LM8333 Texas instruments

LM8333

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LM8333

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Описание

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 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

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Number of I/Os	4
Features	(x1) PWM, 72-input keypad scan, Reset pin
Supply voltage (min) (V)	2.25
Supply voltage (max) (V)	2.9
Addresses	1
Rating	Catalog
Frequency (max) (MHz)	0.4
Operating temperature range (°C)	-40 to 85