DDP3300A datasheet(21/53 Pages) MICRONAS

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PRELIMINARY DATA SHEET

DDP 3300 A

MICRONAS INTERMETALL

locked clock from the horizontal PLL is performed by the

CCU.

VSTBY

VSUPD

∼50 µs

normal

mode

standby

mode

Internal

Reset

internal

oszillator

CLK5

5 MHz Clock

Clock

Release

HOUT

Fig. 2–20: DDP power on, standby on/off

∼4 µs

normal

mode

2.4.3. DDP Standby On/Off

Switching the DDP to Standby Mode is more critical be-

cause of the HOUT output signal. Before the standby

mode is entered, the clock source for the horizontal out-

put generator has to be switched to the standby clock.

Switching to Standby Mode can be done by the CCU as

a reaction to a remote control command (see register 53,

EHPLL

+ disable) or by the internal voltage supervision

of the DDP. This voltage supervision activates the Power

Down signal when the supply for the digital circuits

(VSUPD) goes below VSUPD–pd (X4.5 V). The Power

Down signal switches the clock source for the HOUT

generation to the standby clock and sets the duty factor

to 50%. This is exactly what the EHPLL bit does.

Because the clocks from the DDP–pll and the standby

clock are not in phase, the actual phase (High/Low) of

the HOUT signal may be up to one pll or standby clock

(

X1 µs) longer than a regular one when the clock source

is changed.

The voltage supervising reacts if VSUPD goes below

VSUPD–pd for more than 50 ns. This Power Down signal

is extended by 50

µs after VSUPD is back again.

When switched off, the negative slope of the supply

voltage VSUPD should not be larger than approximately

0.2 V/

µs (see Recommended Operating Conditions).

RESETQ

POR

UPDATE

µs

Fig. 2–21: External RESET

2.4.4. Reset DDP

Reset of most functions (exception see below) is per-

formed by different sources:

– power on circuit (VSTBY, VSUPD)

– reset pin (DDP)

voltage

superv.

5 MHz clock

release clock

VSTBY

Reset Pin

voltage

superv.

VSUPD

Reset

CLK5

observer

(to HOUT gen)

Fig. 2–22: DDP reset generation

If one of these sources creates a reset, all the internal

registers and counters are set to zero. When this reset

source becomes inactive, the internal reset is still active

for 4

µs. After that time all the internal registers are

loaded with the values defined in the defaults ROM. All

the registers which are updated with the vertical sync

(chain registers) get these values with the next vertical

sync. During this initialization procedure (approx. 60

µs)

it is not possible to access the DDP via the I2C-bus.

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