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BK3266TS28 Datasheet(PDF) 16 Page - Beken Corporation |
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BK3266TS28 Datasheet(HTML) 16 Page - Beken Corporation |
16 / 28 page ![]() Low Power Bluetooth Audio SoC v 0.5 © 2017 Beken Corporation Proprietary and Confidential Page 16 of 28 There is tunable load capacitance from 6 to 18 pF (both side have this capacitance) with 64 steps to tune the crystal frequency, that no external capacitance is needed. 3.10. Power Management The power management system on the BK3266 includes a battery charger, two buck regulators which can be configured as low–drop out (LDO) regulators and several internal LDO regulators to provide voltage and noise isolation to various parts of the chip. The BK3266 can be powered directly from a 2.8V to 4.2V external battery via the VCC4BAT pin or it can be powered from a 4.75V to 5.75V USB power supply via the VCC5USB pin. For battery powered applications, the BK3266 will generate 3.2V to the VCC3SYS pin using the SYS LDO regulator for the other of the chip to run off of. When USB power is available, the BK3266 will get its power from the USB power supply and will use the USB LDO regulator to generate 3.3V for the rest of the system to run from. If a low voltage battery is connected while the USB power supply is applied, the BK3266 will automatically charge the battery using charge current control while providing power to the chip through the USB LDO regulator. When BUCK is enabled, the internal analog and digital buck regulators (BUCKA, BUCKD) directly work under VBAT; The VCC3SYS regulated output voltage serves as the voltage source to all others of the chip. The LDO regulators (LDOA, LDOD, XTAL, Flash and digital) all use the VCC3SYS output voltage as their input voltage. Outputs from the buck and LDO regulators require proper bypass capacitors to reduce supply noise and these outputs are to be used only by the BK3266. Please refer to the BK3266 EVB Users Guide or application note for more details about choosing the proper bypass capacitors. Also one BUCK mode is available. In this condition, BUCKA is on, and BUCKD is off; and LDOD is work under output of BUCKA. The two on-chip buck converters reduce the current consumption by about 50% and thus provide a significant improvement in overall chip power consumption. The BK3266 can enter standby mode when there is no active connection. The standby mode can be awakened by any GPIO signal and by applying the USB power supply. 3.11. GPIO and LED Driver The BK3266 has a total 16 GPIOs, which can be configured as either input or output. Most of them have a second function as shown below: |
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