AD5940 datasheet(3/130 Pages) AD

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Data Sheet

AD5940

Rev. 0 | Page 3 of 130

Using the Waveform Generator with the Low Power DAC ..92

Waveform Generator Registers .................................................93

SPI Interface.....................................................................................96

Overview ......................................................................................96

SPI Pins.........................................................................................96

SPI Operation ..............................................................................96

Command Byte............................................................................96

Writing to and Reading from Registers ...................................96

Reading Data from the Data FIFO ...........................................97

Sleep and Wake-Up Timer .............................................................98

Sleep and Wake-Up Timer Features .........................................98

Sleep and Wake-Up Timer Overview.......................................98

Configuring a Defined Sequence Order ..................................98

Recommended Sleep and Wake-Up Timer Operation ..........98

Sleep and Wake-Up Timer Registers........................................99

Interrupts....................................................................................... 103

Interrupt Controller Interupts................................................ 103

Configuring the Interrupts ..................................................... 103

Custom Interrupts.................................................................... 103

External Interrupt Configuration .......................................... 103

Interrupt Registers ................................................................... 104

External Interrupt Configuration Registers ......................... 109

Digital Inputs/Outputs ................................................................ 113

Digital Inputs/Outputs Features............................................. 113

Digital Inputs/Outputs Operation..........................................113

GPIO Registers..........................................................................114

System Resets.................................................................................117

Analog Die Reset Registers......................................................117

Power Modes .................................................................................118

Active High Power Mode (>80 kHz)......................................118

Active Low Power Mode (<80 kHz) .......................................118

Hibernate Mode ........................................................................118

Shutdown Mode........................................................................118

Low Power Mode ......................................................................118

Power Modes Registers ............................................................118

Clocking Architecture ..................................................................121

Clock Features ...........................................................................121

Clock Architecture Registers...................................................121

Applications Information.............................................................125

EDA Bioimpedance Measurement Using a Low Bandwidth

Loop............................................................................................125

Body Impedance Analysis (BIA) Measurement Using a High

Bandwidth Loop........................................................................126

High Precision Potentiosat Configuration ............................127

Using the AD5940, AD8232, and AD8233 for Bioimpedance

and Electrocardiogram (ECG) Measurements .....................128

Smart Water/Liquid Quality AFE...........................................129

Outline Dimensions......................................................................130

Ordering Guide .........................................................................130

REVISION HISTORY

3/2019—Revision 0: Initial Version

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