HM223B

2015/07/24

Page 4 of 8

Version：1.0

Function Description

Ⅰ

. Sensitivity adjustment

The total loading of electrode size and capacitance of connecting line on PCB can affect the

sensitivity. So the sensitivity adjustment must according to the practical application on PCB. The

HM223B offers some methods for adjusting the sensitivity outside.

1. by the electrode size

Under other conditions are fixed. Using a larger electrode size can increase sensitivity.

Otherwise it can decrease sensitivity. But the electrode size must use in the effective scope.

2. by the panel thickness

Under other conditions are fixed. Using a thinner panel can increase sensitivity. Otherwise it

can decrease sensitivity. But the panel thickness must be below the maximum value.

3. by the value of Cs（please see the down figure）

Under other conditions are fixed. When do not use the Cs to VSS, the sensitivity is most

sensitive. When adding the value of Cs will reduce sensitivity in the useful range

（

1≦Cs≦50pF）.

AHLB

Q

TOG

ELECTRODE

Cs

I

VSS

VDD

VDD

Ⅱ

. Output mode（By TOG、AHLB pin option）

TOG pin：

Direct output or toggle output selection.

AHLB pad：

Output Q active high or active low selection.

Pin Q（CMOS output）option features：

TOG

AHLB

Pin Q option features

0

0

Direct output, CMOS active high

0

1

Direct output, CMOS active low

1

0

Toggle output, power on state = 0

1

1

Toggle output, power on state = 1