SLVUB50C June   2017  – March 2019 UCD90120A , UCD90124A , UCD90160 , UCD90160A , UCD90240 , UCD90320 , UCD90320U , UCD9090 , UCD9090-Q1 , UCD9090A , UCD90910

 

  1.   UCD90xxx Sequencer Schematics Guidelines
    1. 1 Introduction
    2. 2 UCD Power Supply Review
      1. 2.1 UCD90240, UCD90320 and UCD90320U
      2. 2.2 Remaining UCD90xxx Devices
    3. 3 I/O Signals Review
      1. 3.1 Analog Monitor (MONx/AMONx) Pin Review
      2. 3.2 PMBUS Signals Review
      3. 3.3 GPIO Pins Review
      4. 3.4 Margin Pins Review
      5.      Trademarks
  2.   Revision History

3.2 PMBUS Signals Review

Pull up SCL and SDA (2.2 kΩ recommended) to the same power supplies as the UCD devices. The ALERT signal is pulled up to the same 3.3-V source as SCL or SDA. When the CONTROL pin is not used, either pull it down or up, the device does not care about the input state of the CONTROL pin. Do not leave it floating.

For the UCD90xxx (other than the UCD90240,UCD90320 and UCD90320U), make sure the resistors used for PMBUS_ADDRESS give a valid 7-bit I2C address other than 126.