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參數(shù)資料
| 型號(hào)： | LC75700T-TLM-E |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 3/16頁 |
| 文件大小： | 0K |
| 描述： | IC KEY SCANNING LSI 20TSSOP |
| 標(biāo)準(zhǔn)包裝： | 2,000 |
| 系列： | * |
Example: When control data “KP1 and KP2 = 0, KC1 to KC5 = 0, KC6 = 1” are executed.
(i.e.key scanning with only KS6 high.)
No. 7632-11/16
LC75700T
KI3
KI4
KI2
KI1
KI5
*3
[H] KS6
[L] KS5
[L] KS4
[L] KS3
[L] KS2
[L] KS1
When any one of these keys is pressed, the
oscillator on the OSC pin is started and the
keys are scanned.
*3. These diodes are required to reliabled recognize multiple key presses of keys on the KS6 line when 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 keys on the KS1 to KS5 lines are pressed at the same time.
Key data read request
Key data read
DO
DI
Serial data transfer
Key address (63H)
Key address
Serial data transfer
CE
Key scan
Key input
(KS6 line)
615T[s]
Key data read request
615T[s]
T=
1
fosc
Multiple Key Presses
Although this LSI 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.
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