PCF2119DUSLASH2SLASH2 datasheet(37/79 Pages) NXP

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PCF2119X_5

Product data sheet

Rev. 05 — 13 August 2009

37 of 79

NXP Semiconductors

PCF2119x

LCD controllers/drivers

Remark: In direct mode, no external VLCD is possible.

The direct mode can be used to reduce the current consumption when the required output

voltage VLCDOUT is close to the VDD2 supply voltage. This can be the case in icon mode or

in MUX 1:9 (depending on LCD liquid properties).

10.2.3.4

Temp_ctl

The bit-ﬁeld TC[1:0] selects the temperature coefﬁcient for the internally generated

VLCDOUT (see Table 29).

10.2.3.5

HV_gen

A software conﬁgurable voltage multiplier is incorporated in the VLCD generator and can

be set via the HV_gen command. The voltage multiplier control can be used to reduce

current consumption by disconnecting internal voltage multiplier stages, depending on the

required VLCDOUT output voltage (see Table 31).

Table 28.

Temp_ctl bit description

Bit

Symbol

Value

Description

see Table 10

R/W-

7 to 2

000100

1 to 0

TC[1:0]

00 to 11

temperature coefﬁcient

Table 29.

TC[1:0] selection of VLCD temperature coefﬁcient

TC[1:0]

Typical value

Description

−0.16 %/K

VLCD temperature coefﬁcient 0 (default value)

−0.18 %/K

VLCD temperature coefﬁcient 1

−0.21 %/K

VLCD temperature coefﬁcient 2

−0.24 %/K

VLCD temperature coefﬁcient 3

Table 30.

HV_gen bit description

Bit

Symbol

Value

Description

see Table 10

R/W-

7 to 2

010000

ﬁxed value

1 to 0

S[1:0]

00 to 11

voltage multiplier

Table 31.

Voltage multiplier control bits

S[1:0]

Description

set VLCD generator stages to 1 (2 × voltage multiplier)

set VLCD generator stages to 2 (3 × voltage multiplier)

set VLCD generator stages to 3 (4 × voltage multiplier)

do not use

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