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PCF2113 Datasheet PDF : 65 Pages
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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).
Table 15.
Bit TC1
0
1
0
1
TC1 and TC2 selection of VLCD temperature coefficient
Bit TC2
VLCD temperature coefficient TC (typical values)
0
TC = −0.16 %/K
0
TC = −0.18 %/K
1
TC = −0.21 %/K
1
TC = −0.24 %/K
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 16. Reducing current consumption
Original mode
Character mode
Display on
VLCD generator operating
Any mode
Alternative mode
Icon mode (control bit M)
display off (control bit D)
Direct mode
Power-down mode (PD pin)
PCF2113_FAM_4
Product data sheet
Rev. 04 — 4 March 2008
© NXP B.V. 2008. All rights reserved.
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