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PCA8576D 데이터시트 PDF




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부품번호 PCA8576D 기능
기능 Automotive 40 x 4 LCD segment driver
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PCA8576D 데이터시트, 핀배열, 회로
PCA8576D
Automotive 40 x 4 LCD segment driver for low multiplex rates
up to 1:4
Rev. 1 — 4 April 2011
Product data sheet
1. General description
The PCA8576D is a peripheral device which interfaces to almost any Liquid Crystal
Display (LCD) with low multiplex rates. It generates the drive signals for any static or
multiplexed LCD containing up to four backplanes and up to 40 segments. It can be easily
cascaded for larger LCD applications. The PCA8576D is compatible with most
microcontrollers and communicates via the two-line bidirectional I2C-bus. Communication
overheads are minimized by a display RAM with auto-incremented addressing, by
hardware subaddressing and by display memory switching (static and duplex drive
modes).
2. Features and benefits
AEC-Q100 compliant for automotive applications
Single chip LCD controller and driver
Selectable backplane drive configuration: static or 2, 3, 4 backplane multiplexing
Selectable display bias configuration: static, 12 or 13
Internal LCD bias generation with voltage-follower buffers
40 segment drives:
Up to 20 7-segment numeric characters
Up to 10 14-segment alphanumeric characters
Any graphics of up to 160 elements
40 4-bit RAM for display data storage
Auto-incremented display data loading across device subaddress boundaries
Display memory bank switching in static and duplex drive modes
Versatile blinking modes
Independent supplies possible for LCD and logic voltages
Wide power supply range: from 1.8 V to 5.5 V
Wide logic LCD supply range:
From 2.5 V for low-threshold LCDs
Up to 6.5 V for high-threshold twisted nematic LCDs
Low power consumption
400 kHz I2C-bus interface
May be cascaded for large LCD applications (up to 2560 elements possible)
No external components required
Compatible with chip-on-glass and chip-on-board technology
Manufactured in silicon gate CMOS process




PCA8576D pdf, 반도체, 판매, 대치품
NXP Semiconductors
PCA8576D
Automotive 40 x 4 LCD segment driver for low multiplex rates
6.2 Pin description
Table 3. Pin description
Symbol
Pin
PCA8576DU
SDA
1, 58, 59
SCL 2, 3
CLK 5
VDD
SYNC
6
4
OSC
7
A0 to A2
8 to 10
SA0 11
VSS
VLCD
BP0, BP2, BP1,
BP3
12[1]
13
14 to 17
S0 to S39
18 to 57
Description
I2C-bus serial data input and output
I2C-bus serial clock input
external clock input or output
supply voltage
cascade synchronization input or output
internal oscillator enable input
subaddress inputs
I2C-bus address input; bit 0
ground supply voltage
LCD supply voltage
LCD backplane outputs
LCD segment outputs
[1] The substrate (rear side of the die) is connected to VSS and should be electrically isolated.
PCA8576D
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 4 April 2011
© NXP B.V. 2011. All rights reserved.
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PCA8576D 전자부품, 판매, 대치품
NXP Semiconductors
PCA8576D
Automotive 40 x 4 LCD segment driver for low multiplex rates
where the values for n are
n = 1 for static mode
n = 2 for 1:2 multiplex
n = 3 for 1:3 multiplex
n = 4 for 1:4 multiplex
The RMS off-state voltage (Voff(RMS)) for the LCD is calculated with Equation 2:
VoffRMS
=
VLCD
--a---2--------2----a----+-----n---
n  1 + a2
(2)
Discrimination is the ratio of Von(RMS) to Voff(RMS) and is determined from Equation 3:
D = -V----o---n----R---M----S---= ---a-----+-----1------2----+-------n---------1----
VoffRMS
a 12 + n 1
(3)
Using Equation 3, the discrimination for an LCD drive mode of 1:3 multiplex with
12 bias is 3 = 1.732 and the discrimination for an LCD drive mode of 1:4 multiplex with
12 bias is
-----2---1--
3
=
1.528 .
The advantage of these LCD drive modes is a reduction of the LCD full scale voltage VLCD
as follows:
1:3 multiplex (12 bias): VLCD = 6 VoffRMS= 2.449VoffRMS
1:4 multiplex (12 bias): VLCD =
---4--------------3----
3
= 2.309VoffRMS
These compare with VLCD = 3VoffRMSwhen 13 bias is used.
It should be noted that VLCD is sometimes referred as the LCD operating voltage.
7.3.1 Electro-optical performance
Suitable values for Von(RMS) and Voff(RMS) are dependent on the LCD liquid used. The
RMS voltage, at which a pixel will be switched on or off, determine the transmissibility of
the pixel.
For any given liquid, there are two threshold values defined. One point is at 10 % relative
transmission (at Vlow) and the other at 90 % relative transmission (at Vhigh), see Figure 4.
For a good contrast performance, the following rules should be followed:
PCA8576D
Product data sheet
VonRMSVhigh
VoffRMSVlow
(4)
(5)
Von(RMS) and Voff(RMS) are properties of the display driver and are affected by the selection
of a, n (see Equation 1 to Equation 3) and the VLCD voltage.
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 4 April 2011
© NXP B.V. 2011. All rights reserved.
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