STM32WB15CC datasheet(108/127 Pages) STMICROELECTRONICS

108 / 127 page

Electrical characteristics

STM32WB15CC

108/127

DS13258 Rev 4

Figure 23. Typical connection diagram when using the ADC

with FT/TT pins featuring analog switch function

1. Refer to Table 69: 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 (refer to Table 64: 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 64: I/O static characteristics for the values of Ilkg.

4. Refer to Figure 13: Power supply scheme.

General PCB design guidelines

Power supply decoupling has to be performed as shown in Figure 13: Power supply

scheme. The 10 nF capacitor must be ceramic (good quality), placed as close as possible to

the chip.

6.3.20

Comparator 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 72. COMP characteristics(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VDDA

Analog supply voltage

1.62

3.6

VIN

Comparator



input voltage range

-0

VDDA

VBG(2)

Scaler input voltage

VREFINT

VSC

Scaler offset voltage

±5

±10

IDDA(SCALER)

Scaler static consumption

from VDDA

BRG_EN=0 (bridge disable)

200

300

BRG_EN=1 (bridge enable)

0.8

µA

tSTART_SCALER Scaler startup time

100

200

µs

tSTART

Comparator startup time

to reach propagation

delay specification

High-speed

mode

VDDA ≥ 2.7 V

µs

VDDA < 2.7 V

Medium mode

VDDA ≥ 2.7 V

VDDA < 2.7 V

Ultra-low-power mode

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