Remote Control Receiver IC
2. Combination of PT2248/PT2250A Series Code Bits
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PT2249A_PT2250A
a) PT2250A Series Code Bit C3 is internally pulled high and thereby set at a default value of “1”. Thus,
PT2248 Code Bit C3 must be set at “1”.
b) PT2250A Series Code Bits C2 and C3 may be programmed as follows:
1) “0”, “0” (This combination is not available with TC9150.)
2) “0”, “1”
3) “1”, “0”
4) “1”, “1”
c) To set Code Bit to “1” on PT2248, diodes must be connected to Code Terminal from the T1 ~ T3
terminals.
d) To set Code Bit to “0” on PT2248, the terminals must be kept floating.
e) The Code Bits Combinations of PT2248 and PT2250A Series are shown below:
PT2248
C1 C2 C3
001
011
101
111
PT2250A Series
C1
C2
0
0
0
1
1
0
1
1
f) Example: (Refer to Example 2 diagram)
The following example shows the case when PT2248 Code Bits C1=0, C2=0, and C3=1. The CODE1
and CODE2 pins of the PT2250A Series are connected to the VSS (C1=0 and C2=0). In this way, the
PT2250A or any of its series matches the C1 and C2 Code Bits of PT2248; thus, the remote commands
are correctly decoded.
Example 2
Circuit Diagram when Code Bit C1=0 and C2=0
PT2249A_PT2250A V2.6
- 15 -
May, 2007