SLVS927F March 2009 – July 2018 TPS65023-Q1
PRODUCTION DATA.
If DEFDCDC1 is connected to ground and DCDC1_EN is pulled high after VINDCDC1 is applied, the output voltage of DCDC1 defaults to 1.225 V instead of 1.2 V (high by 2%). Figure 42 illustrates the problem.
Workaround 1: Tie DCDC1_EN to VINDCDC1 (Figure 43)
Workaround 2: Write the correct voltage to the DEF_CORE register through I2C. This can be done before or after the converter is enabled. If written before the enable, the only bit changed is DEF_CORE[0]. The voltage is 1.2 V, however, when the enable is pulled high (Figure 44).
Workaround 3: Generate a HOT_RESET after enabling DCDC1 (Figure 45)