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TDA4853 Datasheet(PDF) 14 Page - NXP Semiconductors |
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TDA4853 Datasheet(HTML) 14 Page - NXP Semiconductors |
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14 / 60 page  1999 Jul 13 14 Philips Semiconductors Product specification I2C-bus autosync deflection controllers for PC/TV monitors TDA4853; TDA4854 For supply voltages below 8.3 V the internal I2C-bus will not generate an acknowledge and the IC is in standby mode. This is because the internal protection circuit has generated a reset signal for the soft start register SOFTST. Above 8.3 V data is accepted and all registers can be loaded. If the register SOFTST has received a set from the I2C-bus, the internal soft start procedure is released, which activates all mentioned outputs. If during normal operation the supply voltage has dropped below 8.1 V, the protection mode is activated and HUNLOCK (pin 17) changes to the protection status and is floating. This can be detected by the microcontroller. This protection mode has been implemented in order to protect the deflection stages and the picture tube during start-up, shut-down and fault conditions. This protection mode can be activated as shown in Table 3. Table 3 Activation of protection mode When the protection mode is active, several pins of the TDA4853; TDA4854 are forced into a defined state: HDRV (horizontal driver output) is floating BDRV (B+ control driver output) is floating HUNLOCK (indicates, that the frequency-to-voltage converter is out of lock) is floating (HIGH via external pull-up resistor) CLBL provides a continuous blanking signal VOUT1 and VOUT2 (vertical outputs) are floating The capacitor at HPLL2 is discharged. If the soft start procedure is activated via the I2C-bus, all of these actions will be performed in a well defined sequence (see Figs 25 and 26). ACTIVATION RESET Low supply voltage at pin 10 increase supply voltage; reload registers; soft start via I2C-bus Power dip, below 8.1 V reload registers; soft start via I2C-bus X-ray protection (pin 2) triggered, XSEL (pin 9) is open-circuit or connected to ground reload registers; soft start via I2C-bus X-ray protection (pin 2) triggered, XSEL (pin 9) connected to VCC via an external resistor switch VCC off and on again, reload registers; soft start via I2C-bus HPLL2 (pin 30) externally pulled to ground release pin 30 |
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