Block Diagram

The following block diagram illustrates the dual-chip structure of the devices, where an individual MCU and SPI to USB

chips are combined into a single package.

HT66FB30/HT66FB40/HT66FB50/HT66FB60

Rev. 1.10

3

June 4, 2010

V S S

V D D

V S S

V D D

A n a l o g i n p u t s

O S C p i n s

S C O M p i n s

R E S

T M p i n s

I N T p i n s

V D D

S C K

S D O

S D I

S C S

P I N T

P C K

S C K

S D I

S D O

S C S

I N T

C L K I

V S S U

V S S

I / O p o r t s

U D P

U D N

V 3 3 O

H T 4 5 B 0 K

H T 6 6 F x 0

V S S

V D D

V S S

V D D

A n a l o g i n p u t s

O S C p i n s

S C O M p i n s

R E S

T M p i n s

I N T p i n s

V D D

S C K

S D O

S D I

S C S

P I N T

P C K

S C K

S D I

S D O

S C S

I N T

C L K I

V S S U

V S S

I / O p o r t s

U D P

U D N

V 3 3 O

H T 4 5 B 0 K

H T 6 6 F x 0

V D D U

Internal Chip Interconnection Diagram

Note:

The ground pins of the internal chips are NOT connected together. On some devices the positive power supply

pins are connected together and on some they remain independent.