C8051F020 Silicon Laboratories Inc, C8051F020 Datasheet - Page 78
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C8051F020
Manufacturer Part Number
C8051F020
Description
IC 8051 MCU 64K FLASH 100TQFP
Manufacturer
Silicon Laboratories Inc
Series
C8051F02xr
Specifications of C8051F020
Core Processor
8051
Core Size
8-Bit
Speed
25MHz
Connectivity
EBI/EMI, SMBus (2-Wire/I²C), SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Number Of I /o
64
Program Memory Size
64KB (64K x 8)
Program Memory Type
FLASH
Ram Size
4.25K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 3.6 V
Data Converters
A/D 8x8b, 8x12b; D/A 2x12b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
100-TQFP, 100-VQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
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C8051F020/1/2/3
7.2.3. Settling Time Requirements
When the ADC1 input configuration is changed (i.e., a different MUX or PGA selection), a minimum settling (or
tracking) time is required before an accurate conversion can be performed. This settling time is determined by the
ADC1 MUX resistance, the ADC1 sampling capacitance, any external source resistance, and the accuracy required
for the conversion. Figure 7.3 shows the equivalent ADC1 input circuit. The required ADC1 settling time for a given
settling accuracy (SA) may be approximated by Equation 7.1. Note that in low-power tracking mode, three SAR1
clocks are used for tracking at the start of every conversion. For most applications, these three SAR1 clocks will meet
the tracking requirements. See Table 7.1 for absolute minimum settling time requirements.
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 tracking time in seconds
R
n is the ADC resolution in bits (8).
78
TOTAL
is the sum of the ADC1 MUX resistance and any external source resistance.
Equation 7.1. ADC1 Settling Time Requirements
Figure 7.3. ADC1 Equivalent Input Circuit
AIN1.x
t
=
RC
ln
MUX Select
Input
= R
------ -
SA
2
n
MUX
Rev. 1.4
R
* C
MUX
R
SAMPLE
TOTAL
= 5k
C
SAMPLE
C
SAMPLE
= 10pF