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 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 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 1 Unit V V V o C o C IZ1239M ELECTRICAL CHARACTERISTICS o (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 Supply Current Symbol VIH VIL IIH IIL VOH VOL VOA VOB VOC Fd IOFF IDIS IOP Test Condition VIN = VDD VIN = 0V without load IOL = 15µA 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 Min 1.1 VDD - 0.4 Typ 1.5 Max 1.8 1 0.4 1 3 0.3 VDD - 0.15 0.15 2.80 1.30 55 2.95 1.50 0 75 3.5 1.70 0.20 1 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. At currency exchange operations the result is formatted to two decimal. : - : negative number display E : error display , : punctuation comma M : non-zero memory indicator C1, C2 : currency exchange operations indicator RATE : special memory indicator 2 V µA V V Hz OUTPUT WAVEFORM 1; Hi (i = 1, 2, 3) Symbols Unit V µA 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 C1 H1 C2 H2 RATE H3 a9 Mirror LCD with IZ1239M KEY DESCRIPTION 0 . ~ 9 Numerals input keys +/ = Decimal point key, Sign change key, Enter key CE ON/ 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 + - % C1 × ÷ Four standard function keys Percent key C2 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). RM MR OFF Recall special memory. When press RM, icon RATE is ON MC MRC Recall memory, clear memory, recall and clear memory Off key 4 IZ1239M APPLICATION CIRCUIT (mirror LCD) C1 C2 RATE 13 11 a1-a5, b1-b4, c1-c4 a6-a8, b5-b8, c5-c8 H1 H2, H3 1 b3 c3 a4 b4 c4 a5 b5 c5 a6 b6 12 13 14 15 16 17 18 19 c6 a7 b7 20 21 22 23 24 25 a3 11 c2 10 26 a8 b2 9 27 b8 a2 8 28 c8 c1 7 29 a9 b1 6 a1 5 30 H2 IZ1239M 31 H3 H1 4 32 VDD 3 1.5V 33µF + 2 c7 GND 33 VC F2 2 34 VA F1 1 35 VB 0.1µF 0.1µF 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 3 2 6 P1 K5 K6 K4 P2 A4 A5 A3 A2 ON/C X + - 6 3 OFF . . CE 9 5 2 SMW M+ M- 8 4 1 C1 +/- MR MC . SMR C2 = % 7 MRC 0 NOTE: Chip substrate must be floating or connected to GND 5 K2 K3 IZ1239M PAD DIAGRAM 12 13 14 15 16 17 18 20 19 21 22 23 24 25 26 11 10 27 9 28 8 29 7 30 6 31 5 32 4 3 33 2 34 1 35 48 47 46 45 44 43 42 41 40 39 38 37 36 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 Y -1070 -1070 -1070 -1070 -1070 -1070 -1070 -1070 -1070 -1070 -1070 -915 -765 -615 -465 -315 -165 -15 135 285 435 585 735 885 -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 6 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 Y 1050 1070 1070 1070 1070 1070 1070 1070 1070 1070 1070 1050 615 465 315 165 15 -135 -285 -435 -585 -735 -885 -1050 1070 905 705 515 330 180 15 -225 -485 -765 -915 -1070 -1090 -1090 -1090 -1090 -1090 -1090 -1090 -1090 -1090 -1090 -1090 -1050