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SPC560P54x bảng dữ liệu(PDF) 77 Page - STMicroelectronics

tên linh kiện SPC560P54x
Giải thích chi tiết về linh kiện  32-bit Power Architecture® based MCU with 1088KB Flash memory and 80KB RAM for automotive chassis and safety applications
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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SPC560P54x bảng dữ liệu(HTML) 77 Page - STMicroelectronics

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SPC56xP54x, SPC56xP60x
Electrical characteristics
104
Figure 17. 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 16): A charge sharing phenomenon is installed when
the sampling phase is started (A/D switch close).
Figure 18. Transient behavior during sampling phase
RF
CF
RS
RL
RSW1
CP3
CS
VDD
Sampling
Source
Filter
Current Limiter
EXTERNAL CIRCUIT
INTERNAL CIRCUIT SCHEME
CP1
RAD
Channel
Selection
VA
CP2
Extended
RSW2
Switch
RS: Source impedance
RF: Filter resistance
CF: Filter capacitance
RL: Current limiter resistance
RSW1: Channel selection switch impedance (two contributions, RSW1 and RSW2)
RAD: Sampling switch impedance
CP: Pin capacitance (two contributions, CP1, CP2 and CP3)
CS: Sampling capacitance
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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