Texas Instruments TIDA-010941 Design Manual

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Design Guide: TIDA-010941
Smart Analog Sensor Interface for Smoke Detection With
Ambient Light Cancellation Reference Design
Description
This reference design provides a low BOM cost
smoke detector design that passes UL217 9
sensitivity and fire room tests. Using a modulation-
based photoelectric architecture, this reference design
is able to achieve high rejection of ambient light
for application in chambered or chamberless smoke
detection. This design also has a high signal-to-
noise ratio (SNR) for the entire signal chain that
enables robust algorithms for reduced false alarms in
smoke detector applications and particulate sensing
in air-quality sensing applications. This design makes
use of the low-power modes of the MSPM0L1306
microcontroller to achieve 10 years of battery life from
a 9-V alkaline battery.
Resources
TIDA-010941
MSPM0L1306, TLV9062S
TPS7A2433, TPS7A2450
TS5A623157, SN74LVC1G66
HDC2010
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Features
• Modulation-based sensing signal chain with
ambient light rejection
• Advanced compressive sensing technique for low-
power operation
• Dual-wavelength, dual-angle optical design for
reduced false alarm smoke detection and
particulate air-quality sensing
• Signal chain SNR of 77 dB (300 pulses)
• Total current consumption of 5.8 μA (16 pulses,
0.1-Hz output data rate (ODR)) for 10+ years
battery life with 9-V alkaline battery
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• Passes UL217 9 edition sensitivity and fire room
tests
Applications
• Smoke and heat detector
• Wireless environmental sensor
• Air purifier and humidifier
• Air conditioner indoor unit
TS5A623157
Vref
3.3 V
TLV9062S
OPA0
BPF
PD
M0L1306
Smart Analog Sensor Interface for Smoke Detection With Ambient Light
Description
TPS7A2405 9-V VBAT
5 V
3.3 V TPS7A2433
5 V
LED
SN74LVC1G66
Demodulation
control Integrator reset
IR
Integrator
TIMER
OPA1
Pulse Pattern &
12-bit
Frequency
Smoke detection
ADC
Control
Particle size sensing
Mass concentration
I2C
Temperature compensation
HDC2010
Temp/Humidity
Compressive sensing
Cancellation Reference Design
5 V
Blue
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