根據看門狗電路的原理,設計出簡單適用、性能可靠的1TrL型看門狗電路以及價格低廉、性能可靠的微功耗CMoS型看門狗電路,同時還介紹了常用的uP監視器O型看門狗電路。關鍵詞:看門狗電路;1TrL型;CMoS型Abstract:In accordance with the principle of WDT (Watch Dog Timer 1circuit,design a,IT.L type WTD circuit,it is a dimple an d applicable an d reliable on performanceo Design a CMoS type WTD circuit,it is low prices and mini-power consumption。Also the article describes a common uP type WTD circuit。Key word:WDT circuit;TFL type;CMoS typ e
The PCA9536 is an 8-pin CMoS device that provides 4 bits of General Purpose parallel
Input/Output (GPIO) expansion for I2C-bus/SMBus applications and was developed to
enhance the NXP Semiconductors family of I2C-bus I/O expanders. I/O expanders provide
a simple solution when additional I/O is needed for ACPI power switches, sensors,
push buttons, LEDs, fans, etc.
The PCA9534 is a 16-pin CMoS device that provide 8 bits of General Purpose parallel
Input/Output (GPIO) expansion for I2C-bus/SMBus applications and was developed to
enhance the NXP Semiconductors family of I2C-bus I/O expanders. The improvements
include higher drive capability, 5 V I/O tolerance, lower supply current, individual I/O
configuration, 400 kHz clock frequency, and smaller packaging. I/O expanders provide a
simple solution when additional I/O is needed for ACPI power switches, sensors,
push buttons, LEDs, fans, etc.