GP2W2001YK Datasheet, PDF (10/12 Pages) Sharp Electrionic Components – IrDA Control Infrared Transceiver for Peripheral Type 1

ELECTRONIC COMPONENTS
SHARP IrDA Control Infrared Transceiver
10. RESET Function
The “RESET” terminal is used to recover the receiver sensitivity to its maximum level. Since Sharp IrDA Control
Infrared Transceiver has a built-in capability to adjust the receiving sensitivity, as a result, a very weak IR signals may
not be correctly received just after receiving a very strong IR signals.
Following figure shows an example of “RESET” signal in order to recover the Sharp IrDA Control Infrared
Transceiver’s receiving sensitivity to its receiving sensitivity to its maximum level:
Optical
Signal
Vo
AGCN
Gap Time
RESET
input
> 13µsec
tret
tret: The time period until AGCN
(NOTES)
This pinout is an Active Low terminal, and stays HIGH level when it is OPEN. The Low Level Pulse for the period of
> 13µsec enables this function to work. This > 13µsec input must be pulsed within the period of Gap time in order for
the transceiver to have receiver sensitivity recovery. The timing for this “RESET” pulse should be adjusted at
controller side.
11. The Derating Curve of Peak Forward LED Current
600
500
400
300
200
100
0
-25
-10 0
25
50
70 75
Ambient Temperature : Ta (^oC)
Figure 11.1 Derating Curve of Peak LED Current
(Pulse width < 3.3µsec, Duty Ratio < 25%)
100
SHARP Electronic Components
10
Rev. 1.1.1 November 26, ‘98