STM32WB35CCU6ATR datasheet(156/193 Pages) STMICROELECTRONICS

156 / 193 page

Electrical characteristics

STM32WB55xx STM32WB35xx

156/193

DS11929 Rev 10

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

LCD external voltage

3.6

VLCD0

LCD internal reference voltage 0

2.62

VLCD1

LCD internal reference voltage 1

2.76

VLCD2

LCD internal reference voltage 2

2.89

VLCD3

LCD internal reference voltage 3

3.04

VLCD4

LCD internal reference voltage 4

3.19

VLCD5

LCD internal reference voltage 5

3.32

VLCD6

LCD internal reference voltage 6

3.46

VLCD7

LCD internal reference voltage 7

3.62

Cext

VLCD external capacitance

Buffer OFF



(BUFEN=0 is LCD_CR register)

0.2

μF

Buffer ON



(BUFEN=1 is LCD_CR register)

1-2

ILCD(2)

Supply current from VDD at

VDD = 2.2 V

Buffer OFF



(BUFEN=0 is LCD_CR register)

-3-

μA

Supply current from VDD at

VDD = 3.0 V

Buffer OFF



(BUFEN=0 is LCD_CR register)

-1.5

IVLCD

Supply current from VLCD

(VLCD = 3 V)

Buffer OFF



(BUFFEN = 0, PON = 0)

-0.5

μA

Buffer ON



(BUFFEN = 1, 1/2 Bias)

-0.6

Buffer ON



(BUFFEN = 1, 1/3 Bias)

-0.8

Buffer ON



(BUFFEN = 1, 1/4 Bias)

-1-

RHN

Total High resistor value for Low drive resistive network

5.5

MΩ

RLN

Total Low resistor value for High drive resistive network

240

kΩ

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