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3.3v 看门狗与复位电路
也可以采用max706AT，具体可参考
http://wenku.baidu.com/link?url=mYdOGrlJ7ZvjriA7KVS5-tPzKJeQRnbSdmq75MiCVYjicAIDhgGp8PIx5Ms-xaA6nKJtWvitii3ku8k2nQGXV24OXqUhWfEThsZjYcKjZ3K
也可以采用max706AT，具体可参考
http://wenku.baidu.com/link?url=mYdOGrlJ7ZvjriA7KVS5-tPzKJeQRnbSdmq75MiCVYjicAIDhgGp8PIx5Ms-xaA6nKJtWvitii3ku8k2nQGXV24OXqUhWfEThsZjYcKjZ3K