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KRC-754 D/L
CIRCUIT DESCRIPTION
4-3. Panel/main body connection
terminals
Pin Name | 1/0 |} Port Name
Function
0 | LCD _CEl
LCD Driver CE 1 (SANYO LC-7582)
0 | LCD_CE2
LCD driver CD 2 (sanyo LC-7582).
KRC-754DL is not used.
I
GND
GND
0
ILL-A
Illumination
(amber) output.
Power output to the front panel.
0
ILL-G
Illumination
(green) output.
Power output to the front panel.
I
SMALL
Car small
light SW detection
input.
I
D_GND
Digital
grounding.
O | LCDDATA
LCD driver serial data output (Sanyo LC-7582).
8
Key input for use by ADC.
(Resistance
type potential
division
Key4
to 4 CH)
LCD_CLK
LCD driver serial clock output (Sanyo LC-7582).
9
Key input for use by ADC.
(Resistance
type potential
division
KEY3
to 4 CH)
r
Key input for use by ADC.
(Resistance
type potential
division
10
KEY2
to 5 cH)
[ f o
fang
aT
to 5 CH)
i
"1 [Porer [Power St Gwviteh incorporating rotary encoder).
E
[0 [tco-nir [op inhibit output Gono
Lowe).
i
FT [xe-A [Rotary enewler input A for electronic volume cmtrol.
15
PT] ENG-A
Rotary encoder input B for electronic volume control.
* The pin Nos.
are assigned
so that,
with the front panel
facing toward the front,
the pin at the
top is pin 1.
5.
Key description
5-1. Key matrix
Utilizing
the ADC inputs,
five kinds of inputs are available
for each key according
to the
input voltages
supplied as shown in the circuit diagram below.
KEY]
KEY2
KEY3
KEY4
S¥1
SOURCE
(N.C)
CLK
@/SCN
SW2
ATT
LOUD/TLLUM
@/DOLBY
@/T-C/DS
S¥3
LO. S/ANE
PRP/SDK
@/MTL/REP
@©/RDM
SW4
AUTO/SK. S
@®/T-ADV
AN -
FM +/NONO
SW5
=
+
CN. C)
(N.C)
Keys " -", " +", "FM +" and "AM -" are assigned to the positions with the highest voltage so
that their ON or OFF can always be detected even when several
keys are pressed
simultaneously.
14
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