Si1144-A10 Data Short

Si1144-A10 Data Short
Optical Heart Rate Sensor Chip with I2C Interface and HR Measurement Software Library
The Si1144-A10 is a low-power, reflectance-based, heart rate sensor device combined with
a Cortex-M ARM code library containing the heart rate extraction algorithm. The heart rate
algorithm provided in the library includes motion compensation using an external accelerometer and is optimized to be accurate even in the difficult area of the wrist.
This optical heart rate sensor chip includes an I2C digital interface, a programmable-event
interrupt output, an analog-to-digital converter, integrated high sensitivity photodiodes, host
communications processor, and three integrated LED drivers capable of 6 to 360 mA output
current. The Si1144-A10 offers excellent performance under a wide dynamic range and a
variety of light sources from 525 nm to 940 nm. The Si1144-A10 devices are provided in a
10-lead DFN package and are capable of operation from 1.71 to 3.6 V over the –40 to
+85°C temperature range.
• Accurate sensing optimized for reading
heart rate from the wrist
• Integrated heart rate IC
• High-sensitivity photodiode
• Low-noise analog-to-digital converter
and filtering
• LED drivers
• Host communications and interrupts
• Programmable from 6 to 360 mA
each
• Low power consumption
• 1.71 to 3.6 V supply voltage
Oscillator
Regulator
• Flexible duty cycle optimizes the
power consumption.
• < 500 nA standby current
LIGHT
MUX
.
.
ADC
Signal
Processor
and
Control
Temp
LED
Drivers
(Currrent
Sinks)
LED1
LED2
LED3 *
• Internal and external wake support
• Built-in voltage supply monitor and
power-on reset controller
• I2C serial communications
• Slave mode hardware address
decoding (0x5A)
• Small outline 10-lead 2 mm x 2 mm
DFN
INT
SCL
• Optional movement compensation
uses external accelerometer data
• Three independent regulated LED
drivers
• Scale cost-sensitive single LED
systems to high performance three
LED systems
Photodiodes
SDA
• Sensor with ARM Cortex-M code
library for extracting HR
• Broad spectral sensitivity supports
green through 940 nm LEDs
Applications:
• Fitness Bands
• Smart Watches
• Other Wearables
• Healthcare
VDD
KEY FEATURES
I2C
Engine
• Temperature Range of –40 to +85 °C
* Pull up to VDD with 47 kOhm resistor
Si1144-A10 Sensor Block Diagram
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Rev. 0.9
Si1144-A10 Data Short
Si1144-A10 Information
1. Si1144-A10 Information
Si1144-A10 2 mm x 2 mm DFN 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 Voltage
I2CVIL
0
—
VDD x 0.3
V
l
—
525
—
nm
VLED
4.1
—
5.0
V
0–30 kHz
—
—
250
mVpp
30 kHz–100 MHz
—
—
100
mVpp
Start-Up Time
VDD above 1.71 V
25
—
—
ms
LED3 Voltage
Start-up
VDD x 0.7
—
—
V
VDD Supply Ripple Voltage1
1 kHz–10 MHz
Operating Temperature
LED Emission Wavelength
LED Supply Voltage
LED Supply Ripple Voltage1
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-A10-GMR
2 mm x 2 mm DFN
3 LED drivers
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