参数资料
型号: PPC5605BCLQ64
厂商: Freescale Semiconductor
文件页数: 87/112页
文件大小: 0K
描述: MCU 32BIT 768K 64MHZ
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,I²C,LIN,SCI,SPI
外围设备: POR,PWM,WDT
输入/输出数: 121
程序存储器容量: 768KB(768K x 8)
程序存储器类型: 闪存
EEPROM 大小: 4K x 16
RAM 容量: 64K x 8
电压 - 电源 (Vcc/Vdd): 3 V ~ 3.6 V
数据转换器: A/D 15x10b,5x12b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 144-LQFP
包装: 托盘
MPC5607B Microcontroller Data Sheet, Rev. 7
Electrical characteristics
Freescale Semiconductor
76
Figure 18. Input equivalent circuit (extended channels)
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 17): A charge sharing phenomenon
is installed when the sampling phase is started (A/D switch close).
Figure 19. Transient behavior during sampling phase
In particular two different transient periods can be distinguished:
1.
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
RF
CF
RS
RL
RSW1
CP3
CS
VDD
Sampling
Source
Filter
Current Limiter
EXTERNAL CIRCUIT
INTERNAL CIRCUIT SCHEME
RS
Source Impedance
RF
Filter Resistance
CF
Filter Capacitance
RL
Current Limiter Resistance
RSW Channel Selection Switch Impedance (two contributions RSW1 and RSW2)
RAD Sampling Switch Impedance
CP
Pin Capacitance (three contributions, CP1, CP2 and CP3)
CS
Sampling Capacitance
CP1
RAD
Channel
Selection
VA
CP2
Extended
RSW2
Switch
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)
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