NXP 60 x 8 LCD segment driver PCA9620 for automotive & industrial

PC
A9
620
NXP 60 x 8 LCD segment
driver PCA9620 for
automotive & industrial
LCD high-drive segment driver
for automotive & industrial applications
With the PCA9620, NXP expands its proven portfolio of LCD segment drivers into high-end
applications. Optimized for use in automotive and demanding industrial applications, it delivers
the kinds of features typically associated with larger dot-matrix drivers in a single LQFP80 package.
Key features
`` AEC-Q100 grade 2 compliant qualification
`` Extended operating temp range (-40 to +105 °C)
`` Integrated charge pump for on-chip, factory-calibrated `
VLCD voltage generation up to 9.0 V
`` Integrated sensor for on-chip VLCD temp compensation and
digital temp read-back
`` Software-programmable frame frequency: 60 to 300 Hz,
step size 10 Hz, factory calibrated
`` Software programmable backplane drive configuration:
static, 2, 4, 6, or 8 backplane multiplexing
`` Software-programmable bias voltage generation: 1/2, 1/3,
and 1/4 bias
`` Software-programmable inversion scheme for LCD driving
waveforms: frame or line inversion
`` 480-bit display data RAM to drive up to 480 display
elements of any shape including dot matrices and icons
`` Software-programmable linear temp compensation of VLCD:
8 different temp slopes, 4 temp regions
`` Wide LCD supply range: from 2.5 V for low-threshold LCD
up to 9.0 V for high-threshold Twisted Nematic and Vertical
Alignment LCD
Applications
`` Automotive
- Instrument cluster
- Car radio
- Climate control units
`` Industrial
- Machine control systems
- Measuring equipment
`` Signage
- Information boards
- Panels
Housed in a single LQFP80 package, this rugged device
supports demanding automotive and industrial applications. It
has a AEC-Q100 grade 2 compliant qualification, and supports
60 x 8 LCD displays with up to 480 elements.
The device can drive almost any LCD with low multiplex
rates. It generates the drive signals for static or multiplexed
LCD containing up to 8 backplanes, 60 segments, and
480 elements. The PCA9620 is compatible with most
microcontrollers and communicates via the two-line
bidirectional 400 kHz I2C-bus. Communication overhead
is minimized using an on-chip display RAM with autoincremented addressing and display memory switching.
The integrated charge pump (booster circuitry) of the PCA9620
permits the programming of any LCD supply voltage in the
range from 2.5 to 9.0 V. Therewith, a single (e.g. 3.3 V) external
supply allows to generate an LCD supply voltage of up to `
9.0 V. The corresponding LCD bias voltages are generated by
the internal bias voltage generator.
regions (parameters MA, MB, MC, and MD), whereas for
each coefficient one of eight different slopes can be selected
(parameters SLA, SLB, SLC, and SLD).
The PCA9620 is specifically designed for driving high display
loads at high frame frequencies. To illustrate the driving
capability of the PCA9620, two display cell technologies are
used as examples: Twisted Nematic and Black Nematic cells.
Compared to Twisted Nematic cells, Black Nematic cells have
a smaller capacitive load in relation to the display area but
should be driven at a higher frame frequency.
The PCA9620 features an LCD supply voltage temperature
compensation circuitry that makes it possible to automatically
offset the temperature dependency of the liquid crystal
material. The system is based on a temperature sensor
and four equally sized temperature regions. A different
temperature coefficient can be applied to each of these
As an example, on one hand the PCA9620 is capable of driving
a Black Nematic display with a display area of up to 140 cm2.
On the other hand, the PCA9620 can also drive a Twisted
Nematic display with a display area of up to 35 cm2.
Temp regions used for LCD supply voltage temp compensation
PCA9620 driving capability
SLB
SLA
SLC
SLD
TD[7:0]
0h
20h
60h
40h
7Fh
VLCD with temperature
compensation (V)
zero offset
at 20 °C
MA
MB
-40
-10
MC
20
MD
79
Temperature (°C)
50
PCA9620 block diagram
PCA9620 operating characteristics
VLCD
BP0 to BP7
S0 to S59
BACKPLANE
OUTPUTS
DISPLAY SEGMENT OUTPUTS
60
VDD2
LCD
VOLTAGE
SELECTOR
CHARGE
PUMP
(VOLTAGE
MULTIPLIER)
DISPLAY
CONTROL
SCL
SDA
OUTPUT BANK SELECT
LCD BIAS
GENERATOR
VSS
CLK
DISPLAY REGISTER
TEMPERATURE
SENSOR
CLOCK SELECT
AND TIMING
OSCILLATOR
POWER-ON
RESET
INPUT
FILTERS
A1
2.5 V to 5.5 V
LCD supply voltage range
2.5 V to 9.0 V
Power-down supply current
1 µA
Temperature range
-40 °C to +105 °C
Frame frequency range
60 Hz to 300 Hz
Temperature accuracy
±4 °C
DISPLAY RAM
PCA9620
PCA9620 ordering information
COMMAND
DECODER
WRITE DATA
CONTROL
DATA POINTER,
AUTO INCREMENT
I2C-BUS
CONTROLLER
A0
Supply voltage range
VDD1
Type
Package tape and reel
Qualification
Version
PCA9620H
LQFP80, plastic low profile quad flat
package; 80 leads, body `
12 x 12 x 1.4 mm
AEC-Q100 grade 2
1
T1 T2 T3
www.nxp.com
© 2011 NXP Semiconductors N.V.
All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The
Date of release: May 2011
information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and
Document order number: 9397 750 17118
may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof
Printed in the Netherlands
does not convey nor imply any license under patent- or other industrial or intellectual property rights.