The HT3670C itself has an extensive range of 18 instruments and is infused with 36 rhythms to provide a special amount of audible compliance, as well as volume keying for easy adjustment of the beat. In addition to replay and demo key functions, this high-quality CMOS VLSI also provides external key pad adjustment and control of internal audio processing circuitry. The HT3670 embeds a full-featured 8-bit microcontroller, providing control over versatile and versatile audio output. The audio output is provided by a 4-channel electronic Tone Synthesizer (ETS) and a 2-channel audio processing circuit.
2 internal structure and packaging
HT3670C internal circuit mainly includes microcontroller, control register, splitter, 4-channel electronic tone synthesizer, 2-channel audio generator, multiplier and digital-to-analog converter (DAC) audio output/processing (OIP) circuit, etc. The block diagram is shown in Figure 1.
The HT3670 is available in a 40-pin DIP package with pinouts as shown in Figure 2. Table 1 shows the pin function description.
Table 1 pin and solder joint function description
3 Features and functions
3.1 Main features
Electronic drum circuit TH3670C and application
The main features of the HT3670C are as follows:
â— Low operating voltage (VDD): 3.3V ~ 5.2V;
â—High system frequency (fosc): 3.58MHz;
â— Adopt RC type oscillator;
â— Low standby current (ISTB): 2Î¼A (typical);
â— has three 8-bit D/A audio output;
â— Embedded "Holtek" 8-bit microcontroller;
â— With four channel melody processing and two channel audio processing capabilities;
â— Adopt eight-level master volume control;
â— Use power on/off to indicate the score;
â— Automatically cut off the alarm sound in 2 minutes;
â— has 36 rhythms and 18 tapping effects;
â— With two 7-segment LED drive capability;
â— The beat is adjustable.
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