AK4707 Datasheet, PDF (24/42 Pages) Asahi Kasei Microsystems – AV SCART Switch

ASAHI KASEI
[AK4707]
5. Monitor Options and INT function
„ Monitor Options (08H: D4-D0)
The AK4707 has several detection functions. SVCR1-0 bits, FVCR bit, VCMON bit and TVMON bit reflect the input
DC level of VCR slow blanking, the input DC level of VCR fast blanking and signals input to TVVIN or VCRVIN pins.
SVCR1-0: VCR Slow blanking status monitor
SVCR1-0 bits reflect the voltage at VCRSB pin only when the VCRSB is in the input mode.
When the VCRSB is in the output mode, SVCR1-0 bits hold previous value.
VCRSB pin input level SVCR1 bit SVCR0 bit
< 2V
0
0
4.5V to 7V
0
1
(Reserved)
1
0
9.5V <
1
1
Table 14. VCR Slow Blanking monitor
FVCR: VCR Fast blanking input level monitor
This bit is enabled when TVFB bit = “1”.
VCRFB pin input level FVCR bit
< 0.4V
0
1V <
1
Table 15. VCR Fast Blanking monitor (Typical threshold is 0.7V)
VCMON: VCRVIN pin video input monitor (MCOMN bit = “1”),
TVVIN pin or VCRVIN pin video input monitor (MCOMN bit = “0”)
0: No video signal detected.
1: Detects video signal.
TVMON: TVVIN pin video input monitor (active when MCOMN bit = “1”)
0: No video signal detected.
1: Detects video signal.
AUTO
(00H D3)
0
0
0
0
0
0
0
0
1
1
1
1
MCOMN
(09H D7)
0
0
0
0
1
1
1
1
*
*
*
*
TVVIN signal
0
0
1
1
0
0
1
1
0
0
1
1
VCRVIN signal
0
1
0
1
0
1
0
1
0
1
0
1
TVMON
(08H D4)
0
0
0
0
0
0
1
1
0
0
0
0
Note 19. TVVIN/VCRVIN signal: signal 0 = No signal applied, signal 1 = signal applied
Table 16. TV/VCR Monitor Function
VCMON
(08H D3)
0
1
1
1
0
1
0
1
0
1
1
1
*:don’t care,
MS0551-E-00
- 24 -
2006/10