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PCA2117DUGS/DA bảng dữ liệu(PDF) 42 Page - NXP Semiconductors

tên linh kiện PCA2117DUGS/DA
Giải thích chi tiết về linh kiện  Automotive LCD driver for character displays
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PCA2117DUGS/DA bảng dữ liệu(HTML) 42 Page - NXP Semiconductors

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PCA2117
All information provided in this document is subject to legal disclaimers.
© NXP Semiconductors N.V. 2015. All rights reserved.
Product data sheet
Rev. 4 — 8 April 2015
42 of 107
NXP Semiconductors
PCA2117
Automotive LCD driver for character displays
The digital temperature filter introduces a certain delay in the measurement of the
temperature. This behavior is illustrated in Figure 24.
8.4.5.2
Temperature adjustment of the VLCD
Due to the temperature dependency of the liquid crystal viscosity, the LCD supply voltage
may have to be adjusted at different temperatures to maintain optimal contrast. The
temperature characteristics of the liquid are provided by the LCD manufacturer. The slope
has to be set to compensate for the liquid behavior. Internal temperature compensation
can be enabled via bit TCE (see Table 32 on page 26).
The ambient temperature range is split up into 4 regions (see Figure 25) and to each a
different temperature coefficient can be applied.
Fig 23. Temperature measurement block with digital temperature filter
(1) Environment temperature, T1 (
C).
(2) Measured temperature, T2 (
C).
(3) Measurement temperature variation,
T
meas =T2  T1.
Fig 24. Temperature measurement delay



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