MC44107 Datasheet, PDF (4/8 Pages) Motorola, Inc – IR Remote Control Transmitter

SST
COM
COM
COM
g
h
COM
SST
i
COMMAND TIMING
S = 1 A(0) B(1) C(1) D(1) E(0) F(0) G(1) H(1) I(1)
d
d
d
f
e
e
MESSAGE TIMING
a
b
c
d
MODULATION OF BURST
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{CIRCUIT TIMING*}
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _Modulation
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{Message Timing}
a = 4/fosc
b = 16/fosc
c = 4/fosc
d = 256/fosc
d = 256/fosc
e = 512/fosc
f = 1536/fosc
8 µs
32 µs
8 µs
512 µs
512 µs
1.02 ms
3.072 ms
1/f Carrier
Half–Bit Time
Half–Bit Time
Bit Time
Pre–Pulse Time
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Command Timing
g = 32 x Bit Time
h = 128 x Bit Time
i = 128 x Bit Time
tkey = 64 x Bit Time
32.8 ms
131 ms
131 ms
65.6 ms
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ^{* Times indicated are typical and refer to an oscillator frequency of 500 kHz.}
Figure 2. MC44107 Remote Control Transmitter Timing Diagram
MC44107
4
MOTOROLA