TI LM8333FLQ8X/NOPB

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 specialfunction 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 generalpurpose 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.

• 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
• 8 Special Function Keys (SF keys) with Wake-Up Capability by Forcing a WAKE_INx Pin to Ground. Pressing a SF Key Overrides any other Key in the Same Row.
• A Total of 72 Keys can be Scanned.
• ACCESS.Bus (I²C-compatible) Interface for Communication with the Host.
• The Watchdog Timer is Mandatory, so WD_OUT Must be Connected to RESET.
• One Host-Programmable PWM Output which also may be Used as a General-Purpose Output.
• Four Host-Programmable General-Purpose I/O Pins, GEN_IO_0, GEN_IO_1, GEN_IO_2, and GEN_IO_3. GEN_IO_0 and GEN_IO_1 can also be Configured for “Slow” Interrupts, in which any Transition will Trigger a Hardware Interrupt Event to the Host.
• The fully static architecture of the LM8333 allows stopping the internal RC clock in Halt mode, which reduces power consumption to the minimum level.

• Mobile Phones
• Personal Digital Assistants (PDAs)
• Smart Handheld Devices
• Personal Media Players