pcf2119x-2 NXP Semiconductors, pcf2119x-2 Datasheet - Page 29

• Manufacturer Part Number: pcf2119x-2
• Description: Controllers/drivers
• Manufacturer: NXP Semiconductors

Philips Semiconductors
9.5
9.6
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 V
When DM = 1, the chip is in direct mode. The internal
voltage generator is turned off and the V
directly connected to the HVgen supply voltage V
The direct mode can be used to reduce the current
consumption when the required V
close to the V
icon mode or in Mux 1:9 (depending on LCD liquid
properties).
9.7
S[1:0}
A software configurable voltage multiplier is incorporated
and can be set via the “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 V
voltage).
9.8
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
P, Q: default is P, Q = 0.
P = 1: mirrors the column data.
Q = 1: mirrors the row data.
28. August 2000
LCD controllers/drivers
IM
0
1
Normal/icon mode operation
Direct mode
Voltage multiplier control
Screen configuration
Display configuration
character mode
icon mode
DD2
CONDITION
supply voltage. This can be the case in
LCD
LCD
generates V
generates V
value.
output voltage is
LCD
V
output is
LCD
LCD
A
B
DD2
output
.
29
9.10
Default is TC1 and TC2 = 0. This selects the default
temperature coefficient for the internally generated V
TC1 and TC2 = 10, 01 and 11 selects alternative
temperature coefficients 1, 2 and 3 respectively.
9.11
The V
registers hold V
icon mode respectively (V
value is independent of V
the chip.
V
1. Send ‘function set’ instruction with H = 1
2. Send ‘set V
3. Send ‘function set’ instruction with H = 0 to resume
9.12
Reducing current consumption can be achieved by one of
the options given in Table 11.
When V
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 V
Character mode
Display on
HV generator operating Direct mode
Any mode
Normal operation V
LCD
ORIGINAL MODE
a) DB7, DB6 = 10: DB5 to DB0 are V
b) DB7, DB6 = 11: DB5 to DB0 are V
c) DB5 to DB0 = 000000 switches V
d) During ‘display off’ and power-down the V
normal programming.
programming:
LCD
MODE
TC1 and TC2
Set V
Reducing current consumption
mode (V
(V
(when selected)
generator is also disabled.
LCD
B
value is programmed by instruction. Two on-chip
)
lies outside the V
LCD
LCD
LCD
A
)
’ instruction to write to voltage register:
values for the character mode and the
mode
LCD
A
and V
DD
character
A
Icon mode (control bit IM)
Display off (control bit D)
Power-down (PD pad)
V
and V
, allowing battery operation of
A
DD
B
ALTERNATIVE MODE
registers
range and must be
B
). The generated V
PCF2119x-2
Product specification
V
LCD
LCD
LCD
LCD
generator off
of icon mode
icon mode
of character
V
B
LCD
LCD
LCD
.