STM32L432KB datasheet(65/149 Pages) STMICROELECTRONICS

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STM32L432KB STM3L432KC

Electrical characteristics

142

6.3.4

Embedded voltage reference

The parameters given in Table 23 are derived from tests performed under the ambient

temperature and supply voltage conditions summarized in Table 20: General operating

conditions.

Table 23. Embedded internal voltage reference

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VREFINT

Internal reference voltage

–40 °C < TA < +130 °C

1.182

1.212

1.232

tS_vrefint (1)

ADC sampling time when

reading the internal reference

voltage

-4(2)

µs

tstart_vrefint

Start time of reference voltage

buffer when ADC is enable

12(2)

µs

IDD(VREFINTBUF)

VREFINT buffer consumption

from VDD when converted by

ADC

12.5

20(2)

µA

∆VREFINT

Internal reference voltage

spread over the temperature

range

VDD = 3 V

7.5(2)

TCoeff

Temperature coefficient

–40°C < TA < +130°C

50(2)

ppm/°C

ACoeff

Long term stability

1000 hours, T = 25°C

TBD(2)

ppm

VDDCoeff

Voltage coefficient

3.0 V < VDD < 3.6 V

250

1200(2)

ppm/V

VREFINT_DIV1

1/4 reference voltage

VREFINT

VREFINT_DIV2

1/2 reference voltage

VREFINT_DIV3

3/4 reference voltage

1. The shortest sampling time can be determined in the application by multiple iterations.

2. Guaranteed by design.

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