TCA8418E Series
18-bit 1.65- to 3.6-V 1MHz I2C/SMBus keypad scanner with interrupt, reset & 80 key support
Manufacturer: Texas Instruments
Catalog
18-bit 1.65- to 3.6-V 1MHz I2C/SMBus keypad scanner with interrupt, reset & 80 key support
Key Features
• Operating Power-Supply Voltage Range of 1.65-Vto 3.6-V±15-kV Human Body Model High Voltage ESD(GPIO lines)Supports 80 Buttons With Use of 18 GPIOsSupports QWERTY Keypad Operation Plus GPIOExpansionLow Standby (Idle) Current Consumption: 3 µASupports 1-MHz Fast Mode Plus I2C Bus10-Byte FIFO to Store 10 Key Presses andReleasesOpen-Drain Active-Low Interrupt OutputIntegrated Debounce Time of 50 µsSchmitt-Trigger Action Allows Slow InputTransition and Better Switching Noise Immunity atthe SCL and SDA Inputs: Typical Vhysat 1.8 V is0.18 VLatch-Up Performance Exceeds 200 mA PerJESD 78, Class IIVery Small PackageWCSP(YFP): 2 mm × 2 mm; 0.4 mm pitchAPPLICATIONSSmart PhonesTabletsHMI PanelsGPS DevicesMP3 PlayersDigital CamerasAll other trademarks are the property of their respective ownersOperating Power-Supply Voltage Range of 1.65-Vto 3.6-V±15-kV Human Body Model High Voltage ESD(GPIO lines)Supports 80 Buttons With Use of 18 GPIOsSupports QWERTY Keypad Operation Plus GPIOExpansionLow Standby (Idle) Current Consumption: 3 µASupports 1-MHz Fast Mode Plus I2C Bus10-Byte FIFO to Store 10 Key Presses andReleasesOpen-Drain Active-Low Interrupt OutputIntegrated Debounce Time of 50 µsSchmitt-Trigger Action Allows Slow InputTransition and Better Switching Noise Immunity atthe SCL and SDA Inputs: Typical Vhysat 1.8 V is0.18 VLatch-Up Performance Exceeds 200 mA PerJESD 78, Class IIVery Small PackageWCSP(YFP): 2 mm × 2 mm; 0.4 mm pitchAPPLICATIONSSmart PhonesTabletsHMI PanelsGPS DevicesMP3 PlayersDigital CamerasAll other trademarks are the property of their respective owners
Description
AI
The TCA8418E is a keypad scan device with integrated ESD protection. It can operate from 1.65 V to 3.6 V and has 18 general purpose inputs/outputs (GPIO) that can be used to support up to 80 keys via the I2C interface.
The TCA8418E saves power and bandwidths since it handles the keypad scanning algorithms. The TCA8418E is also ideal for usage with processors that have limited GPIOs.
The key controller debounces inputs and maintains a 10 byte FIFO of key-press and release events which can store up to 10 keys with overflow wrap capability. An interrupt (INT) output can be configured to alert key presses and releases either as they occur, or at maximum rate. ACAD_INTpin is included to indicate the detection of CTRL-ALT-DEL (essentially, 1, 11, 21) key press action.
The TCA8418E is a keypad scan device with integrated ESD protection. It can operate from 1.65 V to 3.6 V and has 18 general purpose inputs/outputs (GPIO) that can be used to support up to 80 keys via the I2C interface.
The TCA8418E saves power and bandwidths since it handles the keypad scanning algorithms. The TCA8418E is also ideal for usage with processors that have limited GPIOs.
The key controller debounces inputs and maintains a 10 byte FIFO of key-press and release events which can store up to 10 keys with overflow wrap capability. An interrupt (INT) output can be configured to alert key presses and releases either as they occur, or at maximum rate. ACAD_INTpin is included to indicate the detection of CTRL-ALT-DEL (essentially, 1, 11, 21) key press action.
