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STR750F Scheda tecnica(PDF) 65 Page - STMicroelectronics

Il numero della parte STR750F
Spiegazioni elettronici  ARM7TDMI-S, 32-bit MCU with Flash, SMI, 3 std 16-bit timers PWM timer, fast 10-bit ADC, I2C, UART, SSP, USB and CAN
PDF  73 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STR750F Scheda tecnica(HTML) 65 Page - STMicroelectronics

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STR750F
Electrical parameters
65/71
ADC Accuracy vs. Negative Injection Current
Injecting negative current on specific pins listed in Table 41 (generally adjacent to the analog
input pin being converted) should be avoided as this significantly reduces the accuracy of
the conversion being performed. It is recommended to add a Schottky diode (pin to ground)
to pins which may potentially inject negative current.
Figure 30.
Typical application with ADC
Analog Power Supply and Reference Pins
The VDDA_ADC and VSSA_ADC pins are the analog power supply of the A/D converter cell.
Separation of the digital and analog power pins allow board designers to improve A/D
performance. Conversion accuracy can be impacted by voltage drops and noise in the event
of heavily loaded or badly decoupled power supply lines (see : General PCB Design
Guidelines on page 66).
Table 41.
List of adjacent pins
Analog input
Related adjacent pins
aNone
AIN1/P0.03
None
AIN2/P0.12
P0.11
AIN3/P0.17
P0.18 and P0.16
AIN4/P0.19
P0.24
AIN5/P0.22
None
AIN6/P0.23
P2.04
AIN7/P0.27
P1.11 and P0.26
AIN8/P0.29
P0.30 and P0.28
AIN9/P1.04
None
AIN10/P1.06
P1.05
AIN11/P1.08
P1.04 and P1.13
AIN12/P1.11
P2.17 and P0.27
AIN13/P1.12
None
AIN14/P1.13
P1.14 and P1.01
AIN15/P1.14
None
AINx
STR75XX
VDD
IL
±1
µA
VT
0.6V
VT
0.6V
CADC
3.2pF
VAIN
RAIN
10-Bit A/D
Conversion
2k
Ω(max)
CAIN



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