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KBDSER56 Datasheet(PDF) 6 Page - ABCircuits |
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KBDSER56 Datasheet(HTML) 6 Page - ABCircuits |
6 / 7 page 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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