CAT24C021
I2C with Supervisory Features Serial...
Catalyst
CAT24C021PDF下载
CAT24C021J-25TE13
Supervisory Circuits with I2C Serial...
CATALYST [Catalyst Semiconductor]
CAT24C021J-25TE13PDF下载
CAT24C021J-28TE13
Supervisory Circuits with I2C Serial...
CATALYST [Catalyst Semiconductor]
CAT24C021J-28TE13PDF下载
CAT24C021J-30TE13
Supervisory Circuits with I2C Serial...
CATALYST [Catalyst Semiconductor]
CAT24C021J-30TE13PDF下载
CAT24C021J-42TE13
Supervisory Circuits with I2C Serial...
CATALYST [Catalyst Semiconductor]
CAT24C021J-42TE13PDF下载
CAT24C021J-45TE13
Supervisory Circuits with I2C Serial...
CATALYST [Catalyst Semiconductor]
CAT24C021J-45TE13PDF下载
CAT24C021P-25TE13
Supervisory Circuits with I2C Serial...
CATALYST
CAT24C021P-25TE13PDF下载
CAT24C021P-25TE13
Supervisory Circuits with I2C Serial...
CATALYST [Catalyst Semiconductor]
CAT24C021P-25TE13PDF下载
CAT24C021P-28TE13
Supervisory Circuits with I2C Serial...
CATALYST
CAT24C021P-28TE13PDF下载
CAT24C021P-28TE13
Supervisory Circuits with I2C Serial...
CATALYST [Catalyst Semiconductor]
CAT24C021P-28TE13PDF下载
两种设定模式之间来回切换;一个是工作设定键,按此键系统进入工作模式;其他2个键实现加l和减1功能。加1和减l键只有在设定模式下才能工作,在工作模式下,按这2个键系统不响应。系统另有5路开关量输出,p1.3脚用于控制进料电磁阀,p1.4脚用于温度控制,p1.5,p1.6,p1.7脚用于雾气振动开关的控制。 考虑到此单片机没有掉电保护存储器,在掉电和死机的情况下系统的设定值会回零,而且每次开机都要进行设定,比较烦琐。为此系统外扩了1片e2prom存储器,我们选用12c存储器--cat24c021,用于存储系统的设定值。 cat24c021是美国catalyst公司的产品,他是集e2prom存储器、看门狗定时器、复位控制器3种功能为一体。他的应用,一方面提供了掉电保护存储器;另一方面大大增加了系统的可靠性。其内置的看门狗定时器为微处理器提供了独立的保护系统,一旦系统出现故障,在超时之后,复位信号便做出响应。另外其内部的vcc检测电路可使系统免受低电压的影响,当检测到最小工作电压时,系统将复位,直到vcc返回到正常值为止。其存储器部分采用的是256b串行的e2prom