参数资料
型号: SPC5604PGF0MLL6
厂商: Freescale Semiconductor
文件页数: 73/104页
文件大小: 0K
描述: IC MCU 32BIT 512KB FLASH 100LQFP
标准包装: 90
系列: MPC56xx Qorivva
核心处理器: e200z0h
芯体尺寸: 32-位
速度: 64MHz
连通性: CAN,FlexRay,LIN,SPI,UART/USART
外围设备: DMA,POR,PWM,WDT
输入/输出数: 68
程序存储器容量: 512KB(512K x 8)
程序存储器类型: 闪存
EEPROM 大小: 64K x 8
RAM 容量: 40K x 8
电压 - 电源 (Vcc/Vdd): 3 V ~ 5.5 V
数据转换器: A/D 30x10b
振荡器型: 内部
工作温度: -40°C ~ 125°C
封装/外壳: 100-LQFP
包装: 托盘
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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