C8051F131R Silicon Labs, C8051F131R Datasheet - Page 94
C8051F131R
Manufacturer Part Number
C8051F131R
Description
8-bit Microcontrollers - MCU 128kB 100MIPS 8448B RAM
Manufacturer
Silicon Labs
Datasheet
1.C8051F133R.pdf
(350 pages)
Specifications of C8051F131R
Product Category
8-bit Microcontrollers - MCU
Core
8051
Data Bus Width
8 bit
Maximum Clock Frequency
100 MHz
Program Memory Size
128 KB
Data Ram Size
8.25 KB
On-chip Adc
Yes
Operating Supply Voltage
2.7 V to 3.6 V
Package / Case
TQFP-64
Mounting Style
SMD/SMT
A/d Bit Size
10 bit
A/d Channels Available
9
Data Rom Size
64 KB
Interface Type
I2C, SMBus, SPI, UART
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Number Of Programmable I/os
32
Number Of Timers
16 bit
Processor Series
C8051
Program Memory Type
Flash
Factory Pack Quantity
500
Supply Voltage - Max
3.6 V
Supply Voltage - Min
3 V
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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 ADC2 MUX resistance, the ADC2 sampling capacitance, any external source resis-
tance, and the accuracy required for the conversion. Figure 7.3 shows the equivalent ADC2 input circuit.
The required ADC2 settling time for a given settling accuracy (SA) may be approximated by Equation 7.1.
Note: An absolute minimum settling time of 800 ns required after any MUX selection. In low-power tracking
mode, three SAR2 clocks are used for tracking at the start of every conversion. For most applications,
these three SAR2 clocks will meet the tracking 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 (8).
94
TOTAL
AIN2.x
AIN2.y
is the sum of the ADC2 MUX resistance and any external source resistance.
RC
Differential Mode
MUX Select
MUX Select
Input
= R
MUX
Equation 7.1. ADC2 Settling Time Requirements
R
R
* C
MUX
MUX
SAMPLE
= 5k
Figure 7.3. ADC2 Equivalent Input Circuit
= 5k
Note: When the PGA gain is set to 0.5, C
t
C
C
=
SAMPLE
SAMPLE
ln
= 5pF
= 5pF
------ -
SA
2
n
Rev. 1.4
R
TOTAL
AIN2.x
C
SAMPLE
Single-Ended Mode
SAMPLE
RC
MUX Select
Input
= R
= 3pF
MUX
R
* C
MUX
SAMPLE
= 5k
C
SAMPLE
= 5pF
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