CD00237391 datasheet(123/177 Pages) STMICROELECTRONICS

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STM32F20xxx

Electrical characteristics

Doc ID 15818 Rev 9

123/177

5.3.24

Embedded reference voltage

The parameters given in Table 69 are derived from tests performed under ambient

temperature and VDD supply voltage conditions summarized in Table 12.

5.3.25

FSMC characteristics

Asynchronous waveforms and timings

Figure 54 through Figure 57 represent asynchronous waveforms and Table 70 through

Table 73 provide the corresponding timings. The results shown in these tables are obtained

with the following FSMC configuration:

●

AddressSetupTime = 1

●

AddressHoldTime = 1

●

DataSetupTime = 1

●

BusTurnAroundDuration = 0x0

In all timing tables, the THCLK is the HCLK clock period.

Table 69.

Embedded 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)

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

ADC sampling time when

reading the internal reference

voltage

µs

VRERINT_s

(2)

Guaranteed by design, not tested in production.

Internal reference voltage

spread over the temperature

range

VDD = 3 V

TCoeff

(2)

Temperature coefficient

ppm/°C

tSTART

(2)

Startup time

µs

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