14
UT986 Series Peripheral Design
UC-08-M37 EN R1.0
Figure 5-2 Markings on the Right of the LED Indicators
6
UT986 Series Peripheral Design
TVS anti-surge protection is added at the input of the module. ESD protection
is added at all pins.
Use large and small VCC filter capacitors together, with a total capacitance
greater than 30 μF.
Add series resistors at the IO pins for the convenience of debugging.
VCCIN powers the module only. R18 is a large-size resistor (with high rated
power) to ensure the current capability. In the figure below, a 0805 resistor is
used.
Removing R18, connecting a power supply wire at TP1 and a ground wire at
TP2 (as shown in Figure 7-1), you can use an external power to supply the
module. This method can be used to measure the input voltage and current of
the module.
