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TDA4853 Datasheet(PDF) 38 Page - NXP Semiconductors |
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TDA4853 Datasheet(HTML) 38 Page - NXP Semiconductors |
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38 / 60 page  1999 Jul 13 38 Philips Semiconductors Product specification I2C-bus autosync deflection controllers for PC/TV monitors TDA4853; TDA4854 Protection and standby mode Soft-down sequence: • Start the sequence by setting control bit SOFTST = 0 • BDRV duty cycle decreases • HDRV duty cycle decreases. Protection mode: • Pins HDRV and BDRV are floating • Continuous blanking at pin CLBL is active • Pin HUNLOCK is floating • PLL1 and PLL2 are disabled • Register contents are kept in internal memory. Protection mode can be left by 3 ways: 1. Entering standby mode by setting control bit SOFTST = 0 and control bit STDBY = 1 2. Starting the soft-start sequence by setting control bit SOFTST = 1 (bit STDBY = don’t care); see L3 of Fig.20 for continuation 3. Decreasing the supply voltage below 8.1 V. Standby mode: • Set control bit STDBY = 1 • Driver outputs are floating (same as protection mode) • Supply current is 9 mA • Only the I2C-bus and protection circuits are operative • Contents of all registers except the value of bit STDBY and bit SOFTST are lost • See L2 of Fig.20 for continuation. MBK382 Standby mode (XXXX XX01) STDBY = 1 SOFTST = 0 all other register contents are random Soft-down sequence (XXXX XX00) STDBY = 0 SOFTST = 0 L4 L3 (1) no yes SOFTST = 1? yes L2 (1) Protection mode (XXXX XX00) STDBY = 0 SOFTST = 0 registers are set no STDBY = 1? S 8CH A 0DH A 00H A P S 8CH A 0DH A 01H A P Fig.21 I2C-bus flow for protection and standby mode. (1) See Fig.20. |
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