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 dy-
namic 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 opera-
tion from 1.71 to 3.6 V over the –40 to +85 °C temperature range.
Applications:
• Fitness Bands
• Smart Watches
• Other Wearables
• Healthcare
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
• 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
A
M
U
X
ADC
Filter
LED
Drivers
LED1
LEDA
LED1
• 25.6 μs LED “on” time keeps total power consumption duty cycle
low without compromising performance or noise immunity
• < 500 nA standby current
• Internal and external wake support
• Built-in voltage supply monitor and power-on reset controller
• I
2
C serial communications
• Up to 3.4 Mbps data rate
LED3
LED2
LED3
LED2
Visible
Infrared
Digital Sequencer & Control Logic
Registers
Oscillator
GND
INT
SCL
SDA
I
2
C
• Slave mode hardware address decoding (0x5A)
• 10-lead 4.9 X 2.85 x 1.2 mm LGA Module package
• Temperature Range
• –40 to +85 °C
Si1144-AAGX Sensor Module Block Diagram
silabs.com
| Smart. Connected. Energy-friendly.
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
V
DD
Supply Voltage
V
DD
OFF Supply Voltage
V
DD
Supply Ripple Voltage
1
Symbol
V
DD
V
DD_OFF
OFF mode
V
DD
= 3.3 V
1 kHz–10 MHz
Operating Temperature
SCL, SDA, Input High Logic Voltage
SCL, SDA Input Low Logic
Voltage
LED Emission Wavelength
LED Supply Voltage
LED Supply Ripple Voltage
1
l
VLED
0–30 kHz
30 kHz–100 MHz
—
—
Start-Up Time
LED3 Voltage
V
DD
above 1.71 V
Start-up
25
V
DD
x 0.7
—
—
—
—
250
100
—
—
mVpp
mVpp
ms
V
—
4.1
525
—
—
5.0
nm
V
T
I
2
C
VIH
I
2
C
VIL
–40
V
DD
x 0.7
0
25
—
—
85
V
DD
V
DD
x 0.3
°C
V
V
Test Condition
Min
1.71
–0.3
—
—
Typ
—
Max
3.6
1.0
50
Unit
V
V
mVpp
Note:
1. Supply voltage ripple sensitivity depends on the voltage at the LEDx pins when turned on.
Table 1.2. Ordering Guide
Part Number
Si1144-AAGX-GMR
Package
4.9 x 2.85 x 1.2 mm LGA Module
LED Drivers
3 LED drivers, 1 green LED integrated
silabs.com
| Smart. Connected. Energy-friendly.
Rev. 0.9 | 1
Smart.
Connected.
Energy-Friendly
Products
www.silabs.com/products
Quality
www.silabs.com/quality
Support and Community
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
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
京公网安备 11010802033920号
EEWORLD
