HL5628

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)

GENERAL DESCRIPTION

HL5628 is a multiple point object proximity sensor IC, which can be used to determine position of an object in a keypad matrix, and can be called object position detector.

The sensors of the object position detector are composed of multiple arrays of sensor plates. The key matrix is formed by 7 columns and 4 rows which are connected to the inputs and outputs of HL5628. Each sensor consists of two metal plates, with one plate connected to one of the rows and the other plate connected to one of columns. Maximum of 28 key plates can be formed by this technology.

HL5628 is a mixed mode IC fabricated by CMOS technology. The signal at the keypad is input to sensor processor by column and row scanner and converted to digital data.

In order to expand the number of the keys, maximum of eight IC can be used in one system.

FEATURES

  • Mixed mode integrated circuit
  • Low operating current
  • Parameters can be programmed by external microprocessor
  • Keys of keypad are expandable
  • Built-in regulator circuit

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

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VDD Supply Voltage 3.5 4.5 5.5 V
Standby Current Set HL5628 off   0.2 10 uA
Operating Current fosc = 500kHz   0.6   mA
Oscillation frequency     500   kHz
Input low voltage       0.8 V
Input high voltage   3.5     V
Output low voltage       0.8 V
Output high voltage   3.5     V
Operating Temperature Range   -30   +70

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

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VDD Supply Voltage 2.5 3.0 3.6 V
Standby Current Set HL5628 off   0.2 10 uA
Operating Current fosc = 500kHz   0.4   mA
Oscillation frequency     500   kHz
Input low voltage       0.8 V
Input high voltage   2.4     V
Output low voltage       0.8 V
Output high voltage   2.4     V
Operating Temperature Range   -30   +70

APPLICATION CIRCUIT