ZHCSI54A September 2016 – May 2018 BQ25890H
PRODUCTION DATA.
The device provides independent controlled voltage output drivers on D+ and D- pins to interface or emulate non-standard adapters when input source is plugged-in or OTG mode is enabled. The D+/D- drivers are disabled in high impedance mode (HiZ) by default or when DP_DAC or DM_DAC bits are set to 000. The drivers are enabled and controlled independently with predefined voltage threshold when DP_DAC and DM_DAC bits are set to values between 001 to 110.
When input source is plugged-in, the output drivers control (DP_DAC and DM_DAC) are reset to HiZ (000) to execute USB BC1.2 and built-in handshake during the input source type detection. The host is recommended to change DP_DAC and DM_DAC settings after input source type detection when VBUS_STAT/PG_STAT bits are updated.
When OTG mode is enabled, the drivers can be enabled to provide electrical signature on D+/D- to emulate USB non-standard adapters (Divider 1-4) as shown in Table 1.