STM32MP157C datasheet(133/258 Pages) STMICROELECTRONICS

133 / 258 page

DS12505 Rev 2

133/258

STM32MP157C

Electrical characteristics

238

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

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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