TCA8424
24-Bit, 1,65 V bis 3,6 V, 1 MHz, I2C/SMBus-Tastenfeldscanner mit Interrupt- und 128-Tasten-Unterstüt
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.
Technische Dokumentation
Typ | Titel | Datum | ||
---|---|---|---|---|
* | Data sheet | Low-Voltage 8x16 Keyboard Scanner With HID over I2C Compliant Interface datasheet | 27 Mär 2013 | |
Selection guide | I2C Infographic Flyer | 03 Dez 2015 | ||
Application note | Understanding the I2C Bus | PDF | HTML | 30 Jun 2015 | |
Application note | Maximum Clock Frequency of I2C Bus Using Repeaters | 15 Mai 2015 | ||
Application note | I2C Bus Pull-Up Resistor Calculation | PDF | HTML | 13 Feb 2015 | |
Application note | OTP Creation Guide | 27 Mär 2013 | ||
EVM User's guide | TCA8424 Evaluation Module User's Guide | 22 Feb 2013 |
Design und Entwicklung
Weitere Bedingungen oder erforderliche Ressourcen enthält gegebenenfalls die Detailseite, die Sie durch Klicken auf einen der unten stehenden Titel erreichen.
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
Unterstützte Produkte und Hardware
Produkte
I2C Universal-I/OS (GPIOs)
Hardware-Entwicklung
Evaluierungsplatine
PSPICE-FOR-TI — PSpice® für TI Design-und Simulationstool
TINA-TI — SPICE-basiertes analoges Simulationsprogramm
Gehäuse | Pins | Herunterladen |
---|---|---|
VQFN (RHA) | 40 | Optionen anzeigen |
Bestellen & Qualität
- RoHS
- REACH
- Bausteinkennzeichnung
- Blei-Finish/Ball-Material
- MSL-Rating / Spitzenrückfluss
- MTBF-/FIT-Schätzungen
- Materialinhalt
- Qualifikationszusammenfassung
- Kontinuierliches Zuverlässigkeitsmonitoring
- Werksstandort
- Montagestandort
Support und Schulungen
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