Embedded Internal Reference Voltage; Table 15. Embedded Internal Reference Voltage Calibration Values; Table 16. Embedded Internal Reference Voltage - STMicroelectronics STM32L151CB Manual

Electrical characteristics
6.3.3

Embedded internal reference voltage

The parameters given in the following table are based on characterization results, unless
otherwise specified.
Calibration value name
VREFINT_CAL
Symbol
(1)
V Internal reference voltage
REFINT out
I Internal reference current consumption
REFINT
T Internal reference startup time
VREFINT
V
DDA
V
VREF_MEAS
factory measure
Accuracy of factory-measured V
A
VREF_MEAS
value
(3)
T Temperature coefficient
Coeff
(3)
A Long-term stability
Coeff
(3)
V Voltage coefficient
DDCoeff
ADC sampling time when reading the
(3)(4)
T
S_vrefint
internal reference voltage
Startup time of reference voltage buffer
(3)
T
ADC_BUF
for ADC
Consumption of reference voltage
(3)
I
BUF_ADC
buffer for ADC
(3)
I VREF_OUT output current
VREF_OUT
(3)
C VREF_OUT output load
VREF_OUT
Consumption of reference voltage
(3)
I
LPBUF
buffer for VREF_OUT and COMP
(3)
V 1/4 reference voltage
REFINT_DIV1
(3)
V 1/2 reference voltage
REFINT_DIV2
(3)
V 3/4 reference voltage
REFINT_DIV3
1. Tested in production.
2. The internal V value is individually measured in production and stored in dedicated EEPROM bytes.
REF
3. Guaranteed by design, not tested in production.
4. Shortest sampling time can be determined in the application by multiple iterations.
5. To guarantee less than 1% VREF_OUT deviation.
54/129

Table 15. Embedded internal reference voltage calibration values

Table 16. Embedded internal reference voltage

Parameter
and V voltage during V
REF+
(2)
(5)
Description
Raw data acquired at
temperature of 30 °C, V
Conditions
– 40 °C < T < +105 °C 1.202 1.224 1.242
J
-
-
REFINT
-
Including uncertainties
REF
due to ADC and
V /V
DDA REF+
–40 °C < T < +105 °C
J
0 °C < T < +50 °C
J
1000 hours, T= 25 °C
3.0 V < V
DDA
-
-
-
-
-
-
-
-
-
DocID17659 Rev 10
STM32L151x6/8/B, STM32L152x6/8/B
Memory address
0x1FF8 0078-0x1FF8 0079
= 3 V
DDA
Min Typ
- 1.4
- 2
2.99 3
- -
values
- 20
- -
- -
< 3.6 V - -
5 10
- -
- 13.5
- -
- -
- 730
24 25
49 50
74 75
Max Unit
V
2.3 µA
3 ms
3.01 V
±5 mV
50
ppm/°C
20
1000 ppm
2000 ppm/V
- µs
10 µs
25 µA
1 µA
50 pF
1200 nA
26
51 % V
REFINT
76