C8051F321-GMR Datasheet, PDF (68/250 Pages) Silicon Laboratories – Full Speed USB, 16 k ISP FLASH MCU Family

C8051F320/1
Important Note: When USB is selected as a reset source, a system reset will be generated when the
VBUS signal matches the polarity selected by the VBPOL bit. See Section “10. Reset Sources” on page 99
for details on selecting USB as a reset source.
Table 8.1. Voltage Regulator Electrical Specifications
–40 to +85 °C unless otherwise specified.
Parameter
Conditions
Min Typ Max Units
Input Voltage Range¹
2.7 — 5.25 V
Output Voltage (V_DD)²
Output Current = 1 to 100 mA
3.0 3.3 3.6
V
Output Current²
—
— 100 mA
VBUS Detection Input Low Voltage
—
— 1.0
V
VBUS Detection Input High Voltage
3.0 —
—
V
Bias Current
Normal Mode (REGMOD = 0)
Low Power Mode (REGMOD = 1)
—
65
35
111
61
µA
Dropout Voltage (V_DO)³
—
1
— mV/mA
Notes:
1. Input range specified for regulation. When an external regulator is used, REGIN should be tied to V_DD.
2. Output current is total regulator output, including any current required by the C8051F320/1.
3. The minimum input voltage is 2.70 V or VDD + V_DO (max load), whichever is greater.
C8051F320/1
From VBUS
To 3V
Power Net
VBUS
REGIN
VDD
VBUS Sense
5V In
Voltage Regulator (REG0)
3V Out
Device
Power Net
Figure 8.2. REG0 Configuration: USB Bus-Powered
68
Rev. 1.4