STM32L021D4 datasheet(84/114 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32L021x4

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DocID027982 Rev 5

Figure 27. Typical connection diagram using the ADC

1. Refer to Table 53: ADC characteristics for the values of RAIN, RADC and CADC.

2. Cparasitic represents the capacitance of the PCB (dependent on soldering and PCB layout quality) plus the

pad capacitance (roughly 7 pF). A high Cparasitic value will downgrade conversion accuracy. To remedy

this, fADC should be reduced.

6.3.16

Temperature sensor characteristics

Table 56. Temperature sensor calibration values

Calibration value name

Description

Memory address

TS_CAL2

TS ADC raw data acquired at

temperature of 130 °C

± 5°C,

VDDA= 3 V ± 10 mV

0x1FF8 007E - 0x1FF8 007F

Table 57. Temperature sensor characteristics

Symbol

Parameter

Min

Typ

Max

Unit

TL(1)

1. Guaranteed by characterization results, not tested in production.

VSENSE linearity with temperature

±1

±2°C

Avg_Slope(1)

Average slope

1.48

1.61

1.75

mV/°C

V130

Voltage at 130°C ±5°C(2)

2. Measured at VDD = 3 V ±10 mV. V30 ADC conversion result is stored in the TS_CAL1 byte.

640

670

700

IDDA(TEMP)(3)

Current consumption

3.4

µA

tSTART(3)

3. Guaranteed by design, not tested in production.

Startup time

µs

TS_temp(4)(3)

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

ADC sampling time when reading the

temperature

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