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PixArt Imaging Inc.

PAH8011ES Product Datasheet

Low Power Heart Rate Monitor Optical Chip

Version 1.1 | 20 Oct 2017 | 31008AEN

PixArt Imaging Inc. http://www.pixart.com

All rights reserved. Any portion in this paper shall not be reproduced, copied, or transformed to any other forms without permission.

Introduction

1.1

Overview

The PAH8011ES is a discrete optical-based Heart Rate Detection (HRD) chip that optimizes for low power and high-

performance operation. It has three LEDs driver to support with 2 Green LEDs and 1 Infrared LED externally. It comes with

at the host.

The Figure 1 shows the architecture block diagram of the device. Refer to the subsequent chapters for detailed information

on the functionality of the different interface blocks.

Note: Throughout this document PAH8011ES Low Power Optical Heart Rate Monitor Chip is referred to as the PAH8011ES.

Array

Timing Generator

PGA + ADC

LED Driver

Signal Process

SRAM

FIFO Buffer

LED Channel

Clock Generator

Lo speed

RC 32Khz

Hi speed

RC 4Mhz

Power Regulator

Output

VDDAY: 2.8V

Input

VDDM: 3.1 - 3.6V

VDDA/VDDD: 1.7 - 1.9V

VDDIO: 1.62 - 3.6V

INT1

I

CH_A

PAH8011ES

LED1

LED2

POWERDN

LED0

VDDAY

VDDA/VDDD

VDDIO

I2C_SCL

I/O Interfaces

I2C_SDA

VDDM

INT2

VSSA

VSSD

VSSLED

P

O

W

E

R

G

N

D

SERIAL INTERFACE

LED

Driver

INT1

POWERDN

INT2

CH_B

CH_C

CH_T

Figure 1. Functional Block Diagram

1.2

Terminology

Term

Description

GND

Ground

BiDir

Bi-Directional

PPG

Photoplethysmogram

Touch

Touch detection for wear on or wear off