Si1144-AAGX Data Short

Si1144-AAGX Data Short
Optical Heart Rate Sensor Module with I2C Interface and HR Measurement Software
The Si1144-AAGX is a low-power, reflectance-based, heart rate
sensor. This optical heart rate sensor module includes an analogto-digital converter, integrated high-sensitivity photodiodes, host
communications processor, a green high efficiency LED, and
three integrated LED drivers with ninety selectable drive levels.
The Si1144-AAGX offers excellent performance under a wide dynamic range and a variety of light sources from 525 nm to 940
nm. The Si1144-AAGX devices are provided in a 10-lead 4.9 x
2.85 x 1.2 mm LGA module package and are capable of operation from 1.71 to 3.6 V over the –40 to +85 °C temperature range.
KEY FEATURES
• Fully integrated heart rate sensor with ARM code library for
extracting HR from the optical sensor data
• Green LED with lens
• High-sensitivity photodiode
• Low-noise analog-to-digital converter and filtering
• LED drivers
• Optical blocking
• Host communications and interrupts
• Optional Movement compensation uses external accelerometer data
• Accurate sensing of weak blood flow signals on the wrist
• Three independent regulated LED drivers
• Scalable from cost-sensitive single LED systems to high
performance three LED systems
Applications:
• Fitness Bands
• Smart Watches
• Other Wearables
• Healthcare
• Programmable from 6 mA to 360 mA each
• Integrated green LED ideal for wrist based heart rate applications
• Add up to 2 external LEDs
• Broad spectral sensitivity supports green through 940 nm LEDs
• No additional optical blocking required
• Low power consumption
• 1.71 to 3.6 V supply voltage
Sensor Die
VDD
Regulator
Temp
Visible
Infrared
LED1
A
M
U
X
ADC
Filter
LED
Drivers
LED3
LED2
LED1
• 25.6 μs LED “on” time keeps total power consumption duty cycle
low without compromising performance or noise immunity
LED3
• < 500 nA standby current
LEDA
LED2
• Built-in voltage supply monitor and power-on reset controller
• I2C serial communications
• Up to 3.4 Mbps data rate
Digital Sequencer & Control Logic
INT
SCL
SDA
I2C
Registers
• Internal and external wake support
Oscillator
GND
• Slave mode hardware address decoding (0x5A)
• 10-lead 4.9 X 2.85 x 1.2 mm LGA Module package
Si1144-AAGX Sensor Module Block Diagram
silabs.com | Smart. Connected. Energy-friendly.
• Temperature Range
• –40 to +85 °C
Rev. 0.9
Si1144-AAGX Data Short
Si1144-AAGX Information
1. Si1144-AAGX Information
Si1144-AAGX 4.9 x 2.85 x 1.3 mm LGA Module Application Schematic
Table 1.1. Recommended Operating Conditions
Parameter
Symbol
VDD Supply Voltage
VDD OFF Supply Voltage
Test Condition
VDD
VDD_OFF
Min
Typ
Max
Unit
1.71
—
3.6
V
1.0
V
50
mVpp
OFF mode
–0.3
VDD = 3.3 V
—
—
T
–40
25
85
°C
SCL, SDA, Input High Logic Voltage
I2CVIH
VDD x 0.7
—
VDD
V
SCL, SDA Input Low Logic
I2CVIL
0
—
VDD x 0.3
V
l
—
525
—
nm
VLED
4.1
—
5.0
V
—
—
250
mVpp
—
—
100
mVpp
VDD Supply Ripple Voltage1
1 kHz–10 MHz
Operating Temperature
Voltage
LED Emission Wavelength
LED Supply Voltage
LED Supply Ripple Voltage1
0–30 kHz
30 kHz–100 MHz
Start-Up Time
VDD above 1.71 V
25
—
—
ms
LED3 Voltage
Start-up
VDD x 0.7
—
—
V
Note:
1. Supply voltage ripple sensitivity depends on the voltage at the LEDx pins when turned on.
Table 1.2. Ordering Guide
Part Number
Package
LED Drivers
Si1144-AAGX-GMR
4.9 x 2.85 x 1.2 mm LGA Module
3 LED drivers, 1 green LED integrated
silabs.com | Smart. Connected. Energy-friendly.
Rev. 0.9 | 1
Smart.
Connected.
Energy-Friendly
Products
Quality
Support and Community
www.silabs.com/products
www.silabs.com/quality
community.silabs.com
Disclaimer
Silicon Laboratories intends to provide customers with the latest, accurate, and in-depth documentation of all peripherals and modules available for system and software implementers
using or intending to use the Silicon Laboratories products. Characterization data, available modules and peripherals, memory sizes and memory addresses refer to each specific
device, and "Typical" parameters provided can and do vary in different applications. Application examples described herein are for illustrative purposes only. Silicon Laboratories
reserves the right to make changes without further notice and limitation to product information, specifications, and descriptions herein, and does not give warranties as to the accuracy
or completeness of the included information. Silicon Laboratories shall have no liability for the consequences of use of the information supplied herein. This document does not imply
or express copyright licenses granted hereunder to design or fabricate any integrated circuits. The products must not be used within any Life Support System without the specific
written consent of Silicon Laboratories. A "Life Support System" is any product or system intended to support or sustain life and/or health, which, if it fails, can be reasonably expected
to result in significant personal injury or death. Silicon Laboratories products are generally not intended for military applications. Silicon Laboratories products shall under no
circumstances be used in weapons of mass destruction including (but not limited to) nuclear, biological or chemical weapons, or missiles capable of delivering such weapons.
Trademark Information
Silicon Laboratories Inc., Silicon Laboratories, Silicon Labs, SiLabs and the Silicon Labs logo, CMEMS®, EFM, EFM32, EFR, Energy Micro, Energy Micro logo and combinations
thereof, "the world’s most energy friendly microcontrollers", Ember®, EZLink®, EZMac®, EZRadio®, EZRadioPRO®, DSPLL®, ISOmodem ®, Precision32®, ProSLIC®, SiPHY®,
USBXpress® and others are trademarks or registered trademarks of Silicon Laboratories Inc. ARM, CORTEX, Cortex-M3 and THUMB are trademarks or registered trademarks of
ARM Holdings. Keil is a registered trademark of ARM Limited. All other products or brand names mentioned herein are trademarks of their respective holders.
Silicon Laboratories Inc.
400 West Cesar Chavez
Austin, TX 78701
USA
http://www.silabs.com