Kenwood TS-440S Serivce Manual page 29

TS-440S
SEMICONDUCTO R
e
MB4052
PC 5
Co CI
7~J7
Comparato r
Resistor
IF-SHIFT -
R
Comparato r ®
D
R IT -
AI
O
Lam,
~ ,
Multi _
D I ple
780 0
PC7
12
ADC CLK PC 6
le
8255 (IC2 )
RS
+5v
r
Ag
o
Not us e
L
A3
EX . 2
EX.!
8
bi t
DA C
v
CC I
Regulator
2 .5 K
6 S
O
VccI
Vcc2 A .G D.G
MB4052 Pin Descriptio n
I/O Signal Pin Function s
Pin No . Pin Name
Symbol
Functio n
2
3
Range expande r
input
Range expande r
output
Ex . 2
Ex . 1
Analog input pin for expanding the range .
Analog output pin for expanding the range . Connect to any pin from AO to A3 .
By using Ex . 1, Ex . 2, the range is expanded to the x4 range .
4—7 Analog entrance
Ao—A 3
4-ch analog input pin . Channel 1 is selected by channel select input CO to Cl .
9
10
Channel select input
C o
C,
The input pin to designate the analog input channel for A/D converter . This signal is latche d
at the trailing edge of CS .
11 Chip select input
CS
This is the chip select input pin . When CS is inverted from "1" to "0", A/D convertin g
starts and data output is enabled . After A/D converting is over or when an interrupt is re -
quired, set the CS back to "1" .
12
A/D convertio n
clock
AD C
CLK
This is the clock input pin for A/D convertion input to the comparator register sequentially .
Convertion speed is determined by the clock speed . In the case of 8-bit, approx . 10 clock s
will be needed . However, it is not necessary that the clock period be fixed .
13
Data output DATA
OUT
This is the open collector to output the result of A/D convertion . The data is output in th e
order of the start bit, most significant bit, 2nd significant bit, . . ., least significant bit, an d
the stop bit, synchronized with ADCCLK .
14 Range select input RS
This is the input pin for selecting the voltage range of analog input . The VFS=Vcc,/8 rang e
is selected at "0", and the range of FVS=Vcc,i2 is selected at "1" . During convertion ,
hold this pin to "0" or "1" .
1
8
Analog groun d
Digital ground
A . G
D .G
Ground termina l
1 5
16
Power supply pin 2
Power supply pin 1
Vcc 2
Vcc 1
When driving with 3 .5 to 6 .0 V of power, connect Vcc, and Vcc 2 to each other, and appl y
the power voltage to them .
When driving 8 to 18 V of power, apply the power voltage to Vcc 2 . At this time, the 5 V
stabilized voltage is output to Vcc,, and approx . 10 mA current can be supplied externall y
to the IC .
When either 3 .5--6 .0 V or 8— 18V power is used, Vcc, is the reference voltage for A/ D
convertion .
• Channel Select
• Range select
• Wiring example when expanding the rang e
RS
'Convertion vol -
tage rang e
Vcc ,
0 0—' 8
Vcc ,
1 0--'
2
C ,
0
C o
0
Selected Ch .
A o
1
A ,
0
1 0
1 1
A 2
A 3
MB4052
2 9