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參數資料
| 型號： | TRC1315D |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 搖控器 |
| 英文描述： | RF, REMOTE CONTROL SUPPORT CIRCUIT, PDSO14 |
| 封裝： | PLASTIC, SO-14 |
| 文件頁數： | 6/27頁 |
| 文件大小： | 358K |
| 代理商： | TRC1315D |
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TRC1300, TRC1315
MARCSTAR
I E/D
REMOTE CONTROL ENCODER/DECODERS
SLWS011D – AUGUST 1996 – REVISED JANUARY 1997
14
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
encoder timing
The rate of the transmitted data is variable from 500 Hz to 5 KHz (adjustable using an external resistor and
optional capacitor) so that the time to send the data in one frame (193 bits) varies from 386 ms to 38.6 ms. When
one or any combination of VRC/TX1 – VRC/TX4 terminals is pulled low, the device outputs up to 360 frames
of data and then stops. This is to prevent indefinite code transmission (and battery depletion) when a transmit
button is pressed continuously, and increases the opportunity for the decoder to detect the transmitted code.
The decoder activates a function output on the first valid received code. The data portions of the transmitted
frames are separated by one
dummy pulse and 150 data clock cycles. This gives a lower effective frame duty
cycle, so that the average power output of an interfaced RF oscillator is reduced, and higher peak power can
be used for increased range.
The range of frame duty cycle is dependent on the security and function codes, and can vary as calculated:
D Frame duty cycle = total frame high time / total frame time.
D Total frame time = 48 + 120 + 24 + 1 + 150 = 343 data clock cycles.
D The precode (48 bits) always has a duty cycle of 50%.
D The security code (120 bits) duty cycle can vary from 66% (all ones) to 33% (all zeros).
D The function data (24 bits) duty cycle can vary from 58% (one function enabled) to 33% (all functions
enabled).
D The dummy pulse (1 bit) always has a duty cycle of 100%.
D The blank time between frames (150 bits) always has a duty cycle of 0%.
D Highest possible duty cycle (48(0.5) + 120(0.66) + 24(0.58) + 1(1) + 150(0)) / 343 = 34%.
D Lowest possible duty cycle (48(0.5) + 120(0.33) + 24(0.33) +1(1) + 150(0)) / 343 = 21%.
Transmitted code format duty cycle is an important consideration when modulating an RF carrier because
regulations in many countries concerning maximum RF power output are specified as
average power. In that
respect, higher peak RF power levels can be used, giving increased range, with lower duty-cycle code formats,
such as that found in MARCSTAR systems. In the case of the U.S. FCC (Federal Communications Commission)
regulations, the average radiated field strength is measured, and the 100 ms sliding window of the highest
powered portion of the code frame from the RF transmitter, or the first repeating frame of data, whichever is
shorter, is sampled for average power.
The MARCSTAR I E/D device, configured as an encoder, has a 360 frame transmission timeout. When any
combination of VRC/TX1 – VRC/TX4 terminals are continuously held low, with a 500-Hz data clock rate, the
total transmission time before timeout is 360
× (2 × 10-3 seconds × 343) = 4.1 minutes. Likewise, for a 5-KHz
data clock rate, the total transmission time before timeout is 360
× (2 × 10-4 seconds × 343) = 25 seconds. At
a 1-KHz clock rate, the total transmission time before timeout is 360
× (1 × 10-3 seconds × 343) = 123 seconds.
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