PT2240B Encoder IC. has. High noise immunity. data codes into application. 4 Data pins. Car/Garage BLOCK
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1 Encoder IC DESCRIPTION PT2240B is encoder utilizing CMOS Technology specially designed for remote control applications. It has 2 20 Address. It can support up to 4 Data Bits and is housed in 8 pin SOP package. It encodes address and data codes into a coded waveform suitable for RF modulation. The pin assignments and application circuit are optimized for easy PCB Layout and cost saving advantage. Furthermore, PT2240B s intrinsic feature of being able to support 4 data bits considerably reduces inventory pressures. APPLICATIONS Burglar alarm system Car security system Car/Garage door controller Home/Office security system Personal alarm system FEATURES CMOS technology Low power consumption Least external components High noise immunity Single resistor oscillator Operating voltage: 1.8~15V 4 Data pins 2 20 address codes Available in SOP package Reduction of inventory pressures BLOCK DIAGRAM Tel: Fax: F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan
2 APPLICATION CIRCUIT 8 PINS POWER FAILURE CIRCUIT Warning: Be cautious to use this circuit which will cause the IC shutdown or even damaged. V1.3 2 June, 2011
3 ORDERR INFORMATION Valid Part Number Package Type PT2240B-S 8 Pins, SOP, 150mil Top Code PT2240B-S PIN CONFIGURATION PIN DESCRIPTION Pin Name VDD VSS DOUT D0, D1, D2, D3 OSC I/O - - O I I Description Positive power supply Negative power supply Data output pin Normal= Low Data pin Oscillator pin Pin No , 6, 5, 4 8 V1.3 3 June, 2011
4 FUNCTION DESCRIPTION PT2240B encodes the address code and data set at D0 ~ D3 and A0 ~ A19 into a special waveform and outputs it to the DOUT. This waveform is fed to the RF modulator for transmission. CODE BITS A Code Bit is the basic component of the encoded waveform, and can be classified as either an (Address/Data) Bit or a SYNC (Synchronous) Bit. ADDRESS/ /DATA BIT WAVEFORM PT2240B An Address/Data Bit can be designated as either Bit 0 or 1 if it is in High or Low State respectively. One bit waveform consists of one pulse cycle and each pulse cycle has 128 oscillating time periods. For further details, please refer to the diagram below: where the oscillating time period, α=1/f and (f is the oscillation frequency) As you can see in the diagram above, Bit 0 consist of a High Pulse for 32α (where α=oscillating time period) then changes to LOW Pulse for 96α. Likewise, for Bit 1, the High Pulse for 96α is followed by Low Pulse for 32α. SYNCHRONOUS (SYNC.) BIT WAVEFORM The Synchronous Bit Waveform is 8 bits long with 1/32 bit width pulse. Please refer to the diagram below: V1.3 4 June, 2011
5 CODE WORD PT2240B A group of Code Bits is called a Code Word. A Code Word consists of 20 Address/4 Data Bits followed by one Sync Bit. Please refer to the diagram below: A0 A1 A2 A3 A16 A17 A18 A19 D3 D2 D1 D0 Sync. bit SINGLE RESISTOR OSCILLATOR The built-in oscillator circuit of PT2240B allows a precision oscillator to be constructed by connecting an external resistor (Rosc) to the OSC Pin. The typical oscillator frequency with various resistor values for PT2240B is given below: V1.3 5 June, 2011
6 ABSOLUTE MAXIMUM RATINGS Parameter Symbol Condition Rating Unit Operating voltage VDD -0.3 ~ 15 V Input voltage VIN VDD=12V All outputs not connected VSS-0.3 ~ VDD+0.3 V Operating temperature Topr VDD=12V -40 ~ +85 Storage temperature Tstg -65 ~ +150 DC ELECTRICAL CHARACTERISTICS (Unless otherwise specified, Ta=25, VDD=12V) Parameter Symbol Condition Min. Typ. Max. Unit Operating voltage VDD V Stand-by current ISB OSC connected to Low other pins floating μa Operating current IOP Connect one data pin to high -* - 5 ma VDD=12V, VOH=5V DOUT output current IOH VDD=9V, VOH=4.5V ma VDD=3V, VOH=1.5V V1.3 6 June, 2011
7 PACKAGE INFORMATION 8 PINS, SOP, 150MIL Notes: 1. Refer to JEDEC MS-012AA 2. All dimensions are in millimeter Symbol Millimeter Min. Nom. Max. A A A b c D E E e 1.27BSC L L1 1.04REF θ 0-8 V1.3 7 June, 2011
8 IMPORTANT NOTICE Princeton Technology Corporation (PTC) reserves the right to make corrections, modifications, enhancements, improvements, and other changes to its products and to discontinue any product without notice at any time. PTC cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a PTC product. No circuit patent licenses are implied. Princeton Technology Corp. 2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan Tel: Fax: V1.3 8 June, 2011
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