STM32WL55JC datasheet(123/147 Pages) STMICROELECTRONICS

123 / 147 page

DS13293 Rev 2

123/147

STM32WL55/54xx

Electrical characteristics

137

Figure 23. Typical connection diagram when using the ADC

with FT/TT pins featuring analog switch function

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.

4. Refer to Section 3.10.1: Power supply schemes.

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

MSv67871V3

Sample-and-hold ADC converter

Converter

Cparasitic

(2)

Ilkg

(3)

CADC

VDDA

(4)

RAIN

(1)

VAIN

RADC

VREF+

(4)

VSSA

I/O

analog

switch

Sampling

switch with

multiplexing

VSS

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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