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Электронный компонент: IZ1242C

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IZ1242C
1
S
CIENTIFIC
10
D
IGITS
LCD
C
ALCULATOR
The IZ1242C is the CMOS LSI for 10-digit display and the complete single chip for scientific
calculator with 56 programmed functions.
FEATURES
Display
-10 display digits plus negative code digit
- scientific and engineering displays
- 8 mantissa digits plus 2 exponent digits plus 2
negative code digits
14 kinds of special display
M
-
E
2ndF
HYP
DEG

RAD
Memory
Minus
Error
2nd
Function
Hyperbolic
Degree

Radian
GRAD
( )
BIN
OCT
HEX
CPLX

STAT
Gradient
Parenthesis
Binary mode
Octal mode
Hexadecimal
mode
Complex number
mode
Statistic
calculation mode
FUNCTIONS
Six operations
- four standard functions (+, -,
,
)
- y
x
-
y
- auto-constant
- parenthesis
- percentage
Memory calculation
- independent single memory (
M, RM, M+)
Four operations complex number calculation
1-variable functions
- trigonometric and arctrigonometric function
- hyperbolic and archyperbolic function
- factorial
- reciprocal and square
- square root and cube root
- time conversions
- angular mode conversion
2-variable functions
- polar-rectangular coordinate conversion
Statistics calculations
- number of sample (n)
- average (
)
- total of all data (
)
- total of square of all data (
x
2
)
- 2 kinds of the standard deviation (S,
)
Binary, octal, decimal and hexadecimal
number
calculations
- mutual conversions and calculations of binary,
octal,
decimal, and hexadecimal numbers
Display conversion
- conversion and setting of floating and
engineering displays
The minus sign of the mantissa is floating minus
The arithmetic key operation has the same
sequence
as the mathematical equation, 6 pending
operations
are allowed and ( ) are up to continuous 15
levels
Mutual conversion and calculation in arithmetic
among binary, octal, decimal and hexadecimal
numbers
One independent accumulating memory
It is possible to convert and fix the display
number
system by the F
E key
It is possible to specify decimal part digits by the
TAB key
Direct drive for LCD (1/3 prebias, 1/4 duty)
Automatic power off (about 7.5 minutes)
Low power consumption
V
DD
= 3.0V single power supply
Bare chip available
Direct type

ABSOLUTE MAXIMUM RATINGS (T
a
= 25
o
C)
Characteristic Symbol
Value
Unit
V
DD
- 0.3 ~ + 3.3
V
Terminal Voltage
V
IN
- 0.3 ~ V
DD
+
0.3 V
Operating Temperature
T
opr
0 ~ + 40
o
C
Storage Temperature
T
stg
- 55 ~ + 125
o
C

* Voltage greater than above may damage the circuit
IZ1242C
2
ELECTRICAL CHARACTERISTICS (T
a
= 25
o
C, V
DD
= 3.0V, V
SS
= 0V unless otherwise specified)
Characteristic Symbol Test
Condition
Min Typ Max
Unit
Operating Voltage
V
DD
2.5
3
3.4
V
V
IH
V
DD
-
0.5
V
DD
Input Voltage (K18 ~ K11)
V
IL
V
SS
V
SS
+0.5
V
High Output Voltage
(K18, K14, K12)
V
OH
V
DD
-
0.2 V
DD
V
DD
V
V
OH
V
DD
-0.2 V
DD
V
DD
Output Voltage (LCD,
COM)
V
OL
V
SS
V
SS
V
SS
+0.2
V
Low Output Voltage (K11)
V
OL
V
SS
V
SS
0.2 V
2/3V
DD
-0.2 2/3V
DD
2/3V
DD
+0.2
Middle Output Voltage
(LCD, COM)
V
OM
1/3V
DD
-0.2 1/3V
DD
1/3V
DD
+0.2
V
Key Pull Down
Resistance (K11)
R
pd
V
out
= 0V
30
50
70
K
Key Pull Up Resistance
(K18, K14, K12)
R
pu
V
out
V
DD
30
50
70
K
F
dis
Stand-by
V
DD
= 3V
30 45
OSC Frequency
F
opr
Operating
V
DD
= 3V
200
280
KHz
Frame Frequency
F
f
Stand-by
V
DD
= 3V
110 180 Hz
I
OFF
Display is off
V
DD
= 3V
1
3
I
DIS
Stand-by
V
DD
= 3V
20
35
Supply Current
I
OPR
Operation
V
DD
= 3V
70
120
A

BASIC SPECIFICATION
Number of display digits
10-digit display and 14 kinds of special displays
Engineering display
Max mantissa 8 digits plus exponent 2 digits plus each negative code digit
Normal display
Max 10 mantissa digits plus 1 negative code 6 digit.
It is possible to specify the number of 0 to 9 digits below the decimal place by assignment of the
decimal digit.
Classification of operating mode
The following 6 types of operation mode are set by the 2ndF key and below keys:
2ndF
STAT
: Statistic calculation mode set
2ndF
CLPX
: Complex number calculation
mode set
2ndF
- BIN
: Binary mode set
2ndF
- OCT : Octal mode set
2ndF
- HEX : Hexadecimal mode set
2ndF
- DEC : Decimal mode set
IZ1242C
3
Kinds of keys and classification of the multi-functions for all touch keys
STAT
OFF
ON/C
CE
F E
TAB
n!
tan
tan
-1
cos
sin
ln
y
log
a
b
hyp
archyp
cos
-1
sin
-1
2ndF
DRG
DRG
DEG
CLPX
xy
)
(
x
x
x
y
A
B
C
1/x
EXP
10
X
F
e
X
E
D
X M
x
BIN
RM
OCT
s
HEX
DATA CD
M+
+
=
%
DEC
9
6
3
8
5
2
7
4
1
0
+/-
RND
x
3
x
2
2
r
n
X Y
x
POWER
The condition during calculation
No key input is allowed and no data is displayed during calculation.

Display method
a.
Set number and result of operation are displayed in the right margin, minus floating.
b.
Display of decimal number operation results.
Display is made according to the display format that has been set by the F
E key.
Floating mode
10
10
|
x
|
10
100
: Exponent display
10
-99
|
x
|
10
-9
: Exponent display
0 and 10
-9
|
x
|
10
10
: Floating display
Engineering mode

0 and 10
-99
|
x
|
10
100
(all ranges); Exponent display.
The F
E key also converts the display format of a displayed numerical value simultaneously
with the display format setting.
At the same time, the number of digits below the decimal point of the above modes follows the
display format assigned by the 2ndF and F
E keys.
Further, in the same manner as the F
E key, the conversion is also takes place simultaneously
with the display format setting.
When the number of digits is specified, the last digit displayed is a rounded number, and when
there is no specification of the number of digits, the last digit displayed is a cut number.
IZ1242C
4
Example:
c.
Negative numbers are not displayed with the minus symbol "-" but are displayed in
hexadecimal, octal, and binary two's complements.
d.
Display style and special display
Display style
Special display
e.
Examples of display
Floating of -6000 1/x; TAB=7
Same as above, engineering display
Error display
Protection
a.
Memory overflow protection
If the overflow occurs in the memory calculation, the data before the calculation is retained.
M
E
DEG
E
IZ1242C
5
b.
Statistical overflow protection
If the overflow occurs in the statistical calculation, the data before the calculation is retained.
The number of digits of the internal retained data.
The number of digits of the mantissa of the displayed data is a maximum of 10 digits, but the
available data for successive calculations is the retained data.
The number of digits of the mantissa of the internally retained data is as follows:
Data input
Arithmetic
Engineering function.
Statistical function
Complex number
function
Memory calculation.
Number of random
Maximum
Maximum




Maximum
10 digits
10 digits




3 digits
Auto clear
When the power supply is suddenly turned on an auto clear routine is executed to initialize as
DEC mode, no TAB, floating and DEG modes.

Power off function
a.
Auto power off
About 7.5 minutes after operation is ended by pressing the key, the power supply is turned off.
b. OFF
Pressing this key will stop the oscillator (Memory safe guard).
c. ON
Pressing this key will wake the oscillator and initialize

OPERATION MODE
Operational mode
Mode
Operation
DEC
BIN
OCT HEX
STAT CPLX
4 Operation +, -,
,
, =
0 0
0 0 0 0
Power y
x
,
x
y
0 x
x x 0 x
Parenthesis ( )
0
0
0
0
x
x
Constant calculation
0
0
0
0
0
x
6 Operation
Percentage
calculation
0 x
x x 0 x
STAT Statistical
calculation
x
x
x
x
0
x
CLPX
CLPX
calculation
x x
x x x 0
Input a, b
0
x
x
x
x
0
Numeric input 0, 1
0
0
0
0
0
0
Numeric input (2 - 7)
0
x
0
0
0
0
Numeric input 8, 9
0
x
x
0
0
0
Hex input A - F
x
x
x
0
x
x
, Exp
0 x
x x 0 0
+/-
0 0
0 0 0 0
DATA setting
Shift
key
0 0
0 0 0 0
CE
0 0
0 0 0 0
Memory
Memory
calculation
0 0
0 0 0 0
Display conversion
F
E, TAB
0 x
x x x x
P - R conversion
P
R
P
0 x
x x x 0
Random RND
0
x x x 0 0
Function
1 variable function
0
x
x
x
0
0
Angular conversion
DRG, DRG
0
x
x
x
0
0