PT8A3270 Datasheet, PDF (5/8 Pages) Pericom Semiconductor Corporation – Heating Controller

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PT8A3270/1/2/3/4/5/6/7
Heating Controller
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Functional Description
 State description
 Reset
The device will be of reset state after power-on.
 Heating on
The device will be of heating on state after heating-on button is on
 Heating off
This device enter heating-off state after its power-on reset or heating timer timeout, and all pins will be the same status as after
power-on reset.
 NTC open protection
When NTC is open, NTC1 pin will be pulled low in the period of NTC open detected.
 Timer
Once IC enters Heating-on State, internal timer starts to count. When time is out after 216000 clock period, it will exit heating-on
state. That is, in case of 60Hz CLK signal, the heating time is about 1 hour; and 1.2 hour for 50Hz.
In heating-on state, temperature is regulated to the selected temperature by the IC through NTC close control loop.
 Control signal output
When working in Heating-on state, Gate/LED output will be related to NTC1 input and CLK input amplitude.
Effect of NTC and VT_CLK (Level 2) on GATE and LED indication
Workin CLK input
g State voltage
NTC
(NTC open
detection)
NTC
(Normal temp
detection)
GATE
(trigger to
SCR/TRIAC)
LED1
3270/2/4/6
LED
LED2
LED1
3270/2/4/6 3271/3/5/7
0 ~ V_{ADC_BIT15 Proportional}
Flash1*
On
High for
V _{ADC_BIT14} ~
output
On
On
level 2
V _{ADC_BIT1}
(240V)
V _{ADC_BIT1} ~
0
On
On
ON
Low for
V _NTCO~
V_DD
V_DD
0 ~ V_{ADC_BIT15}
V _{ADC_BIT14} ~
Proportional
output
Flash1
On
Invert of
LED1
On
On
level 2
V _{ADC_BIT1}
(120V)
V _{ADC_BIT1} ~
0
On
On
V_DD
Off
X*
X
0
Off
Off
X
X
0~V _NTCO
X
0
Flash2*
*Note: 1) X means any input. 2) Flash1 frequency is 1/32 clock. 3) Flash2 frequency is 1/8 clock
Flash2*
LED2
3271/3/5/7
Off
On
On
Off
On
On
Off
Off
12-07-0006
PT0257-1 07/06/12
5