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2015-07-0002

PT0326-2

09/29/15

5

PT8A3263-66A-F/67A/68A

NTC Heating Controller with Multi LEDs

Functional Description



Input Button

For PT8A3263/64/65/66

1)

Up button: Temperature up adjustment. Push it once the

temperature setting will increase one level until the

highest level is reached.

2)

Down button: Temperature down adjustment. Push

Down button once, the temperature setting will reduce

one level until the lowest level is reached.

3)

On/Off button: This button is toggled on Heating-on

state and Heating-off state.

For 1-key mode, this key will be set the temperature by loop:

Off12345(6)Off

When power on IC first, the initial temperature setting is

Level 4 (Internal option: Level1)

Delay function:

Heating-on & Heating-off has no delay

(Internal option: Heating-on has 0.5 second delay & Heating-

off has 1 second delay).

4)

C1: When in ON state, C1 output high.

For PT8A3267A/68A

1)

Up button: Temperature up adjustment. Push Up button

once, the temperature setting will increase one level until

the highest level is reached.

2)

Down button: Temperature down adjustment. Push

Down button once, the temperature setting will reduce

one level until the lowest level is reached.

3)

On/Off button: This button is toggled on Heating-on

state and Heating-off state.

PA8A3267A: When power on IC first, the initial temperature

setting is Level 4

PA8A3268A: When power on IC first, the initial temperature

setting is Level 6

If power is always on IC, the last setting temperature level will

be memorized when push ON again

Delay function:

PT8A3267A: Heating-on has no delay & Heating-off has 1

second delay

PT8A3268A: Heating-on has no delay & Heating-off has 2

second delay

4)

C1: Lock key function



When in Heating-on state, after continuously push

on/off key down twice( The interval is less than 600ms ),

IC will lock current temperature level state and disable

up/down and on/off function, C1 pin output high level



When in lock state push on/off key down twice again,

IC will unlock current temperature level state and enable

up/down and on/off function, C1 pin output low level



LEDs indicator:

LED1: Level 1 temperature setting ( eg. 100℃)

LED2: Level 2 temperature setting ( eg. 120℃)

LED3: Level 3 temperature setting ( eg. 140℃)

LED4: Level 4 temperature setting ( eg. 160℃)

LED5: Level 5 temperature setting ( eg. 180℃)

LED6: Level 6 temperature setting ( eg. 200℃, for

PT8A3265/6x, PT8A3267A/68A)

1)

Mode 1

Standby/Off state: LED1 ~ LED6 are all off

On State: The LED that be setting level is on.

2)

Mode 2

Standby/Off state: LED1 ~ LED6 are all off

On state:

Heating up: The LED that be setting level is Flash. (Fclk/32)

Stable: This LED is on

Drop: This LED is on

3)

Mode 3

Standby/Off state: LED1 ~ LED6 are all off

On state: The LED that be setting level and below the

setting level are on.

4)

Mode 4

Standby/Off state: LED1 ~ LED6 are all off

On state:

Level 1:

Heating up/ Drop: LED1 is flash (Fclk/32)

Stable: LED1 is on

Level2:

Heating up/ Drop: LED1 and LED2 is round flash (Fclk/16)

Stable: LED1 and LED2 are on

Level4 ~ Leve6:

similar as upon

Note:

1. When in stable state, don’t flash even if detect the below or

over setting temperature(for mode2 and mode4)

2. When push up/down key, the setting LED will be on state

for 1.5s before starting flashing(for mode2 and mode4)

3. When push up/down key, the setting LED will be forced to

flash for 2.5s (for mode4)

5)

NTC open state

The LED that relate with the setting temperature is fast

flash (Fclk/8)

Disable up/down key function

If detect NTC is not open, recover working state

6)

LED drive style

LED1-LED6: High pulse drive (50Hz)

C1: High level drive, PT8A3267/68A use pulse drive (50Hz)



Reset

After power on, the chip will be reset by internal POR

circuit, GATE, LED and C1 pins output low level and IC is

in Standby state



Timer



Once IC enters Heating-on state, internal timer will

start to count. It’ll be timeout and auto heating-off after

exact 1 hour both under 60Hz and 50Hz. This function

can be disabled by Pin TM is tied to ground.



The timer will be clear while push up/down key.



Control signal output

When working in Heating-on state, Gate output will be

related to NTC1 input and CLK input amplitude.