PAC7640 Datasheet - Pixart Imaging Inc.

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
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Frame Rate (fps)
Heart Rate Measurement
30 - 210
Range (bpm)
Package Size (mm)
3.0 x 4.7 x 1.0
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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
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Applications
Value
-20 to +60
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Parameter
Operating Junction
Temperature (°C)
Interfaces
Input Clock (MHz)
Supply Voltage (V)
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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
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CSN_ID1
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Green LED
VOLTAGE REGULATOR
AND POWER CONTROL
1.1
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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
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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.
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PAH8001EI-2G
Optical Heart Rate Detection Sensor
PixArt Imaging Inc.
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2.0 Signal Description
Table 1. PAH8001 Signal Pins Description
4
VDD18V
SDIO
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9
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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
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Pin No. Signal Name
Functional Group:
1
LED_P
2
VDD28V
3
VSS
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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
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Pin No.
Figure 4. Package Outline Diagram
Pi
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C
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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.
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PAH8001EI-2G
Optical Heart Rate Detection Sensor
PixArt Imaging Inc.
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4.0 Reference Schematics
Figure 5. Application Circuit of PAH8001
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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.
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2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
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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.
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