SX8724CWLTDT Semtech

SX8724C ZoomingADC for sensing data acquisition ADVANCED COMMUNICATIONS & SENSING DATASHEET DESCRIPTION FEATURES The SX8724C is a data acquisition system based on Up to 16-bit differential data acquisition Programmable gain: (1/12 to 1000) Semtech s low power ZoomingADC technology. It Sensor offset compensation up to 15 times full scale directly connects most types of miniature sensors of input signal with a general purpose microcontroller. 3 differential or 6 single-ended signal inputs Programmable Resolution versus Speed versus With 3 differential inputs, it can adapt to multiple Supply current sensor systems. Its digital outputs are used to bias or Digital outputs to bias Sensors reset the sensing elements. Internal or external voltage reference Internal time base Low-power (250 uA for 16b 250 S/s) Fast I2C interface with external address option, no clock stretching required APPLICATIONS ORDERING INFORMATION Industrial pressure sensing DEVICE PACKAGE REEL QUANTITY Industrial temperature sensing SX8724CWLTDT MLPQ-W-16 4x4 1000 Industrial chemical sensing Barometer - Available in tape and reel only - WEEE/RoHS compliant, Pb-Free and Halogen Free. Compass FUNCTIONAL BLOC DIAGRAM SX8724C VBATT TM ZoomingADC + - + + V REF - - AC0 AC1 AC2 AC3 PGA ADC READY AC4 AC5 MCU AC6 AC7 CONTROL LOGIC D0 D1 SCL CHARGE 4MHz 2 GPIO I C PUMP OSC D2 SDA D3 VPUMP VSS Revision 1.01 January 2011 Page 1 www.semtech.com/products/ Semtech Not Recommended for New Designs REF MUX SIGNAL MUXSX8724C ZoomingADC for sensing data acquisition ADVANCED COMMUNICATIONS & SENSING DATASHEET TABLE OF CONTENT Section Page ELECTRICAL SPECIFICATIONS 4 1 Absolute Maximum Ratings 4 2 Operating Conditions . 5 2.1 Timing Characteristics . 9 2.1.1 POR Waveforms . 9 2.1.2 I2C interface timings . 10 2.1.3 I2C timing Waveforms 11 CIRCUIT DESCRIPTION . 12 3 Pin Configuration . 12 4 Marking Information . 12 5 Pin Description . 13 6 General Description . 14 6.1 Bloc diagram . 14 6.2 VREF . 14 6.3 GPIO . 14 6.3.1 Optional Operating Mode: External Vref 16 6.4 Charge Pump 17 6.5 RC Oscillator . 17 6.5.1 Wake-up from sleep 17 7 ZoomingADC 18 7.1 Overview 18 7.1.1 Acquisition Chain 18 7.1.2 Programmable Gain Amplifiers . 19 7.1.3 PGA & ADC Enabling 20 7.2 ZoomingADC Registers 20 7.3 Input Multiplexers (AMUX and VMUX) . 21 7.4 First Stage Programmable Gain Amplifier (PGA1) 22 7.5 Second Stage Programmable Gain Amplifier (PGA2) . 23 7.6 Third Stage Programmable Gain Amplifier (PGA3) . 23 7.6.1 PGA Ranges . 25 7.7 Analog-to-Digital Converter (ADC) 28 7.7.1 Conversion Sequence 28 7.7.2 Over-Sampling Frequency (fs) 29 7.7.3 Over-Sampling Ratio (OSR) . 29 7.7.4 Number of Elementary Conversions (Nelconv) . 29 7.7.5 Resolution . 30 7.7.6 Conversion Time & Throughput . 31 7.7.7 Continuous-Time vs. On-Request Conversion . 32 7.7.8 Output Code Format . 33 7.7.9 Power Saving Modes . 35 8 Application hints 36 8.1 Power Reduction 36 8.2 Gain Configuration Flow 37 9 I2C Interface . 38 9.1 General Features . 38 9.2 Other Slave Address Options 38 Revision 1.01 January 2011 Page 2 www.semtech.com/products/ Semtech Not Recommended for New Designs