PCF2113AU Просмотр технического описания (PDF) - Philips Electronics
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PCF2113AU Datasheet PDF : 72 Pages
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Philips Semiconductors
LCD controllers/drivers
Product specification
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
TC1 TC2
DESCRIPTION
0
0 VLCD temperature coefficient 0
1
0 VLCD temperature coefficient 1
0
1 VLCD temperature coefficient 2
1
1 VLCD temperature coefficient 3
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
ORIGINAL MODE
Character mode
Display on
VLCD generator operating
Any mode
ALTERNATIVE MODE
Icon mode (control bit IM)
Display off (control bit D)
Direct mode
power-down (PD pin)
2001 Dec 19
31
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