Rev 1.00

March 22, 2010

2

HT45B0K

SPI to USB Bridge

Pin Assignment

S D I

N C

S C K

S C S

C L K I

I N T

V S S

N C

H T 4 5 B 0 K

1 6 N S O P - A

S D O

N C

V 3 3 O

U D P

U D N

V D D

V D D

V S S

1 6

1 5

1 4

1 3

1 2

1 1

1 0

9

1

2

3

4

5

6

7

8

Pin Description

Pin Name

I/O

Descriptions

SDI

I

Serial I/O data input

SDI is high impedance when

= HIGH

SDO

O

Serial I/O data output.

SDO is high impedance when

= HIGH

SCK

I

Serial I/O clock input

SCK is high impedance when

= HIGH

I

Serial I/O Chip select input, low active

Connected to internal pull-high resistor.

CLKI

I

External clock input

O

Interrupt output - CMOS output structure

Connected to the external interrupt input of MCU

A USB related interrupt will generate a low pulse signal on this line

V33O

─

3.3V regulator output

UDP

I/O

USBD+ line

USB function is controlled by software control register.

UDN

I/O

USBD- line

USB function is controlled by software control register.

VDD

─

Positive power supply

VSS

─

Negative power supply, ground

NC

─

No connection

Absolute Maximum Ratings

Storage Temperature.................................................................................................−50°C to +150°C

Operating Temperature.................................................................................................−40°C to +85°C

Total Power Dissipation..............................................................................................................10mW

These are stress ratings only. Stresses exceeding the range specified under “Absolute Maximum

Ratings” may cause substantial damage to the device. Functional operation of this device at other

conditions beyond those listed in the specification is not implied and prolonged exposure to extreme

conditions may affect device reliability.

Note :