In fact a current sink contributor is represented by the charge sharing effe" />
參數(shù)資料
型號: SPC5604PGF0MLQ6
廠商: Freescale Semiconductor
文件頁數(shù): 71/104頁
文件大?。?/td> 0K
描述: IC MCU 32BIT 512KB FLASH 144LQFP
標準包裝: 60
系列: MPC56xx Qorivva
核心處理器: e200z0h
芯體尺寸: 32-位
速度: 64MHz
連通性: CAN,F(xiàn)lexRay,LIN,SPI,UART/USART
外圍設備: DMA,POR,PWM,WDT
輸入/輸出數(shù): 108
程序存儲器容量: 512KB(512K x 8)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 64K x 8
RAM 容量: 40K x 8
電壓 - 電源 (Vcc/Vdd): 3 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 30x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 125°C
封裝/外殼: 144-LQFP
包裝: 托盤
MPC5604P Microcontroller Data Sheet, Rev. 8
Freescale
69
In fact a current sink contributor is represented by the charge sharing effects with the sampling capacitance: CS and CP2 being
substantially two switched capacitances, with a frequency equal to the ADC conversion rate, it can be seen as a resistive path
to ground. For instance, assuming a conversion rate of 1 MHz, with CS+CP2 equal to 3 pF, a resistance of 330 k is obtained
(REQ = 1 / (fc × (CS+CP2)), where fc represents the conversion rate at the considered channel). To minimize the error induced
by the voltage partitioning between this resistance (sampled voltage on CS+CP2) and the sum of RS + RF, the external circuit
must be designed to respect the Equation 4:
Eqn. 4
Equation 4 generates a constraint for external network design, in particular on resistive path.
Figure 15. Input equivalent circuit
A second aspect involving the capacitance network shall be considered. Assuming the three capacitances CF, CP1 and CP2 are
initially charged at the source voltage VA (refer to the equivalent circuit reported in Figure 15): A charge sharing phenomenon
is installed when the sampling phase is started (A/D switch closed).
VA
RS RF
+
REQ
---------------------
1
2
---LSB
RF
CF
RS
RL
RSW1
CP2
CS
VDD
Sampling
Source
Filter
Current Limiter
EXTERNAL CIRCUIT
INTERNAL CIRCUIT SCHEME
CP1
RAD
Channel
Selection
VA
RS: Source impedance
RF: Filter resistance
CF: Filter capacitance
RL: Current limiter resistance
RSW1: Channel selection switch impedance
RAD: Sampling switch impedance
CP: Pin capacitance (two contributions, CP1 and CP2)
CS: Sampling capacitance
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