STM32L476ME datasheet(174/232 Pages) STMICROELECTRONICS

174 / 232 page

Electrical characteristics

STM32L476xx

174/232

DocID025976 Rev 4

6.3.24

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 77. 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

V44

Segment/Common highest level voltage

VLCD

V34

Segment/Common 3/4 level voltage

3/4 VLCD

V23

Segment/Common 2/3 level voltage

2/3 VLCD

V12

Segment/Common 1/2 level voltage

1/2 VLCD

V13

Segment/Common 1/3 level voltage

1/3 VLCD

V14

Segment/Common 1/4 level voltage

1/4 VLCD

Segment/Common lowest level voltage

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