C8051F022 Silicon Laboratories Inc, C8051F022 Datasheet - Page 46
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C8051F022
Manufacturer Part Number
C8051F022
Description
IC 8051 MCU 64K FLASH 100TQFP
Manufacturer
Silicon Laboratories Inc
Series
C8051F02xr
Specifications of C8051F022
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, 8x10b; 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
5.2.3. Settling Time Requirements
When the ADC0 input configuration is changed (i.e., a different MUX or PGA selection is made), a minimum settling
(or tracking) time is required before an accurate conversion can be performed. This settling time is determined by the
ADC0 MUX resistance, the ADC0 sampling capacitance, any external source resistance, and the accuracy required
for the conversion. Figure 5.4 shows the equivalent ADC0 input circuits for both Differential and Single-ended
modes. Notice that the equivalent time constant for both input circuits is the same. The required settling time for a
given settling accuracy (SA) may be approximated by Equation 5.1. When measuring the Temperature Sensor output,
R
every conversion. For most applications, these three SAR clocks will meet the tracking requirements. See Table 5.1
on page 58 for absolute minimum settling/tracking 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 settling time in seconds
R
n is the ADC resolution in bits (12).
46
TOTAL
TOTAL
AIN0.x
AIN0.y
reduces to R
is the sum of the ADC0 MUX resistance and any external source resistance.
RC
Differential Mode
MUX Select
MUX Select
Input
= R
MUX
MUX
R
R
* C
. Note that in low-power tracking mode, three SAR clocks are used for tracking at the start of
MUX
MUX
SAMPLE
Equation 5.1. ADC0 Settling Time Requirements
= 5k
= 5k
Figure 5.4. ADC0 Equivalent Input Circuits
t
C
C
SAMPLE
SAMPLE
=
ln
= 10pF
= 10pF
------ -
SA
2
n
Rev. 1.4
R
TOTAL
AIN0.x
C
SAMPLE
Single-Ended Mode
RC
MUX Select
Input
= R
MUX
R
* C
MUX
SAMPLE
= 5k
C
SAMPLE
= 10pF