參數(shù)資料
型號(hào)： SPC5604PGF0MLQ6
廠商： Freescale Semiconductor
文件頁(yè)數(shù)： 73/104頁(yè)
文件大?。?/td> 0K
描述： IC MCU 32BIT 512KB FLASH 144LQFP
標(biāo)準(zhǔn)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(shè)備： DMA，POR，PWM，WDT
輸入/輸出數(shù)： 108
程序存儲(chǔ)器容量： 512KB（512K x 8）
程序存儲(chǔ)器類(lèi)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(pán)
MPC5604P Microcontroller Data Sheet, Rev. 8
Freescale
70
Figure 16. Transient behavior during sampling phase
In particular two different transient periods can be distinguished:
A first and quick charge transfer from the internal capacitance CP1 and CP2 to the sampling capacitance CS occurs (CS
is supposed initially completely discharged): considering a worst case (since the time constant in reality would be
faster) in which CP2 is reported in parallel to CP1 (call CP = CP1 + CP2), the two capacitances CP and CS are in series,
and the time constant is
Eqn. 5
Equation 5 can again be simplified considering only CS as an additional worst condition. In reality, the transient is
faster, but the A/D converter circuitry has been designed to be robust also in the very worst case: the sampling time TS
is always much longer than the internal time constant:
Eqn. 6
The charge of CP1 and CP2 is redistributed also on CS, determining a new value of the voltage VA1 on the capacitance
according to Equation 7:
Eqn. 7
A second charge transfer involves also CF (that is typically bigger than the on-chip capacitance) through the resistance
RL: again considering the worst case in which CP2 and CS were in parallel to CP1 (since the time constant in reality
would be faster), the time constant is:
Eqn. 8
VA
VA1
VA2
t
TS
VCS
Voltage Transient on CS
V <0.5 LSB
1
2
1 < (RSW + RAD) CS << TS
2 = RL (CS + CP1 + CP2)
1 RSW RAD
+
=
CP CS
CP CS
+
---------------------
1 RSW RAD
+
CS TS
VA1 CS CP1 CP2
++
VA CP1 CP2
+
=
2 RL
CS CP1 CP2
++
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