參數(shù)資料
型號(hào)： TA1318NG
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PDIP24
封裝： 0.300 INCH, 1.78 MM PITCH, PLASTIC, SDIP-24
文件頁(yè)數(shù)： 7/41頁(yè)
文件大?。?/td> 896K
代理商： TA1318NG
TA1318NG
2005-09-08
15
Read Mode
POR (Power on reset)
(0): Status read (at second data read and subsequent)
(1): Power on (at first data read)
HD-IN (Input signal self-check result)
Detects HD or H-SYNC input signal selected by INPUT SW.
(0): No signal input (1): Signal input
V FREQ DET (Vertical frequency of SYNC or VD input selected by FREQ DET SW)
(0000000)(0001100): No-VD
(0001101) : Vicinity of 162 Hz
(1111110) : Vicinity of 17 Hz
How to calculate vertical frequency (X):
Convert V-FREQ DET read data into decimal and define the resulting value as Y.
Where H-FREQUENCY is 15.75 kHz/31.5 kHz, Z = 476.2 s
Where H-FREQUENCY is 33.75 kHz/45 kHz, Z = 474.1 s
Vertical frequency (X) = 1 ÷ (Y × Z) [Hz]
Error of Y is +1, 0. If vertical frequency is 162 Hz or more, the frequency cannot be accurately
measured. Time constant used to separate V.SYNC from integrated C.SYNC is 9 s (error: ±1 s).
H FREQ DET (Horizontal frequency of SYNC or HD input selected by FREQ DET SW)
(0000000): No signal input (1111110): 53 kHz or more
How to calculate horizontal frequency (X):
X, Y, and Z are defined same as for V FREQ.
Horizontal frequency (X) = Y ÷ (5 × Z) [kHz]
Error of Y is +1, 0. If horizontal frequency is 53 kHz or more, the frequency cannot be accurately
measured. When V-SYNC or VD is not input, horizontal frequency cannot be measured, resulting in
data = (0000000).
Note 1: The start trigger for frequency counting is the internal reset-pulse made from ACK of 2nd byte in BUS
read mode. The counting period is between the first V-sync (VD) and the second V-sync (VD) after the
trigger.
The counted data will have +1 or 0 error according to the read timing.
To assume stable data reading;
1. Set BUS reading interval more than 60 ms.
2. Don’t use the first data because it is unsettled.
are recommended.
Note 2: Make data (1111111) invalid in your programs. This data may be obtained in case the trigger pulse and
the V-sync (VD) are simultaneous.
Note 3:Make following data invalid in your programs. These data are obtained when the pin voltage of SYNC-IN
pin is higher than sync separation level and while any signal is not input into SYNC-IN pin.
(H FREQUENCY DET, V FREQUENCY DET)
= (0000001, 0001101), (0000001, 0001110), (0000111, 1111111), (0000000, 1111111),
and (0000101, 1111111)
Decision algorithm (detection range, detection times and so on) should be determined under
consideration of Note 1, Note 2 and the other factors such as signal strength, existence of ghost signal,
H-AFC stability, I2C BUS data transmission and so on via prototype TV set evaluation.
Read Timing
V-SYNC or VD
More than 60 ms
Counting period 1
(to Data 1)
Counting period 2
(to Data 2)
Start trigger 1
Data 1 and
Start trigger 2
Data 2 and
Start trigger 3
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