TDA9116 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'TDA9116' PDF : 47 Pages View PDF
TDA9116
10.8 - MISCELLANEOUS
10.8.1 - Safety functions
The safety functions comprise supply voltage
monitoring with appropriate actions, soft start and
soft stop features on H-drive and B-drive signals
on HOut and BOut outputs and X-ray protection.
For supply voltage supervision, refer to paragraph
Power supply and voltage references on page 26
and Figure 1. A schematic diagram putting togeth-
er all safety functions and composite PLL1 lock
and V-blanking indication is in Figure 15.
10.8.2 - Soft start and soft stop functions
For soft start and soft stop features for H-drive and
B-drive signal, refer to paragraph Soft-start and
soft-stop on H-drive on page 30 and sub chapter-
DC/DC CONTROLLER SECTION on page 35, re-
spectively. See also the Figure 10. Regardless
why the H-drive or B-drive signal are switched on
or off (I2C bus command, power up or down, X-ray
protection), the signals always phase-in and
phase-out in the way drawn in the figure, the first
to phase-in and last to phase-out being the H-drive
signal, which is to better protect the power stages
at abrupt changes like switch-on and off. The tim-
ing of phase-in and phase-out only depends on
the capacitance connected to HPosF pin which is
virtually unlimited for this function. Yet it has a dual
function (see paragraph PLL1 on page 27), so a
compromise thereof is to be found.
10.8.3 - X-ray protection
The X-ray protection is activated if the voltage lev-
el on XRay input exceeds VThrXRay threshold. As a
consequence, the H-drive and B-drive signals on
HOut and BOut outputs are inhibited (switched off)
after a 2-horizontal deflection line delay provided
to avoid erratic excessive X-ray condition detec-
tion at short parasitic spikes. The XRayAlarm I2C
bus flag is set to 1 to inform the MCU.
This protection is latched; it may be reset either by
VteCr C Id2CropBoUr Sby CI2OCNbTuRsObLit
XRayReset (see chap-
REGISTER MAP on
page 22).
37/47
Share Link: 
