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PDF PCA9620 Data sheet ( Hoja de datos )
| Número de pieza | PCA9620 | |
| Descripción | Universal LCD driver | |
| Fabricantes | NXP Semiconductors | |
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PCA9620
Universal LCD driver for low multiplex rates
Rev. 1 — 9 December 2010
Product data sheet
1. General description
The PCA9620 is a peripheral device which interfaces to almost any Liquid Crystal Display
(LCD)1 with low multiplex rates. It generates the drive signals for any static or multiplexed
LCD containing up to eight backplanes, 60 segments, and up to 480 elements. The
PCA9620 is compatible with most microprocessors or microcontrollers and communicates
via a two-line bidirectional I2C-bus. Communication overheads are minimized using a
display RAM with auto-incremented addressing and display memory switching. The
PCA9620 features an internal charge pump with internal capacitors for on-chip generation
of the LCD driving voltages.
AEC Q100 grade 2 compliant for automotive applications.
2. Features and benefits
Low power consumption
Extended operating temperature range from −40 °C to +105 °C
60 segments and 8 backplanes allowing to drive:
up to 60 7-segment alphanumeric characters
up to 30 14-segment alphanumeric characters
any graphics of up to 480 elementswww.DataSheet.net/
480 bit RAM for display data storage
Selectable backplane drive configuration: static, 2, 4, 6, or 8 backplane multiplexing
Programmable internal charge pump for on-chip LCD voltage generation up to
3 × VDD2
400 kHz I2C-bus interface
Selectable linear temperature compensation of VLCD
Selectable display bias configuration
Wide range for digital and analog power supply: from 2.5 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 (automobile) twisted nematic LCDs
Display memory bank switching in static, duplex, and quadruplex drive modes
Programmable frame frequency in steps of 10 Hz in the range of 60 Hz to 300 Hz;
factory calibrated with a tolerance of ±15 % covering the whole temperature and
voltage range
Selectable inversion scheme for LCD driving waveforms: frame or line inversion
Integrated temperature sensor with temperature readout
On chip calibration of internal oscillator frequency and VLCD
1. The definition of the abbreviations and acronyms used in this data sheet can be found in Section 15 on page 65.
Datasheet pdf - http://www.DataSheet4U.co.kr/
1 page  
NXP Semiconductors
PCA9620
Universal LCD driver for low multiplex rates
7. Functional description
The PCA9620 is a versatile peripheral device designed to interface any microprocessor or
microcontroller to a wide variety of LCDs. It can directly drive any static or multiplexed
LCD containing up to 480 elements.
7.1 Commands of PCA9620
The PCA9620 is controlled by 22 commands, which are defined in Table 4. Any other
combinations of operation code bits that are not mentioned in this document may lead to
undesired operation modes of PCA9620.
Table 4. Commands of PCA9620
Command name Bits
76543210
initialize
00111010
OTP-refresh
11010000
oscillator-ctrl
1 1 0 0 1 1 COE OSC
charge-pump-ctrl 1 1 0 0 0 0 CPE CPC
temp-msr-ctrl
1 1 0 0 1 0 TCE TME
temp-comp-SLA 0 0 0 1 1 SLA[2:0]
temp-comp-SLB 0 0 1 0 0 SLB[2:0]
temp-comp-SLC 0 0 1 0 1 SLC[2:0]
temp-comp-SLD 0 0 1 1 0 SLD[2:0]www.DataSheet.net/
set-VPR-MSB
0 1 0 0 VPR[7:4]
set-VPR-LSB
0 1 0 1 VPR[3:0]
display-enable 0 0 1 1 1 0 0 E
set-MUX-mode
0
0
0
0
0
M[2:0]
set-bias-mode
1 1 0 0 0 1 B[1:0]
load-data-pointer 1 0 P[5:0]
frame-frequency 0 1 1 F[4:0]
input-bank-select 0 0 0 0 1 IB[2:0]
output-bank-select 0 0 0 1 0 OB[2:0]
write-RAM-data B[7:0]
temp-read
TD[7:0]
invmode_CPF_ctrl 1 1 0 1 0 1 LF CPF
temp-filter
1 1 0 1 0 0 1 TFE
Reference
Section 7.1.1
Section 7.1.2
Section 7.1.3
Section 7.1.4
Section 7.1.5
Table 29
Section 7.1.6
Section 7.1.7
Section 7.1.8
Section 7.1.9
Section 7.1.10
Section 7.1.11
Section 7.1.12.1
Section 7.1.13
Section 7.1.14,
Section 7.4.7
Section 7.1.15
Section 7.1.16
7.1.1 Command: initialize
This command generates a chip wide reset which resets all command values to their
default values (see Table 25 on page 15). It must be sent to the PCA9620 after power-on.
After this command is sent, it is possible to send additional commands without the need to
re-initialize the interface. Reset takes 100 ns to complete.
For further information see Section 7.3 on page 14.
PCA9620
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 9 December 2010
© NXP B.V. 2010. All rights reserved.
5 of 71
Datasheet pdf - http://www.DataSheet4U.co.kr/
5 Page 
NXP Semiconductors
PCA9620
Universal LCD driver for low multiplex rates
7.1.13 Command: write-RAM-data
The write-RAM-data command writes data byte-wise to the RAM. After Power-On Reset
(POR) the RAM content is random and should be brought to a defined status by clearing it
(setting it logic 0).
Table 20. Write-RAM-data - write RAM data command bit description[1]
Bit Symbol
Value
Description
7 to 0 B[7:0]
00000000 to writing data byte-wise to RAM
11111111
[1] For this command bit RS of the control byte has to be set logic 1 (see Table 33 on page 52).
More information about the display RAM can be found in Section 7.9 on page 40.
7.1.14 Command: temp-read
The temp-read command allows reading out the temperature values measured by the
internal temperature sensor.
Table 21. Temp-read - temperature readout command bit description[1]
For further information, see Table 9 on page 7 and Section 7.4.7 on page 35.
Bit Symbol
Value
Description
7 to 0 TD[7:0]
00000000 to readout representing the digital temperature
11111111
[1] For this command bit R/W of the I2C-bus slave address byte has to be set logic 1 (see Table 32 on
page 51).
www.DataSheet.net/
7.1.15 Command: invmode_CPF_ctrl
The invmode_CPF_ctrl command allows changing the drive scheme inversion mode and
the charge pump frequency.
The waveforms used to drive LCD displays inherently produce a DC voltage across the
display cell. The PCA9620 will compensate for the DC voltage by inverting the waveforms
on alternate frames or alternate lines. The choice of compensation method is determined
with the LF bit.
Table 22. Invmode_CPF_ctrl - inversion mode and charge pump frequency prescaler
command bit description
Bit Symbol
Value
Description
7 to 2 -
1101 01
fixed value
1 LF
set inversion mode
0[1] line inversion mode
1 frame inversion mode
0 CPF
set charge pump oscillator frequency
0[1] fosc(cp) ~ 1 MHz
1 fosc(cp) ~ 500 kHz
[1] Default value.
PCA9620
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 9 December 2010
© NXP B.V. 2010. All rights reserved.
11 of 71
Datasheet pdf - http://www.DataSheet4U.co.kr/
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