IZ1223M BASIC FUNCTION 8-DIGITS LCD CALCULATOR WITH TOUCH TONE AND PUNCTUATION FUNCTION The IZ1223M is a single chip CMOS LSI with 8-digit arithmetic operation, single memory, extraction-of-square-root, percentage calculation and auto power off and punctuation and touch tone function, designed for FEM LCD operation with a 3.0V power supply. FUNCTIONS FEATURES • Four standard functions (+, -, ×, ÷ ) • Auto constant calculations (constant: multiplicand, divisor, addend and subtrahend) • Square and reciprocal calculations • Mark-up and mark-down calculations • Extraction of square root • Percentage calculations • Chain multiplication and division • Power calculations • Rough estimate calculations • Touch tone function • Punctuation comma display • Clear key: ON/C, ON/CE, CE o ABSOLUTE MAXIMUM RATINGS (Ta = 25 C) Characteristic Symbol VGG VIN VGG TOPR Tstg Terminal Voltage Supply Voltage Operating Temperature Storage Temperature • Single chip CMOS construction • Floating decimal point • LCD direct drive • Overflow indication: “E” • Accumulating memory: M+, M-, RM, CM, RM/CM • Bare chip available • Mirror type Value Unit Note - 0.3 ~ + 3.5 - 0.3 ~ VGG + 0.3 2.5 ~ 3.5 0 ~ + 50 - 55 ~ + 125 V V V o C o C 1 Note: 1. Maximum voltage on any pin with respect to the GND ELECTRICAL CHARACTERISTICS (Ta = 25oC, VGG = 3.0V, unless otherwise specified) Characteristic Symbo Test Condition Min Typ Max Uni l t Input Voltage 1 (K2 ~ K6, TI, VIH1 VGG - 0.4 V S2) VIL1 0.4 VIH2 VGG - 0.4 Input Voltage 2 (S1) Input Current 1 (K2 ~ K6, TI) Input Current 2 (S2) Input Current 3 (S1) Input Current 4 (S1) 0.2 VIL2 IIH1 IIL1 IIH2 IIL2 IIH3 IIL3 IIH4 VIN = VGG VIN = 0V VIN = VGG VIN = 0V VIN = VGG S2=GN D VIN = 0V VIN = VGG S2 = 1 5.5 5 20 10 30 1 10 1 1 1 15 40 V µA µA µA µA IZ1223M Characteristic Output Voltage 1 (P1, P2, A2~A5) Output Voltage 2 (H1 ~ H3, a1 ~ a9, b1 ~ b8, c1 ~ c8) Symbo l IIL4 VOH1 VGG VIN = 0V without load VOL1 VOA VOB IOUT = 15µA without load without load VOC without load VGG = 3V while display is on, VGG = 3V, VOL = 0.5V, TI =3V VGG = 3V, VOL = 0.5V, TI =3V Display off, VGG = 3V VGG = 3V while display is on, Display Frequency Fd Touch Tone (PO) IOL Output Drive Current Test Condition IOH IOFF (1) Dissipation Idis (2) Min Typ Max Uni t 1 VGG 0.15 V 0.15 2.80 1.30 50 2.95 1.50 1.70 0 0.20 75 V Hz 3 mA -3 0.1 20 30 µA NOTE: 1) Measured by the next test circuit after power supply automatically turns off. 2) Measured by the next test circuit while “0” is being displayed after auto clear operation and while key is not being depressed. 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. Integral number : 8 digits leading zero suppression. Zero shift. Symbols : - : negative number display E : error display M : memory display , : punctuation comma ♪ : touch tone indicator 2 IZ1223M Error detections • System errors occur when: 1) The integral part of any memory calculation result exceeds 8 digits. 2) The division by zero. 3) The extraction of square root of a negative number. • Rough estimate calculation error 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 or ON/CE key. • Rough estimate calculation error A rough estimate calculation error can be released by the ON/C, ON/CE, CE key. A calculation result is not cleared by ON/CE, CE key but is retained. 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 memory content is retained. Memory indication If the memory content is not zero, “M” is indicated in the sign-digit position. Doubler key depression The order of the priority when two keys are being depressed simultaneously, is as follows: 3 IZ1223M 5 OFF ON/C ON/CE = M+ x . . +/- CE + M- % 6 4 RM/CM . 9 - 0 1 3 2 CM 7 8 RM When the OFF and ON/C key are depressed simultaneously, the OFF key is given priority. 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. DISPLAY FONTS • Numericals font Sigh font , 0HPRU\ PLQXV HUURU SXQFWXDWLRQ WRXFKWRQHLQGLFDWRU LCD connector , , , , , . . . . . . . . H2 H3 a9 c8 b8 a8 c7 b7 a7 c6 b6 a6 c5 b5 a5 c4 b4 a4 c3 b3 a3 c2 b2 a2 c1 b1 a1 H1 4 , , , IZ1223M , , H1 H2 H3 a9 c8 b8a8 c7 b7a7 c6 b6 a6 c5 b5a5 c4 b4a4 c3 b3a3 c2 b2a2 c1 b1a1 AUTO POWER OFF Power automatically turns off after 9 - 11 minutes pass from the last key pressure. (S1 = Low, S2 = High) ON/C KEY All operations except memory content are cleared by ON/C key. TOUCH TONE (♪) KEY • When power is ON, the touch tone function is enable and the beep sound is generated output during 125ms and ♪ sing is displayed on LCD. • Selection of touch tone function is toggled by touch tone key. • Output wave form. ft = 2KHz - VOA - VOC 125 ms MARK-UP AND MARK-DOWN CALCULATION Mark-up and mark-down calculation are performed as follows. ENTRY A ± B % DISPLAY A x B % +OR= A A B A ± AB/100 5 A A B AB/100 AB/100 A+AB/100 OR A --AB/100 IZ1223M APPLICATION CIRCUIT . . . , , , , , . . . . . 13 a1-a5, b1-b4, c1-c4 H1 1 33 µ + c2 b2 a2 c1 b1 a1 H1 42 VDD 43 44 PO 01 + TST - 02 03 04 05 06 07 08 09 10 11 12 13 K4 K6 K5 P1 P2 A5 A4 A3 A2 K2 K3 TI RP D2 a6-a9, b5-b8, c5-c8 a3 b3 c3 a4 b4 c4 a5 b5 c5 a6 b6 c6 a7 b7 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 c7 20 a8 19 b8 36 18 c8 37 17 a9 38 16 H2 39 IZ1223M 15 H3 40 14 GND 41 VDD D1 11 3 2 6 K5 K6 P2 P1 ON/C X ON/CE + A3 A2 6 3 9 5 2 M+ M- 8 4 1 +/- RM CM . 7 RCM % 6 A4 CE OFF K4 A5 K2 0 K3 H2, H3 2 IZ1223M PAD DIAGRAM 7 IZ1223M PIN DESCRIPTION Pa d No. 1 Pad Name PO 2 I/O Description Pad No. 23 Pad Name a7 O Piezo output K4 I Key input 24 3 K6 I Key input 4 K5 I 5 P1 6 I/O Description O Display output c6 O Display output 25 b6 O Display output Key input 26 a6 O Display output O Strobe output 27 c5 O Display output P2 O Strobe output 28 b5 O Display output 7 A5 O Strobe output 29 a5 O Display output 8 A4 O Strobe output 30 c4 O Display output 9 A3 O Strobe output 31 b4 O Display output 10 A2 O Strobe output 32 a4 O Display output 11 K2 I Key input 33 c3 O Display output 12 K3 I Key input 34 b3 O Display output 13 Ti I Test input 35 a3 O Display output 14 GND Ground 36 c2 O Display output 15 H3 O COMMON 3 37 b2 O Display output 16 H2 O COMMON 2 38 a2 O Display output 17 a9 O Display output 39 c1 O Display output 18 c8 O Display output 40 b1 O Display output 19 b8 O Display output 41 a1 O Display output 20 a8 O Display output 42 H1 O COMMON 1 21 c7 O Display output 43 VGG 22 b7 O Display output 44 TST 8 Power supply I Test