55
No. Symbol
I/O Explain
1 AMANT
I
AM antenna input
AM antenna input high impedance AMANT pin is connected with
an all antenna by way of 4.7
µ
H. (LAU type inductor) A series circuit
including an inductor and a resistor is connected with RF ground for
the countermeasure against the ham of power transmission line.
2 RFGND
RF ground
Ground of antenna block
3 FMANT
I
FM antenna input
Input of FM antenna 75
Ω
Surge absorber
(DSP-201M-S00B)
is necessary.
4 VCC
power supply
The power supply for analog block. D.C 8.4V
±
0.3V
5 SL
O
signal level
Output of FM/AM signals level
6 CE2
I
chip enable-2
Chip enable for EEPROM ”Low” active
7 WC
I
write control
You can write EEPROM, when EEPROM write control is “Low”.
Ordinary non connection
8 CE1
I
chip enable-1
Chip enable for AF•RF ”High” active
9 CK
I
clock
Clock
Data input
Not used
Ground of oscillator block
Power supply for EEPROM pin 13 is connected with a power supply of
micro computer.
Data output
Ground of digital block
Not used
The power supply for digital block. 3.3V
±
0.2V
Not used
Not used
Not used
21 NC
non connection
Not used
22 AUDIOGND
audio ground
Ground of audio block
23 L ch
O
L channel output
FM stereo “L-ch” signal output or AM audio output
24 R ch
O
R channel output
FM stereo “R-ch” signal output or AM audio output
FMRF
ANT adj
RF adj
FM ANT
T51
CF52
CF51
RFGND
OSCGND
DGND
AUDIOGND
NC
VCC
VDD_3.3
3.3V
2.5V
IC 4
3.3V
2.5V
←
IC 2
2.5V
WC
CE2
ROM_VDD
SL
DI
CK
CE1
NC
DO
NC
NC
NC
NC
7 6
13
5
10 9 8
11
14
18 19
20
21
1
3
2
12
15
22
16
4
17
IC 1
3.3V
AM ANT
FMRF
ATT
LPF
OSC
IC 3 EEPROM
5.0V
IC 5
5V
3.3V
←
ATT
MIXER, IF AMP
DET, FM MPX
24
23
Rch
Lch
-
FM/AM Tuner Unit
5
7
8
F
E
D
C
B
A
5
7
8
DEH-P250/XM/UC
www. xiaoyu163. com
QQ 376315150
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