TOOLSTICK560DC Silicon Laboratories Inc, TOOLSTICK560DC Datasheet - Page 79

• Manufacturer Part Number: TOOLSTICK560DC
• Description: DAUGHTER CARD TOOLSTICK F560
• Manufacturer: Silicon Laboratories Inc
• Series: ToolStickr
• Type: MCUr

Specifications of TOOLSTICK560DC

• Contents: Daughter Card
• Processor To Be Evaluated: C8051F55x, C8051F56x, C8051F57x
• Interface Type: USB
• Operating Supply Voltage: 2.7 V to 3.6 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: C8051F55x, C8051F56x, C8051F57x
• For Use With: 336-1345 - TOOLSTICK BASE ADAPTER336-1182 - ADAPTER USB DEBUG FOR C8051FXXX
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1719

9. Voltage Regulator (REG0)
C8051F55x/56x/57x devices include an on-chip low dropout voltage regulator (REG0). The input to REG0
at the V
enabled, the output of REG0 appears on the V
power external devices. On reset, REG0 is enabled and can be disabled by software.
The Voltage regulator can generate an interrupt (if enabled by EREG0, EIE2.0) that is triggered whenever
the V
flag and the recommended procedure to use it is as follows:
1. Wait enough time to ensure the V
2. Enable the dropout interrupt (EREG0, EIE2.0) and select the proper priority (PREG0, EIP2.0)
3. If triggered, inside the interrupt disable it (clear EREG0, EIE2.0), execute all procedures necessary to
4. In the main application, now running in the safe mode, regularly checks the DROPOUT bit
The input (V
tor (4.7 µF + 0.1 µF) to ground as shown in Figure 9.1 below. This capacitor will eliminate power spikes
and provide any immediate power required by the microcontroller. The settling time associated with the
voltage regulator is shown in Table 5.8 on page 43.
If the internal voltage regulator is not used, the V
protect your application (put it in a safe mode and leave the interrupt now disabled.
(REG0CN.0). Once it is cleared by the regulator hardware the application can enable the interrupt
again (EREG0, EIE1.6) and return to the normal mode operation.
REGIN
REGIN
input voltage drops below the dropout threshold voltage. This dropout interrupt has no pending
REGIN
Figure 9.1. External Capacitors for Voltage Regulator Input/Output—
pin can be as high as 5.25 V. The output can be selected by software to 2.1 V or 2.6 V. When
) and output (V
REG0
V
DD
DD
) of the voltage regulator should both be bypassed with a large capaci-
4.7 µF
4.7 µF
REGIN
Regulator Enabled
input voltage is stable
DD
REGIN
Rev. 1.1
pin, powers the microcontroller core, and can be used to
input should be tied to V
.1 µF
.1 µF
C8051F55x/56x/57x
V
V
REGIN
DD
DD
, as shown in Figure 9.2.
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