接口-I/O扩展器 Mobile I/O Companion Key-Scan
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.
型号/品牌 | 代替类型 | 替代型号对比 |
---|---|---|
LM8333FLQ8Y/NOPB TI 德州仪器 | 当前型号 | 当前型号 |
PI7C9X752FAEX 美台 | 功能相似 | LM8333FLQ8Y/NOPB和PI7C9X752FAEX的区别 |