LM8333
- 8 × 8 Standard Keys
- 8 Special Function Keys (SF Keys) Providing a Total of 72 Keys for the Maximum Keyboard Matrix
- ACCESS.Bus (I2C-compatible) Communication Interface to the Host
- Four General Purpose Host Programmable I/O Pins with Two Optional (Slow) External Interrupts
- 15-byte FIFO Buffer to Store Key Pressed and Key Released Events
- Error Control with Error Reports on (FIFO Overrun, Keypad Overrun, Invalid Command)
- Host Programmable PWM
- Host Programmable Active Time and Debounce Time
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The LM8333 Mobile I/O Companion offloads the burden of keyboard scanning from the host, while providing extremely low power consumption in both operational and standby modes. It supports keypad matrices up to 8 × 8 in size (plus another 8 special-function keys), for portable applications such as cellphones, PDAs, games, and other handheld applications.
Key press and release events are encoded into a byte format and loaded into a FIFO buffer for retrieval by the host processor. An interrupt output (IRQ) is used to signal events such as keypad activity, a state change on either of two interrupt-capable general-purpose I/O pins, or an error condition. Interrupt and error codes are available to the host by reading dedicated registers.
Four general-purpose I/O pins are available, two of which have interrupt capability. A pulse-width modulated output based on a host-programmable internal timer is also available, which can be used as a general-purpose output if the PWM function is not required.
To minimize power, the LM8333 automatically enters a low-power standby mode when there is no keypad, I/O, or host activity.
The device is packaged in a 32–pin WQFN and a
49-pin csBGA. Both are chip-scale packages.
技術資料
| 上位の文書 | タイプ | タイトル | フォーマットオプション | 最新の英語版をダウンロード | 日付 | |
|---|---|---|---|---|---|---|
| * | データシート | Mobile I/O Companion Sup Key-Scan, I/O Expansion, PWM & ACCESS.bus Host I/F データシート (Rev. K) | 2013/05/03 | |||
| アプリケーション・ノート | Understanding Transient Drive Strength vs. DC Drive Strength in Level-Shifters (Rev. A) | PDF | HTML | 2024/07/03 | |||
| アプリケーション・ノート | Understanding the I2C Bus | PDF | HTML | 2015/06/30 | |||
| アプリケーション・ノート | Maximum Clock Frequency of I2C Bus Using Repeaters | 2015/05/15 | ||||
| アプリケーション・ノート | I2C Bus Pull-Up Resistor Calculation | PDF | HTML | 2015/02/13 |
設計と開発
その他のアイテムや必要なリソースを参照するには、以下のタイトルをクリックして詳細ページをご覧ください。
| パッケージ | ピン数 | CAD シンボル、フットプリント、および 3D モデル |
|---|---|---|
| CS-BGA (NYC) | 49 | Ultra Librarian |
| WQFN (NJE) | 32 | Ultra Librarian |
購入と品質
推奨製品には、この TI 製品に関連するパラメータ、評価基板、またはリファレンス デザインが存在する可能性があります。