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ADXL180 Folha de dados(PDF) 2 Page - Analog Devices |
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ADXL180 Folha de dados(HTML) 2 Page - Analog Devices |
2 / 56 page ADXL180 Rev. 0 | Page 2 of 56 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 3 Specifications..................................................................................... 4 Absolute Maximum Ratings............................................................ 7 ESD Caution.................................................................................. 7 Pin Configuration and Function Descriptions............................. 8 Terminology ...................................................................................... 9 Theory of Operation ...................................................................... 10 Overview...................................................................................... 10 Acceleration Sensor.................................................................... 10 Signal Processing ........................................................................ 11 Digital Communications State Machine ................................. 11 2-Wire Current Modulated Interface....................................... 11 Synchronous Operation and Dual Device Bus....................... 11 Programmed Memory and Configurability............................ 11 Physical Interface............................................................................ 13 Application Circuit..................................................................... 13 Current Modulation................................................................... 13 Manchester Data Encoding....................................................... 14 Operation at Low VBP or Low VDD............................................ 14 Operation at High VDD............................................................... 14 Communications Timing and Bus Topologies ........................... 15 Asynchronous Communication ............................................... 15 Synchronous Communication.................................................. 15 Synchronous Communication Mode—Dual Device............. 17 Data Frame Definition................................................................... 21 Data Frame Transmission Format............................................ 21 Data Frame Configuration Options......................................... 21 Acceleration Data Coding ......................................................... 23 State Vector Coding ................................................................... 24 State Vector Descriptions .......................................................... 24 Transmission Error Detection Options................................... 25 Application Layer: Communication Protocol State Machine... 26 ADXL180 State Machine ........................................................... 26 Phase 1: Power-on-Reset Initialization.................................... 26 Phase 2: Device Data Transmission ......................................... 26 Phase 2: Mode Description ....................................................... 28 Phase 3: Self-Test Diagnostic .................................................... 35 Phase 4: Auto-Zero Initialization............................................. 38 Phase 5: Normal Operation ...................................................... 38 Signal Range and Filtering ............................................................ 39 Transfer Function Overview..................................................... 39 Range............................................................................................ 39 Three-Pole Bessel Filter ............................................................. 39 Auto-Zero Operation................................................................. 39 Error Detection............................................................................... 41 Overview ..................................................................................... 41 Parity Error Due to Communications Protocol Configuration Bit Error....................................................................................... 41 Self-Test Error............................................................................. 42 Offset Error/Offset Drift Monitoring...................................... 42 Voltage Regulator Monitor Reset Operation .......................... 42 Test and Diagnostic Tools ............................................................. 43 VSCI Signal Chain Input Test Pin .............................................. 43 VSCO Analog Signal Chain Output Test Pin ............................ 43 Configuration Specification.......................................................... 44 Overview ..................................................................................... 44 Configuration Mode Transmit Communications Protocol.. 45 Configuration Mode Command (Receive) Communications Protocol........................................................................................ 46 Configuration Mode Communications Handshaking .......... 47 Configuration and User Data Registers .................................. 48 Configuration Mode Exit .......................................................... 48 Serial Number and Manufacturer Identification Data Registers....................................................................................... 48 Programming the Configuration and User Data Registers .. 48 OTP Programming Conditions and Considerations ............ 49 Configuration/User Register OTP Parity................................ 49 Configuration Mode Error Reporting..................................... 49 Configuration Register Reference ................................................ 50 UD[7:0] User Data Bits.............................................................. 51 UD8 Configuration Bit.............................................................. 51 BDE .............................................................................................. 51 SCOE............................................................................................ 51 FDLY ............................................................................................ 51 ADME.......................................................................................... 51 STI ................................................................................................ 51 FC[1:0] ......................................................................................... 51 |
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