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PDF LC75700T Data sheet ( Hoja de datos )
| Número de pieza | LC75700T | |
| Descripción | Key Scan IC | |
| Fabricantes | ON Semiconductor | |
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Ordering number : ENN7632
LC75700T
CMOS IC
Key Scan IC
http://onsemi.com
Overview
The LC75700T is a key scanning LSI that accepts input from up to 30 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 up to 30 keys.
General-purpose output ports for up to four pins.
A key scan is performed only when a key is pressed, and thus power dissipation is reduced.
Serial data I/O supports CCB format communication with the system controller.
Switching between the key scan output port and general purpose output port functions can be controlled by the
control data.
The RES pin is provided. This pin disables key scanning, and forces the general-purpose output ports to the low
level.
RC oscillator circuit
TSSOP20(225mil)
ORDERING INFORMATION
Device
LC75700T-MPB-E
LC75700T-TLM-E
LC75700TS-MPB-E
LC75700TS-TLM-E
Package
TSSOP20(225mil)
(Pb-Free)
TSSOP20(225mil)
(Pb-Free)
TSSOP20(225mil)
(Pb-Free)
TSSOP20(225mil)
(Pb-Free)
Shipping (Qty / Packing)
70 / Fan-Fold
2000 / Tape &Reel
70 / Fan-Fold
2000 / Tape &Reel
CCB is ON Semiconductor® ’s original format. All addresses are managed
by ON Semiconductor® for this format.
CCB is a registered trademark of Semiconductor Components Industries, LLC.
Semiconductor Components Industries, LLC, 2013
October, 2013
13004TN(OT) No.7632-1/16
1 page  
Block Diagram
LC75700T
VDD
VSS
OSC
CLOCK
GENERATOR
CCB
INTERFACE
KEY SCAN
KEY BUFFER
GENERAL PORT
CONTROL REGISTER
SHIFT REGISTER
No. 7632-5/16
5 Page 
LC75700T
Example: When control data “KP1 and KP2 = 0, KC1 to KC5 = 0, KC6 = 1” are executed.
(i.e.key scanning with only KS6 high.)
[L] KS1
[L] KS2
[L] KS3
[L] KS4
[L] KS5
[H] KS6
KI1
KI2
KI3
KI4
KI5
When any one of these keys is pressed, the
oscillator on the OSC pin is started and the
keys are scanned.
*3
*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 input
(KS6 line)
Key scan
615T[s]
CE
Serial data transfer Serial data transfer
DI
615T[s]
Key address (63H) Serial data transfer
Key address
1
T= fosc
DO
Key data read
Key data read
Key data read request
Key data read request
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.
No. 7632-11/16
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LC75700T.PDF ] | |
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