STM32U385CG datasheet(96/224 Pages) STMICROELECTRONICS

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Table 30. Embedded internal voltage reference

The values in this table are specified by design and not tested in production.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VREFINT(1)

Internal reference

voltages

Range 1

1.175

1.215

1.243

Range 2 and low-power

modes

1.170

1.215

1.248

tS_vrefint(2)

ADC sampling time when

reading the internal

reference voltage

12.65

µs

tstart_vrefint

Start time of reference

voltage buffer when ADC

is enabled

µs

IDD(VREFINTBUF)

VREFINT buffer

consumption from VDD

when converted by ADC

1.5

2.1

µA

ΔVREFINT

Internal reference

voltage spread over the

temperature range

VDD = 3 V

8.75

Tcoeff

Average temperature

coefficient

-40 °C < TJ < 110 °C

ppm/°C

Acoeff

Long-term stability

1000 hours, TJ = 25°C

400

1000

ppm

VDDcoeff

Average voltage

coefficient

3.0 V < VDD < 3.6 V

726

1900

ppm/V

VREFINT_DIV1

1/4 reference voltage

VDD = 3.3 V

% VREFINT

VREFINT_DIV2

1/2 reference voltage

VDD = 3.3 V

VREFINT_DIV3

3/4 reference voltage

VDD = 3.3 V

1. VREFINT does not take into account package and soldering effects.

2. The shortest sampling time for the application can be determined by multiple iterations.

Figure 27. VREFINT versus temperature

1.190

1.195

1.200

1.205

1.210

1.215

1.220

1.225

1.230

-40

-30

-20

-10

100

110

Temperature ( C)

Mean

Min

Max

STM32U385xx

Electrical characteristics

DS14830 - Rev 2

page 96/224

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