indicator lights
when low.
High indicates that the Dolby indicator is on (only in tape mode) and a
low indicates that the Dolby indicator is off.
High indicates that the metal indicator is on (only in tape mode) and a
low indicates that the metal indicator is off.
High indicates that the “APSS” indicator is on (only in tape mode) and
a low indicates that the “APSS” indicator is off.
High indicates that the loudness indicator is on and a low indicates
that the loudness indicator is off.
Audio mute output
The LEDs flash when /HOLD is low. (When LEDSEL is 0.)
Connect to the LC75371M DI pin.
Connect to the LC75371M CLK pin.
Connect to the LC75371M CE pin.
Diode matrix source output
Key matrix source output
Key & diode matrix return input
LCD segment output
BAND1
BAND2
VF
H
FM
H
L
MW
L
LW
L
H
Continued on next page.
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