STM32WB55 datasheet(152/193 Pages) STMICROELECTRONICS

152 / 193 page

Electrical characteristics

STM32WB55xx STM32WB35xx

152/193

DS11929 Rev 11

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.

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

MS33900V5

Sample and hold ADC converter

12-bit

converter

Cparasitic

(2)

Ilkg

(3)

CADC

VDDA

RAIN

(1)

VAIN

AINx

RADC

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

VRS = 0

2.046

2.048

2.049

VRS = 1

2.498

2.5

2.502

Degraded mode(2)

VRS = 0

VDDA-150 mV

VDDA

VRS = 1

VDDA-150 mV

VDDA

TRIM

Trim step

resolution

±0.05

±0.1

Load capacitor

0.5

1.5

µF

esr

Equivalent

series resistor



of Cload

Ω

Iload

Static load

current

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