CP2102-GM View Datasheet(PDF) - Silicon Laboratories
Part Name
Description
Manufacturer
CP2102-GM Datasheet PDF : 26 Pages
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CP2102/9
10. Voltage Regulator
The CP2102/9 includes an on-chip 5 to 3 V voltage regulator. This allows the CP2102/9 to be configured as either
a USB bus-powered device or a USB self-powered device. These configurations are shown in Figure 6, Figure 7,
Figure 8, Figure 9, and Figure 10. When enabled, the 3 V voltage regulator output appears on the VDD pin and can
be used to power external 3 V devices. See Table 6 for the voltage regulator electrical characteristics.
Alternatively, if 3 V power is supplied to the VDD pin, the CP2102/9 can function as a USB self-powered device with
the voltage regulator disabled. For this configuration, it is recommended that the REGIN input be tied to the 3 V net
to disable the voltage regulator. In addition, if VDD or REGIN may be unpowered while VBUS is 5 V, a resistor
divider (or functionally-equivalent circuit) shown in Note 1 of Figure 8 and Figure 10 is required to meet the
absolute maximum voltage on VBUS specification in Table 2.
The USB max power and power attributes descriptor must match the device power usage and configuration. See
“AN721: CP210x/CP211x Device Customization Guide” for information on how to customize USB descriptors for
the CP2102/9.
Note: It is recommended to connect additional decoupling capacitance (e.g., 0.1 µF in parallel with 1.0 µF) to the REGIN input.
CP2102/9
VBUS
From VBUS
1.0 F
To 3 V
Power Net
4.7 F
REGIN
0.1 F
VDD
0.1 F
VBUS Sense
5 V In
Voltage Regulator (REG0)
3 V Out
Device
Power Net
Figure 6. Configuration 1: USB Bus-Powered
Rev. 1.8
19
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