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參數(shù)資料
| 型號： | TMS3637D |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 搖控器 |
| 英文描述： | INFRARED, TRANSMITTER/RECEIVER IC, PDSO8 |
| 封裝： | PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 28/54頁 |
| 文件大?。?/td> | 384K |
| 代理商： | TMS3637D |
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6–3
R2
22 k
OSCR
OSCC
TIME
GND
C1
10 nF
C2
0.1 nF
VCC
IN
CEX
OUT
U1 (transmitter)
R8
22 k
OSCR
OSCC
TIME
GND
C7
1 nF
VCC
IN
CEX
OUT
U2 (receiver)
R6
22 k
R7
1 M
C5
470 nF
C4
680 pF
R5
100 k
R3
220
R4
100 k
R1
10 k
GND
VCC and Code
C6
10 nF
R9
220
D1
VCC
OUT
C3
47
F
+
B
87
6
5
1
234
1
2
3
4
8
765
A
C
D
Figure 6–1. Two-Wire Direct Connection
6.2.2
Four-Wire Direct Connection
Table 6–2 lists the parts for the schematic of a four-wire direct connection of the transmitter/receiver shown
in Figure 6–2. In this example, the VCC, code, clock, and GND are provided through four separate wires.
The transmitter is configured as a normal continuous transmitter and the content of the configuration
EEPROM cells is:
CA
CB
CC
CD
CE
CF
CG
CH
CI
111000000
The transmitter uses its external oscillator to clock the data out. This external oscillator is a simple inverting
(NOT) gate that has a positive feedback loop through a resistor. The frequency of the oscillator is
approximately 26 kHz.
The receiver is configured as a logic normal (1-code) Q-state inverting receiver, and the content of the
EEPROM cells is:
CA
CB
CC
CD
CE
CF
CG
CH
CI
010001001
The receiver is used in the inverting mode. The code is considered to be inverted when using OUT on the
transmitter to transmit the code. The signal path between the transmitter and receiver does not invert the
signal; using the logic mode (CF = 1) also does not invert the signal. The result is a signal that is inverted
at the internal logic controller of the receiver; then use CI = 1, and an inverting receiver is used. (When IN
transmits the code, the signal is not inverted; then use CI = 0. An external pullup is not required when IN
is used in this manner).
As required, the oscillating frequency is approximately 260 kHz, which is a frequency approximately ten
times greater than that of the transmitter. This is provided by the internal oscillator in the receiver. OUT on
the receiver maintains the same status for approximately 0.5 seconds (1M
× 470 nF). A typical application
is an electronic key as shown in Figure 6–3.
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