Datasheet

Electrical characteristics STM32F051x4 STM32F051x6 STM32F051x8
76/121 DocID022265 Rev 6
Figure 24. Recommended NRST pin protection
1. The external capacitor protects the device against parasitic resets.
2. The user must ensure that the level on the NRST pin can go below the V
IL(NRST)
max level specified in
Table 51: NRST pin characteristics. Otherwise the reset will not be taken into account by the device.
6.3.16 12-bit ADC characteristics
Unless otherwise specified, the parameters given in Table 52 are derived from tests
performed under the conditions summarized in Table 20: General operating conditions.
Note: It is recommended to perform a calibration after each power-up.
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Table 52. ADC characteristics
Symbol Parameter Conditions Min Typ Max Unit
V
DDA
Analog supply voltage for
ADC ON
- 2.4 - 3.6 V
I
DDA (ADC)
Current consumption of
the ADC
(1)
V
DDA
= 3.3 V - 0.9 - mA
f
ADC
ADC clock frequency - 0.6 - 14 MHz
f
S
(2)
Sampling rate 12-bit resolution 0.043 - 1 MHz
f
TRIG
(2)
External trigger frequency
f
ADC
= 14 MHz,
12-bit resolution
--823kHz
12-bit resolution - - 17 1/f
ADC
V
AIN
Conversion voltage range - 0 - V
DDA
V
R
AIN
(2)
External input impedance
See Equation 1 and
Table 53 for details
--50kΩ
R
ADC
(2)
Sampling switch
resistance
---1kΩ
C
ADC
(2)
Internal sample and hold
capacitor
---8pF
t
CAL
(2)(3)
Calibration time
f
ADC
= 14 MHz 5.9 µs
-831/f
ADC
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