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Электронный компонент: IZ1238M

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IZ1238M
1
8-D
IGITS
C
URENCY
C
ALCULATOR
The IZ1238M are a single chip CMOS LSI with 8-digit arithmetic operation, single memory,
extraction-of-square-root, percentage calculation and auto power off function, designed for FEM
LCD operation with a 1.5V power supply. The IZ1238M has special keys (C1, C2, SM) for
currency exchange calculations and special memory for save currency rate. The result of
currency exchange operations rounded to two decimal if it exceeds two decimal.

FUNCTIONS
Four standard functions (+, -,
,
)
The result of currency exchange operation
is
rounded to two decimal
Auto constant calculations
Mark-up and mark-down calculations
Percentage calculations
Chain multiplication and division
Power calculations
Rough estimate calculations
Clear key: ON/C, CE
Currency exchange calculations :
Currency 1
Currency 2 and
Currency 2
Currency 1
FEATURES
Single chip CMOS construction
Floating decimal point
LCD direct drive
Special memory for currency rates
Overflow indication: "E"
On-chip oscillator components
Mirror type LCD
Punctuation comma
Auto Power off
Saving special memory contents when auto
power off
Currencies C1, C2 indication
Accumulating memory: M+, M-, MR, MC,
MRC
Bare chip is available




ABSOLUTE MAXIMUM RATINGS ( T
a
= 25
o
C )
Characteristic Symbol
Value Unit
V
DD
- 0.3 ~ + 2.1
V
Terminal Voltage
V
IN
- 0.3 ~ V
DD
+
0.3 V
Supply Voltage (Battery)
V
DD
1.1 ~ 1.8
V
Operating Temperature
T
a
0 ~ + 50
o
C
Storage Temperature
T
stg
- 55 ~ + 125
o
C


IZ1238M
2

ELECTRICAL CHARACTERISTICS
(T
a
= 25
o
C, V
DD
= 1.5V, unless otherwise specified)
Characteristic Symb
ol
Test Condition
Min
Typ
Max
Unit
Operating Voltage
1.1
1.5
1.8
V
V
IH
V
DD
-
0.4
V
Input Voltage (Pins K2 ~
K6)
V
IL
0.4
I
IH
V
IN
= V
DD
1
A
Input Current (Pins K2 ~
K6)
I
IL
V
IN
= 0V
0.3
1
3
V
OH
without
load
V
DD
-
0.15
V
Output Voltage 1 (P1,
P2, A2~A5)
V
OL
I
OL
= 15
A
0.15
V
OA
without load
2.80
2.95
V
OB
without
load 1.30
1.50
1.70
V
Output Voltage 2 (H1 ~
H3,
a1 ~ a9, b1 ~ b8, c1 ~
c8)
V
OC
without
load
0
0.20
Display Frequency
F
d
V
DD
= 1.3V while display is
on,
Rf = 560K
55 75
Hz
I
OFF
display is off
0.1
I
DIS
V
DD
= 1.3V while display is
on
3.5
5
A
Supply Current
I
OP
V
DD
= 1.1V, while
operation
5.6

OUTPUT WAVEFORM 1; Hi (i = 1, 2, 3)

OUTPUT WAVEFORM 2; ai, bi, ci, (i = 1, 2, ... , 8)

FUNCTIONAL DESCRIPTION

Decimal point system

Complete floating decimal point system. 8 digits leading zero suppression. Zero shift.

Symbols : - : negative number display
IZ1238M
3
E : error display
, : punctuation comma
M : non-zero memory indicator
C1, C2 : currency exchange operations indicator

Error detection
System errors occur when:
1) The division by zero.
2) The extraction of square root of a negative number.
Rough estimate calculation error occur when
The integral part of the result of any standard functions, percentage, square, reciprocal, or
power calculations exceed 8 digits.

Error indication
System error
"0" is indicated in the 1-digit position and "E" in the sign-digit position.
Rough estimate calculation error
The high-order 8-digit calculation result is indicated together with "E".
The decimal point is indicated in the position corresponding to a calculation result of time 10
-8
,
and no zero shift is performed

Error release
System error
A system error can be release by the ON/C key.
Rough estimate calculation error
A rough estimate calculation error can be released by the ON/C, CE key.

Number entry
Numerical can be entered up to 8 digits. Numerical entries equal to 9 digits or more are ignored.

Memory protection
In any error detection, the special memory content is retained when auto power off.

Key bounce protection

Front edge
Down to 1 word and up to about 3 words.

Trailing edge
9 words
1 word is 3.3ms when display frequency is fd = 100Hz.

Auto power OFF
Power automatically turns off after 9 - 11 minutes pass from the last key pressure. The special
memory content is saving when power auto off.
IZ1238M
4
LCD CONNECTION
,
,
,
,
,
H1
H2
H3
c8
c7
c6 a7b7
c5 a6b6
c4 a5b5
c3 a4b4
c2 a3b3
c1 a2b2
a8b8
a9
a1b1
C1
C2



KEY DESCRIPTION
Numerals input keys


Decimal point key, Sign change key, Enter key

Clear keys
ON/C: Power ON/All clear (system reset) except special memory contents
CE: Entry clear such as only the entered data is cleared
Four standard function keys

Percent key, Extraction of square root key

Currency exchange keys
Entered Data multiplied (when press C1) or divided (when
press C2) to the currency rate (content of special memory)
and result of the operation rounded to two decimal
Set Currency rate C1/C2
(Entered Data set into special memory by this key)



Recall memory, clear memory, recall and clear memory

OFF
Off key
APPLICATION CIRCUIT (mirror LCD)
Mirror LCD with IZ1238M
0
~
9
.
+/
=
ON/
C
CE
+
-
%
C
C
SM
MR
MC
MR
C
IZ1238M
5
IZ1238M
13
11
a1-a5, b1-b4, c1-c4
a6-a8, b5-b8, c5-c8
H1
H2, H3
2
1
a3
c2
b2
a2
c1
b1
a1
H
1
c7
a9
a8
b8
c8
H
2
H
3
GND
VC
VA
VB
CG
K
4
K
6
K
5
P
1
P
2
A
5
A
4
A
3
A
2
K
2
K
3
CG
0.1 F
0.1 F
560K
2
3
6
P
1
P
2
A
5
A
4
A
3
A
2
K
5
K
6
K
4
ON/C
OFF
MRC
C1
C2
X
M+
+/-
=
%
MR
M-
CE
+
-
9
8
MC
SM
7
.
4
5
6
3
2
1
0
.
.
K
2
K
3
IN
OUT
NC
NC
V
DD
2
3 4
5 6
7
8 9 10 11 12 13
14
15
16
17
18
19
20
21
22
23
24
25
b7
b3 c3 a4 b4 c4 a5 b5 c5 a6 b6 c6 a7
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
1
48
+
33 F
1.5V
C1
C2


NOTE1: Chip substrate must be floating or connected to GND