C8051F064EK Silicon Laboratories Inc, C8051F064EK Datasheet - Page 91
C8051F064EK
Manufacturer Part Number
C8051F064EK
Description
KIT EVAL FOR C8051F064
Manufacturer
Silicon Laboratories Inc
Type
MCUr
Specifications of C8051F064EK
Contents
Evaluation Board, Power Supply, USB Cables, Adapter and Documentation
Processor To Be Evaluated
C8051F06x
Interface Type
USB
Silicon Manufacturer
Silicon Labs
Core Architecture
8051
Silicon Core Number
C8051F064
Silicon Family Name
C8051F06x
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
C8051F064
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1219
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7.2.3. Settling Time Requirements
A minimum tracking time is required before an accurate conversion can be performed. This tracking time is
determined by the AMUX2 resistance, the ADC2 sampling capacitance, any external source resistance,
and the accuracy required for the conversion. Note that in low-power tracking mode, three SAR clocks are
used for tracking at the start of every conversion. For most applications, these three SAR clocks will meet
the minimum tracking time requirements.
Figure 7.4 shows the equivalent ADC2 input circuits for both Differential and Single-ended modes. Notice
that the equivalent time constant for both input circuits is the same. The required ADC2 settling time for a
given settling accuracy (SA) may be approximated by Equation 7.1. When measuring the Temperature
Sensor output, R
Where:
SA is the settling accuracy, given as a fraction of an LSB (for example, 0.25 to settle within 1/4 LSB)
t is the required settling time in seconds
R
n is the ADC resolution in bits (10).
TOTAL
is the sum of the AMUX2 resistance and any external source resistance.
P1.x
P1.y
TOTAL
RC
Differential Mode
MUX Select
MUX Select
Input
= R
reduces to R
MUX
R
R
* C
MUX
MUX
Equation 7.1. ADC2 Settling Time Requirements
SAMPLE
= 5k
= 5k
Figure 7.4. ADC2 Equivalent Input Circuits
t
=
MUX
C
C
ln
SAMPLE
SAMPLE
. See Table 7.1 for ADC2 minimum settling time requirements.
------ -
SA
2
= 5pF
= 5pF
n
Rev. 1.2
R
TOTAL
C8051F060/1/2/3/4/5/6/7
C
P1.x
SAMPLE
Single-Ended Mode
RC
MUX Select
Input
= R
MUX
R
* C
MUX
SAMPLE
= 5k
C
SAMPLE
= 5pF
91
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