PCF2113X datasheet(35/65 Pages) NXP

35 / 65 page

PCF2113_FAM_4

Product data sheet

Rev. 04 — 4 March 2008

35 of 65

NXP Semiconductors

PCF2113x

LCD controllers/drivers

10.9 Temperature control

Default is bit TC1 = 0 and bit TC2 = 0. Selects the default temperature coefﬁcient for the

internally generated VLCD (see Table 15).

10.10 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 is

independent of VDD, allowing battery operation of the chip.

10.10.1 VLCD programming

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

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

a. If DB[7:6] = 10, then DB[5:0] represents VLCD of Character mode (VA)

b. If DB[7:6] = 11, then DB[5:0] represents VLCD of Icon mode (VB)

c. DB[5:0] = 00 0000 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

Section 8.1 shows the relation between VLCD and registers VA and VB.

10.11 Reducing current consumption

Reducing current consumption can be achieved by one of the options given in Table 16.

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 15.

TC1 and TC2 selection of VLCD temperature coefﬁcient

Bit TC1

Bit TC2

VLCD temperature coefﬁcient TC (typical values)

TC =

−0.16 %/K

TC =

−0.18 %/K

TC =

−0.21 %/K

TC =

−0.24 %/K

Table 16.

Reducing current consumption

Original mode

Alternative mode

Character mode

Icon mode (control bit M)

Display on

display off (control bit D)

VLCD generator operating

Direct mode

Any mode

Power-down mode (PD pin)

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