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Version 1.1 | 13 Sep 2015 | 30000EN 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. PAH8001EI-2G Product Brief Optical Heart Rate Detection Sensor PixArt Imaging Inc. PAH8001EI-2G: Optical Heart Rate Detection Sensor General Description The PAH8001EI-2G is a high performance and low power CMOS-processed optical sensor with Green LED and integrated Digital Signal Processor serving as a Heart Rate Detection sensor. It is based on optical technology which measures the variation of human blood movement in the vessel and using this measured data to estimate heart beat rate. Key Features  Heart rate detection function  Ultra-low power consumption with power saving modes during no touch movement period  LPT sleep1  LPT sleep2  Flexible sleep rate control  Flexible communication interface  I2C  4-wire SPI  2-wire SPI  I2C interface up to 1 Mbit/s  SPI interface up to 1 Mbit/s  Hardware reset support  Hardware power down support  Integrated chip- on-board LED with wavelength of 525nm

Applications

 Healthcare/Sports wearable device  Photoplethysmogram waveform  Smart wearable eg. watch, wrist-band Key Parameters Parameter Value Operating Junction Temperature (°C) -20 to +60 Interfaces I2C, 2-Wire SPI, 4-Wire SPI Input Clock (MHz) 6.8Mhz Supply Voltage (V) VDDM: 3.3 – 3.6 VDDIO: 1.62 – 3.6 Average Supply Current (mA) Note: including LED current without I/O toggling Run: 1.5 Sleep1: 0.16 Sleep2: 0.04 Power down: 0.015 Frame Rate (fps) Up to 3000 Heart Rate Measurement Range (bpm) 30 - 210 Package Size (mm) 3.0 x 4.7 x 1.0

Ordering Information

PAH8001EI-2G 16-pin LGA Package For any additional inquiries, please contact us at http://www.pixart.com/contact.asp PixArt Confidential

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1.0 System Overview

application as it is noninvasive yet accurate and simple to use.

1.1 Block Diagram

Figure 1. PAH8001 Functional Block Diagram Figure 2. System Block Diagram

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2.0 Signal Description

Figure 3. Pin Configuration Table 1. PAH8001 Signal Pins Description

3 VSS Ground Chip Ground

9 SDIO BiDir

11 CSN_ID1 Input 4-Wire SPI: Chip Select (Active Low)

13 SDI_ID0 Input 4-Wire SPI: Data Input pin

15 SCK Input 2-Wire SPI/ 4-Wire SPI/ I2C: Serial Clock pin

5 SCI Output Touch On/Off INT (Active High)

6 RESET_N Input

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7 PD Input

14 MDSEL Input

3.0 Mechanical Dimensions

Figure 4. Package Outline Diagram

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4.0 Reference Schematics

Figure 5. Application Circuit of PAH8001

  1. Connect R1 and R2 for I2C Only.
  2. VDD28V and VDD18V must have 0.1µF bypass capacitor connected to GND.
  3. SCI can connect to MCU HW INT as Touch INT for power saving (Active high).
  4. VDDM and VDDIO power noise must be under 100mV.
  5. Tie MDSEL to VDDIO for 2-Wire SPI, floating for 4-Wire SPI, and GND for I2C.
  6. ID0 and ID1 can be directly tied to VDDIO or GND based on your I2C ID selection.
  7. LED pin must pull high with100K resistor to VDDM for internal circuit voltage reference
  8. At power on, VDDM and VDDIO must be powered on at the same time or VDDIO to be powered on first before VDDM.
  9. At power off, VDDM and VDDIO must be powered off at the same time or VDDIO to be powered off first before