Users Manual Part 1
Page 15 of 21
4.5Precautions
1. Power supply
It is recommended to use the DC stabilized power supply to supply power to the
module. The power supply ripple is as small as possible. Generally, the ripple is less than
30mV. Excessive ripple may cause low sensitivity and poor connection quality. And the
Bluetooth transmit signal will be coupled into the interference signal, causing the RF
indicator to exceed the Bluetooth specification. In severe cases, it will be unable to connect
and communicate. Try to use LDO to supply power to the module. The LDO should be
away from the DC-DC power supply and inductance to prevent DC-DC radiation from
contaminating the LDO's power supply. The module needs to be grounded reliably, and
please pay attention to the correct connection of the positive and negative poles of the
power supply. If a reversed connection is made, the module may be permanently damaged.
2. ESD electrostatic protection
Users should pay attention to the static requirements of the product when designing,
see Table 2-1, and add static protection measures when designing the terminal product.