PIC16LF1906T-I/SO View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16LF1906T-I/SO

28/40/44-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt XLP Technology

Microchip Technology 

PIC16LF1904/6/7

19.3 LCD Bias Voltage Generation

The LCD module can be configured for one of three

bias types:

• Static Bias (2 voltage levels: VSS and VLCD)

• 1/2 Bias (3 voltage levels: VSS, 1/2 VLCD and

VLCD)

• 1/3 Bias (4 voltage levels: VSS, 1/3 VLCD,

2/3 VLCD and VLCD)

TABLE 19-2: LCD BIAS VOLTAGES

Static Bias 1/2 Bias

1/3 Bias

LCD Bias 0

LCD Bias 1

LCD Bias 2

LCD Bias 3

VSS

—

—

VLCD3

VSS

1/2 VDD

1/2 VDD

VLCD3

VSS

1/3 VDD

2/3 VDD

VLCD3

So that the user is not forced to place external compo-

nents and use up to three pins for bias voltage generation,

internal contrast control and an internal reference ladder

are provided internally to the PIC16LF1904/6/7. Both of

these features may be used in conjunction with the exter-

nal VLCD<3:1> pins, to provide maximum flexibility. Refer

to Figure 19-3.

FIGURE 19-3:

LCD BIAS VOLTAGE GENERATION BLOCK DIAGRAM

VDD

LCDIRE

LCDA

Power Mode Switching

(LRLAP or LRLBP)

A2

2B 2

VLCD3

VLCD3PE

LCDCST<2:0>

LCDA

lcdbias3

VLCD2

VLCD2PE

VLCD1

VLCD1PE

lcdbias2

BIASMD

lcdbias1

lcdbias0

 2011 Microchip Technology Inc.

Preliminary

DS41569A-page 193

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