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PT8A3361 Datasheet, PDF (7/16 Pages) Pericom Semiconductor Corporation – NTC+LCD Heating Controller
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PT8A3361/62/63/64
NTC+LCD Heating Controller
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2 LCD Indicator
Default described:
The display on LCD indicates the temperature settings.
During heating-up, LCD flashes, its frequency is 1.5Hz. When the temperature reaches 27°F -45°F (15°C -25°C) less than the
level of temperature setting, LCD will turn always on.
When adjust from low temperature setting level to high, LCD will flash twice. Its frequency is 1.5Hz.
Class for LCD indicator
Heating-UP level
LCD Number
LCD Signal bar
Flash for 1.5Hz
\
TEMP setting adjust
LCD Number
Up for flash twice
Down to ON
LCD Signal bar
\
TEMP Keep
LCD Number
LCD Signal bar
ON
\
Heating-Down level
LCD Number
LCD Signal bar
ON
\
3 Reset
After power on, the chip will be reset by internal POR circuit, LCD is disabled. GATE and Backlight pins output low level.
4 LCD Backlight
LCD backlight for heating-up or heating down and TEMP setting or TEMP keep, the show follow:
P/N
PT8A3361/2/3/4
BL1
PIN
Key on state
BL2 PIN
\
BL3 PIN
\
Note: Pin BL1 outputs high level under 100% hot up .key on state, and low level under power off state.
Pin BL2 outputs high level under key on state keep 6s.
Pin BL3 outputs high level under keep Temp.
5 Timer
Once IC enters Heating-on state, internal timer will start to count. It’ll be timeout and auto heating-off about 1 hour both
60Hz and 50Hz.
6 Control signal output
When working in Heating-on state, Gate output will be related to NTC1 input and CLK input amplitude.
1) Effect of NTC and VTCLK (Level 2) on GATE
Working
State
CLK input
NTC (NTC
NTC
voltage
open detection) (Normal temp detection)
GATE (trigger to
SCR/TRIAC)
Temperature lower than
100% settings
High for level
Temperature between 90%
2 (220V)
to 100% settings
Temperature is reached
ON
V NTCO~ VDD
settings
Temperature lower than
100% settings
Low for level
Temperature between 90%
2 (110V)
to 100% settings
Temperature is reached
settings
Off
X*
X
25%
12.5%
0
100%
50%
0
0
ON
X
0~V NTCO
X
0
*Note: 1) X means any input.
LCD
Normal
Display off
( flashes, its
frequency is 3Hz)
12-07-0006
PT0356-1 07/06/12
7
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