Non-isolated DC/DC power supply
Electronic door locks are primarily battery powered. High-efficiency buck converters provide the voltage rails needed by the system components and maximize battery life. Boost converters provide higher voltage rails to operate motors and sourcing LED arrays. Linear regulators can also be used to reduce BOM cost at the expense of battery life.
Products
Analog switches & muxes
TMUX1204—5-V, 4:1, 1-channel, general-purpose analog multiplexer
TMUX1237—5-V, 2:1 (SPDT) general purpose switch with no overshoot when switching inputs
TMUX1111—3-pA on-state leakage current, 5-V, 1:1 (SPST), 4-channel precision switch (4 active low)
TS5A3159A—1-Ω, 5-V, 2:1 (SPDT), 1-channel general-purpose analog switch with powered-off protection
Energy storage
A battery gas gauge device can be used to monitor the battery voltage.
Products
Battery charger ICs
BQ25120A—300-mA linear battery charger with Power Path, integrated LDO and buck converter 1.8V default output
BQ25504—Ultra Low Power Boost Converter with Battery Management for Energy Harvester | Nano-Power Management
Signal input/output protection
An ESD protection device may be required for protection on user buttons.
Products
ESD protection diodes
ESD321—0.9pF 3.6V ±30kV ESD protection diode with 6.8V 16A TLP clamping for USB 2.0
TPD4F003—4 channel 5.5-V, ±12kV ESD protection & EMI Filter with 200-MHz -3-dB
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
TPD2E001—Dual 1.5-pF, 5.5-V, ±8-kV ESD protection diode with 1-nA max leakage & VCC pin for USB 2.0
TPD1E10B06—12-pF, ±5.5V, ±30-kV ESD protection diode in 0402 and SOD-523 package
TPD1E1B04—1-pF, ±3.6-V, ±30-kV ESD protection diode with 6.3-A 8/20-uS surge & low clamping in 0402 packa
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
Supervisor & reset ICs
TPS38-Q1—Automotive 65-V dual-channel supervisor with ultra-low quiescent current and time-delay function
TPS3840—Nanopower high-input voltage supervisor with manual reset and programmable-reset time delay
LM809—3-pin voltage supervisor (reset IC) with active-low, push-pull reset for supply monitoring
MSP430 microcontrollers
MSP430F5324—25 MHz MCU with 64KB Flash, 6KB SRAM, 12-bit ADC, comparator, DMA, UART/SPI/I2C, HW multiplier
MSP430FR5994—16 MHz MCU with 256KB FRAM, 8KB SRAM, LEA, AES, 12-bit ADC , comparator, DMA, 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
MSP430F2370—16 MHz MCU with 32KB Flash, 2KB SRAM, comparator, I2C/SPI/UART, HW multiplier
MSP430F5528—25 MHz MCU with 128KB Flash, 8KB SRAM, 12-bit ADC, comparator, DMA, UART/SPI/I2C, USB, HW multiplier
MSP430G2131—16 MHz MCU with 1KB Flash, 128B SRAM, 10-bit ADC, SPI/I2C, timer
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
LP5012—12-channel I2C constant-current RGB LED driver
TLC59116—16-bit Fast-Mode Plus (FM+) I2C-Bus constant-current LED sink driver
LP5813—Synchronous boost 4 x 3 matrix RGB LED driver with I2C and auto animation control
LP5036—36-channel I2C constant current RGB LED driver
LP5811—Synchronous boost 4-channel RGBW LED driver with I2C and auto animation control
Backlight LED drivers
TPS61043—TPS61043: constant current LED driver
Speaker amps
TPA2010D1—2.5-W, analog input Class-D audio amp with variable gain & short-circuit protection
TPA6211A1—3.1-W, mono, analog input Class-AB audio amplifier
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
Linear Hall-effect sensors
TMAG5253—Low-power linear Hall-effect sensor with enable pin in ultrasmall X2SON package
DRV5053—High voltage (up to 38V), linear hall effect sensor
Light sensors
OPT3001—Digital ambient light sensor (ALS) with high-precision human-eye response
Hall-effect latches & switches
TMAG5231—Low-power, low-voltage (1.65 V to 5.5 V) Hall-effect switch
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
DRV5013—High voltage (up to 38-V), high bandwidth (30-kHz) Hall effect latch
Digital processing
A microcontroller performs basic functions such as keypad monitoring, electronic actuator control, and authentication. 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
Arm Cortex-M0+ MCUs
MSPM0L1105—32-MHz Arm® Cortex®-M0+ MCU with 32-KB flash, 4-KB SRAM, 12-bit ADC
MSPM0G3507—80MHz Arm M0+ MCU, 128KB Flash, 32KB SRAM, 2×12bit 4Msps ADC, DAC, 3×COMP, 3×op-amp, CAN-FD, MATHACL
MSPM0G3107—80MHz Arm M0+ MCU, 128KB Flash, 32KB SRAM, 2×12bit 4Msps ADC, op-amp, CAN-FD
MSPM0L1306—32-MHz Arm® Cortex®-M0+ MCU with 64-KB flash, 4-KB SRAM, 12-bit ADC, comparator, OPA
MSP430 microcontrollers
MSP430F5324—25 MHz MCU with 64KB Flash, 6KB SRAM, 12-bit ADC, comparator, DMA, UART/SPI/I2C, HW multiplier
MSP430FR5994—16 MHz MCU with 256KB FRAM, 8KB SRAM, LEA, AES, 12-bit ADC , comparator, DMA, 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
MSP430F1612—8 MHz MCU with 55KB Flash, 5KB SRAM, 12-bit ADC, Dual 12-bit DAC, comparator, DMA, I2C/SPI/UART
I2C general-purpose I/Os (GPIOs)
TCAL9539—16-bit low-voltage I²C-bus and SMBus I/O expander with interrupt, reset and agile I/O configuration
TCA6424A—24-bit translating 1.65- to 5.5-V I2C/SMBus I/O expander with interrupt, reset & config registers
TCA6408A—8-bit translating 1.65- to 5.5-V I2C/SMBus I/O expander with interrupt, reset & config registers
TCA8418—18-bit 1.65- to 3.6-V 1MHz I2C/SMBus keypad scanner with interrupt, reset & 80 key support
TCA9535—16-bit 1.65- to 5.5-V I2C/SMBus I/O expander with interrupt & config registers
Auto-direction voltage translators
TXS0102—2-Bit Bidirectional Voltage-Level Shifter for Open-Drain and Push-Pull Application
TXB0104—4-Bit Bidirectional Voltage-Level Shifter with Auto Direction Sensing and +/-15 kV ESD Protect
TXB0108—8-Bit Bidirectional Voltage-Level Shifter with Auto Direction Sensing and +/-15-kV ESD Protect
Noninverting buffers & drivers
SN74LVC1G125—Single 1.65-V to 5.5-V buffer with 3-state outputs
SN74LVC1G126—Single 1.65-V to 5.5-V buffer with 3-state outputs
SN74LVC1G17—Single 1.65-V to 5.5-V buffer with Schmitt-Trigger inputs
AND gates
SN74AUP1G08—1-ch, 2-input 0.8-V to 3.6-V low power (< 1uA) AND gate
Wireless interface
For applications where high integration or small solution size are key concerns, integrated microcontroller and radio topologies may be used. In this topology the application layer, wireless stack and RF radio functionality are all on one chip. An MCU may also be integrated for additional resource management.
Products
Low-power 2.4-GHz products
CC2340R5—SimpleLink™ 32-bit Arm® Cortex®-M0+ Bluetooth® Low Energy wireless MCU with 512-kB flash
CC2674R10—SimpleLink™ Arm® Cortex®-M33 multiprotocol 2.4-GHz wireless MCU with 1-MB flash
CC2652R7—SimpleLink™ Arm® Cortex®-M4F multiprotocol 2.4-GHz wireless MCU with 704-kB Flash
Sub-1 GHz wireless MCUs
CC1312R—SimpleLink™ 32-bit Arm Cortex-M4F Sub-1 GHz wireless MCU with 352kB Flash
Wi-Fi products
CC3300—SimpleLink™ Wi-Fi 6 companion IC
CC3120—SimpleLink™ Wi-Fi® Network Processor, Internet-of-Things Solution for MCU Applications
CC3220S—SimpleLink™ 32-bit Arm Cortex-M4 Wi-Fi® wireless MCU with secure boot and 256kB RAM
Other wireless products
CC2592—2.4 GHz range extender with up to +22 dBm output power
TRF7960A—TRF7960A Multi-Protocol Fully Integrated 13.56-MHz RFID Reader/Writer IC
CC2500—Low Cost, Low-Power 2.4 GHz RF Transceiver Designed for Low-Power Wireless Apps in the 2.4 GHz ISM B
TRF7961—TRF7961 Fully Integrated 13.56-MHz RFID Reader/Writer IC for ISO15693
Sub-1 GHz transceivers
CC1120—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
Battery charger ICs
BQ25120A—300-mA linear battery charger with Power Path, integrated LDO and buck converter 1.8V default output
BQ25504—Ultra Low Power Boost Converter with Battery Management for Energy Harvester | Nano-Power Management
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
Stepper motor drivers
DRV8411—1.65-V to 11-V, 4-A, dual H-bridge motor driver with current regulation
Brushed DC (BDC) motor drivers
DRV8212P—12-V, 3-A H-bridge motor driver, PWM control with low power sleep mode
DRV8214—11-V 4-A H-bridge motor driver with sensorless stall detection, ripple counting and I²C interface
DRV8210P—12-V, 1-A H-bridge motor driver, PWM control with low power sleep modeDRV8210P—12-V, 1-A H-bridge motor driver, PWM control with low power sleep mode
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
Linear Hall-effect sensors
TMAG5253—Low-power linear Hall-effect sensor with enable pin in ultrasmall X2SON package
DRV5053—High voltage (up to 38V), linear hall effect sensor
Hall-effect latches & switches
TMAG5231—Low-power, low-voltage (1.65 V to 5.5 V) Hall-effect switch
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
DRV5013—High voltage (up to 38-V), high bandwidth (30-kHz) Hall effect latch
General-purpose op amps
TLV9152—Dual, 16-V, 4.5-MHz, low-power operational amplifier
TLV9001—One-channel, 1-MHz rail-to-rail input and output 1.8-V to 5.5-V operational amplifier
TLV9002—Dual, 5.5-V, 1-MHz, RRIO operational amplifier for cost-optimized applications
OPA2991—Dual, 40-V, 4.5-MHz, low-power operational amplifier
TLV9064—Quad, 5.5-V, 10-MHz, RRIO operational amplifier for cost-optimized applications
Analog current-sense amplifiers
INA186—40-V, bidirectional, high-precision current sense amplifier with picoamp input bias & ENABLE
INA280—2.7-V to 120-V, 1.1-MHz, high-precision current sense amplifier in small (SC-70) package
INA212—26V, bi-directional, high-precision current sense amplifier
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
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