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TDA4853 Datasheet, PDF (38/60 Pages) NXP Semiconductors – I2C-bus autosync deflection controllers for PC/TV monitors | |||
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Philips Semiconductors
I2C-bus autosync deï¬ection controllers for
PC/TV monitors
Product speciï¬cation
TDA4853; TDA4854
L4
S 8CH A 0DH A 00H A P
Soft-down sequence (XXXX XX00)
STDBY = 0
SOFTST = 0
Protection mode (XXXX XX00)
STDBY = 0
SOFTST = 0
registers are set
no
STDBY = 1?
yes
no
SOFTST = 1?
yes
L3 (1)
S 8CH A 0DH A 01H A P
Standby mode (XXXX XX01)
STDBY = 1
SOFTST = 0
all other register contents are random
L2 (1)
MBK382
(1) See Fig.20.
Fig.21 I2C-bus flow for protection and standby
mode.
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 = donât 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.
1999 Jul 13
38
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