參數(shù)資料
型號(hào)： TA1318N
廠商： Toshiba Corporation
元件分類： 通用總線功能
英文描述： SYNC Processor, Frequency Counter IC for TV Component Signals
中文描述： 同步處理器，頻率計(jì)數(shù)器集成電路電視分量信號(hào)
文件頁(yè)數(shù)： 15/42頁(yè)
文件大?。?/td> 629K
代理商： TA1318N
TA1318N
2003-02-19
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
μ
s
Where H-FREQUENCY is 33.75 kHz/45 kHz, Z
=
474.1
μ
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
μ
s (error:
±
1
μ
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: Ignore data (1111111). This data may be obtained in case the trigger pulse and the V-sync (VD) are
simultaneous.
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, I
2
C 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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