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IZ1239M 8 - DIGITS CURENCY CALCULATOR
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 (+, -, x, / ) * 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 ( Ta = 25oC ) Characteristic Terminal Voltage Supply Voltage (Battery) Operating Temperature Storage Temperature Symbol VDD VIN VDD Ta Tstg Value - 0.3 ~ + 2.1 - 0.3 ~ VDD + 0.3 1.1 ~ 1.8 0 ~ + 50 - 55 ~ + 125 Unit V V V o C o C
1
IZ1239M
ELECTRICAL CHARACTERISTICS
(Ta = 25 C, VDD = 1.5V, unless otherwise specified)
Characteristic Operating Voltage Input Voltage (Pins K2 ~ K6) Input Current (Pins K2 ~ K6) Output Voltage 1 (P1, P2, A2~A5) Output Voltage 2 (H1 ~ H3, a1 ~ a9, b1 ~ b8, c1 ~ c8) Display Frequency Symbol VIH VIL IIH IIL VOH VOL VOA VOB VOC Fd IOFF IDIS IOP Test Condition Min 1.1 VDD - 0.4 0.3 1 VDD - 0.15 0.15 2.80 1.30 55 2.95 1.50 0 75 1.70 0.20 Typ 1.5 Max 1.8 0.4 1 3 Unit V V A V V Hz 1 5 A
o
Supply Current
VIN = VDD VIN = 0V without load IOL = 15A without load without load without load VDD = 1.3V while display is on display is off VDD = 1.3V while display is on VDD = 1.1V, while operation
3.5 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
2
IZ1239M
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". -8 The decimal point is indicated in the position corresponding to a calculation result of time 10 , 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 VDD and disabled when pad F1 is connected to VSS. * During special memory recall the icon RATE only is on if pad F2 is opened or connected to VDD and icons RATE, C1, C2 are on if pad F2 is connected to VSS. 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.
3
IZ1239M
LCD CONNECTION
a1b1 c1 a2b2 c2 a3b3 c3 a4b4 c4 a5b5 c5 a6b6 c6 a7b7 c7 a8b8 c8
Mirror LCD with IZ1239M
KEY DESCRIPTION
0
~
9
Numerals input keys
.
+/
=
Decimal point key, Sign change key, Enter key
ON/
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
+
-
x
/
Four standard function keys
% C1 C2
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.
SM
Set Currency rate C1/C2 (Entered Data setted into special memory by this key). Recall special memory. When press RM, icon RATE is ON
RM
MR
MC
MRC Recall memory, clear memory, recall and clear memory
OFF
Off key
4
,
C1 C2
RATE
,
,
,
,
H1 H2 H3
a9
IZ1239M
APPLICATION CIRCUIT (mirror LCD)
C1 C2 RATE
13
11
a1-a5, b1-b4, c1-c4 H1
a6-a8, b5-b8, c5-c8 H2, H3
1
b3 c3 a4 b4 c4
a5 b5 c5 a6 b6
c6 a7 b7
c7
2
12 13 14 15 16 17 18 19 a3 c2 b2 a2 c1 b1 a1 11 10 9 8 7 6 5
20 21 22 23
24 25
26 a8 27 b8 28 c8 29 a9
IZ1239M
30 H2 31 H3 32
GND
H1 4 VDD 3 1.5V + F2 F1 2 1
33 VC 34 VA 35 VB 36 NC 48 47 46 45 44 43 42 41 40 39 38 37 K4 K6 K5 P1 P2 A5 A4 A3 A2 K2 K3 NC
0.1F 0.1F
33F
3 6
2
P1 K5
P2
A5
A4
A3
A2
ON/C
X
+
-
6
3
K6
OFF
. .
CE
9
5
2
K4
SMW
M+
M-
8
4
1
C1
+/-
MR
MC
.
MRC
SMR
K2
C2
=
%
7
0
K3
NOTE: Chip substrate must be floating or connected to GND
5
IZ1239M
PAD DIAGRAM
42 32 22 73 12 83 02 91 04 81 71 51 44 31 64 61 41 54 21
PAD LOCATION
Pad No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Pad Name F1 F2 VDD H1 a1 b1 c1 a2 b2 c2 a3 b3 c3 a4 b4 c4 a5 b5 c5 a6 b6 c6 a7 b7 Description Option Option Power supply Display output Display output Display output Display output Display output Display output Display output Display output Display output Display output Display output Display output Display output Display output Display output Display output Display output Display output Display output Display output Display output X -1070 -1070 -1070 -1070 -1070 -1070 -1070 -1070 -1070 -1070 -1070 -915 -765 -615 -465 -315 -165 -15 135 285 435 585 735 885 Y -810 -650 -470 -300 -130 40 210 370 530 700 860 1090 1090 1090 1090 1090 1090 1090 1090 1090 1090 1090 1090 1090 Pad No. 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 Pad Name c7 a8 b8 c8 a9 H2 H3 GND VC VA VB NC NC K3 K2 A2 A3 A4 A5 P2 P1 K5 K6 K4 Description Display output Display output Display output Display output Display output Display output Display output Ground Capacitor terminal Capacitor terminal Capacitor terminal No Connection No Connection Key input Key input Strobe output Strobe output Strobe output Strobe output Strobe output Strobe output Key input Key input Key input X 1050 1070 1070 1070 1070 1070 1070 1070 1070 1070 1070 1050 615 465 315 165 15 -135 -285 -435 -585 -735 -885 -1050 Y 1070 905 705 515 330 180 15 -225 -485 -765 -915 -1070 -1090 -1090 -1090 -1090 -1090 -1090 -1090 -1090 -1090 -1090 -1090 -1050
6
72
62 92 13 23 33 43 53 82 03 63 93 14 2 4 34 74
52
84
11 01 7 3 1 6 5 2 9 8 4

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