pt2262.docx

1、pt22621描述PT2262是和PT2272相匹配的遥控编码器，采用CMOS工艺制造。把数据和地址管脚并行输入的“地址/数据”编码成适用于RF或者IR调制的串行码波形。PT2262有最多可达12位的三态（悬空、接高电平、接低电平）地址管脚，可提供531441（或312）种地址码，由此大大减少了地址码冲突的可能性，提高了抗非法代码扫描的能力。2特征CMOS工艺 低功耗非常高的抗噪声能力 最多12位三态地址引脚最多6位数据引脚 宽范围工作电压：Vcc=415V单电阻振荡器 锁存或瞬时输出型DIP和SOP二种封装3应用汽车安全系统 房门控制器遥控风扇 家用安全系统/自动控制系统遥控玩具 工业用遥控

2、4框图5管脚图6管脚描述管脚名I/O描述管脚编号18脚20脚A0A5I地址管脚的05位PT2262的这六个三态脚决定了编码波形的05位，均可被设置成“0”,“1”or“f”(悬空).1616A6/D5A11/D0I编码的地址脚611/数据脚50。这六个三态输入端的输入状态确定编码波形的第611位，当做为地址端使用时，可被设为0、1或f(浮空)，做为数据端时，他们只能是0或1。781013781215/TEI输出使能。低电平有效。当此引脚为低电平时，PT2262从DOUT引脚输出编码波形。1416OSC1O振荡器引脚1在这两脚之间连接一个电阻，此电阻决定PT2262的基频。1517OSC2I振荡

3、器引脚21618DOUTO数据输出引脚。编码后的波形从此引脚串行输出。当PT2262不传输时，DOUT输出低(Vss)电平。1719Vcc-电源1820Vss-地997功能描述当/TE置0（低电平）时，PT2262将从A0A5和A6/D5A11/D0管脚输入的“地址/数据”转换为专用的波形由DOUT输出。DOUT输出提供给RF调制器或IR转换器，然后用无线电波或红外线将“地址/数据”信息发射出去。发射的无线电波或红外线被RF解调器或IR接收器接收并恢复为原波形。然后PT2272对波形译码。如果地址正确，就将其中的数据由相应管脚输出。至此，完成了一次编解码。7.1 射频（RF）工作方式7.1.1

4、 位码位码是编码波形的基本成分，分为AD(地址/数据)位和SYNC(同步)位两种。7.1.2 地址/数据(AD)位波形一个AD位能被设置为“0”、“1”或“f”，分别对应“低电平”、“高电平”和“悬空”状态，一位波形由2个脉冲周期组成，每个脉冲周期持续时间为16个OSC（主频）周期。参见下图：此处： = 振荡器时钟周期7.1.3 同步(Sync.)位波形同步位波形是宽度为1/8位（4个主频周期）、持续时间为4位（128个主频周期）的正脉冲。参见下图：注意：1AD位=327.1.4 字码一组位码称为字码。一个字码由12个AD位，跟一个同步位组成。12个AD位由对应的A0A5、A6/D5A11/D

5、0管脚的输入决定。当PT2262的A0A5、A6/D5A11/D0管脚中的某些被作为数据使用时，地址位将相应减少。例如：要求有3位数据时，地址就减少到9位，传送格式是：9位地址3位数据同步位PT2262/PT2272最多可有12个地址位，包括6个地址/数据位。下图显示位码和它们对应的管脚：0个数据位A0A1A2A3A4A5A6A7A8A9A10A11Sync.位1个数据位A0A1A2A3A4A5A6A7A8A9A10D0Sync.位2个数据位A0A1A2A3A4A5A6A7A8A9D1D0Sync.位3个数据位A0A1A2A3A4A5A6A7A8D2D1D0Sync.位4个数据位A0A1A2A

6、3A4A5A6A7D3D2D1D0Sync.位5个数据位A0A1A2A3A4A5A6D4D3D2D1D0Sync.位6个数据位A0A1A2A3A4A5D5D4D3D2D1D0Sync.位位码A0A5、A6/D5A11/D0被管脚A0A5、A6/D5A11/D0的输入状态决定。例如，当A0(管脚1)输入为“高电平”时，码位A0为“1”。同样，当A0(管脚1)输入为“低电平”或“浮空”时，码位A0分别为“1”或“f”。7.1.5 代码帧代码帧由四个连续的字码组成。当TE_管脚出现“负脉冲”（/TE脚被拉到低电平）后，DOUT管脚输出代码帧。代码帧传输结束时，如果TE仍为低电平，PT2262接着输出

7、另一个代码帧。It should be noted that the Code Frame is synthesized at the time of transmission.7.1.6 单电阻振荡器PT2262具有内置振荡器电路，只要在OSC1和OSC2管脚之间外接一个电阻，就可构成一个精密的振荡器。为了使PT2272能够对接收的波形正确解码，PT2272振荡器的频率必须是PT2262的2.58倍。PT2262和PT2272典型的振荡器频率与电阻值的关系如下图：编码器震荡频率解码器震荡频率推荐使用的震荡电阻值如下表：PT2262PT22724.7M820K*3.3M680K*1.2M200

8、K*注意:*-表示PT2272的Vcc是5V到15V*-表示PT2272的Vcc是3V到15V也就是说如果PT2272的供电电压低于5V，需要使用低的震荡电阻值来匹配PT2262和PT2272。7.2 红外（IR）工作方式在IR方式工作时，除输出波形有38KHz的载频以外，功能和上述相似。细节如下。7.2.1 位码位码被用来调制38KHz载频，可以是“0”、“1”或“f”。波形如下图所示：注意：=2个时钟周期7.2.2 字码字码由与RF字码相同格式的位码构成。7.2.3 代码帧同样，代码帧由字码构成，格式与RF工作方式一样。7.2.4 振荡器IR工作方式时，载频是振荡器频率的1/2，因载频为3

9、8KHz，故振荡器频率应该为76KHz左右，可在OSC1和OSC2之间使用一个430K560K的振荡器电阻。注意，载波是一个50%占空比的脉冲序列。8 操作流程图9 极限参数参数符号条件范围单位供给电压Vcc-0.316.0V输入电压VI-0.3Vcc+0.3V输出电压VO-0.3Vcc+0.3V最大功耗PaVcc=12V300mW工作温度Topr-40+85存储器温度Tstg-6515010 直流参数参数符号测试条件最小典型最大单位供给电压Vcc415V待机电流ISBVcc=12VOSC2=12VA0A11Open0.11ADOUT输出驱动电流IOHVcc=5VVOH=3V-3mAVcc=8

10、VVOH=4V-6mAVcc=12VVOH=6V-10mADOUT输出陷电流IOLVcc=5V,VOL=3V2mAVcc=8VVOL=4V5mAVcc=12VVOL=6V9mA11 应用电路11.1 UHF频段四位数据发射电路（推荐）11.2 UHF频段仅地址（零数据）发射电路（推荐）11.3 UHF频段仅地址（零位数据）ZERO-STAND-BY发射电路（推荐）11.4 红外6位数据电路，推荐调整震荡电阻得到38KHZ 的载频。12 订货信息订购编号封装Top odePT226218Pins,DIP,300milPT2262PT2262-IR18Pins,DIP,300milPT2262-I

11、RPT2262-S1818Pins,SOP,300milPT2262-S18PT2262S20Pins,SOP,300milPT2262-SPT2262-IRS20Pins,SOP,300milPT2262-IRSPT2262(L)18Pins,DIP,300milPT2262PT2262-IR(L)18Pins,DIP,300milPT2262-IRPT2262-S18(L)18Pins,SOP,300milPT2262-S18PT2262S(L)20Pins,SOP,300milPT2262-SPT2262-IRS(L)20Pins,SOP,300milPT2262-IRS注意:1. (L

12、), (C) or (S) = 无铅2. The Lead Free mark is put in front of the date code.13 封装信息13.1 18 PINS, DIP, 300MIL符号Min.Nom.Max.A-0.210A10.150A20.1150.1300.195b0.0140.0180.022b20.0450.0600.070b30.030.0390.045c0.0080.0100.014c10.0080.0100.011D0.8800.9000.920D10.005-E0.3000.3100.325E10.2400.2500.280e0.100 BAS.

13、eA0.300 BAS.eB-0.430eC0.000-0.600L0.1150.1300.150注意:1. 所有尺寸标注都是以英寸为单位。2. Dimensioning and tolerancing per ANSI Y14.5M-1982.3. Dimension“A”,“A1”and “L” are measured with package seated in JEDEC Seating Plane GaugeGS-3.4. “D”, “D1” and “E1” dimensions do not include mold flash or protrusions. Mold fla

14、sh or protrusions shall not exceed 0.010 inch.5. “E” and “eA” measured with the leads constrained to be perpendicular to datum-c-.6. “eB” and “eC” are measured at the lead tips with the leads unconstrained.7. “N” is the number of terminal position (N=18).8. Pointed or rounded lead tips are preferred

15、 to ease insertion.9. “b2” and “b3” maximum dimensions are not include dambar protrusions. Damber protrusions shall not exceed 0.010 inch (0.25mm).10. Distance between leads including Damber protrusions to be 0.005 inch minimum.11. Datum plane -H- coincident with the bottom of lead, where lead exits

16、 body.12. Refer to JEDEC MS-001, Variation AC.JEDEC is the trademark of JEDEC SOLID STATE TECHNOLOGY ASSOCIATION.13.2 18 PINS, SOP, 300MILSymbolMin.Nom.Max.A2.35-2.65A10.10-0.30B0.33-0.51C0.23-0.32D11.35-11.75E7.40-7.60e1.27 BAS.H10.00-10.65h0.25-0.75L0.40-1.270-8Notes:1. Dimensioning and tolerancin

17、g per ANSI Y14.5-1982.2. Dimension “D” does not include mold flash, protrusions or gate burrs. Mold Flash. protrusion or gate burrs shall not exceed 0.15mm (0.006 in) per side.3. Dimension “E” does not include interlead flash or protrusions. Interlead flash or protrusions shall not exceed 0.25mm (0.

18、010 in) per side.4. The chamfer on the body is optional. It is not present, a visual index feature must be located within the crosshatched area.5. “L” is the length of the terminal for soldering to substrate.6. “N” is the number of terminal positions. (N=18)7. The lead width “B” as measured 0.36mm (

19、0.014 in) or greater above the seating plane, shall not exceed a maximum value of 0.61mm (0.24 in)8. Controlling dimension: MILLIMETER.9. Refer to JEDEC MS-013 Variation AB.JEDEC is the trademark of JEDEC SOLID STATE TECHNOLOGY ASSOCIATION.13.3 20 PINS, SOP, 300 MILSymbolMin.Nom.Max.A2.35-2.65A10.10

20、-0.30B0.33-0.51C0.23-0.32D12.60-13.00E7.40-7.60e-1.27 BSC.-H10.00-10.65h0.25-0.75L0.40-1.270-8Note:1. Dimensioning and tolerancing per ANSI Y14.5M-1982.2. Dimension “D” does not include mold flash, protrusions or gate burrs. Mold Flash, protrusion or gate burrs shall not exceed 0.15 mm (0.006 in) pe

21、r side.3. Dimension “E” does not include interlead flash or protrusions. Interlead flash or protrusions shall not exceed 0.25 mm (0.010 in) per side.4. The chamfer on the body is optional. It is not present, a visual index feature must be located within the crosshatched area.5. “L” is the length of

22、the terminal for soldering to a substrate.6. N is the number of the terminal positions (N=20)7. The lead width “B” as measured 0.36 mm (0.014 in) or greater above the seating plane, shall not exceed a maximum value of 0.61 mm (0.24 in).8. Controlling dimension: MILLIMETER.9. Refer to JEDEC MS-013, Variation AC.JEDEC is the trademark of JEDEC SOLID STATE TECHNOLOGY ASSOCIATION.