User's Manual

Class 1 Bluetooth v2.0 Module
User’s Guide
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www.lairdtech.com/bluetooth
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CONN-GUIDE-BT730_v0.9
USB Signal Levels.vdd_usb refers to the internal voltage generated by the LDO regulator on the module,
which is typically 3.3 V. Hence 0.3vdd_usb and 0.7vdd_usb correspond to 1.0 V to 2.3 V. To achieve
3.3V for vdd_usb requires VCC_IN of 3.5V. USB IO voltage levels follows VCC_3V3. For correct USB
operation, would require vdd_usb on 3.1V which requires of VCC_IN of ~3.3V (0.2V LDO drop).