ST10F276-6QR3 STMicroelectronics, ST10F276-6QR3 Datasheet - Page 190

• Manufacturer Part Number: ST10F276-6QR3
• Description: MCU 16BIT 832K FLASH 144-PQFP
• Manufacturer: STMicroelectronics
• Series: ST10r

Specifications of ST10F276-6QR3

• Core Processor: ST10
• Core Size: 16-Bit
• Speed: 64MHz
• Connectivity: ASC, CAN, EBI/EMI, I²C, SSC, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 111
• Program Memory Size: 832KB (832K x 8)
• Program Memory Type: FLASH
• Ram Size: 68K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 24x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 144-MQFP, 144-PQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

Electrical characteristics
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1.
2.
The two transients above are not influenced by the voltage source that, due to the presence
of the R
with respect to the ideal source V
respect to the sampling time (T
Figure
Calling f
the anti-aliasing filter, f
least 2f
the conversion period (T
T
selected (fastest conversion rate at a specific channel): In conclusion, it is evident that the
S
, which is just a portion of it, even when fixed channel continuous conversion mode is
A first and quick charge transfer from the internal capacitances C
sampling capacitance C
Considering a worst case (since the time constant in reality would be faster) in which
C
C
This relation can again be simplified considering only C
condition. In reality, the transient is faster, but the A/D converter circuitry has been
designed to also be robust in the very worst case: The sampling time T
much longer than the internal time constant:
The charge of C
voltage V
A second charge transfer also involves C
capacitance) through the resistance R
and C
time constant is:
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
R
Of course, R
combination with R
definitely bigger than C
charge transfer transient) will be much higher than V
respected (charge balance assuming now C
P2
S
L
49).
0
F
sizing is obtained:
0
, meaning that the constant time of the filter is greater than or at least equal to twice
are in series and the time constant is:
C
is reported in parallel to C
the bandwidth of the source signal (and as a consequence the cut-off frequency of
F
S
filter, cannot provide the extra charge to compensate for the voltage drop on C
were in parallel to C
A1
on the capacitance according to the following equation:
L
must also be sized according to the current limitation constraints, in
P1
F
V
), according to Nyquist theorem the conversion rate f
and C
S
C
A2
). Again the conversion period T
(source impedance) and R
(
⋅
C
P1
S
S
V
+
P2
10 τ
A1
, C
occurs (C
C
S
⋅
P1
). The filter is typically designed to act as anti-aliasing (see
⋅
P1
is also redistributed on C
P2
A
(
2
C
+
; the time constant R
τ
τ
=
P1
S
1
1
(since the time constant in reality would be faster), the
τ
C
and C
2
10 R
+
<
P2
=
<
(call C
(
C
(
⋅
R
R
R
+
P1
SW
SW
L
C
S
L
⋅
F
+
⋅
S
is supposed initially completely discharged):
(
)
L
(
C
+
C
, then the final voltage V
+
C
=
: Again considering the worst case in which C
S
P2
P
R
V
R
S
+
AD
A
AD
F
+
= C
)
⋅
C
C
C
(that is typically bigger than the on-chip
=
)
P1
F
)
P1
⋅
S
+
⋅
V
C
P1
---------------------- -
C
C
+
V
A
already charged at V
S
+
P
P
A1
C
<< T
⋅
C
F
+ C
+
(
⋅
P2
C
P2
(
⋅
C
C
C
(filter resistance). Being that C
P1
S
S
S
)
F
P1
)
P2
C
A1
≤
+
C
S
+
F
), the two capacitances C
C
T
. The following equation must be
, determining a new value of the
C
is longer than the sampling time
S
P2
of the filter is very high with
S
P2
)
as an additional worst
+
C
S
)
A2
P1
(at the end of the
A1
and C
S
):
, a constraint on
S
C
is always
must be at
P2
ST10F276E
to the
P
F
and
is
P2
S