LM8322 Datasheet | National Semiconductor

Description The LM8322 Mobile I/O panion is a dedicated device to unburden a host processor from scanning a matrix-addressed keypad. In addition, the LM8322 provides general-purpose I/O expansion, and PWM outputs useful for dynamic LED brightness modulation. .. It municates with the host through an I2C-patible ACCESS.bus interface. An interrupt output is available for signaling key-press and key-release events. munication frequencies up to 400 k Hz (Fast-mode) bus speed are supported. The LM8322 supports a predefined set of mands. These mands enable a host device to keep control over all functions. - Three host-programmable PWM outputs useful for smooth - - - - - LED brightness modulation. Supports general-purpose I/O expansion on pins not otherwise used for keypad interface. Key-scan event storage in a FIFO buffer for up to 15 events. Key events, errors, and dedicated hardware interrupts request host service by asserting the IRQ output. The correct reception of a mand may be assumed, if no error is reported from the LM8322 after receiving a mand. Wake-up from Halt mode on any matrix key-scan event, any use of the SF keys, or any activity on the ACCESS.bus interface. 2.0 Features Key Features - Supports keypad matrices of up to 8 × 12 keys plus 8 special-function (SF) keys for a total of 104 keys. SF keys pull keypad scan inputs directly to ground, rather than connecting to a keypad scan output. - Supports I2C-patible ACCESS.bus interface in slave mode up to 400 k Hz (Fast-mode). 3.0 Applications - - - - Mobile phones Personal Digital Assistants (PDAs) Smart handheld devices Personal media players 4.0 Block Diagram © 2007 National Semiconductor Corporation .national. 5.0 Ordering Information NSID LM8322JGR8 LM8322JGR8X NOPB = No PB (No Lead) Spec. NOPB NOPB No. of Pins 36 36 Package Type Micro-Array Micro-Array Temperature - 40 to + 85°C - 40 to + 85°C Package Method 1000 pcs Tape & Reel 3500 pcs Tape & Reel 6.0 Pin...