01 / 01The SD1521 is a USB dedicated charging port controller that can be applied to in-vehicle chargers, AC-DC power adapters with USB ports, and other USB charging devices.SD1521 has the feature of automatic detection, it will timely load the correct identifiable signal on DP and DM by monitoring the change of the voltage on D + and D-, so as to realize the fast charging function of the compatible portable device connected to it.Supported portable devices include smartphones, 5V-charging tablets, and personal media players. SD1521 supports the following five most commonly used charging protocols: · Divider 1 (2V and 2.7V applied on D + and D- lines, respectively) · Divider 2 (2.7V and 2V applied on D + and D- lines, respectively) · BC1.2 protocol, USB battery charging technical specification 1.2 revision · China Telecom Industry Standard YD/T 1591-2009 · Apply 1.2V voltage on both D + and D-
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