CP2101 Silicon Laboratories Inc, CP2101 Datasheet - Page 14

• Manufacturer Part Number: CP2101
• Description: IC USB-TO-UART BRIDGE 28MLP
• Manufacturer: Silicon Laboratories Inc

Specifications of CP2101

• Applications: USB
• Interface: USB
• Voltage - Supply: 3 V ~ 3.6 V
• Package / Case: 28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

9.
The CP2101 includes an on-chip 5-to-3 V voltage regulator. This allows the CP2101 to be configured as
either a USB bus-powered device or a USB self-powered device. These configurations are shown in
Figure 9.1 and Figure 9.2. When enabled, the 3 V voltage regulator output appears on the V
be used to power external 3V devices. See Table 9.1 for the voltage regulator electrical characteristics.
Alternatively, if 3 V power is supplied to the V
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. This configuration is shown in Figure 9.3.
The USB max power and power attributes descriptor must match the device power usage and
configuration. See application note “AN144: CP2101 Customization Guide” for information on how to
customize USB descriptors for the CP2101.
Note:
It is recommended that additional decoupling capacitance (e.g., 0.1 µF in parallel with 1.0 µF) be provided
on the REGIN input.
–40 to +85 °C unless otherwise specified
Input Voltage Range
Output Voltage
VBUS Detection Input Threshold
Bias Current
* The maximum regulator supply current is 100 mA.
Voltage Regulator
From VBUS
Power Net
Parameter
To 3 V
Table 9.1. Voltage Regulator Electrical Specifications
Figure 9.1. Configuration 1: USB Bus-Powered
REGIN
VBUS
V
Output Current = 1 to 100 mA*
DD
CP2101
DD
Conditions
pin, the CP2101 can function as a USB self-powered
5 V In
Rev. 1.6
Voltage Regulator (REG0)
VBUS Sense
3 V Out
Min
4.0
3.0
1.0
—
Typ
3.3
1.8
90
—
Power Net
Device
CP2101
DD
Max
5.25
TBD
3.6
4.0
pin and can
Units
µA
V
V
V
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