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KBDSER56 Datasheet(PDF) 6 Page - ABCircuits

Part # KBDSER56
Description  Serial output encoder keyboards up to 56 switches
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Manufacturer  ABCIRCUITS [ABCircuits]
Direct Link  http://www.abcircuits.com
Logo ABCIRCUITS - ABCircuits

KBDSER56 Datasheet(HTML) 6 Page - ABCircuits

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Turning Ideas Into Reality
ABCircuits www.abcircuits.com POB 123 New Hill NC 27562 (919) 290-7104
Part Number KBDSER56
January 2013 Page 6 of 7
DC Electrical Characteristics
Symbol
Description
Min
Typical
Max
Units
Notes
Vdd
Supply Voltage
2.4
5.25
V
Idd
Supply Current
2
8
mA
Vdd = 5V
Voh
High Output Level
Vdd - 1.0
V
Ioh=10 mA
Vol
Low Output Voltage
0.75
V
Iol=25 mA
Vih
Input High Level
2.1
V
Vil
Input Low Level
0.8
V
Ioh
High Level Source Current
10
mA
Iol
Low Level Sink Current
25
mA
Cio
Capacitive load
3.5
10
pF
Iil
Input leakage
1
nA
Rpu
Pull Up Resistors On Row Inputs
4
5.6
8
k?
Theory Of Operation
The KBDSER56 IC is a custom programmed microprocessor designed to encode keyboards and
provide a serial output. The open drain COLX pins are pulsed low one at a time, and the ROWY
pins are sampled to check for key switch closures. If a key is detected, scanning stops until the
key is released. The pressed key is encoded to ASCII and transmitted in standard asynchronous
format on the SOUT key. The key is transmitted using 8 data bits, 1 stop bit and no parity. Baud
rate is 9600 BPS. When the key is released scanning continues.


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