PCA9620H NXP [NXP Semiconductors], PCA9620H Datasheet - Page 31

• Manufacturer Part Number: PCA9620H
• Description: Universal LCD driver for low multiplex rates
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
PCA9620
Product data sheet
Fig 23. V
TEMPERATURE
LCD
READOUT
generation including temperature compensation
7.4.3 V
When eight backplanes are provided in the LCD, the 1:8 multiplex drive mode applies, as
shown in
V
the internal charge pump is used, the programmed V
charge pump generates a V
The charge pump can be enabled or disabled with the CPE bit (see
With bit CPC the charge pump multiplier setting can be configured.
The final value of V
of the temperature compensation block, VT[7:0]. The system is shown in
In
compensated temperature term.
Table 27.
Figure 24
V
Symbol
m
n
1. VPR[7:0] is the binary value of the programmed voltage.
2. VT[7:0] is the binary value of the temperature compensated voltage. Its value comes
3. m and n are fixed values (see
TD
LCD
LCD
LCD
Equation 6
from the temperature compensation block and is a two’s complement which has the
value 0h at 20 °C.
8
can be generated and controlled on the chip by using software commands. When
generation
=
[
Figure 21
VPR 7:0
shows how V
Parameters of V
−40
the main parameters are the programmed digital value term and the
[
SLA
All information provided in this document is subject to legal disclaimers.
]
LCD
and
+
SLB
0
VT 7:0
Rev. 1 — 9 December 2010
+20
is a combination of the programmed VPR[7:0] value and the output
LCD
Figure
0 OFFSET
[
SLC
LCD
TEMPERATURE
changes with the programmed value of VPR[7:0].
LCD
+50
]
]
generation
Value
3
0.03
×
SLD
22.
of up to 3 × V
n
+80
+
Table
VPR[7:0]
m
27).
Universal LCD driver for low multiplex rates
DD2
8
.
LCD
8
is available on pin V
n
Unit
V
V
Table 8 on page
m
PCA9620
© NXP B.V. 2010. All rights reserved.
013aaa257
Figure
V
LCD
LCD
23.
. The
31 of 71
7).
(6)