Rev 1.00

March 22, 2010

1

HT45B0K

SPI to USB Bridge

Features

●

Glueless slave SPI interface to Holtek's MCU

●

USB (Universal Serial Bus) 1.1 Full-speed module

− 6 endpoints (endpoint 0 included)

− FIFO: 8, 8, 8, 64, 8, 64 for EP0~EP5 respectively

● 6MHz/12MHz (CLKI) external clock input for USB PLL clock

● Suspend Mode with low suspend current

● Remote Wake-up function

● USB Multiple Interrupt Generation Sources:

♦ Access of the corresponding USB FIFO from the USB host

♦ USB suspend signal from the USB host

♦ USB resume signal from the USB host

♦ USB Reset signal from the USB host

● CMOS external clock input, CLKI, with frequency 6MHz/12MHz for the USB PLL clock

● 16-pin NSOP package

General Description

This device is a companion chip for microcontrollers to provide USB connectivity with the USB

host. Six USB endpoints are supported with 8/8/8/64/8/64-byte FIFO for endpoint 0~5 respectively.

An external interrupt output to the host MCU is used for inetrrupt-driven operation.

However, the host MCU may also poll the status register to obtain the latest status if the interrupt is

not used.

The possible applications include low-cost data links for computers/peripherals, portable and

battery operated devices/instruments, factory automation and process control.

Block Diagram

S D I

S D O

S C K

S C S

C L K I

I N T

V D D

G N D

V 3 3 O

U D P

U D N

4 8 M H z

U S B

M o d u l e

S e r i a l

I / O

I n t e r f a c e

T o a l l

c h i p

p o w e r

P L L