Datasheet

DS10668 Rev 6 55/126
STM32L031x4/6 Electrical characteristics
96
6.3.3 Embedded internal reference voltage
The parameters given in Table 23 are based on characterization results, unless otherwise
specified.
Table 22. Embedded internal reference voltage calibration values
Calibration value name Description Memory address
VREFINT_CAL
Raw data acquired at temperature
of 25 °C, V
DDA
= 3 V
0x1FF8 0078 - 0x1FF8 0079
Table 23. Embedded internal reference voltage
(1)
Symbol Parameter Conditions Min Typ Max Unit
V
REFINT out
(2)
Internal reference voltage – 40 °C < T
J
< +125 °C 1.202 1.224 1.242 V
T
VREFINT
Internal reference startup time - - 2 3 ms
V
VREF_MEAS
V
DDA
voltage during V
REFINT
factory measure
-2.9933.01V
A
VREF_MEAS
Accuracy of factory-measured
V
REFINT
value
(3)
Including uncertainties
due to ADC and V
DDA
values
-- ±5mV
T
Coeff
(4)
Temperature coefficient –40 °C < T
J
< +125 °C - 25 100 ppm/°C
A
Coeff
(4)
Long-term stability 1000 hours, T = 25 °C - - 1000 ppm
V
DDCoeff
(4)
Voltage coefficient 3.0 V < V
DDA
< 3.6 V - - 2000 ppm/V
T
S_vrefint
(4)(5)
ADC sampling time when
reading the internal reference
voltage
-510-µs
T
ADC_BUF
(4)
Startup time of reference
voltage buffer for ADC
---10µs
I
BUF_ADC
(4)
Consumption of reference
voltage buffer for ADC
- - 13.5 25 µA
I
VREF_OUT
(4)
VREF_OUT output current
(6)
---1µA
C
VREF_OUT
(4)
VREF_OUT output load - - - 50 pF
I
LPBUF
(4)
Consumption of reference
voltage buffer for VREF_OUT
and COMP
- - 730 1200 nA
V
REFINT_DIV1
(4)
1/4 reference voltage - 24 25 26
%
V
REFINT
V
REFINT_DIV2
(4)
1/2 reference voltage - 49 50 51
V
REFINT_DIV3
(4)
3/4 reference voltage - 74 75 76
1. Refer to Table 35: Peripheral current consumption in Stop and Standby mode for the value of the internal reference current
consumption (I
REFINT
).
2. Guaranteed by test in production.
3. The internal V
REF
value is individually measured in production and stored in dedicated EEPROM bytes.
4. Guaranteed by design.
5. Shortest sampling time can be determined in the application by multiple iterations.
6. To guarantee less than 1% VREF_OUT deviation.
Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.