Lector de teclado I2C/SMBus de 1 MHz, de 24 bits, de 1.65 V a 3.6 V con soporte para interrupción y
TCA8424
- Operating Power-Supply Voltage Range of 1.65V to 3.6V
- Supports FM+ I2C Operation up to 1MHz
- Can Support up to 128 (8x16) Key Scan
- Internal Power-On-Reset
- Open Drain Open Drain Active Low INT Output
- Noise Filter on SCL/SDA and Inputs
- Open Drain Outputs Can Sink up to 12mA Current for LED
- Hardware Coded HID and REPORT Descriptors
- Available With Preprogrammed Keyboard Map
- Software Reset per HID Over I2C Standard
- Internal Pull-up Resistors Make Implementation Easy
With no Need for External Components - HID Over I2C Commands Supported
- RESET
- GET REPORT
- SET REPORT
- SET POWER
- Fixed Length 8-byte INPUT Report can Detect up to 6
Simultaneous Key Presses Excluding Modifiers (CTRL, ALT,
SHIFT) - INPUT Report Generated on Key Press and Release
- Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
- ESD Protection Exceeds JESD 22
- 1000-V Human-Body Model (A114-A)
This 128 key scan device is specifically targeted towards end equipment that runs on Windows 8 operating system. The device is fully compliant with the HID over I2C specification defined (ver 1.0) defined by Microsoft. The HID and report descriptors are hard coded into the device so that they don’t need to be programmed at production. The device also comes with a preprogrammed keyboard map that is compatible with most standard laptop/notebook keyboards. However, the device also available without a pre-programmed keyboard, so that any keyboard map may be written into it at production.
The device generates INPUT reports of standard 8-byte length with the 1st byte being the modifier byte. After the keyboard map is programmed into the device it automatically recognizes the row/column location of the modifier keys based on their usage code. It is capable of detecting and reporting up to six simultaneous key presses plus eight modifiers. It generates an input report on each key press and each key release.
The device also supports LED indicators that are standard on a keyboard. Different variations support 2,4 or 8 LED outputs. Each output has open drain architecture and is capable of sinking up to 12mA of current. The LEDs are controlled by a standard OUTPUT report as described in the HID over I2C standard.
Documentación técnica
Tipo | Título | Fecha | ||
---|---|---|---|---|
* | Data sheet | Low-Voltage 8x16 Keyboard Scanner With HID over I2C Compliant Interface datasheet | 27 mar 2013 | |
Selection guide | I2C Infographic Flyer | 03 dic 2015 | ||
Application note | Understanding the I2C Bus | PDF | HTML | 30 jun 2015 | |
Application note | Maximum Clock Frequency of I2C Bus Using Repeaters | 15 may 2015 | ||
Application note | I2C Bus Pull-Up Resistor Calculation | PDF | HTML | 13 feb 2015 | |
Application note | OTP Creation Guide | 27 mar 2013 | ||
EVM User's guide | TCA8424 Evaluation Module User's Guide | 22 feb 2013 |
Diseño y desarrollo
Para conocer los términos adicionales o los recursos necesarios, haga clic en cualquier título de abajo para ver la página de detalles cuando esté disponible.
TCA8424EVM-038 — TCA8424EVM-038
The TCA8424 EVM showcases the capabilities and benefits of using the TCA8424 in a keyboard scanner application. This EVM is designed to allow the user to program their own OTPs and then test the OTP in a system use case.
SCDC004 — TCA8424 GUI
Productos y hardware compatibles
Productos
E/S de propósito general (GPIO) I2C
Desarrollo de hardware
Placa de evaluación
PSPICE-FOR-TI — PSpice® para herramienta de diseño y simulación de TI
TINA-TI — Programa de simulación analógica basado en SPICE
Paquete | Pasadores | Descargar |
---|---|---|
VQFN (RHA) | 40 | Ver opciones |
Pedidos y calidad
- RoHS
- REACH
- Marcado del dispositivo
- Acabado de plomo/material de la bola
- Clasificación de nivel de sensibilidad a la humedad (MSL) / reflujo máximo
- Estimaciones de tiempo medio entre fallas (MTBF)/fallas en el tiempo (FIT)
- Contenido del material
- Resumen de calificaciones
- Monitoreo continuo de confiabilidad
- Lugar de fabricación
- Lugar de ensamblaje
Soporte y capacitación
Foros de TI E2E™ con asistencia técnica de los ingenieros de TI
El contenido lo proporcionan “tal como está” TI y los colaboradores de la comunidad y no constituye especificaciones de TI. Consulte los términos de uso.
Si tiene preguntas sobre la calidad, el paquete o el pedido de productos de TI, consulte el soporte de TI.