IZ1238M 8-DIGITS CURENCY CALCULATOR 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 FEATURES • 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 • 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 ( Ta = 25oC ) Characteristic Terminal Voltage Supply Voltage (Battery) Operating Temperature Storage Temperature Symbol VDD Value - 0.3 ~ + 2.1 Unit V VIN - 0.3 ~ VDD + 0.3 V VDD 1.1 ~ 1.8 Ta Tstg 1 V 0 ~ + 50 o - 55 ~ + 125 o C C IZ1238M ELECTRICAL CHARACTERISTICS (Ta = 25oC, 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 Symb ol VIH VIL IIH IIL VIN = VDD VIN = 0V VOH without load VOL VOA VOB IOL = 15µA without load without load VOC without load Fd IOFF Supply Current Test Condition IDIS IOP VDD = 1.3V while display is on, Rf = 560K display is off VDD = 1.3V while display is on VDD = 1.1V, while operation Min Typ Max Unit 1.1 VDD - 0.4 1.5 1.8 V V 0.3 VDD 0.15 1 0.4 1 3 2.80 1.30 2.95 1.50 1.70 0 0.20 V 0.15 55 75 0.1 3.5 5 5.6 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. : - : negative number display 2 V Hz OUTPUT WAVEFORM 1; Hi (i = 1, 2, 3) Symbols µA µA IZ1238M 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. 3 IZ1238M LCD CONNECTION , C1 H1 C2 H2 , , , , H3 a1b1 c1 a2b2 c2 a3b3 c3 a4b4 c4 a5b5 c5 a6b6 c6 a7b7 c7a8b8 c8 a9 Mirror LCD with IZ1238M KEY DESCRIPTION 0 . ~ +/ ON/C Numerals input keys 9 = Decimal point key, Sign change key, Enter key Clear keys CE ON/C: Power ON/All clear (system reset) except special memory contents CE: Entry clear such as only the entered data is cleared + - % √ C × ÷ Four standard function keys Percent key, Extraction of square root key C 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 SM Set Currency rate C1/C2 (Entered Data set into special memory by this key) MR MC MR Recall memory, clear memory, recall and clear memory C OFF Off key APPLICATION CIRCUIT (mirror LCD) 4 IZ1238M C1 C2 13 11 a1-a5, b1-b4, c1-c4 H1 1 a6-a8, b5-b8, c5-c8 H2, H3 2 b3 c3 a4 b4 c4 a5 b5 c5 a6 b6 c6 a7 b7 c7 38 37 36 35 34 33 32 31 30 29 28 27 26 25 a3 39 c2 40 24 a8 b2 41 23 b8 a2 42 22 c8 c1 43 21 a9 b1 44 20 H2 IZ1238M a1 45 19 H3 H1 46 1.5V 33µF + 18 GND VDD 47 17 VC NC 48 NC 1 16 VA 15 VB 14 2 3 4 5 6 7 8 9 0.1µF 0.1µF CG OUT 560KΩ 10 11 12 13 K4 K6 K5 P1 P2 A5 A4 A3 A2 K2 K3 CG IN 3 2 6 P1 P2 A4 A5 A3 A2 K5 ON/C X + - 6 3 K6 OFF . . CE 9 5 2 K4 SM M+ M- 8 4 1 C1 +/- MR MC . C2 = % 7 MRC K2 0 K3 NOTE1: Chip substrate must be floating or connected to GND 5 IZ1238M PAD DIAGRAM 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 39 40 23 41 22 42 21 43 20 44 19 45 18 46 47 17 48 16 1 15 2 3 4 5 6 7 8 9 10 11 12 13 14 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 NC K4 K6 K5 P1 P2 A5 A4 A3 A2 K2 K3 CG in CG out VB VA VC GND H3 H2 a9 c8 b8 a8 Description No Connection Key input Key input Key input Strobe output Strobe output Strobe output Strobe output Strobe output Strobe output Key input Key input Resistor terminal Resistor terminal Capacitor terminal Capacitor terminal Capacitor terminal Ground Display output Display output Display output Display output Display output Display output X Y -1070 -1050 -885 -735 -585 -435 -285 -135 15 165 315 465 615 1050 1070 1070 1070 1070 1070 1070 1070 1070 1070 1070 -810 -1050 -1090 -1090 -1090 -1090 -1090 -1090 -1090 -1090 -1090 -1090 -1090 -1070 -915 -765 -485 -225 15 180 330 515 705 905 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 6 Pad Name c7 b7 a7 c6 b6 a6 c5 b5 a5 c4 b4 a4 c3 b3 a3 c2 b2 a2 c1 b1 a1 H1 VDD NC Description 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 Display output Power supply No Connection X Y 1050 885 735 585 435 285 135 -15 -165 -315 -465 -615 -765 -915 -1070 -1070 -1070 -1070 -1070 -1070 -1070 -1070 -1070 -1070 1070 1090 1090 1090 1090 1090 1090 1090 1090 1090 1090 1090 1090 1090 860 700 530 370 210 40 -130 -300 -470 -650