C8051F021-GQ Silicon Laboratories Inc, C8051F021-GQ Datasheet - Page 78

IC 8051 MCU 64K FLASH 64TQFP

C8051F021-GQ

Manufacturer Part Number
C8051F021-GQ
Description
IC 8051 MCU 64K FLASH 64TQFP
Manufacturer
Silicon Laboratories Inc
Series
C8051F02xr
Datasheets

Specifications of C8051F021-GQ

Program Memory Type
FLASH
Program Memory Size
64KB (64K x 8)
Package / Case
64-TQFP, 64-VQFP
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
32
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
Processor Series
C8051F0x
Core
8051
Data Bus Width
8 bit
Data Ram Size
4.25 KB
Interface Type
I2C/SMBus/SPI/UART
Maximum Clock Frequency
25 MHz
Number Of Programmable I/os
32
Number Of Timers
4
Operating Supply Voltage
2.7 V to 3.6 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
3rd Party Development Tools
PK51, CA51, A51, ULINK2
Development Tools By Supplier
C8051F020DK
Minimum Operating Temperature
- 40 C
On-chip Adc
8-ch x 8-bit or 8-ch x 12-bit
On-chip Dac
2-ch x 12-bit
No. Of I/o's
32
Ram Memory Size
4352Byte
Cpu Speed
25MHz
No. Of Timers
5
No. Of Pwm Channels
5
Rohs Compliant
Yes
Data Rom Size
64 KB
A/d Bit Size
12 bit
A/d Channels Available
8
Height
1.05 mm
Length
10 mm
Supply Voltage (max)
3.6 V
Supply Voltage (min)
2.7 V
Width
10 mm
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
336-1200 - DEV KIT FOR F020/F021/F022/F023
Eeprom Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
336-1201

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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

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