TDA4856 Datasheet, PDF (42/56 Pages) NXP Semiconductors – I2C-bus autosync deflection controller for PC monitors

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