SLUAAL1 June   2022 UCD90120A , UCD90124A , UCD90160 , UCD90160A , UCD90320 , UCD90320U , UCD9090 , UCD9090A

 

  1.   How to Access UCD90xxx Sequencers GPIO
  2.   Trademarks
  3. 1Introduction
  4. 2GPIO Capacity
  5. 3PMBus™ Commands to Access GPIO
    1. 3.1 (FAh) GPIO_SELECT (MFR_SPECIFIC_42)
    2. 3.2 (FBh) GPIO_CONFIG (MFR_SPECIFIC_43)
  6. 4Examples
    1. 4.1 Configure GPIO to Hi-Z
    2. 4.2 Configure GPIO to Output HIGH or LOW
    3. 4.3 Read GPIO Status
  7. 5References

3 PMBus™ Commands to Access GPIO

UCD90xxx sequencer provides a pair of commands to access GPIO pins. These two commands are GPIO_SELECT (command code 0xFA) and GPIO_CONFIG (command code 0xFB). Both commands follow read/write protocol defined by SMBUS as shown in Figure 3-1.

GUID-20220609-SS0I-KHZM-P7TV-GDVZV8FDNXLT-low.png Figure 3-1 Write-Read Byte Protocol