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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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UCD3028RMHT bảng dữ liệu(PDF) 52 Page - Texas Instruments |
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UCD3028RMHT bảng dữ liệu(HTML) 52 Page - Texas Instruments |
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52 / 81 page  UCD3040 UCD3028 UCD3020 SLUS868H – DECEMBER 2009 – REVISED OCTOBER 2013 www.ti.com PMBus Address Detection The PMBus needs six address bits to uniquely identify devices on the bus, where two physical ADC pins have been assigned to decode the address. Thus, each pin is capable of resolving one of eight possible states for decoding three bits. For address detection, the 10- μA current sources must be enabled in the PMBUS trim register for driving current out of channels 0 and 1. Where resistors are connected to ground for producing a voltage in the range from 0.25 V to 2 V, resulting in 0.25 V-per-address-bit steps. Grounded inputs or open pins then result in nonvalid states. Then an ADC conversion can be performed on those channels for detecting the address. The resistor values shown in the table are 1% EIA standard values. RESISTOR VALUE PIN VOLTAGE Addr. VALUE Open Vdd Invalid 200 k Ω 2 V 111 174 k Ω 1.74 V 110 150 k Ω 1.5 V 101 124 k Ω 1.24V 100 100 k Ω 1 V 011 75 k Ω 0.75 V 010 49.9 k Ω 0.5 V 001 24.9 k Ω 0.25 V 000 Ground 0 V Invalid Table 7. Analog Input Mapping to ADC12 CHANNEL NO. INTERNAL/EXTERNAL SIGNALS DESCRIPTION Ch-31 AD-15 Ch-30 AD-15 Loop 4 test signals Ch-29 AD-15 Ch-28 AD-15 Ch-27 AD-15 Ch-26 AD-15 Loop 3 test signals Ch-25 AD-15 Ch-24 AD-15 Ch-23 AD-15 Ch-22 AD-15 Loop 2 test signals Ch-21 AD-15 Ch-20 AD-15 Ch-19 AD-15 Ch-18 AD-15 Loop 1 test signals Ch-17 AD-15 Ch-16 AD-15 Ch-15 Temp sensor Internal temperature sensor Ch-14 AD-14 GP analog input to ADC12 Ch-13 AD-13 GP analog input to ADC12 Ch-12 AD-12 GP analog input to ADC12 Ch-11 AD-11 GP analog input to ADC12 Ch-10 AD-10 GP analog input to ADC12 Ch-9 AD-09 GP analog input to ADC12 Ch-8 AD-08 GP analog input to ADC12 Ch-7 AD-07 GP analog input to ADC12 Ch-6 AD-06 GP analog input to ADC12 Ch-5 AD-05 GP analog input to ADC12 52 Submit Documentation Feedback Copyright © 2009–2013, Texas Instruments Incorporated Product Folder Links: UCD3040 UCD3028 UCD3020 |
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