IRM7001 Vishay, IRM7001 Datasheet - Page 8

• Manufacturer Part Number: IRM7001
• Description: Sir Modulator/demodulator
• Manufacturer: Vishay

Figure 10. Monoshot Operation
Fig 7 illustrates the operation of the monoshot when the internal
clock is set to divide by 2 mode, i.e. when A2=0, A1=0 and
A0=0. A rising edge on the internal modulation state machine
(here called IRTXD OUTPUT), will cause the output on the
IRTXD to go up for 6 crystal clock cycles. With a 3.6864MHz
Figure 11. IRM5000/7001 Schematic with External Clock
Document Number: 82576
Revision 17-August-01
UART
16550
5V Power
Supply
CRYSTAL CLK
(MONOSHOT)
BAUDOUT
INTERNAL
(DIVBY2)
OUTPUT
INT CLK
IRTXD
IRTXD
SOUT
TXD
SIN
1 2 3 4 5 6 7 8
5.2
1 - LED Anode
2 - V cc
3–Tx
4–Tx
12–GND
9 10
11
12 13 14 15 16
0.1µF
C3
3
2
7
10K
clock, this corresponds to a pulse of 1.63us. The duration of
this pulse is independent of the code A2, A1, A0 and is always
6 clock cycles of the crystal, corresponding to the monoshot
operation.
R1
TxD
16XCLK
RCV
CLK_SEL
/NRST
IRM7001
17 18 19 20 21 22 23 24 25 26
9
IR_RCV
IR_TxD
GND
6 CRYSTAL CYCLES
V cc
16
C2
22µF
8
11 2
10 3
C1
0.1µF
TxD
RxD
ANODE
IRM5000
LED
SD
1
4
5
GND
V cc
6
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