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SPC564L54L5 bảng dữ liệu(PDF) 116 Page - STMicroelectronics

tên linh kiện SPC564L54L5
Giải thích chi tiết về linh kiện  32-bit Power Architecture® microcontroller for automotive SIL3/ASILD chassis and safety applications
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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SPC564L54L5 bảng dữ liệu(HTML) 116 Page - STMicroelectronics

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Electrical characteristics
SPC56XL60/54
116/160
Doc ID 15457 Rev 8
Equation 4
Equation 4 generates a constraint for external network design, in particular on resistive
path. Internal switch resistances (RSW and RAD) can be neglected with respect to external
resistances.
Figure 9.
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 9): A charge sharing phenomenon is installed when the
sampling phase is started (A/D switch close).
VA
RS RF
+
REQ
---------------------
•
1
2
---LSB
<
RF
CF
RS
RL
RSW1
CP2
VDD
Sampling
Source
Filter
Current Limiter
EXTERNAL CIRCUIT
INTERNAL CIRCUIT SCHEME
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
CP1
RAD
Channel
Selection
VA
CS



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