PCF2119FUSLASH2 datasheet(32/68 Pages) PHILIPS

32 / 68 page

2003 Jan 30

Philips Semiconductors

Product speciﬁcation

LCD controllers/drivers

PCF2119X

9.5

Normal/icon mode operation

9.6

Direct mode

When DM = 0, the chip is not in direct mode. Either the

internal voltage generator or an external voltage may be

used to achieve the necessary VLCD value.

When DM = 1, the chip is in direct mode. The internal

voltage generator is turned off and the VLCD output is

directly connected to the HVgen supply voltage VDD2.

The direct mode can be used to reduce the current

consumption when the required VLCD output voltage 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).

9.7

Voltage multiplier control

S[1:0]

A software configurable voltage multiplier is incorporated

and can be set via ‘Set HVgen stages’ command.

The voltage multiplier control can be used to reduce

current consumption by disconnecting internal voltage

multiplier stages (depending on the required VLCD output

voltage).

9.8

Screen conﬁguration

L: default is L = 0.

L = 0: the two halves of a split screen are connected in a

standard way i.e. column 1/81, 2/82 to 80/160.

L = 1: the two halves of a split screen are connected in a

mirrored way i.e. column 1/160, 2/159 to 80/81. This

allows single layer PCB or glass layout.

9.9

Display conﬁguration

P, Q: default is P, Q = 0.

P = 1: mirrors the column data.

Q = 1: mirrors the row data.

9.10

TC1 and TC2

Default is TC1 and TC2 = 0. This selects the default

temperature coefficient for the internally generated VLCD.

TC1 and TC2 = 10, 01 and 11 selects alternative

temperature coefficients 1, 2 and 3 respectively.

9.11

Set VLCD

The VLCD value is programmed by instruction. Two on-chip

registers hold VLCD values for the character mode and the

icon mode respectively (VA and VB). The generated VLCD

value is independent of VDD, allowing battery operation of

the chip.

VLCD programming:

1. Send ‘function set’ instruction with H = 1

2. Send ‘set VLCD’ instruction to write to voltage register:

a) DB7, DB6 = 10: DB5 to DB0 are VLCD of character

mode (VA)

b) DB7, DB6 = 11: DB5 to DB0 are VLCD of icon mode

(VB)

c) DB5 to DB0 = 000000 switches VLCD generator off

(when selected)

d) During ‘display off’ and power-down the VLCD

generator is also disabled.

3. Send ‘function set’ instruction with H = 0 to resume

normal programming.

9.12

Reducing current consumption

Reducing current consumption can be achieved by one of

the options given in Table 11.

When VLCD lies outside the VDD range and must be

generated, it is usually more efficient to use the on-chip

generator than an external regulator.

Table 11 Reducing current consumption

Table 12 Use of the VA and VB registers

CONDITION

VLCD

character mode

generates VA

icon mode

generates VB

ORIGINAL MODE

ALTERNATIVE MODE

Character mode

icon mode (control bit IM)

Display on

display off (control bit D)

HV generator operating

direct mode

Any mode

power-down (PD pad)

MODE

Normal operation VLCD character

mode

VLCD icon mode

PCF2119FU/2 Datasheet(PDF) 32 Page - NXP Semiconductors

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