C8051F930DK Silicon Laboratories Inc, C8051F930DK Datasheet - Page 191
C8051F930DK
Manufacturer Part Number
C8051F930DK
Description
KIT DEV C8051F920,F921,F930,F931
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Specifications of C8051F930DK
Contents
Target Board, Power Adapter, USB Debug Adapter, Cables, Batteries, and Software
Processor To Be Evaluated
C8051F930
Processor Series
C8051F9xx
Data Bus Width
8 bit
Interface Type
I2C, UART, SPI
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Operating Supply Voltage
0.9 V to 3.6 V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
C8051F920, F921, F930, F931
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1473
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
C8051F930DK
Manufacturer:
Silicon Labs
Quantity:
135
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When the RC oscillator is first enabled, the external oscillator valid detector allows software to determine
when oscillation has stabilized. The recommended procedure for starting the RC oscillator is:
19.3.3. External Capacitor Mode
If a capacitor is used as the external oscillator, the circuit should be configured as shown in Figure 19.1,
Option 3. The capacitor should be added to XTAL2, and XTAL2 should be configured for analog I/O with
the digital output drivers disabled. XTAL1 is not affected in RC mode.
The capacitor should be no greater than 100 pF; however, for very small capacitors, the total capacitance
may be dominated by parasitic capacitance in the PCB layout. The oscillation frequency and the required
External Oscillator Frequency Control value (XFCN) in the OSCXCN Register can be determined by the
following equation:
Below is an example of selecting the capacitor and finding the frequency of oscillation Assume V
and f = 150 kHz:
Since a frequency of roughly 150 kHz is desired, select the K Factor from Table 19.2 as KF = 22:
Therefore, the XFCN value to use in this example is 011 and C is approximately 50 pF.
The recommended startup procedure for C mode is the same as RC mode.
0.150 MHz
C
0.150 MHz
f
f
=
where
f = frequency of clock in MHz
V
=
=
DD
---------------------------------------------- -
0.150 MHz 3.0 V
C
-------------------- -
C V
-------------------- -
C V
1. Configure XTAL2 for analog I/O and disable the digital output drivers.
2. Configure and enable the external oscillator.
3. Poll for XTLVLD > 1.
4. Switch the system clock to the external oscillator.
= power supply voltage in Volts
=
KF
KF
48.8 pF
=
DD
DD
=
22
---------------------- -
C 3.0 V
-----------------
C 3.0
KF
22
R = pull-up resistor value in k
C = capacitor value on the XTAL2 pin in pF
Rev. 1.1
C8051F93x-C8051F92x
DD
= 3.0 V
191
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