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ASI4UE-G1-SR Datasheet(PDF) 11 Page - Integrated Device Technology |
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ASI4UE-G1-SR Datasheet(HTML) 11 Page - Integrated Device Technology |
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11 / 70 page  ASI4U / ASI4U-E / ASI4U-F Datasheet © 2016 Integrated Device Technology, Inc. 11 January 26, 2016 3 Basic Functional Description 3.1. Functional Block Diagram Figure 3.1 ASI4U Functional Block Diagram TRANSMIT DIGITAL LOGIC ASI4U/ASI4U-E/ASI4U-F AGND LGND DI(3:0) DSR PST P(3:0) UIN UOUT U5R OSC1 CAP ASIP ASIN OVER- HEAT P - PULSE N - PULSE REC- RESET SEND-D SEND- SBY INPUT STAGE I/O STAGE OUTPUT STAGE INPUT STAGE CMOS INPUT STAGE AC CURRENT INPUT DATA- STRB RESET PARAM STRB ELECTRONIC INDUCTOR IRD_IN ANA DIG OVER- LOAD FID LED2 LED1 IRD GND 0V INPUT STAGE OUTPUT STAGE OSC2 OUTPUT STAGE OUTPUT STAGE DO(3:0) RECEIVE OSCILLATOR POWER SUPPLY THERMAL / OVERLOAD PROTECTION Following device functions are associated with the different blocks of the IC: RECEIVE The RECEIVE block converts the analog telegram waveform from the AS-i bus to a digital pulse- coded signal that can be processed further by a digital UART circuit. The RECEIVE block is directly connected to the ASIP and ASIN pins, which connect to the AS-i line. It converts the differential AS-i telegram to a single-ended signal and removes the DC offset by high-pass filtering. To adapt quickly to changing signal amplitudes in telegrams from different network users, the amplitude of the first telegram pulse is measured by a 3-bit flash ADC and the threshold of a positive and a negative comparator is set accordingly to about 50% of the mea- sured level. The comparators generate the P-pulse and N-pulse signals. |
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