PT8A2511 Toaster Controller

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Lindsey Short
6 years ago
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1 P PT8A2511PE PT8A2511 Features Defrost mode for frozen bread Reheat mode Operating voltage: 3.5~5.5V Few external components DIP-8 and SOIC-8 package Description The PT8A2511 is a CMOS LSI chip designed for toaster. Besides normal heating, it also provides defrost and reheat work modes. It provides low cost solution for toaster. Applications Toaster Pin Configuration DEFROST 1 8 GND 2 7 CX RELAY 3 6 Vcc 4 5 RX Pin Description DIP-8 and SOIC-8 (Top View) Top view Name Pin No. Type Description DEFROST 1 I/O 2 I/O RELAY 3 O RELAY drive output. High active. Vcc 4 - Power supply As input, requires a negative pulse to active "Defrost" function. As output, gives a "Defrost" function indicator As input, requires a negative pulse to active "Reheat" function. As output, gives a "Reheat" function indicator RX 5 O Shorts to VCC once an active negative pulse appears at Reheat 6 I/O Oscillator input/output, oscillator's Frequency of 1024Hz with an external R1,C1 CX 7 O Shorts to GND once an active negative pulse appears at Defrost GND 8 - Power Ground 1

2 Block Diagram V CC DEFROST Controller RX CX Power On Reset system oscillator Frequency divider RELAY 2

3 Maximum Ratings Storage Temperature o C to +125 o C Ambient Temperature with Power Applied... 0 o C to +85 o C Supply Voltage to Ground Potential (Inputs & V CC Only) to +5.5V Supply Voltage to Ground Potential (Outputs & D/O Only) to +5.5V DC Input Voltage to +5.5V DC Output Current...20mA Power Dissipation mW Stresses greater than those listed under MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. Recommended operation conditions Symbol Description Min Type Max Unit T A Operation Temperature C V CC Supply voltage V V IH Input High Voltage 0.8V CC - 0 V V IL Input Low Voltage V CC V Electrical Characteristics (T A = 0 ~ 85ºC, unless otherwise noted) Symbol Description Test Conditions Min Type Max Unit V IL I OH I OL Input High Voltage Output Source Current Output Sink Current PIN: DEFROST, PIN: DEFROST, PIN: DEFROST, I OH Output Source Current PIN: RELAY I OL Output Sink Current PIN: RELAY I IH I IL I CC Input High Leakage Current Input Low Leakage Current Frequency of normal oscillator Power supply Current - - V CC =4.0V V V OH =3.0V V OL =0.5V V OH =2.0V V OL =0.5V V CC =4.0V V IH =3.5V V CC =4.0V V IL =0.5V ma ma ma ma µa µa V CC =4.0V, R1=56kΩ, C1= Hz V CC =4.0V, R1=56kΩ, C1=223, all output floating µa 3

4 Application Circuit VCC CONTROL BOARD R1 D2 HEATER R16 R2 R14 R17 R12 C3 47UF VZ1 3.9V 240 R5 1N4007 C1 220UF/16V R8 SLOT1 SLOT2 R9 R15 R10 DEFROST R11 R DFROST SW1 1 SW2 2 R3 2K 3 VCC 4 R4 TEM NTC PT8A2511P DFROST RELAY VCC R6 250k GND CX RX R C2 C R7 56k D1 1N4148 CANCEL SW3 Q1 L LEVER S1 It's better to make C2 less than 563 and R7 larger than 30k 220V 4

5 Mechanical Information PE (DIP-8) 1) Controlling dimensions in millimeters. 2) Ref: JEDEC MS-001D/BA Symbol Dimensions In Millimeters Min Max A A A B B BSC c D E E e BSC L E

6 WE (SOIC-8) 1) Controlling dimensions in millimeters. 2) Ref: JEDEC MS-012E/AA Symbol Dimensions In Millimeters Min Max A A A b c D E E e 1.27 BSC L θ 0 8 Ordering Information Part No. Package Code Package PT8A2511PE P Lead free 8-pin DIP PT8A2511WE W Lead free and Green 8-pin SOIC E = Pb-free or Pb-free and Green Adding X Suffix= Tape/Reel Pericom Semiconductor Corporation Pericom Technology Incorporation reserves the right to make changes to its products or specifications at any time, without notice, in order to improve design or performance and to supply the best possible product. Pericom Technology does not assume any responsibility for use of any circuitry described other than the circuitry embodied in Pericom Technology product. The company makes no representations that circuitry described herein is free from patent infringement or other rights, of Pericom Technology Incorporation. 6

O FF G ATE C LK PT8A324 4/5/6/7. 1 NTC1 NTC1 I I NTC voltage input, NTC open detection input.

O FF G ATE C LK PT8A324 4/5/6/7. 1 NTC1 NTC1 I I NTC voltage input, NTC open detection input. Features Description Dual Voltage (120V/240V) operations Auto temperature control with NTC NTC open protection Multi mode LED indicator Direct drive SCR Auto Heating off after heating timer timeout Low