参数资料
型号: RPM871-E2A
厂商: Rohm Semiconductor
文件页数: 5/8页
文件大小: 69K
描述: MODULE IRDA 115.2KBPS 8SMD
标准包装: 1
其它名称: RPM871-E2ADKR
RPM871 
 
Photo Link Module
 
 
Rev.B
5/7 
 
Timing chart
less than 45祍
(emitting)
more than 45祍
approximately 45祍
less than 2.3祍
more than 2.3祍
approximately 2.3祍
approximately 2.3祍
pull up to VCC at approximately 300k&
(emitting)
(emitting)
(Emitting side)
(Detecting side)
TXD
 (7pin)
Internal LED
 (Light output)
Light input
RXD
 (6pin)
PWDOWN
 (5pin)
 
 
 
Attached components 
Recommended values
Part symbol
C1
Recommended value
Notice
1礔, tantalum or ceramic
Ex.) TCFGA1A105M8R (ROHM)
Bigger capacitance is recommended with much noise from power supply
R1
7.5&?%, 1/4W
(VLEDVCC=2.8V)
More than 60cm distance, more than 4[礧/cm
2
] at detecting side.
(vs ver1.0)
More than 46cm distance, more than 6.8[礧/cm
2
] at detecting side.
(vs RPM871)
 
 
In case of using R1 with different condition from the above, formula is as follows :
LED resistance value : R1[&], LED average consumption current : ILED[mA], Supply voltage : VLEDVCC[V],
Link distance : d[cm] (Including LEDs distribution within ?5deg)
 
R1=T ?(VLEDVCC1.45) / d
2
3.5 [&]
ILED=Duty ?(VLEDVCC1.36) / (R1+2.5) [A]
 
Duty : LED duty at emitting
T : 17300 (vs. RPM871), 29400 (vs. ver1.0)
 
 Please set up to be ILED / Duty < 200[mA] (Duty < 20%)
 
 
 
 
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