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EM83053BH Dataheets PDF



Part Number EM83053BH
Manufacturers ELAN Microelectronics Corp
Logo ELAN Microelectronics Corp
Description KEYBOARD ENCODER
Datasheet EM83053BH DatasheetEM83053BH Datasheet (PDF)

EM83053A/BH KEYBOARD ENCODER GENERAL DESCRIPTION The EM83053A/BH microcontroller is dedicated to a keyboard encoder ,specially designed for IBM PC AT and all compatible machines. The EM83053A/BH controll all scan codes, three LEDs status, scan timing and communications between the keyboard and PC. It is easy to implement a high performance, low cost keyboard with the minimal external components. FEATURES • • • • • • • • • • • • Low cost - eliminate need external components. Phantom key detects.

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EM83053A/BH KEYBOARD ENCODER GENERAL DESCRIPTION The EM83053A/BH microcontroller is dedicated to a keyboard encoder ,specially designed for IBM PC AT and all compatible machines. The EM83053A/BH controll all scan codes, three LEDs status, scan timing and communications between the keyboard and PC. It is easy to implement a high performance, low cost keyboard with the minimal external components. FEATURES • • • • • • • • • • • • Low cost - eliminate need external components. Phantom key detects. RC oscillator ( 1.8432MHz ). Support scan code set 1 ,2 and 3. Support PC AT and PS/2 keyboard . Low power CMOS device technology. Internal pull-up resistor. Tri-state outputs for easy board application. Built-in 4K ROM. Support WINDOWSTM 95, 98, 2000 keys. 104/107 keys with multi-media or other special application keyboard encoder. WINDOWS is registered trademarks of Microsoft corperation. APPLICATION • • • • • • IBM PC AT or compatible machine keyboard. IBM PS/2 model 30,50,60,80 or compatible machine keyboard. Japanese keyboard. Korean keyboard. Brazilian keyboard. European keyboard. PIN ASSIGNMENTS R_OSCI VDD VDD CAPS P90 CLK DATA OSCO GND P90 CLK DATA OSCO GND R_OSCI VDD CAPS 39 38 37 5 4 3 2 1 40 39 38 37 5 4 3 2 1 P91 P92 P93 XT P95 P50 P51 P52 P53 P54 6 7 8 9 10 11 12 13 14 15 EM83053AH 36 35 34 33 32 31 30 29 28 27 NUM SCROLL P67 P66 P65 P64 P63 P62 P61 P60 P91 P92 P93 P94 P95 P50 P51 P52 P53 P54 6 7 8 9 10 11 12 13 14 15 EM83053BH 36 35 34 33 32 31 30 29 28 27 NUM SCROLL P67 P66 P65 P64 P63 P62 P61 P60 16 17 18 19 20 21 22 23 24 25 26 P55 P56 P57 P80 P81 P82 P83 P84 P85 P86 P87 * This specification are subject to be changed without notice. P55 P56 P57 P80 P81 P82 P83 P84 P85 P86 P87 16 17 18 19 20 21 22 23 24 25 26 6.9.2000 1 EM83053A/BH KEYBOARD ENCODER PIN DESCRIPTIONS Symbol P50 P51 P52 P53 P54 P55 P56 P57 P80 P81 P82 P83 P84 P85 P86 P87 P90 P91 VSS SCROLL NUM CAPS P60 P61 P62 P63 P64 P65 P66 P67 CLK DATA VDD OSCO R_OSCI I/O O O O O O O O O O O O O O O O O O O I O O O I I I I I I I I I/O I/O I O I Function Column 3 Low output scan line, 3-state Column 4 Low output scan line, 3-state Column 5 Low output scan line, 3-state Column 6 Low output scan line, 3-state Column 7 Low output scan line, 3-state Column 14 Low output scan line, 3-state Column 13 Low output scan line, 3-state Column 12 Low output scan line, 3-state Column 11 Low output scan line, 3-state Column 15 Low output scan line, 3-state Column 10 Low output scan line, 3-state Column 8 Low output scan line, 3-state Column 9 Low output scan line, 3-state Column 0 Low output scan line, 3-state Column 16 Low output scan line, 3-state Column 17 Low output scan line, 3-state Column 1 Low output scan line, 3-state Column 2 Low output scan line, 3-state Ground Scroll Lock Indicator NUM Lock Indicator Caps Lock Indicator Row 0 Input scan line, internal pull high ( 17KΩ ) Row 1 Input scan line, internal pull high ( 17KΩ ) Row 2 Input scan line, internal pull high ( 17KΩ ) Row 3 Input scan line, internal pull high ( 17KΩ ) Row 4 Input scan line, internal pull high ( 17KΩ ) Row 5 Input scan line, internal pull high ( 17KΩ ) Row 6 Input scan line, internal pull high ( 17KΩ ) Row 7 Input scan line, internal pull high ( 17KΩ ) CLOCK line for IBM communication , internal pull high ( 2.2KΩ ) DATA line for IBM communication , internal pull high ( 2.2KΩ ) +5V Power Supply CLOCK output Connect 51K OHM resistor for 1.8432 MHz oscillation * This specification are subject to be changed without notice. 6.9.2000 2 EM83053A/BH KEYBOARD ENCODER FUNCTION DESCRIPTIONS Keyboard buffer The keyboard will buffer 16 bytes in a first-in-first-out order when the system is able to receive scan codes from the keyboard. The response codes and repeated codes will not be buffered. If keystrokes generate a multiple-byte sequence, the entire sequence must fit into the buffer or the keystroke is discarded and a bufferoverrun condition occurs. Power-on Reset and self test The duration of the keyboard Power-on-Reset(POR) should be within 150 milliseconds and 2 seconds after the power is applied to the keyboard. After executing POR , the keyboard executes a self test. The LEDs are turned on at the beginning and off at the end of the self test. The self test takes a minimum 300 milliseconds and a maximum 500 milliseconds. If the self test is successful, a completion code AA hex is sent to the system and the keyboard starts scanning. If the self test fails, and error code is sent, the keyboard is disabled and waits for a command from the system. The completion codes are sent between 450 milliseconds and 2.5 seconds after POR, and between 300 and 500 milliseconds after a RESET command is acknowledged. Keyboard data output When the keyboard is ready to send data to the system, it first checks clock and data lines. If either one is in the low state, data is stored in the keyboard buffer. If both are in the high state, keyboard starts clocking data out. Data will be va.


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