General Description

These devices provide a combination of a fully featured MCU plus an RF transmitter function, giving

them great flexibility for use in wide range of wireless I/O control applications such as industrial

control, consumer products, subsystem controllers, etc.

Analog features include a multi-channel 12-bit A/D converter. Multiple and extremely flexible

Timer/Event Counters provide full timing functions. Protective features such as an internal Watchdog

Timer and Low Voltage Reset coupled with excellent noise immunity and ESD protection ensure that

reliable operation is maintained in hostile electrical environments. An extensive choice of oscillator

functions are provided including a fully integrated system oscillator which requires no external

components for its implementation. The ability to operate and switch dynamically between a range of

operating modes using different clock sources gives users the ability to optimise microcontroller

operation and minimise power consumption. The devices also include flexible I/O programming

features Time-Base functions and a range of other features.

The RF transmitter is a high performance and easy to use transmitter operating in the 300MHz to

450MHz frequency band. One only needs to add a crystal reference frequency, and a limited number of

external components to create a complete and versatile RF transmitter system. The device is capable of

delivering more than +9 dBm into a 50

W load. Such a power level enables a small form factor

transmitter to operate near the maximum limit of the transmission regulations. The device can operate

with ASK - Amplitude Shift Keying, and OOK - On-Off Keying, UHF receiver types from wide-band

super-regenerative radios to narrow-band, high performance super-heterodyne receivers. The data rate

is higher than 10kbps, allowing the device to support more complicated control protocols.

For enhanced power saving, the device includes a data tracking function. The data tracking function

enables the PLL to be activated as long as high transient data input trigger signals are received. The

PLL will also be automatically switched off if there are no data input transients for a time exceeding

approximately 300ms. As the RF Transmitter will also generate a synchronising signal, the MCU can

use its internal RC clock rather than using an additional crystal for the MCU system clock. These

features add up to ensure that the devices can offer excellent capabilities in terms of functionality and

power-saving as well as being highly cost effective in a huge range of remote wireless applications

Selection Guide

Most features are common to all devices, the main feature distinguishing them are Memory capacity

and A/D converter. The following table summarises the main features of each device.

Part No.

Program

Memory

Data

Memory

Data

EEPROM

I/O

External

Interrupt

A/D

Converter

Timer

Module

Comparator

RF

Transmitter

Stack Package

HT68F03T3

1K

´14

64

´864´87

1

¾

10-bit CTM

´1

10-bit STM

´1

¾

Ö

4

16NSOP

HT66F03T3

1K

´14

64

´864´8

7

1

12-bit

´4

10-bit CTM

´1

10-bit STM

´1

12-bit

´4

Ö

4

16NSOP

Rev. 1.30

2

July 4, 2011

HT66F03T3/HT68F03T3

8-Bit Flash MCU with RF Transmitter