Philips Semiconductors
Product specification
I2C-bus autosync deflection controller for
PC monitors
TDA4856
Start-up sequence and shut-down sequence
MGS277
handbook, full pagewidth
V
CC
8.6 V continuous blanking off
(1)
PLL2 soft start/soft-down enabled
2
8.3 V data accepted from I C-bus
video clamping pulse and vertical outputs
enabled if control bit STDBY = 0
3.5 V
continuous blanking activated on pins CLBL and HUNLOCK
time
a. Start-up sequence.
MGS278
handbook, full pagewidth
V
CC
8.6 V continuous blanking activated on pins CLBL and HUNLOCK
(2)
PLL2 soft-down sequence is triggered
2
8.1 V no data accepted from I C-bus
video clamping pulse and vertical outputs disabled
3.5 V continuous blanking disappears
time
b. Shut-down sequence.
(1) See Fig.25a.
(2) See Fig.25b.
Fig.24 Activation of start-up sequence and shut-down sequence via supply voltage.
42
1999 Jul 13
NXP [ NXP ]
