TRK-USB-MPC5643L Freescale Semiconductor, TRK-USB-MPC5643L Datasheet - Page 95
![no-image](/images/manufacturer_photos/0/2/262/freescale_semiconductor_sml.jpg)
TRK-USB-MPC5643L
Manufacturer Part Number
TRK-USB-MPC5643L
Description
Development Boards & Kits - Other Processors StarTrakMiniUSG MPC5643L
Manufacturer
Freescale Semiconductor
Datasheet
1.SPC5643LF2MLQ8.pdf
(136 pages)
Specifications of TRK-USB-MPC5643L
Rohs
yes
Product
Starter Kits
Tool Is For Evaluation Of
MPC5643L
Core
Five Stage Pipeline
Interface Type
LIN, DSPI
Operating Supply Voltage
3 V to 3.6 V
Data Bus Width
32 bit, 64 bit
Description/function
Starter Kit for MPC5643L
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 40 C
For Use With
MPC5643L
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Equation 4
and R
A second aspect involving the capacitance network shall be considered. Assuming the three capacitances C
initially charged at the source voltage V
installed when the sampling phase is started (A/D switch close).
In particular two different transient periods can be distinguished:
Freescale Semiconductor
•
AD
) can be neglected with respect to external resistances.
A first and quick charge transfer from the internal capacitance C
is supposed initially completely discharged): considering a worst case (since the time constant in reality would be
generates a constraint for external network design, in particular on resistive path. Internal switch resistances (R
V
A
Source
V
V
V
V
CS
A
A2
A1
R
R
C
R
R
R
C
C
R
S
F
F
L
SW1
AD
P
S
S
Figure 9. Transient Behavior during Sampling Phase
1
EXTERNAL CIRCUIT
Source Impedance
Filter Resistance
Filter Capacitance
Current Limiter Resistance
Channel Selection Switch Impedance
Sampling Switch Impedance
Pin Capacitance (two contributions, C
Sampling Capacitance
Voltage Transient on C
MPC5643L Microcontroller Data Sheet, Rev. 8.1
A
(refer to the equivalent circuit reported in
R
Filter
F
Figure 8. Input Equivalent Circuit
2
C
F
Current Limiter
R
L
S
T
S
P1
and C
V <0.5 LSB
t
C
P1
P2
)
P1
1
< (R
2
and C
= R
V
INTERNAL CIRCUIT SCHEME
DD
SW
L
(C
P2
+ R
S
Figure
to the sampling capacitance C
Selection
+ C
Channel
R
AD
P1
SW1
) C
C
+ C
P2
8): A charge sharing phenomenon is
S
P2
<< T
)
Sampling
S
R
AD
Electrical characteristics
C
S
F
, C
P1
S
and C
occurs (C
P2
are
SW
95
S
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