PT8A3230 Datasheet, PDF (3/7 Pages) Pericom Semiconductor Corporation – Heating Controller

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Block Diagram
NTC1
2bit ADC
PT8A3230/1/2/3/4/5/6/7
Heating Controller
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OFF (LED)
NTC2
Controller
GATE
CLK
ON (ON/OFF)
Function Description
State description
Reset: The device will be at reset state after power-on.
Heating-on: The device will be at heating-on state after heating-on button is pressed.
Heating-off: This device enters heating-off state after its power-on reset or heating timer timeout or heating-off button pressed.
Timer
Once the device enters Heating-on state, internal timer start counting. It reaches timeout state and exit heating-on state after
216000 clock period, that is, the heating time is about 1 hour for 60Hz CLK signal, and 1.2 hour for 50Hz.
Control signal output
When working in Heating-on state, GATE/LED output will be related to NTC input and CLK input amplitude.
Effect of NTC and CLK input voltage on GATE and LED indication
Working Power line
state
voltage
NTC
(NTC open
detection)
NTC
(normal temp
detection)
GATE
（Trigger of
SCR）
0 ~ V_NTC0
25%
240V
V _NTC0 ~ V _NTC1
V _NTC1 ~ V _NTC2
ON
NTC<10M(O
V _NTC2 ~ V_DD
hm)
0 ~ V_NTC0
120V
V _NTC0 ~ V _NTC1
V _NTC1 ~ V _NTC2
V _NTC2 ~ V_DD
OFF
X*
X
X
X
NTC>20M(O
hm)
X
*Note：1）X means any input.
2）Flash1 frequency if 1/32 CLK.
3）Flash2 frequency is 1/8 CLK.
4）LED2(Pin 7)is always in reverse with LED1.
12.5%
0
100%
50%
0
0
0
LED （Pin 5）
PT8A3230/2/4/6
V_NTC up V_NTC down
Flash1*
Flash1
PT8A3231/3/
5/7
On
Flash1
Flash1
On
On
On
On
On
Flash1
Flash1
On
Flash1
Flash1
On
On
On
On
On
Off
Off
Off
Flash2*
Off
Off
12-07-0006
PT0211-6
07/06/2012
3