SX8723E083TRT Semtech

SX8723 ZoomingADC for Pressure and Temperature Sensing ADVANCED COMMUNICATIONS & SENSING Description Features The SX8723 is a data acquisition system based on Up to 16-bit differential data acquisition Semtechs low power ZoomingADC technology. It Programmable gain: (1/12 to 1000) directly connects most types of miniature sensors Sensor offset compensation up to 15 times with a general purpose microcontroller. full scale of input signal 2 differential or 4 single-ended signal inputs With 2 differential inputs, it can adapt to multiple Programmable Resolution versus Speed sensor systems. Its digital outputs are used to bias versus Supply current or reset the sensing elements. 2 digital outputs to bias Sensors Internal or external voltage reference Applications Internal time base Industrial pressure sensing Low-power (250 uA for 16b 500 S/s) Industrial temperature sensing 2-wire interface Barometer Compass Ordering Information Device Package Reel quantity SX8723E083TRT MLPD-W-12 4x4 3000 SX8723E083TDT MLPD-W-12 4x4 1000 1) Available in tape and reel only 2) Lead free, WEEE and RoHS compliant. Functional Block Diagram V1.8 2009 Semtech Corp. www.semtech.com 1 SX8723 ZoomingADC for Pressure and Temperature Sensing ADVANCED COMMUNICATIONS & SENSING Table of Contents Description..............................................................................................................................................................1 Applications............................................................................................................................................................1 Features ..................................................................................................................................................................1 Ordering Information .............................................................................................................................................1 Functional Block Diagram.....................................................................................................................................1 Absolute Maximum Ratings..................................................................................................................................4 Electrical Characteristics ......................................................................................................................................5 ZoomingADC Specifications.................................................................................................................................6 Timing Characteristics ..........................................................................................................................................8 2-WIRE Timing Waveforms ...................................................................................................................................8 Pin Configuration ...................................................................................................................................................9 Marking Information...............................................................................................................................................9 Pin Description.......................................................................................................................................................9 Circuit Description ...............................................................................................................................................10 General Description .............................................................................................................................................. 10 Block Diagram....................................................................................................................................................... 10 VREF..................................................................................................................................................................... 10 GPIO ..................................................................................................................................................................... 11 Charge Pump ........................................................................................................................................................ 12 RC Oscillator ......................................................................................................................................................... 13 2-WIRE.................................................................................................................................................................. 14 2-WIRE Communication Format ........................................................................................................................... 14 2-WIRE Address.................................................................................................................................................... 14 ZoomingADC ........................................................................................................................................................15 Features ................................................................................................................................................................ 15 Overview ............................................................................................................................................................... 15 ZADC Description.................................................................................................................................................. 15 Acquisition Chain................................................................................................................................................... 15 Registers ............................................................................................................................................................... 17 ZADC Detailed Functionality Description.............................................................................................................. 18 Continuous-Time vs. On-Request......................................................................................................................... 18 Input Multiplexers .................................................................................................................................................. 19 Programmable Gain Amplifiers ............................................................................................................................. 20 PGA & ADC Enabling............................................................................................................................................ 21 PGA1..................................................................................................................................................................... 21 PGA2..................................................................................................................................................................... 21 PGA3..................................................................................................................................................................... 21 ADC Characteristics.............................................................................................................................................. 22 Conversion Sequence........................................................................................................................................... 22 Over-Sampling Frequency .................................................................................................................................... 22 Over-Sampling Ratio............................................................................................................................................. 23 Elementary Conversions ....................................................................................................................................... 23 Resolution ............................................................................................................................................................. 24 Conversion Time and Throughput......................................................................................................................... 25 Output Code Format ............................................................................................................................................. 26 Power Saving Modes ............................................................................................................................................ 27 Registers Map ....................................................................................................................................................... 28 Registers Descriptions .......................................................................................................................................... 28 RC Register........................................................................................................................................................... 28 GPIO Registers ..................................................................................................................................................... 29 ZADC Registers .................................................................................................................................................... 30 Mode Register....................................................................................................................................................... 31 Optional Operating Modes: External Voltage Reference Option .......................................................................... 32 Application Hints..................................................................................................................................................33 Recommended Operation Mode and Registers Settings...................................................................................... 33 Operation Mode..................................................................................................................................................... 33 V1.8 2009 Semtech Corp. www.semtech.com 2