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Электронный компонент: IZ1239M

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IZ1239M
1
8
-
D
IGITS
C
URENCY
C
ALCULATOR

The IZ1239M 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 IZ1239M has special keys (C1, C2, SM, RM) for
currency exchange calculations and special memory for save currency rate. The result of
currency exchange operations formatted to two decimal always and rounded 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 LCD
Punctuation comma
Auto Power off
Saving special memory contents when auto
power off
Accumulating memory: M+, M-, MR, MC, MRC
Currencies C1, C2, SMR, SMW and Rate
indication
Rounded function (option)
Formatting function
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

IZ1239M
2
ELECTRICAL CHARACTERISTICS
(T
a
= 25
o
C, V
DD
= 1.5V, unless otherwise specified)
Characteristic Symbol
Test
Condition
Min Typ
Max
Unit
Operating Voltage
1.1
1.5
1.8
V
V
IH
V
DD
-
0.4
Input Voltage (Pins K2
~ K6)
V
IL
0.4
V
I
IH
V
IN
= V
DD
0.3
1
Input Current (Pins K2
~ K6)
I
IL
V
IN
= 0V
1
3
A
V
OH
without
load
V
DD
-
0.15
Output Voltage 1 (P1,
P2, A2~A5)
V
OL
I
OL
= 15
A
0.15
V
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
55 75
Hz
I
OFF
display is off
1
Supply Current
I
DIS
V
DD
= 1.3V while display is
on
3.5
5
A
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.
At currency exchange operations the result is formatted to two decimal.

Symbols : - : negative number display
E : error display
, : punctuation comma
M : non-zero memory indicator
C1, C2 : currency exchange operations indicator
RATE : special memory indicator
IZ1239M
3
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.

Option
The rounding and formatting functions are enabled when pad F1 is opened or connected to V
DD
and disabled when pad F1 is connected to V
SS
.
During special memory recall the icon RATE only is on if pad F2 is opened or connected to V
DD
and icons RATE, C1, C2 are on if pad F2 is connected to V
SS
.

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.
IZ1239M
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
RATE


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


Currency exchange keys

Entered Data multiplied (when press C1) or divided
(when press C2) to the currency rate (content of special
memory). During this operation icon C1 or C2 is on.

Set Currency rate C1/C2
(Entered Data setted into special memory by this key).

RM Recall special memory. When press RM, icon RATE is ON


MR MC MRC Recall memory, clear memory, recall and clear memory


OFF Off key

Mirror LCD with IZ1239M
+/
=
ON/
CE
0
~
9
.
C1
C2
+
-
%
SM
IZ1239M
5

APPLICATION CIRCUIT (mirror LCD)
IZ1239M
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
K
4
K
6
K
5
P
1
P
2
A
5
A
4
A
3
A
2
K
2
K
3
0.1 F
0.1 F
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
SMW
SMR
7
.
4
5
6
3
2
1
0
.
.
K
2
K
3
F1
F2
NC
NC
V
DD
2
3
4
5
6
7
8
9
10
39
38 37
36
35
34
33
32
31
30
29
28
27
26
25
b7
b3 c3 a4 b4
c4
a5 b5
c5
a6 b6
c6
a7
24
23
22
21
20
19
18
17
16
15
14
13
12
11
40
41
42
43
44
45
46
47
1
48
33 F
1.5V
C1
RATE
C2
+


NOTE: Chip substrate must be floating or connected to GND