User Manual

4
1. Power Supply
The CM-43438-V1 module supports SDIO bus power level DC 3.3V, 2.8V or 1.8V. If the voltage level
of SDIO bus is DC 3.3V, like most PC or NB, then CM-43438-V1 can be powered by this single DC 3.3V
from SDIO bus. But if the voltage level of SDIO bus is DC 2.8V or 1.8V, most the embedded platforms.
SDIO bus power
Supply
3.3V
2.8V
1.8V
Jumper 4
Short Jumper4
(Plug in jumper
connector)
Open Jumper4
(Remove jumper
connector)
Open Jumper4
(Remove jumper
connector)
WiFi interface and SDIO bus power option
The WiFi interface on CM-43438-V1 is SDIO, and it works under different SDIO bus power conditions such
as DC 3.3V, 2.8V or 1.8V.
Please open the connector of J4 to provide an additional DC 3.3V power supply to CM-43438-V1 when it be
used under SDIO bus power of DC 2.8V or 1.8V(The additional DC 3.3V is supplied from a PWM circuit from
power of micro-USB, so remember to connect DC power into the micro-USB).
Please close the connector of J4 when SDIO bus power is DC 3.3V.