ADPD188GG datasheet(2/61 Pages) AD

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ADPD188GG

Data Sheet

Rev. B | Page 2 of 61

TABLE OF CONTENTS

Features.............................................................................................. 1

Applications ...................................................................................... 1

General Description......................................................................... 1

Functional Block Diagram .............................................................. 1

Revision History ............................................................................... 2

Specifications .................................................................................... 3

Analog Specifications................................................................... 5

Digital Specifications ................................................................... 6

Timing Specifications .................................................................. 7

Absolute Maximum Ratings ........................................................... 9

Thermal Resistance ...................................................................... 9

Recommended Soldering Profile ............................................... 9

ESD Caution.................................................................................. 9

Pin Configuration and Function Descriptions .......................... 10

Typical Performance Characteristics........................................... 11

Theory of Operation ...................................................................... 13

Introduction................................................................................ 13

Optical Components.................................................................. 13

Dual Time Slot Operation......................................................... 14

Time Slot Switch......................................................................... 15

Adjustable Sampling Frequency............................................... 16

External Synchronization for Sampling.................................. 16

State Machine Operation .......................................................... 16

Normal Mode Operation and Data Flow................................ 17

Communications Interface ........................................................... 19

I2C Interface ................................................................................ 19

SPI Port........................................................................................ 20

Applications Information.............................................................. 22

Typical Connection Diagram................................................... 22

Land Pattern ............................................................................... 22

Recommended Start-Up Sequence.......................................... 23

Reading Data............................................................................... 23

Clocks and Timing Calibration................................................ 24

Optional Timing Signals Available on GPIO0 and GPIO1 . 25

LED Driver Pins and LED Supply Voltage............................. 26

LED Driver Operation............................................................... 26

Determining the Average Current........................................... 27

Determining CVLED ..................................................................... 27

Using External LEDs ................................................................. 28

Calculating Current Consumption.......................................... 28

Mechanical Considerations for Covering the ADPD188GG ... 31

TIA ADC Mode.......................................................................... 31

Pulse Connect Mode.................................................................. 33

Synchronous ECG and PPG Measurement Using TIA ADC

Mode ............................................................................................ 34

Float Mode .................................................................................. 35

LED Control Registers............................................................... 46

AFE Configuration Registers.................................................... 48

Float Mode Registers ................................................................. 52

System Registers......................................................................... 55

ADC Registers ............................................................................ 59

Data Registers ............................................................................. 60

Outline Dimensions....................................................................... 61

Ordering Guide .......................................................................... 61

REVISION HISTORY

4/2020—Rev. A to Rev. B

Change to Applications Section ..................................................... 1

Changes to Table 4 and Figure 2.................................................... 7

Change to Reset Column, Table 26.............................................. 42

Added Endnote 1, Table 27........................................................... 46

Changes to Table 32....................................................................... 55

10/2018—Rev. 0 to Rev. A

Changes to Figure 24 and Figure 25............................................ 22

Changes to Calibrating the 32 kHz Clock Section..................... 25

Added Improving SNR Using Integrator Chopping Section and

Figure 32; Renumbered Sequentially........................................... 29

Added Table 18; Renumbered Sequentially ............................... 30

Changes to Table 26....................................................................... 42

Changes to Table 29....................................................................... 50

Changes to Table 30....................................................................... 51

Changes to Address 0x58 Description Column, Table 31........ 53

2/2018—Revision 0: Initial Version

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