lc75853nw Sanyo Semiconductor Corporation, lc75853nw Datasheet
lc75853nw
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lc75853nw Summary of contents
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... Ordering number : ENN4967C Overview The LC75853NE and LC75853NW are 1/3 duty LCD display drivers that can directly drive up to 126 segments and can control up to four general-purpose output ports. These products also incorporate a key scan circuit that accepts input from keys to reduce printed circuit board wiring ...
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Specifications Absolute Maximum Ratings 25°C, V Parameter Maximum supply voltage Input voltage Output voltage Output current Allowable power dissipation Operating temperature Storage temperature Allowable Operating Ranges –40 to +85°C, V Parameter Symbol Supply voltage ...
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Electrical Characteristics for the Allowable Operating Ranges Parameter Symbol Hysteresis V H Power-down detection voltage V DET Input high level current I IH Input low level current I IL Input floating voltage V IF Pull-down resistance R PD Output off ...
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When CL is stopped at the low level 2. When CL is stopped at the high level LC75853NE, 75853NW Figure 2 No. 4967-4/24 ...
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Block Diagram Pin Assignment LC75853NE, 75853NW No. 4967-5/24 ...
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Pin Functions Pin Pin No. Segment outputs for displaying the display data transferred by serial data S1/P1 to S4/ input S40 The S1/P1 to S4/P4 pins can be used as general-purpose output ...
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Serial Data Input 1. When CL is stopped at the low level Note: DD: Direction data 2. When CL is stopped at the high level Note: DD: Direction data • CCB address......42H • D126........Display data • S0, S1 ...
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Control Data Functions 1. S0, S1: Sleep control data These control data bits switch between normal mode and sleep mode and set the states of the KS1 to KS6 key scan outputs during key scan standby. Control data Mode S0 ...
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DR: 1/2 bias or 1/3 bias drive selection data This control data bit switches between LCD 1/2 bias or 1/3 bias drive. DR Drive scheme 0 1/3 bias drive 1 1/2 bias drive Display Data and Output Pin Correspondence ...
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Serial Data Output 1. When CL is stopped at the low level 2. When CL is stopped at the high level • CCB address...............43H • KD1 to KD30 .............Key data • SA...............................Sleep acknowledge data Note key data read ...
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Sleep Mode Functions Sleep mode is set up by setting the control data to 1. The segment outputs will all go low and the common outputs will also go low, and the oscillator on the OSC ...
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Key input 1 Key input 2 Key scan Serial data transfer Serial data transfer Key data read request 3. In sleep mode • The pins KS1 to KS6 are set to high or low by the S0 and S1 bits ...
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Key input (KS6 line) Key scan Serial data transfer Key data read request Multiple Key Presses Although the LC75853NE/NW is capable of key scanning without inserting diodes for dual key presses, triple key presses on the KI1 to KI5 input ...
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Duty, 1/2 Bias Drive Technique COM1 COM2 COM3 LCD driver output when all LCD segments corresponding to COM1, COM2, and COM3 are turned off. LCD driver output when only LCD segments corresponding to COM1 are on. LCD driver output ...
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Duty, 1/3 Bias Drive Technique COM1 COM2 COM3 LCD driver output when all LCD segments corresponding to COM1, COM2, and COM3 are turned off. LCD driver output when only LCD segments corresponding to COM1 are on. LCD driver output ...
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Voltage Detection Type Reset Circuit (VDET) This circuit generates an output signal and resets the system when power is first applied and when the voltage drops, i.e., when the power supply voltage is less than or equal to the power ...
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Output pin states during the reset period Output pin State during reset S1/P1 to S4/ S40 L COM1 to COM3 L KS1/S41, KS2/S42 L KS3 to KS5 KS6 Don’t care Note: *5. ...
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Sample Application Circuit 1 1/2 bias (for use with normal panels) C ≥ 0.047 µF From the controller To the controller To the controller power supply Note: *8.Add a capacitor to the power supply line so that the power supply ...
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Sample Application Circuit 2 1/2 bias (for use with large panels) C ≥ 0.047 µF 10 kΩ ≥ R ≥ 1 kΩ From the controller To the controller To the controller power supply Note: *8.Add a capacitor to the power ...
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Sample Application Circuit 3 1/3 bias (for use with normal panels) C ≥ 0.047 µF From the controller To the controller To the controller power supply Note: *8.Add a capacitor to the power supply line so that the power supply ...
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Sample Application Circuit 4 1/3 bias (for use with large panels) C ≥ 0.047 µF 10 kΩ ≥ R ≥ 1 kΩ From the controller To the controller To the controller power supply Note: *8.Add a capacitor to the power ...
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Notes on the controller key data read techniques 1. Timer based key data acquisition • Flowchart • Timing chart Key input Key scan Key address Key data read request Controller determination (key on) t3: Key scan execution time when the ...
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Interrupt based key data acquisition • Flowchart • Timing chart Key input Key scan Key address Key data read Key data read request Controller determination (key on) t3: Key scan execution time when the key data agreed for two ...
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Explanation In this technique, the controller uses interrupts to determine key on/off states and read the key data. The controller must check the DO state when CE is low low, the controller recognizes that a key ...