Features • 8 × 8 standard keys • 8 special function keys (SF keys) providing a total of 72 keys for the maximum keyboard matrix • ACCESS.bus (I 2C-compatible) communication interface to the host • Four general purpose host programmable I/O pins with two optional (slow) external Interrupts • 16 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 Description 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 Leadless Leadframe package (LLP) and a 49-pin MICRO-ARRAY . Both are chip-scale packages. Applications • Mobile phones • Personal Digital Assistants (PDAs) • Smart handheld devices • Personal media players

Also Recommended LM8322▲ 1.8 V Operation, Up To 104 Keys, Up To 16 GPIO, 3 PWM MY BRIEFCASE                                       Click any "Briefcase" icon to add an item

Typical Application *click for larger image	Block Diagram *click for larger image

Datasheet

Title		Size	Date	Other Language
	LM8333 Mobile I/O Companion Supporting Key-Scan, I/O Expansion, PWM, and ACCESS.bus Host Interface	626 Kbytes	21-Aug-07

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Design Tools

Title	Size	Date
Evaluation Kit for LM8333 Device

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM8333FLQ8X	CMOS8T	0	16710	0	0	1780000	2	505079860
LM8333FLQ8Y	CMOS8T	0	16710	0	0	1780000	2	505079860
LM8333GGR8	CMOS8T	0	16710	0	0	1780000	2	505079860
LM8333GGR8X	CMOS8T	0	16710	0	0	1780000	2	505079860

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

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