C8051F34A-GMR Silicon Labs, C8051F34A-GMR Datasheet - Page 69

• Manufacturer Part Number: C8051F34A-GMR
• Description: 8-bit Microcontrollers - MCU 48 MIPS 64KB 10ADC
• Manufacturer: Silicon Labs

Specifications of C8051F34A-GMR

• Rohs: yes
• Core: 8051
• Processor Series: C8051
• Data Bus Width: 8 bit

8.
C8051F34x devices include a voltage regulator (REG0). When enabled, the REG0 output appears on the
V
REGEN in register REG0CN. See Table 8.1 for REG0 electrical characteristics.
Note that the VBUS signal must be connected to the VBUS pin when using the device in a USB network.
The VBUS signal should only be connected to the REGIN pin when operating the device as a bus-powered
function. REG0 configuration options are shown in Figure 8.1–Figure 8.4.
8.1.
REG0 offers a low power mode intended for use when the device is in suspend mode. In this low power
mode, the REG0 output remains as specified; however the REG0 dynamic performance (response time) is
degraded. See Table 8.1 for normal and low power mode supply current specifications. The REG0 mode
selection is controlled via the REGMOD bit in register REG0CN.
8.2.
When the USB Function Controller is used (see section
(USB0)” on page
REG0CN) indicates the current logic level of the VBUS signal. If enabled, a VBUS interrupt will be gener-
ated when the VBUS signal matches the polarity selected by the VBPOL bit in register REG0CN. The
VBUS interrupt is level-sensitive, and has no associated interrupt pending flag. The VBUS interrupt will be
active as long as the VBUS signal matches the polarity selected by VBPOL. See Table 8.1 for VBUS input
parameters.
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
page 100
–40 to +85 °C unless otherwise specified.
Input Voltage Range
Output Voltage (V
Output Current
VBUS Detection Input Low Voltage
VBUS Detection Input High Voltage
Bias Current
Dropout Voltage (V
Notes:
DD
1. Input range specified for regulation. When an external regulator is used, should be tied to
2. Output current is total regulator output, including any current required by the C8051F34x.
3. The minimum input voltage is 2.70 V or VDD + V
pin and can be used to power external devices. REG0 can be enabled/disabled by software using bit
Voltage Regulator (REG0)
Regulator Mode Selection
VBUS Detection
for details on selecting USB as a reset source
Parameter
2
DD
159), the VBUS signal should be connected to the VBUS pin. The VBSTAT bit (register
Table 8.1. Voltage Regulator Electrical Specifications
DO
1
)
2
)
3
C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D
Output Current = 1 to 100 mA
Normal Mode (REGMOD = ‘0’)
Low Power Mode (REGMOD = ‘1’)
Conditions
Rev. 1.3
DO
(max load), whichever is greater.
Section “16. Universal Serial Bus Controller
Section “11. Reset Sources” on
Min
2.7
3.0
3.0
Typ
3.3
65
35
1
V
DD
Max
5.25
100
111
3.6
1.0
61
.
mV/mA
Units
mA
µA
V
V
V
V
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