- 8 × 8 standard keys
- 8 special function keys (SF keys) provide a maximum matrix of 72 keys for a total of 72 keys
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ACCESS.bus（I 2 C compatible) communication interface with the host
- Four universal host programmable I/O pins with two optional (slow) external interrupts
- 15 bytes of FIFO buffer to store key and key release events
- Error Control Error Reporting (FIFO Overflow, Overflow Keyboard, Invalid Commands)
- Host programmable PWM
- Host programmable activity time and bounce time
illustrate
The LM8333 mobile I/O assistant offloads the burden of scanning the keyboard from the host while providing service and standby modes with very low power consumption. It supports keyboard matrices up to 8 × 8 sizes (plus 8 additional special function keys) for portable applications such as mobile phones, handheld computers, games, and other handheld applications.
Keystroke and release events are encoded into a byte format and become a FIFO buffer retrieved by the host processor to load. Interrupt outputs (IRQs) are used for signals such as keyboard activity, changes in state or status to two interrupt functions, or events for error conditions. Interrupt and error codes are provided to the host by reading the dedicated registers.
Four general-purpose I/O pins are available, two of which have interrupted capability. A programmable internal timer on the host for pulse-width modulation outputs is also available and can be used as a universal output if PWM functionality is not required.
To minimize power, the LM8333 automatically enters low-power standby mode with no keyboard, I/O, or host activity.
The device is available in a 32-pin leadless lead frame package (LLP) and a 49-pin microarray. Whether it's chip-level packaging.
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- mobile phone
- Personal (handheld) digital assistant
- Smart handheld devices
- Personal media player
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