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UCS1002-3 Datasheet(PDF) 42 Page - Microchip Technology |
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UCS1002-3 Datasheet(HTML) 42 Page - Microchip Technology |
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42 / 114 page  UCS1002-3 DS20006852A-page 42 2023 Microchip Technology Inc. and its subsidiaries 9.8.1 EMULATION RESET Prior to applying any of the charger emulation profiles, the UCS1002-3 performs an Emulation Reset. This means that the UCS1002-3 resets the VBUS line by disconnecting the port power switch and connecting VBUS to ground via an internal 100 resistor for tDISCHARGE time. The port power switch is held open for a time equal to tEM_RESET at which point the port power switch is closed and the VBUS voltage is applied. The DPOUT and DMOUT pins are pulled low using internal 15 k pull-down resistors. 9.8.2 EMULATION CYCLING In Dedicated Charger Emulation Cycle mode, the charger emulation profiles, if enabled, are applied in the following order: 1. Legacy 1 2. BC1.2 DCP 3. Legacy 2 4. Legacy 3 5. Legacy 4 6. Legacy 5 7. Legacy 6 8. Legacy 7 9. Custom (disabled by default). If the CS_FRST configuration bit is set, then the Custom charger emulation profile is tested first and the order proceeds as given. The UCS1002-3 applies a charger emulation profile until one of the following exit conditions occurs: • Current greater than IBUS_CHG is detected flowing out of VBUS at the respective emulation timeout time. In this case, the profile is assumed to be accepted and no other profiles is applied. • The respective emulation timeout (tEM_TIMEOUT) time is reached without current that exceeds the IBUS_CHG limit flowing out of VBUS (the emulation timeout is enabled by default, see Section 10.4.2 “Emulation Configuration Register” and Register 10-35). The profile is assumed to be rejected, and the UCS1002-3 performs the Emulation Reset and applies the next profile, if one exists. Emulation timeouts can be programmed for each charger emulation profile (see Section 10.11 “Preloaded Emulation Timeout Configuration Registers” and Register 10-35). 9.8.3 DCE CYCLE RETRY If none of the charger emulation profiles cause a charge current to be drawn, the UCS1002-3 performs the Emulation Reset and cycles through the profiles again if the EM_RETRY bit is set (default – see Section 10.4.2 “Emulation Configuration Regis- ter”). The UCS1002-3 continues to cycle through the profiles as long as charging current is not drawn and the PWR_EN control is enabled. If the Emulation Retry is not enabled, the UCS1002-3 flags “No Handshake” and end the DCE Cycle using Trip Current Limiting. Note: To help prevent possible damage to a portable device, the DPOUT and DMOUT pins have current limiting in place when the emulation profiles are applied. Note: If S0 = ‘0’ and a portable device is not attached in DCE Cycle mode, the UCS1002-3 is cycling through charger emulation profiles (by default). There is no guarantee which charger emulation profile is applied first when a portable device is attached. |
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