STM32L151VBT6DTR datasheet(53/121 Pages) STMICROELECTRONICS

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STM32L151x6/8/B, STM32L152x6/8/B

Electrical characteristics

Doc ID 17659 Rev 8

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6.3.3

Embedded internal reference voltage

The parameters given in Table 16 are based on characterization results, unless otherwise

specified.

Table 16.

Embedded internal reference voltage

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VREFINT out

(1)

Internal reference voltage

– 40 °C < TJ < +105 °C

1.202

1.224

1.242

IREFINT

Internal reference current

consumption

1.4

2.3

µA

TVREFINT

Internal reference startup time

VVREF_MEAS

VDDA and VREF+ voltage during

VREFINT factory measure

2.99

3.01

AVREF_MEAS

Accuracy of factory-measured

VREF value

(2)

Including uncertainties

due to ADC and

VDDA/VREF+ values

±5

TCoeff

(3)

Temperature coefficient

–40 °C < TJ < +105 °C

ppm/°C

0 °C < TJ < +50 °C

ACoeff

(3)

Long-term stability

1000 hours, T= 25 °C

1000

ppm

VDDCoeff(3)

Voltage coefficient

3.0 V < VDDA < 3.6 V

2000

ppm/V

TS_vrefint

(3)(4)

ADC sampling time when

reading the internal reference

voltage

510

µs

TADC_BUF

(3)

Startup time of reference voltage

buffer for ADC

µs

IBUF_ADC

(3)

Consumption of reference

voltage buffer for ADC

13.5

µA

IVREF_OUT

(3)

VREF_OUT output current(5)

1µA

CVREF_OUT

(3)

VREF_OUT output load

ILPBUF

(3)

Consumption of reference

voltage buffer for VREF_OUT

and COMP

730

1200

VREFINT_DIV1

(3)

1/4 reference voltage

VREFINT

VREFINT_DIV2

(3)

1/2 reference voltage

VREFINT_DIV3

(3)

3/4 reference voltage

Tested in production;

The internal VREF value is individually measured in production and stored in dedicated EEPROM bytes.

Guaranteed by design, not tested in production.

Shortest sampling time can be determined in the application by multiple iterations.

To guarantee less than 1% VREF_OUT deviation.

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