µ P 管理芯片控制可编程滤波器

摘要： 一个应用程序显示如何使用微处理器的监督使用程序双条筛选器。使用重置电路和打包带到电源失效比较器延时电路，筛选器可以轻松地进行编程，以在通电使用此过程中提供正确的截止频率的时间延迟重置电路。

Maxim > App Notes > FILTER CIRCUITS (ANALOG)

Keywords: analog filter, microprocessor supervisor, uP supervisor, reset circuit, power fail comparator Jul 09, 1998

APPLICATION NOTE 23
P-Supervisor Chip Controls Programmable Filter

Abstract: An application showing how the use of a microprocessor supervisor can be used to program a dual section filter.
Using the time delay from the reset circuit and strapping it to the power-fail comparator with a delay circuit, the filter can
easily be programmed to provide the correct cutoff frequencies during power up using this reset circuit.


Certain dual-section filter ICs have a common 7-bit port for programming the two cutoff frequencies (fC). If both sections
require the same fC, you can strap an appropriate code to the port pins,