參數(shù)資料
型號: C8051F304-GS
廠商: Silicon Laboratories Inc
文件頁數(shù): 115/178頁
文件大小: 0K
描述: IC 8051 MCU 4K FLASH 14-SOIC
產(chǎn)品培訓模塊: Serial Communication Overview
標準包裝: 56
系列: C8051F30x
核心處理器: 8051
芯體尺寸: 8-位
速度: 25MHz
連通性: SMBus(2 線/I²C),UART/USART
外圍設備: POR,PWM,WDT
輸入/輸出數(shù): 8
程序存儲器容量: 4KB(4K x 8)
程序存儲器類型: 閃存
RAM 容量: 256 x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 3.6 V
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 14-SOIC(0.154",3.90mm 寬)
包裝: 管件
配用: 336-1444-ND - ADAPTER PROGRAM TOOLSTICK F300
其它名稱: 336-1539-5
Rev. 2.9
41
C8051F300/1/2/3/4/5
5.3.3. Settling Time Requirements
When the ADC0 input configuration is changed (i.e., a different AMUX0 or PGA selection is made), a mini-
mum tracking time is required before an accurate conversion can be performed. This tracking time is deter-
mined by the AMUX0 resistance, the ADC0 sampling capacitance, any external source resistance, and the
accuracy required for the conversion. Note that in low-power tracking mode, three SAR clocks are used for
tracking at the start of every conversion. For most applications, these three SAR clocks will meet the mini-
mum tracking time requirements.
Figure 5.5 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 ADC0 settling time for a
given settling accuracy (SA) may be approximated by Equation 5.1. When measuring the Temperature
Sensor output or VDD with respect to GND, RTOTAL reduces to RMUX. See Table 5.1 for ADC0 minimum
settling time (track/hold time) requirements.
t
2
n
SA
-------
R
TOTALCSAMPLE
ln
=
Equation 5.1. ADC0 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 settling time in seconds
RTOTAL is the sum of the AMUX0 resistance and any external source resistance.
n is the ADC resolution in bits (8).
R
MUX = 5k
RC
Input= RMUX * CSAMPLE
R
MUX = 5k
C
SAMPLE = 5pF
C
SAMPLE = 5pF
MUX Select
Differential Mode
P0.x
P0.y
R
MUX = 5k
C
SAMPLE = 5pF
RC
Input= RMUX * CSAMPLE
MUX Select
Single-Ended Mode
P0.x
Note: When the PGA gain is set to 0.5, C
SAMPLE = 3pF
Figure 5.5. ADC0 Equivalent Input Circuits
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