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Analog telephonecCircuittelephone circuit and TEA1062

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JRE
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Analog Telephone Circuit &telephonecCircuit and TEA1062

I am currently working on a Analog Telephonean analog telephone project and.

I have some questions. ICs

ICs and Central are below;below:

  1. Central: KX-NS500 (Givesgives 28VDC)
  2. DTMF Receiverreceiver: MT8870
  3. DTMF Generatorgenerator: HT9200B
  4. MCU: STM32WB10CCU5
  5. Line Mng. IC: TEA1062AT
  6. Power IC: 3V3 Fixedfixed SMPS

Below is my circuit diagram with some details;

  1. DTMF Receiver enter image description herereceiver

enter image description here

Here is the DTMF receiver with MT8870 IC. I buildbuilt the transistor circuits because the datasheet says the IC's typical Vdd = 5.0V however it works fine with 3V3.

  1. DTMF Generator
    enter image description heregenerator

enter image description here

Here is Tone Generator Circuitthe tone generator circuit. It is workingworks in parallel mode.

  1. MCU enter image description here

enter image description here

Here is MCU circuit diagram. Some Keypadskeypads and GPIOs.

  1. Line (TEA1062AT)!!!

enter image description here

Here are the TEA1062AT & Line Connectionand line connection. J2 stands for "Hook Switch" and J3 for "Line Input". Here

Here I have some problems. 

First of all, when I supply all other ICs (Receiverreceiver, Generatorgenerator, MCU) with 3V3 from Power Supplythe power supply (Isolatedisolated from the TEA1062AT's Vcc) all of them workswork fine. I can send and receive DTMF tonetones. But when

When I try to supply using the TEA1062At VCC pin, (Datasheetthe datasheet says you can use this pin to supply peripherals,)current the current from this pin is not being enough. 

When I upload empty code to MCU, I have stable 3.32V @VCC from TEA. (VCC_Line Netnet) but when I try to send and receive some datasdata from the MCU to Generatorthe generator and Receiverreceiver, that 3.32V oscillateoscillates. I tried to increase the current capability by lowerindlowering R114 and by inrceasingincreasing R93. It did not work. 

Then I tried get fixed fixed 3V3 voltage by using the circuit below. :

enter image description here
I

I take supply for this circuit from after R87  (Voltagevoltage drop here is Aprox.approximately 9V,). It works. This time II could not get the DTMF tone from TEA1062 Line Pinline pin.

Ok. Any way to supply all peripherals without/with TEA1062AT? How to interface with Central - TEA1062 IC? What is wrong in these circuit?

Thank you.

  • Is there any way to supply all peripherals without/with TEA1062AT?
  • How can I interface with Central - TEA1062 IC?
  • What is wrong in these circuits?

Analog Telephone Circuit & TEA1062

I am currently working on a Analog Telephone project and I have some questions. ICs and Central are below;

  1. Central: KX-NS500 (Gives 28VDC)
  2. DTMF Receiver: MT8870
  3. DTMF Generator: HT9200B
  4. MCU: STM32WB10CCU5
  5. Line Mng. IC: TEA1062AT
  6. Power IC: 3V3 Fixed SMPS

Below is my circuit diagram with some details;

  1. DTMF Receiver enter image description here

Here is the DTMF receiver with MT8870 IC. I build the transistor circuits because datasheet says IC's typical Vdd = 5.0V however it works fine with 3V3.

  1. DTMF Generator
    enter image description here

Here is Tone Generator Circuit. It is working in parallel mode.

  1. MCU enter image description here

Here is MCU circuit diagram. Some Keypads and GPIOs.

  1. Line (TEA1062AT)!!!

enter image description here

Here are the TEA1062AT & Line Connection. J2 stands for "Hook Switch" and J3 for "Line Input". Here I have some problems. First of all, when I supply all other ICs (Receiver, Generator, MCU) with 3V3 from Power Supply (Isolated from TEA1062AT's Vcc) all of them works fine. I can send and receive DTMF tone. But when I try to supply using TEA1062At VCC pin, (Datasheet says you can use this pin to supply peripherals)current from this pin is not being enough. When I upload empty code to MCU, I have stable 3.32V @VCC from TEA. (VCC_Line Net) but I try to send and receive some datas from MCU to Generator and Receiver, that 3.32V oscillate. I tried to increase current capability by lowerind R114 and by inrceasing R93. It did not work. Then I tried get fixed fixed 3V3 voltage by using circuit below. enter image description here
I take supply for this circuit from after R87(Voltage drop here is Aprox. 9V). It works. This time I could not get the DTMF tone from TEA1062 Line Pin.

Ok. Any way to supply all peripherals without/with TEA1062AT? How to interface with Central - TEA1062 IC? What is wrong in these circuit?

Thank you.

Analog telephonecCircuit and TEA1062

I am currently working on an analog telephone project.

I have some questions.

ICs and Central are below:

  1. Central: KX-NS500 (gives 28VDC)
  2. DTMF receiver: MT8870
  3. DTMF generator: HT9200B
  4. MCU: STM32WB10CCU5
  5. Line Mng. IC: TEA1062AT
  6. Power IC: 3V3 fixed SMPS

Below is my circuit diagram with some details;

  1. DTMF receiver

enter image description here

Here is the DTMF receiver with MT8870 IC. I built the transistor circuits because the datasheet says the IC's typical Vdd = 5.0V however it works fine with 3V3.

  1. DTMF generator

enter image description here

Here is the tone generator circuit. It works in parallel mode.

  1. MCU

enter image description here

Here is MCU circuit diagram. Some keypads and GPIOs.

  1. Line (TEA1062AT)!!!

enter image description here

Here are the TEA1062AT and line connection. J2 stands for "Hook Switch" and J3 for "Line Input".

Here I have some problems. 

First of all, when I supply all other ICs (receiver, generator, MCU) with 3V3 from the power supply (isolated from the TEA1062AT's Vcc) all of them work fine. I can send and receive DTMF tones.

When I try to supply using the TEA1062At VCC pin (the datasheet says you can use this pin to supply peripherals,) the current from this pin is not being enough. 

When I upload empty code to MCU, I have stable 3.32V @VCC from TEA. (VCC_Line net) but when I try to send and receive some data from the MCU to the generator and receiver, that 3.32V oscillates. I tried to increase the current capability by lowering R114 and by increasing R93. It did not work. 

Then I tried get fixed fixed 3V3 voltage by using the circuit below:

enter image description here

I take supply for this circuit from after R87  (voltage drop here is approximately 9V,) It works. This time I could not get the DTMF tone from TEA1062 line pin.

Ok.

  • Is there any way to supply all peripherals without/with TEA1062AT?
  • How can I interface with Central - TEA1062 IC?
  • What is wrong in these circuits?
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Firat Dagkiran
Firat Dagkiran
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Analog Telephone Circuit & TEA1062

I am currently working on a Analog Telephone project and I have some questions. ICs and Central are below;

  1. Central: KX-NS500 (Gives 28VDC)
  2. DTMF Receiver: MT8870
  3. DTMF Generator: HT9200B
  4. MCU: STM32WB10CCU5
  5. Line Mng. IC: TEA1062AT
  6. Power IC: 3V3 Fixed SMPS

Below is my circuit diagram with some details;

  1. DTMF Receiver enter image description here

Here is the DTMF receiver with MT8870 IC. I build the transistor circuits because datasheet says IC's typical Vdd = 5.0V however it works fine with 3V3.

  1. DTMF Generator
    enter image description here

Here is Tone Generator Circuit. It is working in parallel mode.

  1. MCU enter image description here

Here is MCU circuit diagram. Some Keypads and GPIOs.

  1. Line (TEA1062AT)!!!

enter image description here

Here are the TEA1062AT & Line Connection. J2 stands for "Hook Switch" and J3 for "Line Input". Here I have some problems. First of all, when I supply all other ICs (Receiver, Generator, MCU) with 3V3 from Power Supply (Isolated from TEA1062AT's Vcc) all of them works fine. I can send and receive DTMF tone. But when I try to supply using TEA1062At VCC pin, (Datasheet says you can use this pin to supply peripherals)current from this pin is not being enough. When I upload empty code to MCU, I have stable 3.32V @VCC from TEA. (VCC_Line Net) but I try to send and receive some datas from MCU to Generator and Receiver, that 3.32V oscillate. I tried to increase current capability by lowerind R114 and by inrceasing R93. It did not work. Then I tried get fixed fixed 3V3 voltage by using circuit below. enter image description here
I take supply for this circuit from after R87(Voltage drop here is Aprox. 9V). It works. This time I could not get the DTMF tone from TEA1062 Line Pin.

Ok. Any way to supply all peripherals without/with TEA1062AT? How to interface with Central - TEA1062 IC? What is wrong in these circuit?

Thank you.