Datasheet

DocID15962 Rev 13 99/131
STM8L151xx, STM8L152xx Electrical parameters
112
9.3.10 Embedded reference voltage
In the following table, data is based on characterization results, not tested in production,
unless otherwise specified.
Table 46. Reference voltage characteristics
Symbol Parameter Conditions Min Typ Max. Unit
I
REFINT
Internal reference voltage
consumption
-1.4- µA
T
S_VREFINT
(1)(2)
ADC sampling time when reading
the internal reference voltage
- 5 10 µs
I
BUF
(2)
Internal reference voltage buffer
consumption (used for ADC)
-13.525 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)
--± 5mV
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
- -20ppm/°C
STAB
VREFINT
Stability of V
REFINT
after 1000
hours
--TBD ppm
1. Defined when ADC 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 ADC conversion accuracy.