HL5916 (Pressure Key)

GENERAL DESCRIPTION

HL5916 is an integrated circuit used to detect voltage variation of a sensor built in IC. The circuit can detect a very small voltage variation between two input pins of the sensor. The voltage variation can be as small as 0.25mv, and the offset voltage can be as large as 200mv. A voltage regulator is built to provide the power supply for the sensor to reduce the effect of the noise from power supply. Besides, there is a capacitive sensor circuit designed in the IC to enlarge the application field.

FEATURES

  • Low power consumption
  • High sensitivity
  • Auto offset voltage compensation
  • High noise rejection
  • Twin function: pressure gauge amplifier and touch detector
  • Built in sensor

ABSOLUTE MAXIMUM RATING

Supply Voltage (VDD to VSS) -------------------------  6V
Input Voltage Range              -------------------------    (VSS - 0.3V) to (VDD + 0.3V)
Operating Temperature Range -------------------------    0℃ to +60℃

 

ELECTRICAL CHARACTERISTICS

(VDD3=4.5V, VDD2=4.5V, VDD=3.3V, GND=0V, Ta=+25℃)


PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS
Operating Voltage   3.0 3.3 5.5 V
Standby Current 1 ENBA = 0，ENBP=0   0.1   uA

Operating Current

(Internal Regulator)

ENBA = 1，ENBP=1

SCL,SDA,PRDSN pull high 100KΩ		   410     uA

Operating Current

(Internal Regulator)

ENBA = 1，ENBP=1

SCL,SDA,PRDSN pull high 10KΩ

  550    uA
KEYO driver current VDD2=4.5V  3.5    5 mA
KEYO driver current VDD2=3.3V     2.5 mA

 

OPERATION OF THE SYSTEM

HL5916 is programmed for serial interface with micro-controller .The instruction data is transferred via a pair of serial data with latch clock input pins at the same time. Data is input from SDA and SCL pins.
Before the operation of the system, a high pulse (>20us) must be send to the MRST pin and parameters must be sent to IC.

TYPICAL APPLICATION CIRCUIT I   (INTERNAL REGULATOR)

 

TYPICAL APPLICATION CIRCUIT II   (Multi-Key)