Wired smart door access control

Energy storage

A backup battery may be included in the design to provide seamless switching in case of unexpected power loss and also to supply additional current during peak load conditions. A battery management device can handle charging in systems that use a rechargeable battery. A battery gauge can be used to monitor the battery voltage.

Products

Battery charger ICs

BQ25071—1-cell, 1-A, Li-ion linear battery charger with 50mA LDO

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

BQ24780S—SMBus 1-4 cell Buck battery charge controller to support hybrid power boost mode

Battery protectors

BQ2970—Li-Ion/Li Polymer Advanced Single-Cell Battery Protector IC Family

Battery fuel gauges

BQ27427—Single-cell battery fuel gauge with pre-programmed chemistry and integrated sense resistor

Power muxes

TPS2115A—2.8-V to 5.5-V, 84-mΩ, 1.25-A, power mux with manual, automatic switchover and status outpu

Wide Vin DC/DC power supply

Wired electronic smart lock can be powered from an existing 12-V DC power source. A wide Vin DC/DC converter can be used to create a regulated DC voltage.

Products

Buck converters (integrated switch)

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

LMR33630—SIMPLE SWITCHER® 3.8V to 36V, 3A Synchronous Buck Converter With Ultra-Low EMI

TPS54231—3.5 to 28V Input, 2A, 570kHz Step-Down Converter with Eco-mode™

LMR36506-Q1—3-V to 65-V, 0.6-A buck converter optimized for size and light load efficiency

N-channel MOSFETs

CSD13381F4—12-V, N channel NexFET™ power MOSFET, single LGA 1 mm x 0.6mm, 180 mOhm, gate ESD protection

CSD17579Q3A—30-V, N channel NexFET™ power MOSFET, single SON 3 mm x 3 mm, 14.2 mOhm

CSD17577Q5A—30-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 5.8 mOhm

CSD17579Q5A—30-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 13.3 mOhm

P-channel MOSFETs

CSD25310Q2—-20-V, P channel NexFET™ power MOSFET, single SON 2 mm x 2 mm, 23.9 mOhm

CSD23280F3—-12-V, P channel NexFET™ power MOSFET, single LGA 0.6 mm x 0.7 mm, 116 mOhm, gate ESD protection

ESD protection diodes

TPD6E001—6 channel 1.5-pF, 5.5-V, ±8-kV ESD protection diode with 1-nA max leakage & VCC pin for USB 2.0

TPD4E001—Quad 1.5-pF, 5.5-V, ±8-kV ESD protection diode with 1-nA max leakage & VCC pin for USB 2.0

TPD2E001—Dual 1.5-pF, 5.5-V, ±8-kV ESD protection diode with 1-nA max leakage & VCC pin for USB 2.0

TPD4S009—Quad 0.8-pF, 5.5-V, ±8-kV ESD protection diode with VCC pin for High Speed Interfaces

TPD4S012—Quad 0.8-pF, 5.5-V, ±10-kV ESD protection diode with 15-V tolerant Vbus for USB Interface<

TPD2S017—2 channel 5.5-V, 1-pF, ±11kV ESD protection diode with low clamping and EMI filtering

Signal input/output protection

An ESD protection device may be required for protection on user buttons.

Products

ESD protection diodes

TPD6E001—6 channel 1.5-pF, 5.5-V, ±8-kV ESD protection diode with 1-nA max leakage & VCC pin for USB 2.0

TPD4E001—Quad 1.5-pF, 5.5-V, ±8-kV ESD protection diode with 1-nA max leakage & VCC pin for USB 2.0

TPD2E001—Dual 1.5-pF, 5.5-V, ±8-kV ESD protection diode with 1-nA max leakage & VCC pin for USB 2.0

TPD4S009—Quad 0.8-pF, 5.5-V, ±8-kV ESD protection diode with VCC pin for High Speed Interfaces

TPD4S012—Quad 0.8-pF, 5.5-V, ±10-kV ESD protection diode with 15-V tolerant Vbus for USB Interface<

TPD2S017—2 channel 5.5-V, 1-pF, ±11kV ESD protection diode with low clamping and EMI filtering

Input user interface

Input user interfaces include keypads and more. For designs seeking to eliminate physical buttons capacitive keypads may be used. Haptics can give tactile feedback to the user during button press.

Products

MSP430 microcontrollers

MSP430F5310—25 MHz MCU with 32KB Flash, 6KB SRAM, 10-bit ADC, comparator, DMA, UART/SPI/I2C, HW multiplier

MSP430FR5947—16 MHz MCU with 32KB FRAM, 1KB SRAM, AES, 12-bit ADC, comparator, DMA, UART/SPI/I2C, timer

MSP430FR2522—Capacitive touch MCU with 8 touch IO (16 sensors), 8KB FRAM, 2KB SRAM, 15 IO, 10-bit ADC

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

Supervisor & reset ICs

TPS3839—Ultra-low power, supply voltage supervisor

TPS386000—Open-drain, quad-supply voltage supervisors with programmable delay & watchdog timer

TPS3898—Single-channel, ultra-small, adjustable supervisor with active-low, open-drain output

TPS3850—Precision window supervisor for OV & UV monitoring with window watchdog timer & programmable delay

Output user interface

Visual and audio notifications allow the smart lock to interact with the user. An audio speaker operated using the microcontroller?s PWM output or an audio amplifier allows the design to generate beeps, tones, and audible voice notifications. An RGBW LED driver can be used to display different colors and patterns.

Products

RGB LED drivers

LP5812—4 x 3 matrix RGB LED driver with I2C and auto animation control

LP5811—Synchronous boost 4-channel RGBW LED driver with I2C and auto animation control

LP5813—Synchronous boost 4 x 3 matrix RGB LED driver with I2C and auto animation control

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

TLC5971—12-channel, 16-bit ES-PWM RGB LED driver with 3.3V Linear Regulator

TLC5955—48ch, 16bit PWM LED driver with dot-correction, brightness control, open/Short Detection

Backlight LED drivers

TPS61169—TPS61169 38-V high-current Boost WLED driver

Speaker amps

TAS2110—6.1W mono digital input Class-D speaker amp with integrated 11V Class-H boost

LM4951—1.8-W, mono, 2.7- to 9-V, analog input Class-AB audio amplifer

TPA6211A1—3.1-W, mono, analog input Class-AB audio amplifier

TAS2572—6.6W digital-input smart amplifier with I/V sense and integrated 13V Class-H boost

Serial interface

RS232, RS485 & RS422 are most common serial interfaces in wired electronic smart lock.

Products

RS-485 & RS-422 transceivers

SN65HVD75—3.3-V half-duplex RS-485 transceiver with IEC ESD, 20 Mbps

SN65HVD1781-Q1—Automotive Catalog 70-V Fault-Protected RS-485 Transceivers

SN65HVD82—5V-Supply RS-485 with IEC ESD Protection

SN65HVD1786—70-V Fault-Protected RS-485 with -20 to +25 common mode

RS-232 transceivers

MAX3221E—3- to 5.5-V single channel 250kbps RS-232 line driver/receiver with +/-15-kV IEC-ESD protection

TRS3232E—3- to 5.5-V dual channel 250kbps RS-232 line driver/receiver with +/-15-kV IEC-ESD protection

Analog switches & muxes

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

Motor driver

When credentials are verified, an electronic door lock operates a motor to grant access to the user. A motor driver device allows the microcontroller to operate the motor. Brushed DC motors, stepper motors, and brushless DC motors are typically used in electronic door locks.

Products

Brushed DC (BDC) motor drivers

DRV8212P—12-V, 3-A H-bridge motor driver, PWM control with low power sleep mode

DRV8874—40-V, 6-A H-bridge motor driver with integrated current sensing feedback

DRV8838—11-V, 1.8-A H-bridge motor driver with phase/enable control

DRV8210P—12-V, 1-A H-bridge motor driver, PWM control with low power sleep mode

Stepper motor drivers

DRV8411—1.65-V to 11-V, 4-A, dual H-bridge motor driver with current regulation

Wired interface signal input/output protection

ESD protection devices can be used to protect wired interfaces.

Products

ESD protection diodes

TPD6E001—6 channel 1.5-pF, 5.5-V, ±8-kV ESD protection diode with 1-nA max leakage & VCC pin for USB 2.0

TPD4E001—Quad 1.5-pF, 5.5-V, ±8-kV ESD protection diode with 1-nA max leakage & VCC pin for USB 2.0

TPD2E001—Dual 1.5-pF, 5.5-V, ±8-kV ESD protection diode with 1-nA max leakage & VCC pin for USB 2.0

TPD4S009—Quad 0.8-pF, 5.5-V, ±8-kV ESD protection diode with VCC pin for High Speed Interfaces

Tamper detection

An anti-tampering mechanism is needed to detect unpermitted access to the electronic smart lock. A Hall effect sensor can be used to detect when the electronic smart lock enclosure has been opened.

Products

Light sensors

OPT3001—Digital ambient light sensor (ALS) with high-precision human-eye response

Hall-effect latches & switches

DRV5013—High voltage (up to 38-V), high bandwidth (30-kHz) Hall effect latch

DRV5033—High voltage (up to 38V), high bandwidth (up to 30 kHz) omnipolar switch

DRV5032—Low power (5 Hz, <1µA), low voltage (up to 5.5V) switch

Position sensing

Detecting the lock position is required to calibrate the smart lock lock/unlock position. A Hall effect sensor and optical sensor can be used to detect the position of the lock in a magnetic door latch design. An inductive switch is a choice for designs using inductive gear counting. Finally, an accelerometer allows designs to monitor a mechanically-connected dead bolt.

Products

Precision op amps (Vos<1mV)

TLV369—Single, 800-nA, 1.8-V, RRIO op amp with zero-crossover distortion for cost-sensitive application

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

General-purpose op amps

TLV9064—Quad, 5.5-V, 10-MHz, RRIO operational amplifier for cost-optimized applications

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

TLV8802—Dual, 5.5-V, 6-kHz, ultra low quiescent current (320-nA), RRIO operational amplifier

TLV8544—Quad, 3.6-V, 8-kHz, ultra low quiescent current (500-nA), RRIO operational amplifier

Analog current-sense amplifiers

INA199—26V, bi-directional current sense amplifier

Hall-effect latches & switches

DRV5013—High voltage (up to 38-V), high bandwidth (30-kHz) Hall effect latch

DRV5033—High voltage (up to 38V), high bandwidth (up to 30 kHz) omnipolar switch

DRV5032—Low power (5 Hz, <1µA), low voltage (up to 5.5V) switch