C8051F996DK Silicon Laboratories Inc, C8051F996DK Datasheet - Page 87
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C8051F996DK
Manufacturer Part Number
C8051F996DK
Description
KIT DEV FOR C8051F996
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Datasheets
1.C8051F996DK.pdf
(24 pages)
2.C8051F996DK.pdf
(2 pages)
3.C8051F996DK.pdf
(4 pages)
4.C8051F996DK.pdf
(322 pages)
Specifications of C8051F996DK
Contents
Board, Batteries, Cables, CDs, Debug Adapter, Documentation, Power Adapter
Processor To Be Evaluated
C8051F996
Processor Series
C8051F98x
Interface Type
USB
Operating Supply Voltage
3 V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
C8051F996
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1963
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C8051F99x-C8051F98x
5.10. External Voltage Reference
To use an external voltage reference, REFSL[1:0] should be set to 00. Bypass capacitors should be added
as recommended by the manufacturer of the external voltage reference. If the manufacturer does not pro-
vide recommendations, a 4.7uF in parallel with a 0.1uF capacitor is recommended.
5.11. Internal Voltage Reference
For applications requiring the maximum number of port I/O pins, or very short VREF turn-on time, the
1.65 V high-speed reference will be the best internal reference option to choose. The high speed internal
reference is selected by setting REFSL[1:0] to 11. When selected, the high speed internal reference will be
automatically enabled/disabled on an as-needed basis by ADC0.
For applications with a non-varying power supply voltage, using the power supply as the voltage reference
can provide ADC0 with added dynamic range at the cost of reduced power supply noise rejection. To use
the 1.8 to 3.6 V power supply voltage (V
) or the 1.8 V regulated digital supply voltage as the reference
DD
source, REFSL[1:0] should be set to 01 or 10, respectively.
5.12. Analog Ground Reference
To prevent ground noise generated by switching digital logic from affecting sensitive analog
measurements, a separate analog ground reference option is available. When enabled, the ground
reference for ADC0 during both the tracking/sampling and the conversion periods is taken from the
P0.1/AGND pin. Any external sensors sampled by ADC0 should be referenced to the P0.1/AGND pin. This
pin should be connected to the ground terminal of any external sensors sampled by ADC0. If an external
voltage reference is used, the P0.1/AGND pin should be connected to the ground of the external reference
and its associated decoupling capacitor. The separate analog ground reference option is enabled by
setting REFGND to 1. Note that when sampling the internal temperature sensor, the internal chip ground is
always used for the sampling operation, regardless of the setting of the REFGND bit. Similarly, whenever
the internal 1.65 V high-speed reference is selected, the internal chip ground is always used during the
conversion period, regardless of the setting of the REFGND bit.
5.13. Temperature Sensor Enable
The TEMPE bit in register REF0CN enables/disables the temperature sensor. While disabled, the
temperature sensor defaults to a high impedance state and any ADC0 measurements performed on the
sensor result in meaningless data. See Section “5.8. Temperature Sensor” on page 83 for details on
temperature sensor characteristics when it is enabled.
Rev. 1.0
87
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