Datasheet

Electrical characteristics STM32L476xx
122/270 DS10198 Rev 8
6.3.4 Embedded voltage reference
The parameters given in Table 26 are derived from tests performed under the ambient
temperature and supply voltage conditions summarized in Table 23: General operating
conditions.
Table 26. 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
Average temperature
coefficient
–40°C < T
A
< +130°C - 30 50
(2)
ppm/°C
A
Coeff
Long term stability 1000 hours, T = 25°C - 300 1000
(2)
ppm
V
DDCoeff
Average 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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