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Электронный компонент: IZ1228

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IZ1228/IZ1228M
1
8-D
IGIT
C
ALCULATOR

The IZ1228/IZ1228M 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 IZ1228M has
special keys (C1, C2, SM) for currency exchange calculations and special memory for save
currency rate.




FUNCTIONS
Four standard functions (+, -,
,
)
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
Direct (IZ1228) or Mirror (IZ1228M) LCD
Punctuation comma
Auto Power off
Saving special memory contents when auto
power off
Accumulating memory: M+, M-, MR, MC,
MRC
Bare chip is available







ABSOLUTE MAXIMUM RATINGS ( T
a
= 25
o
C )
Characteristic Symbol
Value
Unit
Terminal Voltage
V
DD
- 0.3 ~ + 2.1
V
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

IZ1228/IZ1228M
2


ELECTRICAL CHARACTERISTICS
(T
a
= 25
o
C, V
DD
= 1.5V, unless otherwise specified)
Characteristic Symbol
Test Condition
Min
Typ
Max
Unit
Input Voltage (Pins K2 ~ K6)
V
IH
V
DD
-
0.4
V
V
IL
0.4
Input Current (Pins K2 ~ K6)
I
IH
V
IN
= V
DD
1
uA
I
IL
V
IN
= 0V
0.3
1
3
Output Voltage 1 (P1, P2,
A2~A5)
V
OH
without
load V
DD
-
0.15
V
V
OL
I
OL
= 15
A
0.15
V
OA
without load
2.80
2.95
Output Voltage 2 (H1 ~ H3,
V
OB
without
load 1.30
1.50
1.70
V
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
1
Supply Current
I
DIS
V
DD
= 1.3V while display
is on
3.5
5
uA
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.

IZ1228/IZ1228M
3
Symbols : - : negative number display
E : error display
, : punctuation comma
M : non-zero memory indicator
C1, C2 : currency exchange operations indicator

Error detections
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.
IZ1228/IZ1228M
4

LCD CONNECTION
,
,
,
,
,
H1
H2
H3
c8
c7 b7a7 c6 b6a6 c5 b5a5 c4 b4a4 c3 b3a3 c2 b2a2 c1
b8a8
a9
b1a1
C1
C2

,
,
,
,
,
H1
H2
H3
c8
c7
c6 a7b7
c5 a6b6
c4 a5b5
c3 a4b4
c2 a3b3
c1 a2b2
a8b8
a9
a1b1
C1
C2




KEY DESCRIPTION


0 ~ 9 Numerals input keys

. +/- = Decimal point key, Sign change key, Enter key


ON/
C CE 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

C1 C2 Currency exchange keys.
Entered Data multiplied (when press C1) or divided
(when press C2) to the currency rate (content of special
memory)
Direct LCD
with IZ1228
Mirror LCD
with IZ1228M
IZ1228/IZ1228M
5

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

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


OFF Off key