STM32L151C6U6 datasheet(105/131 Pages) STMICROELECTRONICS

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DocID17659 Rev 9

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STM32L151x6/8/B, STM32L152x6/8/B

Electrical characteristics

105

6.3.21

LCD controller (STM32L152xx only)

The STM32L152xx 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 62. 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, not tested in production.

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. Based on characterization, not tested in production.

Segment/Common level voltage error

TA = -40 to 85 °C

± 50

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