TA1318N Datasheet, PDF (15/41 Pages) Toshiba Semiconductor – TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic

TA1318N
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 µs
Where H-FREQUENCY is 33.75 kHz/45 kHz, Z = 474.1 µs
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 µs (error: ±1 µs).
• 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.
Read Timing
V-SYNC or VD
Start trigger 1
More than 60 ms
Data 1 and
Start trigger 2
Data 2 and
Start trigger 3
Counting period 1
(to Data 1)
Counting period 2
(to Data 2)
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.
15
2003-02-19