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EN6370B Datasheet(PDF) 23 Page - Sanyo Semicon Device |
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EN6370B Datasheet(HTML) 23 Page - Sanyo Semicon Device |
23 / 38 page LC75808W No.6370-23/38 3. In sleep mode • The pins KS1 to KS6 are set to high or low by the KC1 to KC6 bits in the control data. • If a key on one of the lines corresponding to a KS1 to KS6 pin which is set high is pressed, the oscillator on the OSC pin is started and a key scan is performed. 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 800T(s)(where T= ) the LC75808W outputs a key data read request (a 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 LC75808W performs another key scan. However, this dose not clear sleep mode. Also note that DO, being an open-drain output, requires a pull-up resistor (between 1 k Ω and 10 kΩ). • Sleep mode key scan example Example: When the control data bits KC1 to KC5 are 0, KC6 is 1, and SP is 1. (sleep with only KS6 high) Note: *4. These diodes are required to reliable recognize multiple key presses on the KS6 line when sleep mode state with only KS6 high, as in the above example. That is, these diodes prevent incorrect operations due to sneak currents in the KS6 key scan output signal when keys on the KS1 to KS5 lines are pressed at the same time. Multiple Key Presses Although the LC75808W is capable of key scanning without inserting diodes for dual key presses, triple key presses on the KI1 to KI5 input pin lines, or multiple key presses on the KS1 to KS6 output pin lines, multiple presses other than these cases may result in keys that were not pressed recognized as having been pressed. Therefore, a diode must be inserted in series with each key. Applications that do not recognize multiple key presses of three or more keys should check the key data for three or more 1 bits and ignore such data. 1 fOSC 800T [s] 800T [s] Serial data transfer Serial data transfer Serial data transfer Key address(43H) Key address Key data read request Key data read Key data read Key data read request A12914 Key input (KS6 line) Key scan CE DI DO fosc 1 T= [L] KS1 [L] KS2 [L] KS3 [L] KS4 [H] KS6 KI1 KI2 KI3 KI4 [L] KS5 KI5 *4 A12913 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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