FD168Y

FD168H

Rev1.1 Apr. 23, 2009’

P.2 / FD168Y_FD168H

FEELING

TECHNOLOGY

Pin Connection

Figure.2

Pin Descriptions

Name

I/O

FD168Y

FD168H

Description

VDD

P

1

1

Positive power supply

VSS

G

3

2

Ground

NO

O

2

3

Driver output

Legend: I=input, O=output, I/O=input/output, P=power supply, G=ground

Functional Descriptions

Refer to the block diagram (Figure.1), FD168Y/FD168H is composed of the following building blocks:

Bias Generator

The bias generator provides precise, temperature- and process-insensitive bias references for the analog blocks.

These references guarantee proper operation of the chip under all conditions specified in this specification.

Oscillator

Built-in oscillator provides the clock signal.

Power on Reset

Used to detect the power-up ramp and reset the digital circuits to attain correct operation as soon as the power is

ready.

Chopper Amplifier

To achieve a higher magnetic sensitivity the chopper amplifier structure is adopted in this design. Use of this

structure dynamically removes both the offset and flicker noise at the same time.

Digital control logics

To generate an output switching signal from the chopper amplifier.

NO

VSS

VDD

1

2

3

Top

View

3

1

2

Mark

Side

FD168Y

FD168H