STM32L151XE datasheet(113/134 Pages) STMICROELECTRONICS

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DocID025433 Rev 8

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STM32L151xE STM32L152xE

Electrical characteristics

113

6.3.22

LCD controller

The device embeds 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 64. LCD controller characteristics

Symbol

Parameter

Min

Typ

Max

Unit

VLCD

LCD external voltage

3.6

VLCD0

LCD internal reference voltage 0

2.6

VLCD1

LCD internal reference voltage 1

2.73

VLCD2

LCD internal reference voltage 2

2.86

VLCD3

LCD internal reference voltage 3

2.98

VLCD4

LCD internal reference voltage 4

3.12

VLCD5

LCD internal reference voltage 5

3.26

VLCD6

LCD internal reference voltage 6

3.4

VLCD7

LCD internal reference voltage 7

3.55

Cext

VLCD external capacitance

0.1

µF

ILCD(1)

1. LCD enabled with 3 V internal step-up active, 1/8 duty, 1/4 bias, division ratio= 64, all pixels active, no LCD

connected.

Supply current at VDD = 2.2 V

3.3

µA

Supply current at VDD = 3.0 V

3.1

RHtot(2)

2. Guaranteed by design.

Low drive resistive network overall value

5.28

6.6

7.92

RL(2)

High drive resistive network total value

192

240

288

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

ΔVxx(3)

3. Guaranteed by characterization results.

Segment/Common level voltage error

TA = -40 to 105 ° C

± 50

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