Holtek HT66F03T3 Manuale utente

HT66F03T3/68F03T3 MCU with 315MHz/433MHz ASK Transmitter

HT66F03T3/68F03T3 MCU with

315MHz/433MHz ASK Transmitter

D/N：AN0220E

General Description

The HT66F03T3/68F03T3 is a Flash type MCU with an RF ASK transmitter function. Data

generated from the MCU will be transmitted at a carrier frequency of 315M/433MHz to a

receiver.

Functions

Complete UHF transmitter

Frequency range of 300MHz to 450MHz

Output power up to 10dBm

Low external part count with minimal external components

Low voltage operation (down to 2.2V)

Diagram

Hardware Diagram Description

Output matching circuit: the following example uses a low pass matching circuit.

KEY PAD: the following example uses PA0~PA3 and PA6~PA7 as switch input pins.

HT66F03T3/68F03T3 MCU with 315MHz/433MHz ASK Transmitter

Application Circuit

The circuit in the frame is the harmonic inhibiting enhancement circuit which can be

ignored if not necessary.

Note: The value in the parentheses is for 433MHz. For example, 433.92MHz the Crystal

Y1 should be 13.56MHz.

Adjust Output Power with External Resistors

R1 in the application circuit is used to adjust the RF output power. In this example, the R1

resistor values for the 50demo board and corresponding typical values of conducted

RF output levels are listed in the table below. R1 in the HT46/48R01T3 demo board uses

a dipole antenna which can be adjusted to an appropriate radiation to meet the

specifications of the design.

Typical IDof PA (mA)Output Power

(dBm) R1() 433MHz 315MHz

10 0 7.8 8.8

3 390 5.0 5.0

0 560 4.0 4.0

HT66F03T3/68F03T3 MCU with 315MHz/433MHz ASK Transmitter

Reference Clock (CREF ) Example

The Clock CREF is provided for IRC frequency calibration of the MCU. It is useful for

devices that require accurate frequencies, such as RTC applications. The following

example demonstrates an RF transmission from PA4 with data received on PA5 and

calibrated by CREF.

;; PA4 is the toggle output pin

;; PA5 is the cref intput pin

;; tmr0 is used to counte cref

;; tmr1 is used to generate toggle

#INCLUDE HT48R01B.INC

CREF_DEMO .section 'data'

CA1_TMP DB 1

CA2_TMP DB 1

GEN1_TMR_TMP DB 1

GEN2_TMR_TMP DB 1

PA5_TMP DB 1

CREF_COUNT DB 1

CREF_DEMO .section at 0 'code'

ORG 00H

JMP MAIN

ORG 08H

JMP TMR0INT

org 0ch

JMP TMR1INT

;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

;~~~~~~~~~~timer0 int

;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

TMR0INT:

SDZ CA1_TMP

JMP POLLIN_PA5

INC CA2_TMP

POLLIN_PA5:

SZ PA5_TMP

JMP HI

LO:

SNZ PA5 ;POLLING PA5 STATUS

JMP NO_CHANGE

SET PA5_TMP

JMP INC_CREF_COUNT

HI:

SZ PA5 ;POLLING PA5 STATUS

JMP NO_CHANGE

CLR PA5_TMP

JMP INC_CREF_COUNT

INC_CREF_COUNT:

SDZ CREF_COUNT

JMP EXIT

CLR ACC

SUBM A,CA1_TMP

HT66F03T3/68F03T3 MCU with 315MHz/433MHz ASK Transmitter

CLR tmr0c.4

JMP EXIT

EXIT:

NO_CHANGE:

RETI

;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

;~~~~~~~~~~timer1 int

;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

TMR1INT:

SDZ CREF_COUNT

RETI

SZ PA4 ;TOGGLE PA4

JMP CLR_PA4

SET PA4

JMP $+2

CLR_PA4:

CLR PA4

MOV A,GEN1_TMR_TMP

MOV CREF_COUNT,A

reti

;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

;~~~~~~~~~~MAIN

;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

MAIN:

;INITIAL I/O

CLR PBC1 ;INITIAL PA4 INTO OUTPUT MODE(dout)

SET PBC0 ;INITIAL PA4 INTO INPUT MODE (cref)

;INITIAL COUNT

CLR PA5_TMP

MOV A,32

MOV CREF_COUNT,A

CLR CA1_TMP

CLR CA2_TMP

;INITIAL TIMER0

mov a,05h ;; enable interupt

mov intc0,a

mov a,82h ;; tmr internal mode

mov tmr0c,a

mov a,236 ;; time base is (256-216)*1us=40us

mov tmr0,a

;INITIAL TIMER1

set et1i ;; enable interupt

mov a,236 ;; time base is (256-216)*1us=40us

mov tmr1,a

mov a,80h ;; tmr internal mode

mov tmr1c,a

SNZ PA5

JMP $-1

SZ PA5

JMP $-1

set tmr0c.4 ;; start tmr

sz CREF_COUNT ;;WAIT COUNTER FINISH

JMP $-1

CLR ET0I ;;Disable the timer 0 interrupt

RLC CA1_TMP ;both ca1_tmp and ca2_tmp are store

HT66F03T3/68F03T3 MCU with 315MHz/433MHz ASK Transmitter

RLC CA2_TMP ;count value of one cycle * 32 ,so

RLC CA1_TMP ;one cycle is CA1_TMP Divided by 32

RLC CA2_TMP ;

RLC CA1_TMP ;

RLC CA2_TMP ;divide 32

;generate one 2.5ms cycle wave

;20us*CA2_TMP=5ms (1/200=5ms)

;tmr1 2.5ms=> 100us*CA2_TMP*2.5/5

;so tmr1= CA2_TMP/2

CLR C

RRC CA2_TMP

RRC CA1_TMP

MOV A,CA1_TMP ;load counter value

MOV GEN1_TMR_TMP,A

MOV A,CA2_TMP

MOV GEN1_TMR_TMP,A

set tmr1c.4 ;; start tmr1 to generate

JMP $

END

Layout Notes

Component Placement

The first consideration for component placement are their signal lines which must be as

short as possible.

In addition to the antenna matching components, the RF PAOUT pin area should avoid

being occupied with components which may influence proper RF operation.

Routing

As right angles more easily accumulate charge, they will have larger discharges which

will influence PCB stability. It is recommended to conduct all routing using 45 degree

bevels or curves.

The distance between tracks should not be less than 6 mils.

The distance between the wires and the apertures should not be less than 6 mils.

The distance between two linked apertures should not be less than 6 mils.

The width of the VCC and GND tracks should not be less than 12 mils.

Each IC power source must have a decoupling capacitor located adjacent to the IC.

The power supply of the RF and the MCU should be independent so as to avoid

interference.

The RF antenna trace should not have a ground plane so as not to affect performance,

as shown in the figure.

Antenna

A typical application is shown in the figure below.

A market available 50SMA plug dipole patch antenna

λ/4 length of copper wire, single-core wire, twisted wire

Cost Down applications

RF antenna Trace width=35mil，FR4 PCB material of 1mm thickness

HT66F03T3/68F03T3 MCU with 315MHz/433MHz ASK Transmitter

Example:

Trace Antenna W: 35mil, L:1500 mil

Layout Top Overlay

Bottom Overlay (mirror)

HT66F03T3/68F03T3 MCU with 315MHz/433MHz ASK Transmitter

Tool Notes

Use the Flash MCU ICE M1001A + D1006A, and select the CFG in the HT68F03 or

HT66F03 to develop the program.

If RF simulation is also required, connect the Holtek 315MHz/433MHz ASK Tx RF Module

to the ICE.

Execute write operations using the e-Writer with Adapter CADP16NSOP-S and

Hope3000 software.

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