SPC5604PEF0MLQ6 Freescale Semiconductor, SPC5604PEF0MLQ6 Datasheet - Page 68
SPC5604PEF0MLQ6
Manufacturer Part Number
SPC5604PEF0MLQ6
Description
IC MCU 32BIT 512KB FLASH 144LQFP
Manufacturer
Freescale Semiconductor
Series
MPC56xx Qorivvar
Datasheet
1.SPC5604PEF0MLL6.pdf
(99 pages)
Specifications of SPC5604PEF0MLQ6
Core Processor
e200z0h
Core Size
32-Bit
Speed
64MHz
Connectivity
CAN, FlexRay, LIN, SPI, UART/USART
Peripherals
DMA, POR, PWM, WDT
Number Of I /o
108
Program Memory Size
512KB (512K x 8)
Program Memory Type
FLASH
Eeprom Size
64K x 8
Ram Size
40K x 8
Voltage - Supply (vcc/vdd)
3 V ~ 5.5 V
Data Converters
A/D 30x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 125°C
Package / Case
144-LQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
SPC5604PEF0MLQ6
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
Part Number:
SPC5604PEF0MLQ6
Manufacturer:
FREESCALE
Quantity:
20 000
The two transients above are not influenced by the voltage source that, due to the presence of the R
provide the extra charge to compensate the voltage drop on C
the filter is very high with respect to the sampling time (T
Calling f
according to the Nyquist theorem the conversion rate f
than or at least equal to twice the conversion period (T
which is just a portion of it, even when fixed channel continuous conversion mode is selected (fastest conversion rate at a
specific channel): in conclusion it is evident that the time constant of the filter R
sampling time T
sampling switch is closed.
The considerations above lead to impose new constraints on the external circuit, to reduce the accuracy error due to the voltage
drop on C
voltage on C
68
0
In this case, the time constant depends on the external circuit: in particular imposing that the transient is completed
well before the end of sampling time T
Of course, R
impedance) and R
(at the end of the charge transfer transient) will be much higher than V
balance assuming now C
S
the bandwidth of the source signal (and as a consequence the cut-off frequency of the anti-aliasing filter, f
; from the two charge balance equations above, it is simple to derive
S
:
S
, so the charge level on C
L
shall be sized also according to the current limitation constraints, in combination with R
Anti-Aliasing Filter (f
Analog Source Bandwidth (V
V A2
F
(filter resistance). Being C
S
Figure 17. Spectral representation of input signal
C S C P1 C P2 C F
already charged at V
f
f
0
F
+
MPC5604P Microcontroller Data Sheet, Rev. 7
10 2
F
= RC Filter pole)
S
Noise
cannot be modified by the analog signal source during the time in which the
+
S
=
f
f
A
, a constraints on R
)
10 R L
+
C
C
must be at least 2f
). Again the conversion period T
F
A1
definitively bigger than C
S
):
). The filter is typically designed to act as anti-aliasing.
=
C S
Sampled Signal Spectrum (f
S
V A C F
T
f
2 f
with respect to the ideal source V
F
C
+
f
0
2 R
f
C P1
0
(Anti-aliasing Filtering Condition)
L
C
(Nyquist)
F
sizing is obtained:
C
f
+
0
F
+
0
V A1
(Conversion Rate vs. Filter Pole)
; it means that the constant time of the filter is greater
C P2
Equation 11
A1
F
C P1 C P2
C
.
T S
P1
Equation 10
C
F
= conversion Rate)
is definitively much higher than the
, C
+
f
C
C
P2
is longer than the sampling time T
and C
between the ideal and real sampled
+
C S
must be respected (charge
A
S
, then the final voltage V
; the time constant R
F
f
C
Freescale Semiconductor
F
filter, is not able to
S
(source
F
Eqn. 10
),
Eqn. 9
F
C
F
A2
of
S
,