ta1318af TOSHIBA Semiconductor CORPORATION, ta1318af Datasheet - Page 15

• Manufacturer Part Number: ta1318af
• Description: Sync Processor, Frequency Counter Ic For Tv Component Signals
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Read Mode
POR (Power on reset)
HD-IN (Input signal self-check result)
V FREQ DET (Vertical frequency of SYNC or VD input selected by FREQ DET SW)
H FREQ DET (Horizontal frequency of SYNC or HD input selected by FREQ DET SW)
Note: The start trigger for frequency counting is the internal reset-pulse made from ACK of 2nd byte in BUS
consideration of Note 1, Note 2 and the other factors such as signal strength, existence of ghost signal,
H-AFC stability, I
Detects HD or H-SYNC input signal selected by INPUT SW.
How to calculate vertical frequency (X):
How to calculate horizontal frequency (X):
Decision algorithm (detection range, detection times and so on) should be determined under
(0): Status read (at second data read and subsequent)
(1): Power on (at first data read)
(0): No signal input (1): Signal input
(0000000) (0001100): No-VD
(0001101) : Vicinity of 162 Hz
(1111111) : Vicinity of 17 Hz
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
Where H-FREQUENCY is 33.75 kHz/45 kHz, Z
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:
(0000000): No signal input (1111111): 53 kHz or more
X, Y, and Z are defined same as for V FREQ.
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
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;
are recommended.
Read Timing
V-SYNC or VD
Vertical frequency (X)
Horizontal frequency (X)
(0000000).
1. Set BUS reading interval more than 3 V.
2. Don’t use the first data because it is unsettled.
2
C BUS data transmission and so on via prototype TV set evaluation.
Counting period 1
Start trigger 1
(to Data 1)
1
Y
More than 3 V
(Y
(5
Z) [Hz]
Z) [kHz]
15
474.1 s
476.2 s
Counting period 2
Data 1 and
Start trigger 2
(to Data 2)
Data 2 and
Start trigger 3
TA1318AF
2003-02-19
1 s).