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12-07-0006

PT0259-3

07/06/12

3

PT8A3514/15/16/17/18/19(A/B)

Smart Iron Controller

The chip is comprised of several blocks: on-chip shunt regulator, sensor signal processor, build-in system oscillator,

30s/8min/10min/15min timer, logic control circuit, and power on reset, etc. Each block will be described as below.

Logic control circuit

Logic control circuit mainly carries out logic control function. It not only collects signals from other blocks, but also generates

various driving signals including RELAY&DISC. Besides, an external LED will flash at about 1Hz and a buzzer will make a

sound with a frequency of 4KHz every 0.5s for 6 times or continual after internal timer times out. Signals at RELAY will control

external relay to decide whether IRON heats or not.

Sensor signal processor

The core in the whole system is how to correctly detect the position and movement of sensor so that the system can be always

under safe control. Thus, it is critical to accurately and correctly deal with signal from sensor in different status and eliminate the

noise caused by debounce action from sensor. Here, a unique structure is used to do the high-requirement signal processing.

In real application of IRON, sensor needs to be installed according to certain requirements (for example its inclination).

Timer

Timer block mainly generates various timing signal according to the position of IRON.

It is easy to get accurate timer (30s/8min/10min/15min) by using AC 60Hz/50Hz signal as timing reference. As above description,

Iron in Horizontal position over 30s will stop heating. While Iron in vertical position over 8min/10min/ 15min will also stop

heating.

Buzzer

A buzzer will make 0.5S sound with a frequency of 4 KHz for 6 times or continual after internal timer timeouts.

LED

During heating, LED pin is floating and an external LED will turn on. After times out, LED pin outputs pulse and an external LED

will flash at about 1Hz.