- 8 × 8 standard keys
- 8 special function keys (SF keys) provide a maximum of 72 keys for the maximum matrix keyboard
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ACCESS.bus（I 2 C compatible) communication interface and host
- Four general-purpose host programmable I/O pins with two selectable (slow) external interrupts
- A 15-byte FIFO buffer to store keystrokes and key release events
- Error control error reporting (FIFO overflow, overflow keyboard, invalid command)
- Host programmable PWM
- Host programmable active time and backbounce time
illustrate
The LM8333 Mobile I/O Little Helper offloads the burden of scanning the keyboard from the host while providing extremely low power consumption in both business and standby modes. It supports keyboard matrix up to 8 × 8 sizes (plus 8 additional special function keys) for portable applications such as mobile phones, PDAs, games, and other handheld applications.
The key press and release events are encoded into a byte format and become loaded into a FIFO buffer retrieved by the host processor. The interrupt output (IRQ) is used for signals such as keyboard activity, changes to the general-purpose I/O pins or states of two interrupt functions, or events for error conditions. Interrupts and error codes are provided to the host by reading private registers.
Four general-purpose I/O pins are available, two of which have the ability to interrupt. A programmable internal timer on the host of the pulse-width modulation output is also available and can be used as a general-purpose output if PWM functionality is not required.
To minimize power, the LM8333 automatically enters a low-power standby mode when there is no keyboard, I/O, or host activity.
The device is available in a 32-pin leadless leadframe package (LLP) and a 49-pin microarray. Whether it's a chip-scale package.
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- mobile phone
- Personal (PDA) digital assistant
- Smart handheld devices
- Personal media player
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