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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
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Summary of Contents for Holtek HT66F03T3
- Page 1 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 ...
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Page 2: Application Circuit
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. - Page 3 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.
- Page 4 HT66F03T3/68F03T3 MCU with 315MHz/433MHz ASK Transmitter tmr0c.4 EXIT EXIT: NO_CHANGE: RETI ;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ;~~~~~~~~~~timer1 int ;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ TMR1INT: SDZ CREF_COUNT RETI 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...
- Page 5 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=>...
- Page 6 HT66F03T3/68F03T3 MCU with 315MHz/433MHz ASK Transmitter Example: Trace Antenna W: 35mil, L:1500 mil Layout Top Overlay Bottom Overlay (mirror)
- Page 7 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...
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