STM32WB55CEV7 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STM32WB55CEV7

Multiprotocol wireless 32-bit MCU Arm®-based Cortex®-M4 with FPU, Bluetooth® 5 and 802.15.4 radio solution

STMicroelectronics 

Electrical characteristics

STM32WB55xx STM32WB35xx

6.3.25

SMPS step-down converter characteristics

The SMPS step-down converter characteristic are given at 4 MHz clock, with a 20 mA load

(unless otherwise specified), using a 10 µH inductor and a 4.7 µF capacitor.

6.3.26 LCD controller characteristics

The STM32WB55xx devices embed a built-in step-up converter to provide a constant LCD

reference voltage independently from the VDD voltage. An external capacitor Cext must be

connected to the VLCD pin to decouple this converter.

Table 88. LCD controller characteristics(1)

Symbol

Parameter

Conditions

Min

Typ

Max Unit

VLCD

VLCD0

VLCD1

VLCD2

VLCD3

VLCD4

VLCD5

VLCD6

VLCD7

Cext

ILCD(2)

IVLCD

RHN

RLN

LCD external voltage

-

LCD internal reference voltage 0

-

LCD internal reference voltage 1

-

LCD internal reference voltage 2

-

LCD internal reference voltage 3

-

LCD internal reference voltage 4

-

LCD internal reference voltage 5

-

LCD internal reference voltage 6

-

LCD internal reference voltage 7

-

Buffer OFF 

(BUFEN=0 is LCD_CR register)

0.2

VLCD external capacitance Buffer ON 

(BUFEN=1 is LCD_CR register)

1

Supply current from VDD at Buffer OFF 

VDD = 2.2 V

(BUFEN=0 is LCD_CR register)

-

Supply current from VDD at Buffer OFF 

VDD = 3.0 V

(BUFEN=0 is LCD_CR register)

-

Buffer OFF

(BUFFEN = 0, PON = 0)

-

Buffer ON

Supply current from VLCD (BUFFEN = 1, 1/2 Bias)

-

(VLCD = 3 V)

Buffer ON

(BUFFEN = 1, 1/3 Bias)

-

Buffer ON

(BUFFEN = 1, 1/4 Bias)

-

Total High resistor value for Low drive resistive network

-

Total Low resistor value for High drive resistive network

-

-

2.62

2.76

2.89

3.04

3.19

3.32

3.46

3.62

-

-

3

1.5

0.5

0.6

0.8

1

5.5

240

3.6

-

-

-

-

V

-

-

-

-

2

μF

2

-

μA

-

-

-

μA

-

-

-

MΩ

-

kΩ

156/193

DS11929 Rev 10

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