RPM851 データシートの表示（PDF） - ROHM Semiconductor
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RPM851 Datasheet PDF : 7 Pages
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Communication ICs
FOperation notes
(1) LEDVCC (pin5), VCC (pin122) and PINVCC (pin13)
S Other power source can be used within ± 0.2 [V] volt-
age difference between LEDVCC and VCC. VCC and
PINVCC should be supplied from the same source.
(2) Caution in designing board lay-out
S Pin1 is radiaton pin from LED as well. Wider pattern is
better.
S The line of RXDSIR (pin10) should be connected at
backside via through hole close to RPM851A pin lead.
Better not to be close to photo diode side (pin13).
! This is to minimize feedback supplied to photo diode
from RXDSIR.
S Capacitors for pin12 (VCC) and pin13 (PINVCC) should
be placed close to RPM851A.
FExternal dimensions (Units: mm)
RPM851A Series
S Better to be placed more than 1.0cm in radius from
photo diode (pin13) and also away from the parts
which generates noise, such as DC / DC converter.
Digital signal line, such as clock pulse, bus etc, are
also away more than 1.0cm in radius from photo diode.
S As for C1, C2 and, GND should be close to pin7 and
placed close to pins11, 12 and 13 (within 5mm).
(3) Please be sure to set up the TXD (pin6) input to be
“L” (under 0.5 [V]) except transmitting data (for < 90
µ s. ON Duty < 20%).
(4) Powerdown current might increase if exposed by
strong light (ex. direct sunlight) at powerdown mode.
(5) Please use by the signal form which is specified by
IrDA Ver1.0. There might be on error if used by differ-
ent signal form.
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