IZ1228/IZ1228M 8-DIGIT CALCULATOR 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 FEATURES • 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 • 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 ( Ta = 25oC ) Characteristic Terminal Voltage Supply Voltage (Battery) Operating Temperature Storage Temperature Symbol VDD VIN VDD Ta Tstg 1 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 IZ1228/IZ1228M ELECTRICAL CHARACTERISTICS (Ta = 25oC, VDD = 1.5V, unless otherwise specified) Characteristic 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 Test Condition VOL VOA VOB VOC IOL = 15µA without load without load without load Fd VDD = 1.3V while display is on, Rf = 560K display is off VDD = 1.3V while display is on VDD = 1.1V, while operation IOFF IDIS IOP VIN = VDD VIN = 0V without load Min VDD - 0.4 Typ Max 0.3 VDD 0.15 1 0.4 1 3 2.80 1.30 2.95 1.50 0 55 75 uA V 0.15 3.5 1.70 0.20 V Hz 1 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. 2 Unit V uA IZ1228/IZ1228M 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”. -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. 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 IZ1228/IZ1228M LCD CONNECTION , , , , , Direct LCD with IZ1228 H1 C1 H2 C2 H3 c8 b8a8 c7 b7a7 c6 b6a6 c5 b5a5 c4 b4a4 c3 b3a3 c2 b2a2 c1 b1a1 , , , , a9 C1 H1 C2 H2 Mirror LCD with IZ1228M , H3 a1b1 c1 a2b2 c2 a3b3 c3 a4b4 c4 a5b5 c5 a6b6 c6 a7b7 c7a8b8 c8 a9 KEY DESCRIPTION 0 . ~ 9 Numerals input keys +/- ON/ C = Decimal point key, Sign change key, Enter key 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 + √ % C1 × - C2 ÷ Four standard function keys Percent key, Extraction of square root key Currency exchange keys. Entered Data multiplied (when press C1) or divided (when press C2) to the currency rate (content of special memory) 4 IZ1228/IZ1228M SM Set Currency rate C1/C2 (Entered Data set into special memory by this key) MR OFF MC MRC Recall memory, clear memory, recall and clear memory Off key 5 IZ1228/IZ1228M APPLICATION CIRCUIT (direct LCD) C1 C2 11 13 a6-a8, b5-b8, c5-c8 a1-a5, b1-b4, c1-c4 H2, H3 H1 2 1 c7 b7 a7 c6 b6 a6 c5 b5 a5 25 27 28 29 30 31 32 33 34 35 36 37 38 26 c4 b4 a4 c3 b3 39 a3 a8 24 40 c2 b8 23 41 b2 c8 22 42 a2 a9 21 43 c1 44 b1 45 a1 H2 20 H3 19 GND 18 VC 17 47 TST 16 48 VDD VB 15 49 NC VA 0.1µF CG OUT 46 H1 14 1.5V 1 NC 560KΩ 13 CG IN 12 11 10 9 8 K3 K2 A2 A3 A4 7 A5 6 P2 5 3 2 P1 K5 K6 K4 4 + 0.1µF IZ1228 (CHIP) 3 2 6 A2 A3 P1 P2 A5 - + X ON/C 9 CE . . OFF 8 M- M+ SM . MC MR +/- C1 MRC 7 % 6 2 5 1 4 = 3 K2 0 K3 A4 K5 K6 K4 C2 NOTE1: Chip substrate must be floating or connected to GND 6 33µF IZ1228/IZ1228M APPLICATION CIRCUIT (mirror LCD) C1 C2 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 38 37 36 35 34 33 32 31 1.5V + c6 a7 b7 30 29 28 27 25 26 a3 39 c2 40 24 a8 b2 41 23 b8 a2 42 22 c8 c1 43 21 a9 b1 44 a1 45 19 H3 H1 46 18 GND TST 47 17 VC VDD 48 16 VA NC 49 15 VB 20 H2 IZ1228M (CHIP) 33µF 14 1 NC + 2 c7 2 3 4 5 6 7 8 9 10 K4 K6 K5 P1 P2 A5 A4 A3 A2 11 12 K2 K3 0.1µF 0.1µF CG OUT 560KΩ 13 CG IN 3 2 6 P1 K5 K6 K4 P2 A4 A5 A3 A2 ON/C X + - 6 3 OFF . . CE 9 5 2 SM M+ M- 8 4 1 C1 +/- MR MC . C2 = 7 MRC % NOTE1: Chip substrate must be floating or connected to GND 7 K2 0 K3 IZ1228/IZ1228M PAD DIAGRAM 25 26 27 28 29 30 31 32 33 34 35 37 36 38 24 39 40 23 41 22 42 21 43 20 44 19 45 46 18 47 17 48 49 16 1 15 14 13 12 11 10 9 8 7 6 5 4 3 2 PAD LOCATION Pad No. Pad Name Description 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 NC K4 K6 K5 P1 P2 A5 A4 A3 A2 K2 K3 CG in CG out VB 16 VA 17 VC 18 19 20 21 22 23 24 25 GND H3 H2 a9 c8 b8 a8 c7 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 Display output Pad Name -821 -1065 -1085 -1085 -1085 -1085 -1085 -1085 -1085 -1085 -1085 -1085 -1085 -1065 -913 Pa d No. 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 b7 a7 c6 b6 a6 c5 b5 a5 c4 b4 a4 c3 b3 a3 c2 -1065 -763 41 -1065 -487 -1065 -1065 -1065 -1065 -1065 -1065 -1065 -1045 -223 17 177 327 507 697 902 1065 X Y 1065 1045 880 730 580 430 280 130 -20 -170 -320 -470 -620 -1035 -1065 8 Description X Y 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 -890 -740 -590 -440 -240 -140 10 160 310 460 610 760 910 1065 1065 1085 1085 1085 1085 1085 1085 1085 1085 1085 1085 1085 1085 1085 849 694 b2 Display output 1065 544 42 a2 Display output 1065 394 43 44 45 46 47 48 49 c1 b1 a1 H1 TST VDD NC Display output Display output Display output Display output Test Power supply No Connection 1065 1065 1065 1065 1065 1065 1065 244 89 -61 -211 -340 -521 -671 IZ1228/IZ1228M PAD DIAGRAM 38 37 36 35 33 34 32 30 31 29 28 27 26 25 24 39 40 23 41 22 42 21 43 20 44 19 45 46 18 47 17 48 49 16 1 15 2 3 4 5 6 7 8 9 10 11 12 13 14 PAD LOCATION Pad No. Pad Name Description 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 NC K4 K6 K5 P1 P2 A5 A4 A3 A2 K2 K3 CG in CG out VB 16 VA 17 VC 18 19 20 21 22 23 24 25 GND H3 H2 a9 c8 b8 a8 c7 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 Display output Pad Name -821 -1065 -1085 -1085 -1085 -1085 -1085 -1085 -1085 -1085 -1085 -1085 -1085 -1065 -913 Pa d No. 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 b7 a7 c6 b6 a6 c5 b5 a5 c4 b4 a4 c3 b3 a3 c2 1065 -763 41 1065 -487 1065 1065 1065 1065 1065 1065 1065 1045 -223 17 177 327 507 697 902 1065 X Y -1065 -1045 -880 -730 -580 -430 -280 -130 20 170 320 470 620 1035 1065 9 Description X Y 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 890 740 590 440 240 140 -10 -160 -310 -460 -610 -760 -910 -1065 -1065 1085 1085 1085 1085 1085 1085 1085 1085 1085 1085 1085 1085 1085 849 694 b2 Display output -1065 544 42 a2 Display output -1065 394 43 44 45 46 47 48 49 c1 b1 a1 H1 TST VDD NC Display output Display output Display output Display output Test Power supply No Connection -1065 -1065 -1065 -1065 -1065 -1065 -1065 244 89 -61 -211 -340 -521 -671