STM32F446RC datasheet(148/202 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32F446xC/E

148/202

DocID027107 Rev 6

6.3.23

VBAT monitoring characteristics

6.3.24

Reference voltage

The parameters given in Table 83 are derived from tests performed under ambient

temperature and VDD supply voltage conditions summarized in Table 16.

6.3.25

DAC electrical characteristics

Table 82. VBAT monitoring characteristics

Symbol

Parameter

Min

Typ

Max

Unit

Resistor bridge for VBAT

-50-

Ratio on VBAT measurement

Er(1)

Error on Q

- 1

+ 1

TS_vbat(2)(2)

ADC sampling time when reading the VBAT

1 mV accuracy

µs

1. Guaranteed by design.

2. Shortest sampling time can be determined in the application by multiple iterations.

Table 83. internal reference voltage

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VREFINT

Internal reference voltage

–40 °C < TA < +105 °C

1.18

1.21

1.24

TS_vrefint(1)

ADC sampling time when reading the

internal reference voltage

-10

µs

VRERINT_s(2)

Internal reference voltage spread over the

temperature range

VDD = 3V ± 10mV

TCoeff(2)

Temperature coefficient

ppm/°C

tSTART(2)

Startup time

µs

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

2. Guaranteed by design.

Table 84. Internal reference voltage calibration values

Symbol

Parameter

Memory address

VREFIN_CAL Raw data acquired at temperature of 30 °C VDDA = 3.3 V

0x1FFF 7A2A - 0x1FFF 7A2B

Table 85. DAC characteristics

Symbol

Parameter

Conditions

Min

Typ

Max Unit

Comments

VDDA

Analog supply

voltage

-1.7(1)

-3.6

VREF+

Reference supply

voltage

-1.7(1)

-3.6

VREF+ ≤VDDA

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