Datasheet

STM8L151x2, STM8L151x3 Electrical parameters
Doc ID 018780 Rev 4 85/112
7.3.9 Embedded reference voltage
In the following table, data is based on characterization results, not tested in production,
unless otherwise specified.
Table 41. Reference voltage characteristics
Symbol Parameter Conditions Min Typ Max. Unit
I
REFINT
Internal reference voltage
consumption
1.4 µA
T
S_VREFINT
(1)(2)
ADC1 sampling time when reading
the internal reference voltage
510 µs
I
BUF
(2)
Internal reference voltage buffer
consumption (used for ADC1)
13.5 25 µA
V
REFINT out
Reference voltage output 1.202
(3)
1.224 1.242
(3)
V
I
LPBUF
(2)
Internal reference voltage low
power buffer consumption (used for
comparators or output)
730 1200 nA
I
REFOUT
(2)
Buffer output current
(4)
1µA
C
REFOUT
Reference voltage output load 50 pF
t
VREFINT
Internal reference voltage startup
time
23ms
t
BUFEN
(2)
Internal reference voltage buffer
startup time once enabled
(1)
10 µs
ACC
VREFINT
Accuracy of V
REFINT
stored in the
VREFINT_Factory_CONV byte
(5)
± 5 mV
STAB
VREFINT
Stability of V
REFINT
over
temperature
-40 °C ≤ T
A
≤
125 °C
20 50 ppm/°C
Stability of V
REFINT
over
temperature
0 °C ≤ T
A
≤ 50
°C
20 ppm/°C
STAB
VREFINT
Stability of V
REFINT
after 1000
hours
TBD ppm
1. Defined when ADC1 output reaches its final value ±1/2LSB
2. Data guaranteed by Design. Not tested in production.
3. Tested in production at V
DD
= 3 V ±10 mV.
4. To guaranty less than 1%
V
REFOUT
deviation.
5. Measured at V
DD
= 3 V ±10 mV. This value takes into account V
DD
accuracy and ADC1 conversion accuracy.