STM32U073RCI6 datasheet(47/146 Pages) STMICROELECTRONICS

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6.3.4

Embedded voltage reference

The parameters given in Table 25. Embedded internal voltage reference are derived from tests performed under

the ambient temperature and supply voltage conditions summarized in Section 6.3.1: General operating

conditions.

Table 25. 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

300

1000(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. Specified by design, not tested in production.

Figure 15. VREFINT versus temperature

1.185

1.19

1.195

1.2

1.205

1.21

1.215

1.22

1.225

1.23

1.235

-40

-20

100

120

°C

Mean

Min

Max

STM32U073x8/B/C

Electrical characteristics

DS14548 - Rev 2

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