STM8L051F3 datasheet(79/96 Pages) STMICROELECTRONICS

79 / 96 page

DS9178 Rev 4

79/96

STM8L051F3

Electrical parameters

8.3.9

Embedded reference voltage

In the following table, data is based on characterization results, not tested in production,

unless otherwise specified.

8.3.10

12-bit ADC1 characteristics

In the following table, data is guaranteed by design, not tested in production.

Table 42. Reference voltage characteristics

Symbol

Parameter

Conditions

Min

Typ

Max.

Unit

IREFINT

Internal reference voltage

consumption

1.4

µA

TS_VREFINT(1)(2)

ADC sampling time when reading

the internal reference voltage

µs

IBUF(2)

Internal reference voltage buffer

consumption (used for ADC)

13.5

µA

VREFINT out

Reference voltage output

1.202(3)

1.224

1.242(3)

ILPBUF(2)

Internal reference voltage low-

power buffer consumption

730

1200

IREFOUT(2)

Buffer output current(4)

µA

CREFOUT

Reference voltage output load

tVREFINT

Internal reference voltage startup

time

tBUFEN(2)

Internal reference voltage buffer

startup time once enabled (1)

µs

ACCVREFINT

Accuracy of VREFINT stored in the

VREFINT_Factory_CONV byte(5)

± 5

STABVREFINT

Stability of VREFINT over

temperature

-40 °C

≤ TA ≤ 85

°C

-20

ppm/°C

Stability of VREFINT over

temperature

0 °C

≤ TA ≤ 50 °C

ppm/°C

STABVREFINT

Stability of VREFINT after 1000

hours

TBD

ppm

1. Defined when ADC output reaches its final value ±1/2LSB

2. Data guaranteed by design.

3. Tested in production at VDD = 3 V ±10 mV.

4. To guaranty less than 1%

VREFOUT deviation.

5. Measured at VDD = 3 V ±10 mV. This value takes into account VDD accuracy and ADC conversion accuracy.

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