Glass break detector

Overview

Description

Related applications

Our integrated circuits and reference designs help you create a glass break detector design that maintains long battery life while continuously listening for the sound of shattered glass.

Design requirements

Glass break detectors often require:

Amplification and filtering of both low-frequency (< 300 Hz) and subsequent high-frequency (> 9kHz) glass break sounds.

Reduced maintenance through battery-powered designs with long battery life.

Ultra-low-power wireless communication with 2.4-GHz and Sub-1-GHz networks.

Non-isolated DC/DC power supply

Glass break detectors may be powered from a battery or a 12V DC wired power source. Buck converters with high light-load efficiency may be considered for designs prioritizing maximum battery life. For designs operating from a low voltage battery, boost converters may be used instead. Linear regulators (LDOs) are a good option for simple designs. LDOs also enable added functionalities including EMI filtering.

Products

Buck converters (integrated switch)

TPS62802—1.75-V to 5.5-V input, 1-A ultra-low IQ step-down converter in 0.7-mm x 1.05-mm chip scale package

TPS62801—1.75-V to 5.5-V input, 1-A ultra-low IQ step-down converter in 0.7-mm x 1.05-mm chip scale package

TPS62840—60-nA quiescent current (IQ), 1.8-V to 6.5-VIN, high-efficiency 750-mA step-down converter

Linear & low-dropout (LDO) regulators

LP3982—300-mA, high-accuracy, low-dropout voltage regulator with power good & enable

LP2985—150-mA, 16-V, low-dropout voltage regulator with enable

TPS7A24—200-mA, 18-V, ultra-low-IQ, low-dropout (LDO) voltage regulator with enable

TPS7A25—300-mA, 18-V, ultra-low-IQ, high-accuracy, adjustable low-dropout voltage regulator with power good

Boost converters (integrated switch)

TPS61040—28-V, 400-mA Switch Boost Converter in SOT-23 for LCD and White LED Applications

TPS61220—0.7-VIN, adjustable output voltage boost converter with 5.5-μA quiescent current

N-channel MOSFETs

CSD15571Q2—20-V, N channel NexFET™ power MOSFET, single SON 2 mm x 2 mm, 19.2 mOhm

CSD19537Q3—100-V, N channel NexFET™ power MOSFET, single SON 3 mm x 3 mm, 14.5 mOhm

CSD18541F5—60-V, N channel NexFET™ power MOSFET, single LGA 1.5 mm x 0.8mm, 65 mOhm, gate ESD protection

P-channel MOSFETs

CSD23381F4—-12-V, P channel NexFET™ power MOSFET, single LGA 0.6 mm x 1 mm, 175 mOhm, gate ESD protection

Shunt voltage references

ATL431LI—Low-IQ programmable shunt regulator offered in an ultra-small DQN package

Flyback controllers

UCC28881—700-V Lowest Quiescent current off-line switcher

Analog switches & muxes

TS5A3159A—1-Ω, 5-V, 2:1 (SPDT), 1-channel general-purpose analog switch with powered-off protection

Energy storage

A glass break detector may harvest energy from a window or light source. An ultra low power harvester power management IC can be used to charge a super capacitor or rechargeable battery using a solar cell. A load switch device can be used to completely power off parts of the circuit and further increase battery life.

Products

Battery charger ICs

BQ25185—1-cell, 1-A stand-alone linear battery charger with power path and solar input support

BQ21061—500-mA 1-cell linear charger with 10-nA ship mode, power-path, regulated system voltage and LDO

Analog switches & muxes

TS5A3159A—1-Ω, 5-V, 2:1 (SPDT), 1-channel general-purpose analog switch with powered-off protection

Glass break detector analog front end

An acoustic glass break detector (GBD) analog front-end amplifies and filters the output of a narrowband microphone. The GBD analog front-end filters are tuned specifically for glass shatter frequencies and a comparator may be used to detect when sound levels go above a specific threshold. Additionally, the system microcontroller analyzes the output of the GBD analog front-end and uses pattern recognition to match to specific sound signatures and reject imposter signatures.

Products

General-purpose op amps

TLV8542—Dual, 3.6-V, 8-kHz, ultra-low quiescent current (500-nA), RRIO operational amplifier

TLV8541—Single, 3.6-V, 8-kHz, ultra-low quiescent current (550-nA), RRIO operational amplifier

TLV9042—Dual, 5.5-V, 350-kHz, Ultra-low 1.2-V, low quiescent current (10-μA) op amp

Precision op amps (Vos<1mV)

OPA376—Precision (0.025mV), low noise (7.5nV/rtHz), low quiescent current (760uA) op amp

Comparators

TLV7041—Nanopower, small size comparator with open-drain output

TLV7032—Dual nanopower comparator with push-pull output

LM2903—Dual differential comparator

Precision ADCs

ADS7042—12-Bit 1MSPS Ultra-Low-Power Ultra-Small-Size SAR ADC With SPI Interface

Output user interface

The output user interface may consist of a simple LED to indicate system status. An LED driver is an option for flashing a single color LED.

Products

RGB LED drivers

TLC59116—16-bit Fast-Mode Plus (FM+) I2C-Bus constant-current LED sink driver

Digital processor

A microcontroller monitors the glass break detector sensor and sends intrusion information to a control panel. The design can use a dedicated microcontroller or a single system-on-chip solution which combines the microcontroller and radio on a single device.

Products

Sub-1 GHz wireless MCUs

CC1312R—SimpleLink™ 32-bit Arm Cortex-M4F Sub-1 GHz wireless MCU with 352kB Flash

CC1312R7—SimpleLink™ Arm® Cortex®-M4F multiprotocol Sub-1 GHz wireless MCU with 704-kB Flash

Sub-1 GHz transceivers

CC1120—High performance Sub-1 GHz wireless transceiver for narrowband systems

CC1125—Ultra-high performance Sub-1 GHz wireless transceiver for narrowband systems

CC1101—Low-power Sub-1 GHz wireless transceiver

CC110L—Value line Sub-1 GHz wireless transceiver

Low-power 2.4-GHz products

CC2651R3—SimpleLink™ 32-bit Arm® Cortex®-M4 single-protocol 2.4-GHz wireless MCU with 352-kB flash

CC2520—Second generation 2.4 GHz ZigBee/IEEE 802.15.4 wireless transceiver

CC2642R—SimpleLink™ 32-bit Arm Cortex-M4F Bluetooth® Low Energy wireless MCU with 352kB Flash

CC2640—SimpleLink™ 32-bit Arm Cortex-M3 Bluetooth® Low Energy wireless MCU with 128kB Flash

MSP430 microcontrollers

MSP430G2553—16 MHz MCU with 16KB Flash, 512B SRAM, comparator, UART/SPI/I2C, timer

MSP430F1612—8 MHz MCU with 55KB Flash, 5KB SRAM, 12-bit ADC, Dual 12-bit DAC, comparator, DMA, I2C/SPI/UART

MSP430F2274—16 MHz MCU with 32KB Flash, 1KB SRAM, 10-bit ADC, 2 OpAmp, I2C/SPI/UART

MSP430F5438A—25-MHz MCU with 256-KB flash, 16-KB SRAM, 12-bit ADC, DMA, UART/SPI/I2C, timer, HW multiplier

Real-time clocks (RTCs) & timers

LMC555—World’s smallest 555 timer with low power, high accuracy and a Fmax of 3MHz

NA555—Precision Timers

TPL5111—Ultra low power system timer (35 nA) for power gating in duty cycled applications

Wireless interface

The wireless interface in the design allows the glass break detector to communicate with a central location. A system-on-chip solution which integrates a microcontroller and radio allows designs to run the application layer and wireless protocol stack on one chip. A microcontroller with dedicated RF radio topology allows designs to separate the wireless protocol stack from the application layer...

Products

Sub-1 GHz wireless MCUs

CC1312R—SimpleLink™ 32-bit Arm Cortex-M4F Sub-1 GHz wireless MCU with 352kB Flash

CC1312R7—SimpleLink™ Arm® Cortex®-M4F multiprotocol Sub-1 GHz wireless MCU with 704-kB Flash

Sub-1 GHz transceivers

CC1120—High performance Sub-1 GHz wireless transceiver for narrowband systems

CC1125—Ultra-high performance Sub-1 GHz wireless transceiver for narrowband systems

CC110L—Value line Sub-1 GHz wireless transceiver

CC1101—Low-power Sub-1 GHz wireless transceiver

Low-power 2.4-GHz products

CC2651R3—SimpleLink™ 32-bit Arm® Cortex®-M4 single-protocol 2.4-GHz wireless MCU with 352-kB flash

CC2520—Second generation 2.4 GHz ZigBee/IEEE 802.15.4 wireless transceiver

CC2642R—SimpleLink™ 32-bit Arm Cortex-M4F Bluetooth® Low Energy wireless MCU with 352kB Flash

Other wireless products

CC2500—Low Cost, Low-Power 2.4 GHz RF Transceiver Designed for Low-Power Wireless Apps in the 2.4 GHz ISM B

CC2530-RF4CE—Zigbee, IEEE 802.15.4 and RF4CE wireless MCU with 256kB Flash and 8kB RAM

CC2531-RF4CE—Zigbee, IEEE 802.15.4 and RF4CE wireless MCU with up to 256kB Flash and 8kB RAM

Relay system

A relay system allows the glass break detector to operate an alarm. A mechanical relay system provides the lowest cost solution, but generates loud clicking noises and has physical contacts that wear out. A solid-state relay (SSR) system performs the same function without the use of mechanical parts. A digital SSR system consisting of control logic and MOSFET switches provides a small-footprint and low-BOM-count solution.

Products

JK flip-flops

SN74HC112—Dual J-K Negative-Edge-Triggered Flip-Flops With Clear and Preset

Inverting buffers & drivers

SN74LVC1G04—Single 1.65-V to 5.5-V inverter

SN74AUP1G14—Single 0.8-V to 3.6-V low power inverter with Schmitt-Trigger inputs

SN74AUP3G14—3-ch, 0.8-V to 3.6-V low power inverters with Schmitt-Trigger inputs

AND gates

SN74LVC1G08—1-ch, 2-input 1.65-V to 5.5-V 32 mA drive strength AND gate

SN74AUP2G08—2-ch, 2-input 0.8-V to 3.6-V low power (< 1uA) AND gate

Noninverting buffers & drivers

SN74AUP1G17—Single 0.8-V to 3.6-V low power buffer with Schmitt-Trigger inputs

D-type flip-flops

SN74AUP1G74—Low-Power Single Positive-Edge-Triggered D-Type Flip-Flop

SN74LVC1G74—Single Positive-Edge-Triggered D-Type Flip-Flop With Clear and Preset

N-channel MOSFETs

CSD15571Q2—20-V, N channel NexFET™ power MOSFET, single SON 2 mm x 2 mm, 19.2 mOhm

CSD19537Q3—100-V, N channel NexFET™ power MOSFET, single SON 3 mm x 3 mm, 14.5 mOhm

CSD18541F5—60-V, N channel NexFET™ power MOSFET, single LGA 1.5 mm x 0.8mm, 65 mOhm, gate ESD protection

P-channel MOSFETs

CSD23381F4—-12-V, P channel NexFET™ power MOSFET, single LGA 0.6 mm x 1 mm, 175 mOhm, gate ESD protection

Wired interface

A glass break detector may include an RS-485 wired interface for communicating with a control panel. An RS-485 transceiver may be used in the design to interface the system microcontroller to the network bus.

Products

RS-485 & RS-422 transceivers

SN65HVD3082E—Half-duplex RS-485 transceiver

SN65HVD24—Extended Common-mode RS-485 Transceiver

SN65HVD3088E—Low-power half-duplex RS-485 transceiver

SN65HVD96—SymPol Transceiver

Signal input/output protection

A number of ESD protection devices can be used to protect wired interfaces.

Products

ESD protection diodes

TPD6F003—6 channel 5.5-V, ±12kV ESD protection & EMI Filter with 200-MHz -3-dB

TPD1E10B06—12-pF, ±5.5V, ±30-kV ESD protection diode in 0402 and SOD-523 package

TPD1E05U06—0.5-pF, 5.5-V, ±12-kV ESD protection diode in 0402 package for High Speed Interfaces

TPD1E1B04—1-pF, ±3.6-V, ±30-kV ESD protection diode with 6.3-A 8/20-uS surge & low clamping in 0402 packa