STM32WB35CEU6A datasheet(152/196 Pages) STMICROELECTRONICS

152 / 196 page

Electrical characteristics

STM32WB55xx STM32WB35xx

152/196

DS11929 Rev 14

Figure 30. Typical connection diagram using the ADC

1. Refer to Table 77: 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 72: I/O static characteristics for the value of the pad capacitance). A high

Cparasitic value will downgrade conversion accuracy. To remedy this, fADC should be reduced.

3. Refer to Table 72: I/O static characteristics for the values of Ilkg.

4. Refer to Figure 16 and Figure 17.

General PCB design guidelines

Power supply decoupling has to be performed as shown in Figure 16: Power supply scheme

(all packages except UFBGA129 and WLCSP100). The 10 nF capacitor needs to be

ceramic (good quality), placed as close as possible to the chip.

6.3.21

Voltage reference buffer 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. VREFBUF characteristics(1)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VDDA

Analog supply

voltage

Normal mode

VRS = 0

2.4

3.6

VRS = 1

2.8

3.6

Degraded mode(2)

VRS = 0

1.65

2.4

VRS = 1

1.65

2.8

VREFBUF_

OUT

Voltage

reference output

Normal mode(3)

VRS = 0

2.046

2.048

2.049

VRS = 1

2.498

2.500

2.502

Degraded mode(2)

VRS = 0

VDDA-150 mV

2.049

VRS = 1

VDDA-150 mV

2.502

TRIM

Trim step

resolution

±0.05

±0.1

Load capacitor

0.5

1.5

µF

esr

Equivalent

series resistor

of Cload

Ω

STM32WB35CEU6A Datasheet(PDF) 152 Page - STMicroelectronics

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