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MC34216A bảng dữ liệu(PDF) 8 Page - Motorola, Inc |
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MC34216A bảng dữ liệu(HTML) 8 Page - Motorola, Inc |
8 / 20 page MC34216A 8 MOTOROLA ANALOG IC DEVICE DATA PIN FUNCTION DESCRIPTION (continued) Pin Description Symbol 21 VCC Supply Voltage 22 Gnd Large Signal Ground 23 LPO Loudspeaker Amplifier Output 24 LPI Loudspeaker Amplifier Input 25 RXI Receive Amplifier Input 26 RXO1 Receive Amplifier Output 27 RXO2 Receive Amplifier Output 28 AGC Loudspeaker AGC Timing CIRCUIT DESCRIPTION Concept With the MC34216A, a microcontroller and a switched mode power supply, a telephone set with listening–in function and ringing via loudspeaker can be built as shown in Figure 1. In off–hook position, the application is in speech mode. The line current flows through transistor T2 and supplies the application at the supply point VCC which is stabilized by the MC34216A. The Vline, Iline characteristic is programmed by the microcontroller and adjusted by the external components Z0, Z1, Z21 and R1 which are in a regulator loop, acting on transistor T2. The ac impedance is generated in a similar way. Handset and loudspeaker can be connected directly to the MC34216A to perform handset and listening–in operation. Via the bus, the microcontroller programs the MC34216A to perform the DTMF/pulse–dialing and supervise the device. The user keyboard has to be connected to the microcontroller. In on–hook position, the SMPS supplies the application in presence of a ringing signal. The microcontroller programs the MC34216A and a ringing melody can be generated via the loudspeaker. The block diagram of the MC34216A (see Figure 2), shows the basic blocks of the device plus the essential external components. R1 Micro MC34216A T2 Z0 Z1 Z21 A/B Hookswitch VCC Gnd SMPS Loudspeaker Handset Figure 1. Telephone Concept with MC34216A |
Số phần tương tự - MC34216A |
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Mô tả tương tự - MC34216A |
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