ST10F272M-4TR3 STMicroelectronics, ST10F272M-4TR3 Datasheet - Page 139
ST10F272M-4TR3
Manufacturer Part Number
ST10F272M-4TR3
Description
MCU 16BIT 256K FLASH 144-LQFP
Manufacturer
STMicroelectronics
Series
ST10r
Datasheet
1.ST10F272M-4TR3.pdf
(176 pages)
Specifications of ST10F272M-4TR3
Core Processor
ST10
Core Size
16-Bit
Speed
40MHz
Connectivity
ASC, CAN, EBI/EMI, I²C, SSC, UART/USART
Peripherals
POR, PWM, WDT
Number Of I /o
111
Program Memory Size
256KB (256K x 8)
Program Memory Type
FLASH
Ram Size
20K 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
Processor Series
ST10F27x
Core
ST10
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Lead Free Status / Rohs Status
Details
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ST10F272M-4TR3
Manufacturer:
STMicroelectronics
Quantity:
10 000
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ST10F272M
The considerations above imposes new constraints on 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
voltage on C
From this formula, in the worst case (when V
assuming to accept a maximum error of half a count (~2.44 mV), a constraint is immediately
evident on C
In the next section an example of how to design the external network is provided, assuming
some reasonable values for the internal parameters and making a hypothesis on the
characteristics of the analog signal to be sampled.
Example of external network sizing
The following hypotheses are formulated in order to proceed in designing the external
network on A/D converter input pins:
●
●
●
●
●
●
●
●
●
●
●
Analog signal source bandwidth (f
Conversion rate (f
Sampling time (T
Pin input capacitance (C
Pin input routing capacitance (C
Sampling capacitance (C
Maximum input current injection (I
Maximum analog source voltage (V
Analog source impedance (R
Channel switch resistance (R
Sampling switch resistance (R
S
F
:
value:
S
C
): 1µs
): 25 kHz
P1
S
): 4pF
): 5 pF
-----------
V A2
V A
S
SW
AD
): 100 Ω
=
P2
): 500 Ω
): 200 Ω
C F 2048 C S
0
INJ
------------------------------------------------------------
C P1
): 1 pF
): 10 kHz
AM)
): 3 mA
C P1
>
: 12 V
S
+
A
. From the two charge balance equations
C P2
+
is maximum, that is for instance 5 V),
C P2
⋅
+
C F
+
C F
+
C S
Electrical characteristics
139/176
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