lc75700t Sanyo Semiconductor Corporation, lc75700t Datasheet
lc75700t
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lc75700t Summary of contents
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... Ordering number : ENN7632 Overview The LC75700T is a key scanning LSI that accepts input from keys and can control up to four general- purpose output ports. Therefore it can reduce the number of lines to the front panel in application systems. Features • Key input function for keys. ...
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... High level clock pulse width Data setup time Data hold time CE wait time CE setup time CE hold time DO output delay time DO rise time Note: *1. Since open-drain output, these times depend on the values of the pull-up resistor R LC75700T = Symbol Conditions V max V DD ...
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... Rosc = 39 kΩ OSC Cosc = 1000 pF V Key scan standby state 5 Output open DD fosc = 38 kHz 20 11 LC75700T 1 10 Ratings min typ max 0 –5 0. 100 250 100 200 500 6 V – 1.0 V – 0.5 V – ...
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... CL 50 When CL is stopped at the high level CE tø 50 LC75700T tø tø Figure ...
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... Block Diagram CLOCK OSC GENERATOR CCB INTERFACE LC75700T KEY SCAN KEY BUFFER GENERAL PORT CONTROL REGISTER SHIFT REGISTER No. 7632-5/16 ...
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... CL 19 CE: Chip enable CL: Synchronization clock DI 20 DI: Transfer data DO 17 DO: Output data V 15 Power supply. A voltage of between 2.7 V and 5.5 V must be supplied Ground. Must be connected to the system ground. SS LC75700T Function ) Active I/O Handling when unused H I GND — ...
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... CCB address: 62H • KC1 to KC6: Key scan output state setting data • PC1 to PC4: General-purpose output port state setting data • KP1, KP2: Selection data between the key scan output ports and the general-purpose output ports. LC75700T 1 0 KC1 ...
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... For example, if the KS4/P4 to KS6/P2 output pins are set to function as general-purpose output ports, when PC1 and PC2 are set to 1, and PC3 and PC4 are set to 0, the P1 and P2 output pins will output the high level (V P4 will output the low level ( LC75700T Maximum number Number of general-purpose of key inputs output ports (+ P1) ...
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... When the KS4/P4 to KS6/P2 output pins are set to function as the general-purpose output ports with the control data “KP1 and KP2”, and a key matrix keys is formed from the KS1 to KS3 output pins and the KI1 to KI5 input pins, the KD16 to KD30 key data bits will be set to 0. LC75700T 1 1 ...
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... Also note that DO being an open-drain output, requires a pull-up resistor (between 1 kΩ and 10 kΩ) . Key input 1 Key input 2 Key scan 615T[s] CE Serial data transfer Serial data transfer DI DO Key data read request LC75700T 576T[s] 615T[s] Key address (63H) Serial data transfer ...
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... LC75700T When any one of these keys is pressed, the oscillator on the OSC pin is started and the keys are scanned ...
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... CCB INTERFACE, SHIFT REGISTER, CONTROL REGISTER When a reset is applied, The CONTROL REGISTER is forcibly initialized internally. Then, when control data are transferred, the LSI operates according to the control data CLOCK OSC GENERATOR CCB INTERFACE LC75700T ). min Control data transfer "L" ...
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... The DO pin,being an open-drain output, requires a pull-up resistor. Select a resistance (between 1 and appropriate for the capacitance of the external wiring so that signal waveforms are not degraded. Each of The KS4/P4 to KS6/P2 pins must be set to either the key scan output port or the general-purpose output port. *7. LC75700T OSC ...
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... DO state when CE is low every t7 period without fail low, the controller recognizes that a key has been pressed and executed the key data read operation. The period t7 in this technique must satisfy the following condition. t7 > keydata read operation is executed when DO is high, the read key data (KD1 to KD30) will be invalid. LC75700T ...
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... Key scan execution time when the key data agreed for two key scans (615T (s)) t4: Key scan execution time when the key data did not agree for two key scans and the key scan was executed again. (1230T(s)) t5: Key address (63H) transfer time t6: Key data read time LC75700T No Key ...
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... SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of January, 2004. Specifications and information herein are subject to change without notice. LC75700T PS No. 7632-16/16 ...