HL6216 Decode with Westminster Chime Door Bell (Tube-Bell)

Westminster Chime Door Bell (Tube-Bell) - 4 notes

Westminster Chime Door Bell (Tube-Bell) - 8 notes


HL6216 is a monolithic CMOS IC designed specially for doorbell. In order to reduce the cost of doorbell, HL6216 consists of a preamplifier, a decoder, a melody generator, a speech synthesizer and a power amplifier. The speech synthesizer uses high sampling rate and DSP technology to obtain high quality sound. The decoder has 10 address bits and 2 data bits or 8 address bits and 4 data bits, which can be selected by bonding option (SO16 pin). When 2 data bits are used, 4 different songs or chimes can be chosen by the data bit of transmitter. When 4 data bits is used, 16 different songs or chimes can be chosen. The sound of HL6216 simulates the sound of tube-bells. But HL6216 series can also simulate many other kinds of instrument, because it uses speech synthesizer to generate sound.

The HL6216 can accept the signal generated by HT-12E or PTC 2262. During the standby state, the only consumption current is for preamplifier circuit, which is about 20uA. There is an activation protection circuit designed in HL6216. The logic circuit will not activated by noise. The power amplifier of HL6216 is designed as a class B amplifier. The current of the whole chip when speaker ON is about 20mA (VDD = 3V) or about 40mA (VDD = 4.5V).

When used as an AC type doorbell, a 1uf capacitor (or 2uf capacitor) can fee the power from AC power line. When 1uf capacitor is used, the working voltage of the system is about 3V. When 2uf capacitor is used, the working voltage of the system is about 4.5V. There is a working voltage select pin. If this pin is connected to VDD, the working voltage is 3V. If this pin is connected to VSS, the working voltage is 4.5V. The power amplifier is an OTL type power amplifier. The speaker can be connected to the output through a 200uf capacitor.

In HL6216, there are four VDD PAD and three VSS PAD. Preamplifier and power amplifier use separated power terminal, and the interference can be reduced to minimum.


  • IR or RF remote control
  • Class B power amplifie
  • Pre-amplifier, decoder, melody generator, speech synthesizer and power amplifier built-in
  • Low power consumption
  • Low stand-by current
  • 3V or 4.5V working voltage
  • HT12 or PTC 2262 compatible
  • High quality timber of tube-bell
  • Timber programmable by ROM code
  • Low noise 

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1 POUT Output of power amplifier
2 VSSP Negative power supply terminal of power amplifier
3 INF Inverting input terminal of power amplifier
4 IP Non-inverting input terminal of power amplifier
5 IOUT Output of D / A converter
6 COM Common voltage
7 DATA DATA from the output of preamplifier.
8 VDDA Positive power-supply terminal of D/A converter.
9 V3 Power-supply select pin. When connected to VDD, 3V working voltage is chosen
10 VDD Positive power-supply terminal of logic circuit.
11 SLSO1 Select pin of song bank.
12 OSCB1 Oscillator pin of decoder.  The frequency depends or the frequency of HT-12 or PTC-2262
13 OSCB2 Oscillator pin of decoder.
14~15 OSC1,OSC2 Oscillator circuit pin of sound generator
16 DIODE Connect a 1N4148 diode to VSS
17 SLSONG2 Select pin of song bank
18 SL62 When connected to VDD, compatible with PTC2262 When connected to VSS, compatible with HT-12
19 SO16 Connect to VSS, four songs will be selected. W hen connected to VDD, 16 songs will be select.
19 A9~A8 Address or DATA pin;  Address pin if SO16 = VSS DATA pin if SO16 = VDD; Left floating when SO16 = VDD
22~29 A7~A0 Address pin
30 VSS Digital ground
31 VSSA Power ground of D/A converter.
32 VSSO Power ground of preamplifier.
33 IP1 Non-inverting input of 1st stage preamplifier
34 IN1 Inverting input of 1st stage preamplifier
35 OUT Output of 1st stage preamplifier
36 N.C.  
37 IN2 Inverting input of 2nd stage preamplifier
38 VDDO Positive power supply terminal of preamplifier
39 VDDP Positive power supply terminal of power amplifier
40 N.C.  

Application circuit


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