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Fax: 886-2-29174598
URL: http://www.princeton.com.tw
Remote Control Decoder IC
PT2270
OPERATION FLOWCHART
DECODER WITHOUT DATA OUTPUT PIN
1. When Power is turned on, PT2270 activates the Stand-By Mode.
2. It then searches for signals. If there is no signal received, it remains in the Stand-By Mode;
otherwise, the address bits received are compared with the address configuration of the pins.
3. The VT goes high signifying the validation of transmission only when there are two (2) continuous
frames that contain matched address bits; otherwise, VT will not be activated and the Stand-By
Mode remains active.
4. Then, the Address Bits are again checked. Two continuous mismatches of the address bits would
disable the VT and make the Stand-By Mode active; otherwise, the address bits are continuously
checked.
Power ON
Stand-by Mode
No
Signal In?
Yes
Address
Bits Match?
Yes
Address
Bits Match?
Yes
Activate VT
No
No
Disable VT
Yes
Address
Still Match?
No
Yes
Address
Still Match?
No
PT2270 V1.3
-9-
May, 2006
PTC [ PRINCETON TECHNOLOGY CORP ]
