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Confidential Document
Philips Electronics Singapore Pte Ltd
3.1
General
This remote control is a 2.4GHz RF remote control (RC1974401/01BRF) which will
transmit RF protocol. It will work with 2.4GHz RF USB receiver (OVU700003/01RF).
3.2
Stuck key function
Stuck key means a key or multiple key has been pressed for a very long time in normal
operating mode. ( For multiple key press, refer to section 1.6.4 ) To preserve battery
power, the remote will enter sleep mode at about 30 seconds after the last key transition
to consume minimal power (the Backlight LED and LED indicator will be turned off at
the same time). After all keys are released, the remote resumes normal operation.
Following graphic shows when this power down mode is entered: Power Down means
the MCU and RF module enters into sleep mode.
There is a tolerance of +/- 3 seconds to this timeout
STUCK KEY TIMEOUT
IR Transmit
Keypress
Time
Key Pressed
Code starts transmitting
* Stuck Key Timeout is typical 30 seconds, actual timing depends on the protocol transmitted
3.3
Sleep mode
Sleep mode means both application MCU and RF module enter sleep mode. All
LEDs/Backlight LED is turned off during sleep mode.
Besides remote control can enter sleep mode because of stuck key described in section
3.2,
There are 2 conditions where the remote control will enter sleep mode
Upon batteries insertion, remote control will enter sleep mode if there is no
key press within 4 secs.
Remote Control enters sleep mode 4 seconds after the key is released
In all the 2 cases above, pressing a key again will wakeup the remote control.
30s ± 3s *
Stuck key mode
Key still pressed after 30 ± 3 seconds
Remote goes in stuck key mode,
code transmission stops
Code transmission
Remote resumes
normal operation
activated by valid key
after stuck key situation neutralized
Page 13 of 15
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