ADV7182ABCPZ datasheet(13/102 Pages) AD

13 / 102 page

Data Sheet

ADV7182A

Rev. 0 | Page 13 of 102

POWER SUPPLY SEQUENCING

OPTIMAL POWER-UP SEQUENCE

The optimal power-up sequence for the ADV7182A is

guaranteed by production testing.

The optimal power-up sequence for the ADV7182A is to first

power up the 3.3 V DVDDIO supply, followed by the 1.8 V supplies

(DVDD, PVDD, and AVDD).

When powering up the ADV7182A, follow these steps. During

power-up, all supplies must adhere to the specifications listed in

the Absolute Maximum Ratings section.

Assert the PWRDWN pin and the RESET pin (pull the

pins low).

Power up the DVDDIO supply.

After DVDDIO is fully asserted, power up the 1.8 V supplies.

After the 1.8 V supplies are fully asserted, pull the

PWRDWN pin high.

Wait 5 ms and then pull the RESET pin high.

After all power supplies, the PWRDWN pin, and the

RESET pin are powered up and stable, wait an additional

5 ms before initiating I2C communication with the

ADV7182A.

SIMPLIFIED POWER-UP SEQUENCE

The simplified power-up sequence is guaranteed by

characterization.

Alternatively, the ADV7182A can be powered up by asserting

all supplies and the PWRDWN pin simultaneously. During this

operation, the RESET pin must remain low. After the supplies

and PWRDWN are fully asserted, wait at least 5 ms before

bringing the RESET pin high. After the RESET pin is fully asserted,

wait an additional 5 ms before initiating I2C communication with

the ADV7182A.

While the supplies are being established, take care to ensure that

a lower rated supply does not go above a higher rated supply level.

During power-up, all supplies must adhere to the specifications

listed in the Absolute Maximum Ratings section.

POWER-DOWN SEQUENCE

The ADV7182A supplies can be deasserted simultaneously as

long as DVDDIO does not go below a lower rated supply.

UNIVERSAL POWER SUPPLY

It is possible to power all the supplies (DVDD, PVDD, AVDD, and

DVDDIO) to 1.8 V. In this case, apply the power-up sequences as

described in the Optimal Power-Up Sequence section and the

Simplified Power-Up Sequence section. The only change is that

DVDDIO is powered up to 1.8 V instead of 3.3 V.

In this setup,



Power up the PWRDWN pin and the RESET pin to 1.8 V

instead of 3.3 V.



Set the drive strengths of the digital outputs of the ADV7182A

to the maximum setting (see the Global Pin Control section).



Connect any pull-up resistors connected to pins on the

ADV7182A (such as the SCLK pin and the SDATA pin) to

1.8 V and not 3.3 V.

Figure 5. Recommended Power-Up Sequence

3.3V

1.8V

TIME

3.3V SUPPLY

POWER-UP

1.8V SUPPLIES

POWER-UP

3.3V SUPPLY

PWRDWN PIN

POWER-UP

RESET PIN

POWER-UP

5ms

RESET

OPERATION

5ms

WAIT

RESET PIN

1.8V SUPPLIES

ADV7182ABCPZ датащи(PDF) 13 Page - Analog Devices

ADV7182ABCPZ датащи(HTML) 13 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL