LC75864E Schematic ( PDF Datasheet ) - Sanyo Semicon Device

Teilenummer	LC75864E
Beschreibung	1/4 Duty LCD Display Drivers with Key Input Function
Hersteller	Sanyo Semicon Device
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Gesamt 26 Seiten Ordering number : ENN6860 CMOS IC LC75864E, 75864W 1/4 Duty LCD Display Drivers with Key Input Function Overview The LC75864E and LC75864W are 1/4 duty LCD display drivers that can directly drive up to 96 segments and can control up to four general-purpose output ports. These products also incorporate a key scan circuit that accepts input from up to 30 keys to reduce printed circuit board wiring. Features • Key input function for up to 30 keys (A key scan is performed only when a key is pressed.) • 1/4 duty - 1/2 bias and 1/4 duty - 1/3 bias drive schemes can be controlled from serial data (up to 96 segments). • Sleep mode and all segments off functions that are controlled from serial data • Segment output port/general-purpose output port function switching that is controlled from serial data • Serial data I/O supports CCB format communication with the system controller. • Direct display of display data without the use of a decoder provides high generality. • Independent VLCD for the LCD driver block (VLCD can be set to in the range VDD - 0.5 to 6.0 volts.) • Provision of an on-chip voltage-detection type reset circuit prevents incorrect displays. • RC oscillator circuit Package Dimensions unit: mm 3156-QIP48E [LC75864E] 17.2 14.0 1.5 1.0 0.35 36 37 1.6 1.5 25 24 0.15 48 1 13 12 0.1 2.7 0.8 unit: mm 3163A-SQFP48 15.6 SANYO: QIP48E [LC75864W] 0.75 36 37 9.0 7.0 0.5 0.18 0.75 0.15 25 24 48 1 13 12 • CCB is a trademark of SANYO ELECTRIC CO., LTD. • CCB is SANYO’s original bus format and all the bus addresses are controlled by SANYO. 0.5 0.5 SANYO: SQFP48 Any and all SANYO products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft’s control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO representative nearest you before using any SANYO products described or contained herein in such applications. SANYO assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO products described or contained herein. SANYO Electric Co.,Ltd. Semiconductor Company TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN D2501TN (OT) No. 6860-1/26 Block Diagram LC75864E, 75864W VLCD VLCD1 VLCD2 VSS TEST OSC DO DI CL CE VDD COMMON DRIVER CLOCK GENERATOR CCB INTERFACE VDET SEGMENT DRIVER & LATCH SHIFT REGISTER CONTROL REGISTER KEY BUFFER KEY SCAN No. 6860-6/26 6 Page LC75864E, 75864W Sleep Mode Functions Sleep mode is set up by setting S0 or S1 in 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 pin will stop (it will be started by a key press). This reduces power dissipation. This mode is cleared by sending control data with both S0 and S1 set to 0. However, note that the S1/P1 to S4/P4 outputs can be used as general-purpose output ports according to the state of the P0 to P2 control data bits, even in sleep mode. (See the control data description for details.) Key Scan Operation Functions 1. Key scan timing The key scan period is 384 T (s). To reliably determine the on/off state of the keys, the LC75864E/W scans the keys twice and determines that a key has been pressed when the key data agrees. It outputs a key data read request (a low level on DO) 800 T (s) after starting a key scan. If the key data does not agree and a key was pressed at that point, it scans the keys again. Thus the LC75864E/W cannot detect a key press shorter than 800 T (s). KS1 *3 1 1 *3 KS2 *3 2 2 *3 KS3 *3 KS4 *3 3 4 3 4 *3 1 T= *3 fosc KS5 *3 5 5 *3 KS6 6 6 Key on 768T (s) Note: *3. In sleep mode the high/low state of these pins is determined by the S0 and S1 bits in the control data. Key scan output signals are not output from pins that are set low. 2. In normal mode • The pins KS1 to KS6 are set high • When a key is pressed a key scan is started and the keys are scanned until all keys are released. Multiple key presses are recognized by determining whether multiple key data bits are set. • If a key is pressed for longer than 800 T (s) (where T = 1 ) the LC75864E/W outputs a key data read request (a fOSC low level on DO) to the controller. The controller acknowledges this request and reads the key data. However, if CE is high during a serial data transfer, DO will be set high. • After the controller reads the key data, the key data read request is cleared (DO is set high) and the LC75864E/W performs another key scan. Also note that DO, being an open-drain output, requires a pull-up resistor (between 1 and 10 kΩ). No. 6860-12/26 12 Page
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Besondere Datenblatt

Teilenummer	Beschreibung	Hersteller
LC75864E	1/4 Duty LCD Display Drivers with Key Input Function	Sanyo Semicon Device
LC75864W	1/4 Duty LCD Display Drivers with Key Input Function	Sanyo Semicon Device

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