PAH8001EI-2G Product Brief PixArt Imaging Inc. Optical Heart Rate Detection Sensor PAH8001EI-2G: Optical Heart Rate Detection Sensor General Description Key Parameters Key Features Average Supply Current (mA) 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 2 I C 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 Note: including LED current without I/O toggling en fid Frame Rate (fps) Heart Rate Measurement 30 - 210 Range (bpm) Package Size (mm) 3.0 x 4.7 x 1.0 C on rt I2C, 2-Wire SPI, 4-Wire SPI 6.8Mhz VDDM: 3.3 – 3.6 VDDIO: 1.62 – 3.6 Run: 1.5 Sleep1: 0.16 Sleep2: 0.04 Power down: 0.015 Up to 3000 Ordering Information Part Number PAH8001EI-2G Package Type 16-pin LGA Package For any additional inquiries, please contact us at http://www.pixart.com/contact.asp xA Applications Value -20 to +60 l Parameter Operating Junction Temperature (°C) Interfaces Input Clock (MHz) Supply Voltage (V) tia 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. Pi Healthcare/Sports wearable device Photoplethysmogram waveform Smart wearable eg. watch, wrist-band 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. 1 PAH8001EI-2G Optical Heart Rate Detection Sensor PixArt Imaging Inc. 1.0 System Overview Block Diagram SCI LED Driver TOUCH/ WAKE UP POWER ON RESET CMOS IMAGE SENSOR 2-wire SPI Interface I2C Interface SCK SDIO SDI_ID0 SCK SDIO SERIAL INTERFACE SCK VDD28V VSS DIGITAL SIGNAL PROCESSOR & ALGORITHM VDDM C on 4-wire SPI Interface VDDIO VDD18V fid CSN_ID1 en Green LED VOLTAGE REGULATOR AND POWER CONTROL 1.1 tia l The heart rate detection of PAH8001 is based on optical measurement technique that uses a light source and a detector to detect cardio-vascular pulse wave that propagates through body. The detected signal (pulse wave) is called photoplethysmography and its acronym in some literatures is PPG or PTG. The PPG signal reflects the blood movement in the vessel, which goes from the heart to the fingertips through the blood vessels in a wave-like motion. Therefore, we can use this PPG signal to estimate heart rate. This optical based technology could offer significant benefits to healthcare application as it is noninvasive yet accurate and simple to use. CONTROL REGISTER SDIO OSCILLATOR Pi xA rt Figure 1. PAH8001 Functional Block Diagram Figure 2. System Block Diagram 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. 2 PAH8001EI-2G Optical Heart Rate Detection Sensor PixArt Imaging Inc. en tia l 2.0 Signal Description Table 1. PAH8001 Signal Pins Description 4 VDD18V SDIO xA 9 rt 10 VDDM 12 VDDIO 16 LED_N Functional Group: Description Type Power Supplies Power LED Anode. Provide VDDM supply voltage Output Analog circuit power regulator output. Must connect a 0.1µF capacitor to GND Ground Chip Ground Analog and digital circuit power regulator output. Must connect a 0.1µF capacitor Output to GND Power Power supply for internal power regulator. VDDM: 3.3 – 3.6 V Power I/O power supply. VDDIO: 1.62 – 3.6 V LED LED Cathode. Must connect to LED Control Interface 4-Wire SPI: Data Output pin BiDir 2-Wire SPI: Data In-Out pin I2C: Data In-Out pin 4-Wire SPI: Chip Select (Active Low) Input I2C: Address Set ID1 (Tri state IO) 4-Wire SPI: Data Input pin Input I2C: Address Set ID0 (Tri-State IO) Input 2-Wire SPI/ 4-Wire SPI/ I2C: Serial Clock pin Functional I/O Output Touch On/Off INT (Active High) Hardware control to enter Reset mode Level High: Exit Reset mode Input Level Low: Enter Reset mode Set to high when not using C on Pin No. Signal Name Functional Group: 1 LED_P 2 VDD28V 3 VSS fid Figure 3. Pin Configuration CSN_ID1 13 SDI_ID0 Pi 11 15 SCK Functional Group: 5 SCI 6 RESET_N 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. 3 PAH8001EI-2G Optical Heart Rate Detection Sensor PixArt Imaging Inc. Signal Name Type 7 PD Input 8 LED Output 14 MDSEL Input Description Hardware control to enter Power Down mode with internal 1MΩ pull-down resistor Level High: enter power down mode Level Low: leave power down mode Set to low when not using LED driver connection. Must connect to LED_N Tri state IO. For mode selection of 2-Wire SPI, 4-Wire SPI or I2C I2C: Pull down. Tie to GND 4-Wire SPI: Floating 2-Wire SPI: Pull high. Tie to VDDIO en tia l Pin No. Figure 4. Package Outline Diagram Pi xA rt C on fid 3.0 Mechanical Dimensions 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. 4 PAH8001EI-2G Optical Heart Rate Detection Sensor PixArt Imaging Inc. fid en tia l 4.0 Reference Schematics Figure 5. Application Circuit of PAH8001 xA rt VDDM & VDDIO = 3.3V~3.6V (for 3.3V System). VDDM = 3.3V~3.6V, VDDIO: 1.62V~1.98V (for 1.8V System). Connect R1 and R2 for I2C Only. VDD28V and VDD18V must have 0.1µF bypass capacitor connected to GND. SCI can connect to MCU HW INT as Touch INT for power saving (Active high). VDDM and VDDIO power noise must be under 100mV. Tie MDSEL to VDDIO for 2-Wire SPI, floating for 4-Wire SPI, and GND for I2C. ID0 and ID1 can be directly tied to VDDIO or GND based on your I2C ID selection. LED pin must pull high with100K resistor to VDDM for internal circuit voltage reference At power on, VDDM and VDDIO must be powered on at the same time or VDDIO to be powered on first before VDDM. At power off, VDDM and VDDIO must be powered off at the same time or VDDIO to be powered off first before VDDM. Pi 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. C on Design Notes 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. 5