TMD4903 datasheet(71/86 Pages) OSRAM

71 / 86 page

Page 70

Datasheet, Public

Document Feedback

[v2-00] 2022-Nov-03

TMD4903 − Application Information

Electrical and Optical Output

The electrical or optical output of the remote control engine

can be realized in three ways: use of the integrated top-facing

LED, use of the LDR pin to directly drive an external LED, or use

of the GPIO pin to drive an external FET and IR LED.

The LDR pin has a regulated current sink with selectable drive

value. This is an attractive way to use an external LED without

having an additional LED drive FET. If this method is to be used,

then LEDA must be disconnected from the circuit. Since the

cathode of the integrated LED is connected to the LDR pin

internal to the module any current that is sourced through LEDA

will reduce the current available on the external remote control

LED. When the remote control functionality is not used the

external LED must be electrically disconnected from the LDR

pin to prevent it from illuminating.

Figure 81:

External IR LED Using the LDR Pin

Recommended Connection: Option number one.

If the LDR pin is not used as the pattern output, the GPIO pin

can be used. With this method both the LEDA and external

remote control IR LED may remain connected to the LED power

supply, but an additional FET is needed to drive the remote

control LED.

TMD4903

VDD

GND

LEDA

INT

SCL

SDA

LDR

1µF

1µF >4.7µF

22Ω

µP

VDD

VBUS

Remote Control Circuit Option #1

GPIO

VDD

VLED

µP

VLED

TMD4903 데이터시트(PDF) 71 Page - OSRAM GmbH

TMD4903 데이터시트(HTML) 71 Page - OSRAM GmbH

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86

데이터시트 다운로드

링크 URL