sx8722 Semtech Corporation, sx8722 Datasheet
sx8722
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sx8722 Summary of contents
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... NC SLEEP SHUT READY 5 NC SX8722 NC NC BIAS EE_POW 10 EE_SDA EE_SCL VSS AR1N AR1P 30 AC0 AC1 AC2 AC3 AC4 25 AC5 AC6 AC7 ...
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ZoomingADC™ ...
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ZoomingADC™ ...
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Inputs REF IN,ADC Measurement ADC engine ...
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... Hex Register Description 0x00 SXCtrl1 Control register of the SX8722 0x01 SXCtrl2 Control register of the SX8722 0x02 SXCfgEn Configuration enable register, enables configurations from 0x03 SXUpdated Updated value on configuration registers Hex Register Description 0x0A C1ZAdcReg1 ZoomingADC™ Register 01 0x0B C1ZAdcReg2 ZoomingADC™ Register 02 ...
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... Reads 8bit data from a given address Sets the SX8722 to sleep mode Sets the SX8722 to shutdown mode Resets the SX8722 Saves the SX8722 registers in the external EEPROM (if present) Loads the SX8722 registers with the content of the external EEPROM (if present) Byte 0x10 0x20 0x30 ...
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Write data direct Write data masked ...
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Read data Other commands Unknown commands ...
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Reading data after a measurement. ...
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Introduction Features covered by predefined settings 1 2 Inputs IN,ADC ADC REF 5 Measurement ...
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Input multiplexers Overview Inputs Input channel selection. Differential mode Single-ended mode Invert input polarity IN,ADC ADC ...
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Input multiplexers cont’d Reference channel selection Application example ...
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Programmable gain amplifier settings Overview Inputs REF Configuration flow f S IN,ADC ADC 2 3 Measurement engine 2 3 ...
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Programmable gain amplifiers settings cont’d Enable/disable PGAs PGA 3 Gain configuration PGA 2 Gain configuration PGA 1 Gain configuration ...
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Programmable gain amplifier settings cont’d Application example ...
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Offset cancellation Overview Inputs IN,ADC ADC REF Measurement engine ...
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Offset cancellation (Cont.) Application examples Case 1 Case 2 ...
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ADC parameters Overview Inputs ADC settings IN,ADC ADC REF Measurement engine ...
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Measurement engine Overview Inputs Measurement engine settings IN,ADC ADC REF Measurement engine ...
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... Hardware considerations SX8722 ZoomingADC™ default settings ...
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Overview ...
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Measurement engine Overview Functional flowchart RESET / Power on reset Load Read Enabled Configurations [SXCtrlEn] CONT bit ? Idle mode Conf 1 ? Conf 2 ? Conf 3 ? Conf 4 ? Store intermediate values Measure conf 1 Measure conf ...
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Measurement engine (Cont.) SXCfgEn – Configuration enabling register Bits 7 SXCfgEn reserved reserved SXUpdated – Updated configuration register Bits 7 SXUpdated OVF4 OVF3 Configuration register – measurement mode Bits 7 C1SXCfg Reserved FILTER TYPE [2: reserved reserved ...
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Measurement engine (Cont.) Filtering Filter types Configuration register – filtering Bits 7 C1SXCfg Reserved FILTER TYPE [2:0] Filter type [6:4] Code mode 000 none 001 Average filtering 010 moving average filtering 011 reserved ALRM1 ...
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Measurement engine (Cont.) Filtering (Cont.) Filter parameter register Bits 7 C1FParam Filter size [7: ...
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... Measurement engine (Cont.) Alarms Configuration register – alarms Bits 7 C1SXCfg Reserved FILTER TYPE [2:0] Alarm threshold registers Bits 7 C1Alrm1OnMsb C1Alrm1OnLsb C1Alrm1OffMsb C1Alrm1OffLsb C1Alrm2OnMsb C1Alrm2OnLsb C1Alrm2OffMsb C1Alrm2OffLsb SXCtrl2 – SX8722 Control register 2 Bits 7 6 SXCtrl2 reserved reserved ALRM1 S1ALRM1ON [15:8] S1ALRM1ON [7:0] S1ALRM1OFF [15:8] S1ALRM1OFF [7:0] ...
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Measurement engine (Cont.) Alarms(cont.) ...
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I2C EEPROM Overview Schematic ...
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... Using the SX8722 Stand alone Schematic ...
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Frequency calibration process Overview Using an 32.768 kHz XTAL Using a 32.768 kHz External clock source Schematics ...
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Working below 3 Volts Operating range Internal voltage multiplier Schematic ...
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... EE_D XTAL_D CKOUT RESERVED SLEEP SHUT CAL r 0 SXCtrl2 – SX8722 Control register 2 Bits 7 6 SXCtrl2 reserved reserved Pos SXCtrl1 rw reset 3 AL1OnC AL1OffC AL2OnC AL2OffC CKOUT RESERVED EE ...
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ZoomingADC™ ZoomingADC Features Overview Analog IN 3 Inputs Input Selection 0 V Reference 1 Inputs 2 3 Gain1 Gain2 Reference Selection PGA1 PGA2 PGA3 V V ...
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Register map ...
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Register map (Cont.) ...
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ZoomingADC Description Acquisition Chain V REF V IN,ADC OUT IN , ADC ADC REF IN,ADC V IN,ADC GDoff IN , ADC ...
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ZoomingADC™ Detailed block diagram Inputs CxAdcReg6 CxAdcReg5 CxAdcReg4 CxAdcReg3 CxAdcReg2 CxAdcReg1 f S PGA1 PGA2 PGA3 GD1 GD2 GD3 OFF2 OFF3 V REF ...
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ZoomingADC™ registers CxZAdcReg1 to 6 CxDataOutLSB CxDataOutMSB CxZadcReg1 R IB_AMP_ADC[1: CxZadcReg2 0] CxZadcReg3 FIN[1:0] PGA1_ CxZadcReg4 G CxZadcReg5 CxZadcReg6 R CxDataOutMSB & LSB OUT[7:0] OUT[15:8] SET_NELC[1:0] SET_OSR[2:0] IB_AMP_PGA[1:0] PGA2_GAIN[1:0] PGA3_GAIN[6:0] PGA3_OFFSET[6:0] R AMUX[4:0] ENABLE[3:0] PGA2_OFFSET[3:0] VMUX ...
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ZoomingADC™ registers (Cont.) OUT OUT[15] SET_NELC SET_OSR CONT IB_AMP_ADC IB_AMP_PGA ENABLE FIN PGA1_GAIN PGA2_GAIN PGA3_GAIN PGA2_OFFSET PGA3_OFFSET AMUX(4:0): AMUX[4] A(0) VMUX R(3) OSR OSR f RC PGA3_GAIN[6:0] AMUX(3) AMUX[2:0] R(2) IB_AMP_ADC[1:0] IB_AMP_PGA[1: PGA2_OFFSET[5:0] PGA3_OFFSET[5:0] R(1) R(0) ...
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Input Multiplexers AC_R(0) AC_R(3) V REF INP INN REF REFP REFN V IN1 AMUX[4:0] V INP (RegACCfg5[5:1]) V REF2 (RegACCfg5[0]) AC_A(0) AC_A(7) V IN4 AMUX[4:0] V INN (RegACCfg5[5:1 REFP REFN ...
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Programmable Gain Amplifiers ENABLE[3:0] PGA1_GAIN PGA2_GAIN[1: ...
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Programmable Gain Amplifiers (Cont.) PGA2_OFFSET[3:0] PGA3_GAIN[6:0] GDoff ...
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Programmable Gain Amplifiers (Cont.) PGA3_OFFSET[6:0] PGA & ADC Enabling PGA1 PGA2 GDoff GDoff 2 2 GDoff 3 ...
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PGA3 GDoff IN , ADC GDoff IN,ADC GDoff IN , ADC TOT TOT ...
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Conversion Sequence N ELCONV T ( OSR ELCONV S N ELCONV T ELCONV Elementary Init Conversion Conversion index 1 Offset + Sampling Frequency OSR = (OSR+1)/f S Elementary Elementary Elementary Conversion Conversion Conversion ...
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Over-Sampling Ratio OSR 3 SET_OSR OSR 2 (RegACCfg0[4:2]) Elementary Conversions SET_NELC ELCONV (RegACCfg0[6:5]) N ELCONV SET_OSR[2:0] OSR SET_NELC[1:0] N ELCONV N ELCONV ...
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Resolution n 2 log ( OSR ) log ( ELCONV SET_NELC 000 001 010 011 100 101 110 SET_OSR 111 n ...
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Conversion Time & Throughput OSR ) 1 CONV ELCONV f SET_NELC RC SET_OSR [2:0] 16.0 14.0 12.0 10.0 8.0 6.0 4.0 10 CONV FIN SET_NELC[1: ...
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Output Code Format V OSR IN , ADC 16 OUT 2 ADC V OSR REF V OUT 2 GD ADC TOT V REF TOT GDoff GDoff GD ...
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Output Code Format (Cont.) SET_OSR SET_NELC = 00 [2: OSR REF LSB n GD OSR 1 2 TOT ADC REFP REFN 2 SET_NELC = 01 SET_NELC = 10 n RegACOutMSB[7:0] RegACOutLSB[7:0] ...
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Power Saving Modes IB_AMP_ADC[1:0] IB_AMP_ADC [1:0] Specifications and Measured Curves Default Settings T V BATT f GDOff 2 IB_AMP_PGA [1: REF IN RC GDOff 3 IB_AMP_ADC[1:0] n OSR n OSR IB_AMP_PGA[1: IB_AMP_PGA[1:0] N ELCONV N ...
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Specifications f RC GDOff 3 OSR N ELCONV BATT f S IB_AMP_ADC[1:0] IB_AMP_PGA[1:0] n OSR V V REF IN GD GDOff TOT ELCONV OSR OSR OSR ...
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Specifications (Cont’ ELCONV OSR TOT GDoff GDoff OSR N OSR ELCONV ...
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Specifications (Cont’d) N ELCONV N ELCONV IB_AMP_ADC[1:0] IB_AMP_ADC[1:0] IB_AMP_ADC[1:0] IB_AMP_ADC[1: OSR f CONV ELCONV S RegACCfg1-5 OSR OSR Start IB_AMP_PGA[1:0] IB_AMP_PGA[1:0] IB_AMP_PGA[1:0] IB_AMP_PGA[1:0] ...
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ZoomingADC ™ Performances Integral non linearity INL: No gain - 40°C PGA1 off; PGA2 off; PGA3 off; set_osr = 7, set_nelconv = 3, Vbat=5V, Vref=5V, Vcommon= -10 0 500 1000 ...
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Integral non linearity (Cont.) INL: Gain = 100 - 40°C PGA1 = 10; PGA2 = 10; PGA3 off; set_osr = 7; set_nelconv = 3; VBAT = 5V; Vref = 5V; Vcommon = ...
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Differential non linearity Resolution vs Acquisition time resolution vs acquisition time 100 1000 time [us] 10000 100000 ...
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Outline drawings MLPQ 7x7mm 44 pins A D PIN 1 INDICATOR (LASER MARK) A aaa D/2 NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. COPLANARITY APPLIES TO THE EXPOSED ...
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Land Pattern MLPQ 7x7mm 44 pins ( NOTES: 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. 2. THERMAL VIAS IN ...