HL5808

Patent No.:

  • US 7,023,221 B1 (U.S.A.)
  • I 259908 (R.O.C.)
  • EP 1791260 B1 (EUROPE)
  • ZL 200510080231.9 (CHINA)
  • 特許第4365817号 (JAPAN)
  • US 7,944,217 B2 (U.S.A.)

GENERAL DESCRIPTION

HL5808 is a multiple point object proximity sensor IC, which can be used in a LCD display screen and makes the electrodes in the LCD functions as display electrodes as well as touch sensor electrodes. By using HL5808, a conventional LCD can be used as a display screen and touch screen without any change in the process and structure of the LCD. By using this technology, in the implementation of a LCD touch screen it is not necessary to coat a layer of ITO on top of glass substrate of the LCD.

The HL5808 is designed based on a patent issued and more patents pending technologies.

The sensors of the object position detector are composed of multiple arrays of sensor plates. Electrodes are used to form a display icon (or a pixel) or sensor electrodes. There are 16 output pins in HL5808 and can be used to drive 8 display icons or act as 8 capacitive touch keys.

HL5808 can communicate with external microprocessor through SCL and SDA pins. When a key is touched the READYN pin is activated to LOW state, and which means DATA is ready to be read. SDA and SCL are serial data bus.

In order to expand the number of the keys, multiple numbers of HL5808 can be used in one system. The maximum number of HL5808 can be used in one system is eight. There are address pins ADD2, ADD1 and ADD0 which can be used to identify which HL5808 is chosen by microprocessor.

FEATURES

  • Mixed mode integrated circuit
  • Mixed mode integrated circuit
  • Low operating current
  • Serial digital data bus
  • Parameters can be programmed by external microprocessor
  • Keys of keypad are expandable
  • Built-in regulator circuit
  • Three address pins which can be used to identify HL5808
  • Built-in DATA buffer
  • High temperature variation resistance
  • High noise interference resistance
  • Build-in analog circuit for noise detection

ELECTRICAL CHARACTERISTICS (VDD=4.5, GND=0V, VSL=1, Ta=+25℃)


PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS
VDD Supply Voltage 3.5 4.5 5.5 V
Standby Current MRSTN = GND   0.2   uA
Operating Current NOTE1        
Input low voltage       0.9 V
Input high voltage   3.5     V
Output low voltage I out = 15mA   0.2 0.4 V
Output high voltage I out = 5mA 4.0 4.3   V

ELECTRICAL CHARACTERISTICS (VDD=3V, GND=0V, VSL=0, Ta=+25℃)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS
VDD Supply Voltage 2.5 3.0 5.5 V
Standby Current MRSTN = GND   0.2   uA
Operating Current NOTE1        
Input low voltage       0.9 V
Input high voltage   2.1     V
Output low voltage I out = 10mA   0.2 0.4 V
Output high voltage I out = 3mA 2.4 2.8   V

APPLICATION CIRCUIT I

APPLICATION CIRCUIT II