STM32L4A6VG datasheet(213/282 Pages) STMICROELECTRONICS

213 / 282 page

DS11584 Rev 8

213/282

STM32L4A6xG

Electrical characteristics

252

6.3.25

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 90. 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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