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ADV7182WBCPZ-RL Datasheet(PDF) 11 Page - Analog Devices |
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ADV7182WBCPZ-RL Datasheet(HTML) 11 Page - Analog Devices |
11 / 96 page Data Sheet ADV7182 Rev. A | Page 11 of 96 POWER SUPPLY SEQUENCING POWER-UP SEQUENCE The recommended power-up sequence of the ADV7182 is 1. 3.3 V supply (DVDDIO) 2. 1.8 V supplies (DVDD, PVDD, AVDD) Note the following: Power up the DVDDIO supply first. This is true regardless if DVDDIO is powered up to 3.3 V or 1.8 V. Power up the 1.8 V supplies only after DVDDIO has been fully asserted. Assert (pull low) the PWRDWN and RESET pins while the supplies are being powered up. A 5 ms reset operation is needed after power-up. See the Power-On RESET section for further details. After all the power supplies and the PWRDWN and RESET pins are powered-up and stable, a further 5 ms delay is needed before I2C communication can be performed with the ADV7182. During power-up, all supplies must adhere to the specifications listed in the Absolute Maximum Ratings section. The ADV7182 can be alternatively powered up by asserting all supplies simultaneously. In this case, care must be taken to ensure that a lower rated supply does not go above a higher rated supply level as the supplies are being established. POWER-ON RESET After power-up, it is necessary to execute a reset operation. For correct operation, RESET should remain asserted (pulled low) for 5 ms after power supplies are stable and within specification, and PWRDWN is deasserted (pulled high). POWER-DOWN SEQUENCE The ADV7182 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 setup, note the following: Follow the power-up sequence described in the Power Supply Sequencing section. Power up the DVDDIO supply to 1.8 V instead of 3.3 V. Also, power up the PWRDWN and RESET pins to 1.8 V instead of 3.3 V. Set the drive strengths of the digital outputs of the ADV7182 to their maximum setting. See the Global Pin Control section. Connect any pull-up resistors connected to pins on the ADV7182 (such as the SCLK and SDATA pins) to 1.8 V and not 3.3 V. Figure 5. Recommended Power-Up Sequence 3.3V 1.8V TIME 3.3V SUPPLIES POWER-UP 1.8V SUPPLIES POWER-UP 3.3V SUPPLIES PWRDWN PIN PWRDWN PIN POWER-UP RESET PIN POWER-UP 5ms RESET OPERATION RESET PIN 1.8V SUPPLIES |
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