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SPC560B64L5 bảng dữ liệu(PDF) 101 Page - STMicroelectronics

tên linh kiện SPC560B64L5
Giải thích chi tiết về linh kiện  32-bit MCU family built on the Power Architecture® for automotive body electronics applications
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SPC560B54/6x
Electrical characteristics
Doc ID 15131 Rev 6
101/134
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
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)
RADSampling 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
ΔV < 0.5 LSB
1
2
τ1 < (RSW + RAD) CS << tS
τ2 = RL (CS + CP1 + CP2)



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