ADPD144RI

Data Sheet

Rev. A | Page 2 of 34

TABLE OF CONTENTS

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

 

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

 

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

 

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

 

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

 

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

 

I2C Digital Input/Output Specifications.................................... 4

 

I2C Timing Specifications............................................................ 5

 

Absolute Maximum Ratings............................................................ 6

 

Thermal Resistance ...................................................................... 6

 

Recommended Soldering Profile ............................................... 6

 

ESD Caution.................................................................................. 6

 

Pin Configuration and Function Descriptions............................. 7

 

Typical Performance Characteristics ............................................. 8

 

Theory of Operation ........................................................................ 9

 

Introduction .................................................................................. 9

 

Optical Components.................................................................... 9

 

Sampling Operation ................................................................... 10

 

Pulse Timing ............................................................................... 10

 

Time Slot Switch ......................................................................... 11

 

State Machine Operation........................................................... 12

 

Sample Mode Operation and Data Flow................................. 12

 

Adjustable Sampling Frequency ............................................... 13

 

LED Driver Operation............................................................... 13

 

I2C Serial Interface.......................................................................... 15

 

Applications Information .............................................................. 16

 

Typical Connection Diagram ................................................... 16

 

Land Pattern................................................................................ 16

 

Recommended Start-Up Sequence .......................................... 16

 

Reading Data............................................................................... 17

 

Clocks and Timing Calibration ................................................ 18

 

Determining CVLED ..................................................................... 19

 

Determining the Average LED Current .................................. 20

 

Calculating the Total Power Consumption ............................ 20

 

Optimizing SNR per Watt ......................................................... 21

 

Mechanical Considerations for Covering the ADPD144RI . 22

 

Sample Setup File SpO2............................................................. 22

 

Register Listing ............................................................................... 23

 

LED Control Registers............................................................... 26

 

AFE Configuration Registers.................................................... 28

 

System Registers ......................................................................... 29

 

ADC Registers ............................................................................ 32

 

Data Registers ............................................................................. 33

 

Outline Dimensions ....................................................................... 34

 

Ordering Guide .......................................................................... 34

 

REVISION HISTORY

2/2019—Revision A: Initial Version