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MC34216ADWF bảng dữ liệu(PDF) 10 Page - Motorola, Inc |
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MC34216ADWF bảng dữ liệu(HTML) 10 Page - Motorola, Inc |
10 / 20 page MC34216A 10 MOTOROLA ANALOG IC DEVICE DATA Z21 T3 T2 Z1 C12 RX Z0 R5 V C7 2V 1.4 V V Line + HYN LAI SAO NDC SAI LAO Line – Gnd I2 R1 MC34216A C16 2.4 V IMP CM G CC O2 BE VO1 + + + + + + ≈ + + Figure 4. DC Part of the Block Diagram of the MC34216A The transfer from Region 2 to 3 occurs at the point VLK, ILK, which is calculated: VLK + Z1 x I2CD ) 2V BE ) V CD ) V O2 ILK + Z21 Z0 x Z1 x I2CD ) 2V BE ) V CD R1 With : I2CD + I2C ) I2D 2 , and V CD + V C ) V D 2 , and 2V BE [ 1.4 V, V O2 [ 1.1 V When the French or U.K. mask is selected, this transfer takes place for line currents of 30 mA to 40 mA depending on the components settings. With the Startup and Low Voltage mask, the transfer lies outside the normal operating range with line currents of 90 mA or more. In most applications, the transfer from Region 1 to 2 takes place for line currents below 10 mA. With proper settings, Region 4 is only entered during an overload condition. In this mode, the power consumption in the telephone set is limited. In order to detect an overload condition, the voltage between the Pins LAI and SAO is monitored. When the voltage difference is larger than the threshold Vclamp1, the protection is made active. The relation for the line voltage VLP at this point is given as: VLP + Z0 Z21 x V clamp1 ) V CD ) V O2 When the protection mode is entered, the line current is reduced to a lower value ILP of: ILP + V clamp2 ) V O1 – V O2 R1 When the line voltage becomes smaller than VLP, the overload condition is gone and the MC34216A will leave Region 4. The current drawn from the line by the dc part is used to supply the MC34216A and peripheral circuits. The surplus of current is sunk away by the voltage stabilizer at Pin VCC where a reservoir capacitor is connected. The reference for the circuit is Pin Gnd. Startup of the application is ensured by an internal startup circuit. During the startup, the internal registers of the MC34216A are reset, and the reset Pin RS goes high. This signals is meant to indicate to the microcontroller that the programming of the MC34216A can start. When the line current flows, the hook status output Pin D/HS goes high. This serves as the information for the microcontroller that the set is off–hook. When the line current is no longer present, the pin goes low again. Because the line current is monitored, and not the line voltage, an interrupt of the exchange can be recognized. |
Số phần tương tự - MC34216ADWF |
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Mô tả tương tự - MC34216ADWF |
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