Datasheet

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STM32L431xx Electrical characteristics
168
6.3.4 Embedded voltage reference
The parameters given in Table 24 are derived from tests performed under the ambient
temperature and supply voltage conditions summarized in Table 21: General operating
conditions.
Table 24. Embedded internal voltage reference
Symbol Parameter Conditions Min Typ Max Unit
V
REFINT
Internal reference voltage –40 °C < T
A
< +130 °C 1.182 1.212 1.232 V
t
S_vrefint
(1)
ADC sampling time when
reading the internal reference
voltage
-4
(2)
--µs
t
start_vrefint
Start time of reference voltage
buffer when ADC is enable
--812
(2)
µs
I
DD
(V
REFINTBUF
)
V
REFINT
buffer consumption
from V
DD
when converted by
ADC
- - 12.5 20
(2)
µA
V
REFINT
Internal reference voltage
spread over the temperature
range
V
DD
= 3 V - 5 7.5
(2)
mV
T
Coeff
Temperature coefficient –40°C < T
A
< +130°C - 30 50
(2)
ppm/°C
A
Coeff
Long term stability 1000 hours, T = 25°C - - TBD
(2)
ppm
V
DDCoeff
Voltage coefficient 3.0 V < V
DD
< 3.6 V - 250 1200
(2)
ppm/V
V
REFINT_DIV1
1/4 reference voltage
-
24 25 26
%
V
REFINT
V
REFINT_DIV2
1/2 reference voltage 49 50 51
V
REFINT_DIV3
3/4 reference voltage 74 75 76
1. The shortest sampling time can be determined in the application by multiple iterations.
2. Guaranteed by design.
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