Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.COM

X  

OM4068 Datasheet(PDF) 9 Page - NXP Semiconductors

Part # OM4068
Description  LCD driver for low multiplex rates
Download  28 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

OM4068 Datasheet(HTML) 9 Page - NXP Semiconductors

Back Button OM4068 Datasheet HTML 5Page - NXP Semiconductors OM4068 Datasheet HTML 6Page - NXP Semiconductors OM4068 Datasheet HTML 7Page - NXP Semiconductors OM4068 Datasheet HTML 8Page - NXP Semiconductors OM4068 Datasheet HTML 9Page - NXP Semiconductors OM4068 Datasheet HTML 10Page - NXP Semiconductors OM4068 Datasheet HTML 11Page - NXP Semiconductors OM4068 Datasheet HTML 12Page - NXP Semiconductors OM4068 Datasheet HTML 13Page - NXP Semiconductors Next Button
Zoom Inzoom in Zoom Outzoom out
 9 / 28 page
background image
1998 Jun 18
9
Philips Semiconductors
Product specification
LCD driver for low multiplex rates
OM4068
Power-on reset
The on-chip power-on reset block initializes the chip after
power-on or power failures. The OM4068 resets to a
starting condition as follows:
• All backplane and segment outputs are set to VSS
(display off)
• All shift registers and latches are set in 3-state
• SDOUT (allowing serial cascading) is set to logic 0 (with
SCE LOW)
• Power-down mode.
Data transfers on the serial bus should be avoided for
0.5 ms following power-on to allow completion of the reset
action.
Power-down
After power-on the chip is in power-down mode as long as
the serial clock is not active. During power-down all static
currents are switched off (no internal oscillator, no timing
and no bias level generation) and all LCD-outputs are
3-stated. The power-on reset functions remain enabled.
The power-down mode is disabled at the first rising edge
of the serial clock SCLK.
LCD bias voltage generator
The intermediate bias voltages for the LCD display are
generated on-chip. This removes the need for an external
resistive bias chain and significantly reduces the system
power consumption. The full-scale LCD voltage VOP
equals VLCD − VSS. The optimum value of VOP depends on
the LCD threshold voltage (Vth) and the number of bias
levels.
Fractional LCD biasing voltages are obtained from an
internal voltage divider of three series resistors (1
3bias)
connected between VLCD and VSS. The centre resistor can
be switched out of the circuit to provide a 1
2bias voltage
level for the 1 : 2 multiplex configuration.
The bias levels depend on the multiplex rate and are
selected automatically when the display configuration is
selected using M1 and M0.
LCD voltage selector
The LCD voltage selector (control logic) coordinates the
multiplexing of the LCD in accordance with the selected
drive or display configuration. The operation of the voltage
selector is controlled by the input pins M0 and M1
(see Table 2).
Table 2
Drive mode selection
For multiplex rates of 1 : 2 three bias levels are used
including VLCD and VSS. Four bias level are used for the
1 : 3 multiplex rate. The various biasing configurations
together with the biasing characteristics as functions of
VOP =VLCD − VSS and the resulting discrimination ratios
(D), are given in Table 3.
A practical value for VOP is determinated by equating
Voff(rms) with a defined LCD threshold voltage (Vth),
typically when the LCD exhibits approximately 10%
contrast. In static mode a suitable choice is VOP >3Vth.
M1
M0
DRIVE MODE
0
0
test mode (not user accessible)
0
1
static drive (1 : 1)
1
0
duplex drive (1 : 2)
1
1
triplex drive (1 : 3)


Similar Part No. - OM4068

ManufacturerPart #DatasheetDescription
logo
Pulse A Technitrol Comp...
OM406BCO PULSE-OM406BCO Datasheet
294Kb / 11P
   Outside coupler and factory tuned whip only for KG UHF glass mount antennas
OM406BCO PULSE-OM406BCO Datasheet
395Kb / 3P
   UHF 406-512 MHz
OM406BCO PULSE-OM406BCO Datasheet
294Kb / 11P
   Outside coupler and factory tuned whip only for KG UHF glass mount antennas
OM406CK PULSE-OM406CK Datasheet
294Kb / 11P
   Outside coupler and factory tuned whip only for KG UHF glass mount antennas
OM406CK PULSE-OM406CK Datasheet
395Kb / 3P
   UHF 406-512 MHz
More results

Similar Description - OM4068

ManufacturerPart #DatasheetDescription
logo
ON Semiconductor
AX2061 ONSEMI-AX2061 Datasheet
187Kb / 18P
   LCD Driver for Low Multiplex Rates
March, 2016 ??Rev. 3
logo
NXP Semiconductors
PCA85232 NXP-PCA85232 Datasheet
391Kb / 54P
   LCD driver for low multiplex rates
Rev. 1-8 December 2010
PCF85132 NXP-PCF85132 Datasheet
1Mb / 54P
   LCD driver for low multiplex rates
Rev. 1-23 November 2010
PCF8566 NXP-PCF8566 Datasheet
247Kb / 48P
   Universal LCD driver for low multiplex rates
Rev. 07-25 February 2009
PCF8534A NXP-PCF8534A Datasheet
834Kb / 41P
   Universal LCD driver for low multiplex rates
Rev.00.90-4 February 2008
PCF8562 NXP-PCF8562 Datasheet
183Kb / 36P
   Universal LCD driver for low multiplex rates
Rev. 3-2 December 2008
PCF8576D NXP-PCF8576D Datasheet
267Kb / 52P
   Universal LCD driver for low multiplex rates
Rev. 1-18 February 2011
PCA85133 NXP-PCA85133 Datasheet
221Kb / 44P
   Universal LCD driver for low multiplex rates
Rev. 1-23 October 2009
PCF8566 PHILIPS-PCF8566 Datasheet
243Kb / 40P
   Universal LCD driver for low multiplex rates
1998 May 04
PCF85134 NXP-PCF85134 Datasheet
215Kb / 40P
   Universal LCD driver for low multiplex rates
Rev. 01-17 December 2009
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com