Datasheet

1. General description
The PCA8547 is a fully featured Liquid Crystal Display (LCD)
1
driver, specifically designed
for high-contrast Vertical Alignment (VA) LCD with multiplex rates up to 1:4. It generates
the drive signals for any static or multiplexed LCD containing up to four backplanes,
44 segments, and up to 176 elements. The PCA8547 features an internal charge pump
with internal capacitors for on-chip generation of the LCD driving voltage. To ensure an
optimal and stable contrast over the full temperature range, the PCA8547 offers a
programmable temperature compensation of the LCD supply voltage. The PCA8547 can
be easily connected to a microcontroller by either the two-line I
2
C-bus (PCA8547A) or a
three-line bidirectional SPI-bus (PCA8547B).
For a selection of NXP LCD segment drivers, see Table 43 on page 67
.
2. Features and benefits
 AEC Q100 compliant for automotive applications.
 Low-power single-chip LCD controller and driver
 176 elements allowing to drive:
 up to 22 7-segment alphanumeric characters
 up to 11 14-segment alphanumeric characters
 Selectable backplane drive configuration: static, 2, or 4 backplane multiplexing
 Software programmable internal charge pump for on-chip LCD voltage generation up
to 9 V with internal capacitors
 400 kHz I
2
C-bus interface (PCA8547A)
 5 MHz SPI-bus interface (PCA8547B)
 Programmable temperature compensation of V
LCD
with both, negative and positive
slopes in four temperature regions
 Selectable display bias configuration
 Wide range for digital power supply: from 1.8 V to 5.5 V
 Wide LCD supply range: from 2.5 V for low threshold LCDs and up to 9.0 V for high
threshold twisted nematic LCDs
 On-chip RAM for display data storage arranged in two banks
 Display memory bank switching
 Programmable frame frequency in the range of 60 Hz to 300 Hz in steps of 10 Hz;
factory calibrated
 Integrated temperature sensor with temperature readout
 On chip calibration of internal oscillator frequency and V
LCD
PCA8547
4 x 44 automotive LCD driver with integrated charge pump
Rev. 1 — 21 January 2014 Product data sheet
1. The definition of the abbreviations and acronyms used in this data sheet can be found in Section 20.