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TDA4856 Datasheet, PDF (39/56 Pages) NXP Semiconductors – I2C-bus autosync deflection controller for PC monitors | |||
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Philips Semiconductors
I2C-bus autosync deï¬ection controller for
PC monitors
Product speciï¬cation
TDA4856
handbook, full pagewidth
(ANY Mode)
VCC < 8.1 V
Power-Down Mode
no acknowledge is given by IC
all register contents are random
L1 (1)
MGM079
VCC
8.6 V
8.1 V
VCC
8.6 V
8.1 V
a soft-down sequency followed by a
soft start sequence is generated
internally.
IC enters standby mode.
(1) See Fig.18.
Fig.20 I2C-bus flow for any mode.
Power-down mode
Power dip of VCC < 8.6 V:
⢠The soft-down sequence is started first.
⢠Then the soft-start sequence is generated internally.
Power dip of VCC < 8.1 V or VCC shut-down:
⢠This function is independent from the operating mode,
so it works under any condition.
⢠All driver outputs are immediately disabled
⢠IC enters standby mode.
Standby mode detection
Execute data transmission twice to assure that there was
no data transfer error.
Normal operation
I2C-bus transmission
chip address
subaddress
S
8CH
A
0XH
A
data
XXH
AP
yes
acknowledge was
given on data?
no
I2C-bus transmission
chip address
subaddress
S
8CH
A
0XH
A
data
XXH
AP
1999 Jul 13
yes
acknowledge was
given on data?
no
Standby mode
MGS276
Fig.21 Possible standby mode detection.
39
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