C8051F351 Silicon Laboratories Inc, C8051F351 Datasheet - Page 41
C8051F351
Manufacturer Part Number
C8051F351
Description
IC 8051 MCU 8K FLASH 28MLP
Manufacturer
Silicon Laboratories Inc
Series
C8051F35xr
Specifications of C8051F351
Core Processor
8051
Core Size
8-Bit
Speed
50MHz
Connectivity
SMBus (2-Wire/I²C), SPI, UART/USART
Peripherals
POR, PWM, Temp Sensor, WDT
Number Of I /o
17
Program Memory Size
8KB (8K x 8)
Program Memory Type
FLASH
Ram Size
768 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 3.6 V
Data Converters
A/D 8x24b; D/A 2x8b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Available stocks
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Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
C8051F351-GM
Manufacturer:
SiliconL
Quantity:
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5.1.3. Modulator Clock
The ADC0CLK register (Figure 5.8) holds the Modulator Clock (MDCLK) divisor value. The modulator
clock determines the switching frequency for the ADC sampling capacitors. Optimal performance will be
achieved when the MDCLK frequency is equal to 2.4576 MHz. The modulator samples the input at a rate
of MDCLK / 128.
5.1.4. Decimation Ratio
The decimation ratio of the ADC filters is selected by the DECI[10:0] bits in the ADC0DECH and
ADC0DECL registers (Figure 5.9 and Figure 5.10, respectively). The decimation ratio is equal to 1 +
DECI[10:0]. The decimation ratio determines how many modulator samples are used to generate a single
output word. The ADC output word rate is equal to the modulator sampling rate divided by the decimation
ratio. For more information on how the ADC output word rate is derived, see Figure 5.8 and Figure 5.10.
Higher decimation ratios will produce lower-noise results over a longer conversion period. The minimum
decimation ratio is 20. When using the fast filter output, the decimation ratio must be set to a multi-
ple of 8.
Channel
Channel
AIN+
AIN-
Figure 5.2. ADC0 Buffer Control
Bypass Buffer
Bypass Buffer
High Buffer+
Low Buffer+
High Buffer-
Low Buffer-
Rev. 0.4
AD0BPHE
AD0BNHE
AD0BPLE
AD0BPS1
AD0BPS0
AD0BNLE
AD0BNS1
AD0BNS0
To PGA
To PGA
C8051F350/1/2/3
41
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