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STM32F042C4 Datasheet(PDF) 80 Page - STMicroelectronics

Part # STM32F042C4
Description  Reset and power management
PDF  117 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM32F042C4 Datasheet(HTML) 80 Page - STMicroelectronics

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Electrical characteristics
STM32F042x4 STM32F042x6
80/117
DocID025832 Rev 5
Equation 1: RAIN max formula
The formula above (Equation 1) is used to determine the maximum external impedance
allowed for an error below 1/4 of LSB. Here N = 12 (from 12-bit resolution).
RAIN
TS
fADC CADC
2
N2
+
()
ln
×
×
----------------------------------------------------------------
RADC
–
<
Table 55. RAIN max for fADC = 14 MHz
Ts (cycles)
tS (µs)
RAIN max (kΩ)
(1)
1.5
0.11
0.4
7.5
0.54
5.9
13.5
0.96
11.4
28.52.0425.2
41.52.9637.2
55.5
3.96
50
71.5
5.11
NA
239.5
17.1
NA
1. Guaranteed by design, not tested in production.
Table 56. ADC accuracy(1)(2)(3)
Symbol
Parameter
Test conditions
Typ
Max(4)
Unit
ET
Total unadjusted error
fPCLK = 48 MHz,
fADC = 14 MHz, RAIN < 10 kΩ
VDDA = 3 V to 3.6 V
TA = 25 °C
±1.3
±2
LSB
EO
Offset error
±1
±1.5
EG
Gain error
±0.5
±1.5
ED
Differential linearity error
±0.7
±1
EL
Integral linearity error
±0.8
±1.5
ET
Total unadjusted error
fPCLK = 48 MHz,
fADC = 14 MHz, RAIN < 10 kΩ
VDDA = 2.7 V to 3.6 V
TA = - 40 to 105 °C
±3.3
±4
LSB
EO
Offset error
±1.9
±2.8
EG
Gain error
±2.8
±3
ED
Differential linearity error
±0.7
±1.3
EL
Integral linearity error
±1.2
±1.7
ET
Total unadjusted error
fPCLK = 48 MHz,
fADC = 14 MHz, RAIN < 10 kΩ
VDDA = 2.4 V to 3.6 V
TA = 25 °C
±3.3
±4
LSB
EO
Offset error
±1.9
±2.8
EG
Gain error
±2.8
±3
ED
Differential linearity error
±0.7
±1.3
EL
Integral linearity error
±1.2
±1.7
1. ADC DC accuracy values are measured after internal calibration.



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