STM32MP151AAB3T datasheet(130/245 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32MP151A

130/245

DS12500 Rev 1

6.3.4

Embedded reference voltage

The parameters given in Table 16, Table 17 are derived from tests performed under ambient

temperature and VDD supply voltage conditions summarized in Table 13: General operating

conditions.

Table 16. Embedded reference voltage

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VREFINT

Internal reference voltages

-40 °C < TJ < 125 °C

1.175

1.210

1.241

tS_vrefint(1)(2)

ADC sampling time when

reading the internal reference

voltage

-4.3

µs

tS_vbat(1)

VBAT sampling time when

reading the internal VBAT

reference voltage

-9.8

tstart_vrefint

Start time of reference voltage

buffer when ADC is enable

0.8

4.6

Irefbuf(2)

Reference Buffer consumption

for ADC

VDDA = 3.3 V

9.1

13.6

27.7

µA

∆VREFINT(2)

Internal reference voltage

spread over the temperature

range

-40 °C < TJ < 125 °C

4.3

Tcoeff_VREFINT

Average temperature

coefficient

Average temperature

coefficient

-19

ppm/°C

Acoeff

Long term stability

1000 hours, T = 25 °C

TBD

ppm/°C

VDDcoeff

Average Voltage coefficient

3.0 V < VDD < 3.6 V

1370

ppm/V

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

Guaranteed by design.

Table 17. Embedded reference voltage calibration value

Symbol

Parameter

Memory address

VREFIN_CAL

Raw data acquired at temperature of 30 °C, VDDA = VREF+ = 3.3 V

0x5C00 5250[31:16](1)(2)

1. Mandatory to read in 32-bits word and do relevant mask and shift to isolate required bits.

2. These address is inside BSEC which should be enabled in RCC to allow access.

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