STM32WL55JC datasheet(121/145 Pages) STMICROELECTRONICS

121 / 145 page

DS13293 Rev 1

121/145

STM32WL55/54xx

Electrical characteristics

135

Figure 23. Typical connection diagram using the ADC

1. Refer to Table 82: ADC accuracy 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

(refer to Table 75: I/O static characteristics for the value of the pad capacitance). A high Cparasitic value downgrades the

conversion accuracy. To remedy this, fADC must be reduced.

3. Refer to Table 75: I/O static characteristics for the values of Ilkg.

General PCB design guidelines

Power supply decoupling must be performed as shown in Figure 13: Power supply scheme.

The 100 nF capacitor must be ceramic (good quality) and must be placed as close as

possible to the chip.

5.3.20

Temperature sensor characteristics

MS33900V5

Sample and hold ADC converter

12-bit

converter

Cparasitic

(2)

Ilkg

(3)

CADC

VDDA

RAIN

(1)

VAIN

AINx

RADC

Table 83. TS characteristics

Symbol

Parameter

Min

Typ

Max

Unit

TL(1)

VTS linearity with temperature

±1

±2

°C

Avg_Slope(2)

Average slope

2.3

2.5

2.7

mV/°C

V30

Voltage at 30 °C (±5 °C)(3)

0.742

0.76

0.785

tSTART

(TS_BUF)(1)

Sensor buffer startup time in continuous mode(4)

-8

µs

tSTART(1)

Startup time when entering in continuous mode(4)

-70

120

µs

tS_temp(1)

ADC sampling time when reading the temperature

µs

IDD(TS)(1)

Temperature sensor consumption from VDD, when

selected by the ADC

-4.7

µA

1. Guaranteed by design.

2. Guaranteed by characterization results.

3. Measured at VDDA = 3.3 V ±10 mV. The V30 ADC conversion result is stored in the TS_CAL1 byte. Refer to

Table 12: Temperature sensor calibration values.

Continuous mode means Run and Sleep modes, or temperature sensor enable in LPRun and LPSleep modes.

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