ST10F276-6Q3 STMicroelectronics, ST10F276-6Q3 Datasheet - Page 191

• Manufacturer Part Number: ST10F276-6Q3
• Description: MCU 16BIT 832K FLASH 144-PQFP
• Manufacturer: STMicroelectronics
• Series: ST10r

Specifications of ST10F276-6Q3

• 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: -

ST10F276E
time constant of the filter R
charge level on C
the sampling switch is closed.
Figure 49. Anti-aliasing filter and conversion rate
The considerations above lead to impose new constraints to the external circuit, to reduce
the accuracy error due to the voltage drop on C
above, it is simple to derive the following relation between the ideal and real sampled volt-
age on C
From this formula, in the worst case (when V
ing to accept a maximum error of half a count (~2.44mV), it is immediately evident that a
constraint is on C
The next section provides an example of how to design the external network, based on
some reasonable values for the internal parameters and on a hypothesis on the characteris-
tics of the analog signal to be sampled.
Anti-aliasing filter (f
Analog source bandwidth (V
S
:
f
f
0
F
F
S
F
= RC Filter pole)
value:
cannot be modified by the analog signal source during the time in which
Noise
f
f
A
F
)
C
F
is definitely much higher than the sampling time T
----------- -
V
V
A2
Sampled signal spectrum (f
A
TC ≤ 2 RFCF (Conversion rate vs. filter pole)
f
2 f0 ≤ fC (Nyquist)
F
=
= f
C
------------------------------------------------------------ -
C
F
P1
0
C
>
(Anti-aliasing Filtering Condition)
P1
+
A
2048
C
f
+
is maximum, that is for instance 5V), assum-
0
P2
S
C
P2
; from the two charge balance equations
C
⋅
+
S
C
+
F
C
+
F
C
S
C
= conversion Rate)
f
C
Electrical characteristics
f
S
, so the
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