PCA9620H/Q900/1,51 NXP Semiconductors, PCA9620H/Q900/1,51 Datasheet - Page 36

• Manufacturer Part Number: PCA9620H/Q900/1,51
• Description: LCD Drivers 480 SEGMENT LCD SEGMENT DRIVER
• Manufacturer: NXP Semiconductors

Specifications of PCA9620H/Q900/1,51

• Number Of Segments: 60
• Maximum Clock Frequency: 14500 Hz
• Operating Supply Voltage: 2.5 V to 5.5 V
• Maximum Power Dissipation: 400 mW
• Maximum Operating Temperature: + 105 C
• Package / Case: LQFP-80
• Maximum Supply Current: 200 uA
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 935291899518

NXP Semiconductors
PCA9620
Product data sheet
7.4.8 Temperature compensation of V
This delay may cause undesired effects at start-up when the environment temperature
may be different than the reset value of the PCA9620 which is 20 °C. In this case it takes
up to 30 s till the correct measured temperature value will be available. A control bit, TFE,
is implemented to enable or disable the digital temperature filter. This bit is set logic 0 by
default which means that the filter is disabled and the unfiltered environment temperature
value is available to calculate the desired V
Due to the temperature dependency of the liquid crystal viscosity the LCD controlling
voltage V
contrast. The temperature behavior of the liquid comes from the LCD manufacturer. The
slope has to be set to compensate for the liquid behavior. Internal temperature
compensation may be enabled via bit TCE.
The ambient temperature range is split up into four equally sized regions and a different
temperature coefficient can be applied to each (see
selected from a choice of eight different slopes. Each one of these coefficients (see
Table
commands (see
Fig 28. Temperature measurement delay
(1) Environment temperature, T1 (°C).
(2) Measured temperature, T2 (°C).
(3) Temperature deviation, ΔT = T2 − T1.
29) may be independently selected via the temp-comp-SLA to temp-comp-SLD
(°C)
T
50
40
30
20
10
LCD
0
0
might have to be adjusted at different temperatures to maintain optimal
(1)
(2)
(3)
All information provided in this document is subject to legal disclaimers.
Table 4 on page
Rev. 1 — 9 December 2010
40
5).
LCD
Universal LCD driver for low multiplex rates
LCD
80
.
Figure
29). Each coefficient can be
120
t (s)
PCA9620
© NXP B.V. 2010. All rights reserved.
001aal393
160
16
12
8
4
0
−4
(°C)
ΔT
(3)
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