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HT6523

Holtek Semiconductor Inc
Part Number HT6523
Manufacturer Holtek Semiconductor Inc
Description PS/2 Mouse Controller
Published Mar 26, 2005
Detailed Description HT6523 PS/2 Mouse Controller Features · Compatible with IBM PS/2 mouse · Integrated oscillator circuit with external res...
Datasheet PDF File HT6523 PDF File

HT6523
HT6523

Overview
HT6523 PS/2 Mouse Controller Features · Compatible with IBM PS/2 mouse · Integrated oscillator circuit with external resistor · 6MHz clock frequency · Minimal external components · Three key-switches and four photo-coupler inputs · Supports test mode operation · 16-pin DIP package General Description The HT6523 is a PS/2 compatible mouse controller IC.
Capable of driving up to 3 key-switches and 4 photo-couplers directly into a 6-pin connector line.
Pin Assignment N C 1 2 3 4 5 6 7 8 T E S T R E S E T O S C N C C L K D A T A V S S 1 6 1 5 1 4 1 3 1 2 1 1 1 0 9 V D D Y 2 Y 1 X 2 X 1 L B M B R B H T 6 5 2 3 1 6 D IP -A Pin Description Pin No.
1, 5 2 3 4 6 7 8 9 10 11 12 13 14 15 16 Pin Name NC TEST RESET OSC CLK DATA VSS RB MB LB X1 X2 Y1 Y2 VDD I/O ¾ I I I I/O I/O ¾ No connection If TEST is floating or connected to VSS, then the chip is under normal operation.
If TEST is connected to VDD, it will operate under the TEST mode.
Input to reset internal LSI OSC is connected to an external resistor then to VDD to generate a 6MHz system clock.
Synchronous clock signal.
The mouse generates a clock signal when sending data to and receiving data from the system.
Bidirectional data transmission line Negative power supply, ground In the non-active state these 3 switch inputs are pulled low.
To activate they must be connected to VDD.
In the TEST mode, MB, LB will indicate the condition of the X1, X2 inputs, if RB is left floating or connected to VSS.
Also in the TEST mode, if RB is connected to VDD then MB and LB will indicate the condition of the Y1 and Y2 inputs.
Mouse interface input terminal.
Four photo-coupler signals denote UP, DOWN, LEFT and RIGHT state.
Positive power supply Description I I ¾ Rev.
1.
20 1 March 6, 2003 HT6523 Absolute Maximum Ratings Supply Voltage .
.
VSS-0.
3V to VSS+5.
5V Input Voltage.
.
.
.
VSS-0.
3 to VDD+0.
3V Storage Temperature .
.
.
-50°C to 125°C Operating Temperature...


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