C8051F526-IMR Silicon Labs, C8051F526-IMR Datasheet - Page 74

• Manufacturer Part Number: C8051F526-IMR
• Description: 8-bit Microcontrollers - MCU 2KB 12ADC 125C LIN 10Pin MCU
• Manufacturer: Silicon Labs

Specifications of C8051F526-IMR

• Product Category: 8-bit Microcontrollers - MCU
• Rohs: yes
• Core: 8051
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 25 MHz
• Program Memory Size: 2 KB
• Data Ram Size: 256 B
• On-chip Adc: Yes
• Package / Case: DFN-10
• Mounting Style: SMD/SMT
• A/d Bit Size: 12 bit
• A/d Channels Available: 6
• Interface Type: SPI, UART
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 6
• Number Of Timers: 3
• On-chip Dac: No
• Processor Series: C8051
• Program Memory Type: Flash
• Factory Pack Quantity: 1500
• Supply Voltage - Max: 2.7 V, 5.25 V
• Supply Voltage - Min: 2 V, 2.7 V

C8051F52x/F53x
6. Voltage Regulator (REG0)
C8051F52x/F52xA/F53x/F53xAdevices include an on-chip low dropout voltage regulator (REG0). The
input to REG0 at the V
or 2.6 V. When enabled, the output of REG0 appears on the V
can be used to power external devices. On reset, REG0 is enabled and can be disabled by software.
The input (V
tor (4.7 µF + 0.1 µF) to ground. These capacitors are required for regulator stability, and will eliminate
power spikes and provide any immediate power required by the microcontroller. The settling time associ-
ated with the voltage regulator is shown in Table 2.6 on page 30.
Important Note: The bypass capacitors are required for the stability of the voltage regulator.
The voltage regulator can also generate an interrupt (if enabled by EREG0, EIE1.6) that is triggered when-
ever the V
interrupt has no pending flag. The recommended procedure to use the interrupt is as follows:
1. Wait enough time to ensure the V
2. Enable the dropout interrupt (EREG0, EIE1.6) and select the proper priority (PREG0, EIP1.6).
3. If triggered, disable the interrupt in the Interrupt Service Routine (clear EREG0, EIE1.6) and execute all
4. The main application, now running in safe mode, should regularly check the DROPOUT bit
74
necessary procedures to put the system in “safe mode,” leaving the interrupt disabled.
(REG0CN.0). Once it is cleared by the regulator hardware, the application can re-enable the interrupt
(EREG0, EIE1.6) and return to normal mode operation.
REGIN
REGIN
Figure 6.1. External Capacitors for Voltage Regulator Input/Output
input voltage drops below the dropout threshold (see Table 2.6 on page 30). This dropout
) and output (V
REGIN
REG0
V
DD
pin can be as high as 5.25 V. The output can be selected by software to 2.1 V
4.7 µF
4.7 µF
DD
) of the voltage regulator should both be bypassed with a large capaci-
REGIN
input voltage is stable.
Rev. 1.4
.1 µF
.1 µF
DD
pin, powers the microcontroller core, and
VREGIN
V
DD