PCF2113X datasheet(31/72 Pages) PHILIPS

31 / 72 page

2001 Dec 19

Philips Semiconductors

Product speciﬁcation

LCD controllers/drivers

PCF2113x

9.8

Display conﬁguration

Bit P

P = 0: default.

P = 1: mirrors the column data.

Bit Q

Q = 0: default.

Q = 1: mirrors the row data.

9.9

Temperature control

Default is TC1 = 0 and TC2 = 0. Selects the default

temperature coefficient for the internally generated VLCD

(see Table 10).

The ranges for TC are given in Chapter 13.

Table 10 TC1 and TC2 selection of VLCD temperature

coefﬁcient

9.10

Set VLCD

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

registers, VA and VB hold VLCD values for the character

mode and the icon mode respectively. 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.

9.11

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

TC1

TC2

DESCRIPTION

VLCD temperature coefﬁcient 0

VLCD temperature coefﬁcient 1

VLCD temperature coefﬁcient 2

VLCD temperature coefﬁcient 3

ORIGINAL MODE

ALTERNATIVE MODE

Character mode

Icon mode (control bit IM)

Display on

Display off (control bit D)

VLCD generator operating

Direct mode

Any mode

power-down (PD pin)

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