PT2240B Encoder IC DESCRIPTION PT2240B is encoder utilizing CMOS Technology specially designed for remote control applications. It has 220 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. FEATURES • • • • • • • • • • CMOS technology Low power consumption Least external components High noise immunity Single resistor oscillator Operating voltage: 1.8~15V 4 Data pins 220 address codes Available in SOP package Reduction of inventory pressures APPLICATIONS • • • • • Burglar alarm system Car security system Car/Garage door controller Home/Office security system Personal alarm system BLOCK DIAGRAM Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan PT2240B APPLICATION CIRCUIT 8 PINS POWER FAILURE CIRCUIT Warning: Be cautious to use this circuit which will cause the IC shutdown or even damaged. V1.2 2 September, 2009 PT2240B ORDER INFORMATION Valid Part Number PT2240B-S Package Type 8 Pins, SOP, 150mil Top Code PT2240B-S PIN CONFIGURATION PIN DESCRIPTION V1.2 Pin Name VDD VSS I/O - DOUT O D0, D1, D2, D3 OSC I I Description Positive power supply Negative power supply Data output pin Normal=”Low” Data pin Oscillator pin 3 Pin No. 1 2 3 7, 6, 5, 4 8 September, 2009 PT2240B 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 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: V1.2 4 September, 2009 PT2240B CODE WORD 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 Frequency (KHz) 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: 600 500 400 300 200 100 0 430K 470K 1M 1.2M 1.5M 2M 15 14 13 12 11 10 9 8 7 Vcc V1.2 6 5 4 3 2.5 2 1.8 2.2M (V) 5 September, 2009 PT2240B ABSOLUTE MAXIMUM RATINGS Parameter Operating voltage Symbol VDD Input voltage VIN Operating temperature Storage temperature Topr Tstg Condition VDD=12V All outputs not connected VDD=12V Rating -0.3 ~ 15 Unit V VSS-0.3 ~ VDD+0.3 V -40 ~ +85 -65 ~ +150 ℃ ℃ DC ELECTRICAL CHARACTERISTICS (Unless otherwise specified, Ta=25℃, VDD=12V) Parameter Symbol Condition Operating voltage VDD OSC connected to “Low” Stand-by current ISB other pins floating Operating current IOP Connect one data pin to “high” VDD=12V, VOH=5V DOUT output current IOH VDD=9V, VOH=4.5V VDD=3V, VOH=1.5V V1.2 6 Min. 1.8 Typ. 12 Max. 15 Unit V - - 1 µA -* 30 12 1.2 25 15 1.4 5 - mA mA September, 2009 PT2240B PACKAGE INFORMATION 8 PINS, SOP, 150MIL Symbol Notes: 1. Refer to JEDEC MS-012AA 2. All dimensions are in millimeter V1.2 A A1 A2 b c D E E1 e L L1 θ Millimeter Nom. 1.60 0.15 1.40 4.90 6.00 3.90 1.27BSC 0.60 1.04REF - Min. 1.35 0.10 1.25 0.33 0.17 4.80 5.80 3.80 0.40 0° 7 Max. 1.75 0.25 1.65 0.51 0.25 5.00 6.20 4.00 1.27 8° September, 2009 PT2240B 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: 886-2-66296288 Fax: 886-2-29174598 http://www.princeton.com.tw V1.2 8 September, 2009