STM32WB55CC datasheet(141/165 Pages) STMICROELECTRONICS

141 / 165 page

DS11929 Rev 3

141/165

STM32WB55xx

Electrical characteristics

152

6.3.25

SMPS step-down converter characteristics

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

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

6.3.26

LCD controller characteristics

The 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 84. SMPS step-down converter characteristics

Symbol

Parameter

Conditions

Min

Typ

Max(1)

Unit

Tsmps_start Startup time from bypass mode

Vddsmps = 3.6 V, Vfbsmps = 1.4 V

TBD

μs

Vddsmps = 2.0 V, Vfbsmps = 1.4 V

TBD

Tsmps_trans Transition time

Vfbsmps from 1.4 to 1.7 V

TBD

mV / μs

Vfbsmps from 1.7 to 1.4 V

TBD

1. Maximum values are provided over the -40 °C to 90 °C temperature range.

Table 85. 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

STM32WB55CC Datasheet(PDF) 141 Page - STMicroelectronics

STM32WB55CC Datasheet(HTML) 141 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL