Datenblatt-pdf.com


PC2119RU Schematic ( PDF Datasheet ) - NXP Semiconductors

Teilenummer PC2119RU
Beschreibung LCD controllers/drivers
Hersteller NXP Semiconductors
Logo NXP Semiconductors Logo 




Gesamt 30 Seiten
PC2119RU Datasheet, Funktion
INTEGRATED CIRCUITS
DATA SHEET
PCF2119x
LCD controllers/drivers
Product specification
Supersedes data of 1997 Nov 21
File under Integrated Circuits, IC12
1999 Mar 02






PC2119RU Datasheet, Funktion
Philips Semiconductors
LCD controllers/drivers
Product specification
PCF2119x
7 FUNCTIONAL DESCRIPTION
7.1 LCD supply voltage generator
The LCD supply voltage may be generated on-chip.
The voltage generator is controlled by two internal 6-bit
registers: VA and VB. The nominal LCD operating voltage
at room temperature is given by the relationship:
VOP(nom) = (integer value of register × 0.082) + 1.82
7.2 Programming ranges
Programmed value: 1 to 63. Voltage: 1.902 to 6.986 V.
Tref = 27 °C.
Values producing more than 6.5 V at operating
temperature are not allowed. Operation above this
voltage may damage the device. When programming the
operating voltage the VLCD temperature coefficient must
be taken into account.
Values below 2.2 V are below the specified operating
range of the chip and are therefore not allowed.
Value 0 for VA and VB switches the generator off
(i.e. VA = 0 in character mode, VB = 0 in icon mode).
Usually register VA is programmed with the voltage for
character mode and register VB with the voltage for icon
mode.
When VLCD is generated on-chip the VLCD pads should be
decoupled to VSS with a suitable capacitor. The generated
VLCD is independent of VDD and is temperature
compensated. When the generator is switched off an
external voltage may be supplied at connected pads
VLCD1,2. VLCD1,2 may be higher or lower than VDD.
The LCD supply voltage generator ensures that, as long as
VDD is in the valid range (2.2 to 4 V), the required peak
voltage VOP = 5.2 V can be generated at any time.
7.3 LCD bias voltage generator
The intermediate bias voltages for the LCD display are
also generated on-chip. This removes the need for an
external resistive bias chain and significantly reduces the
system current consumption. The optimum value of VLCD
depends on the multiplex rate, the LCD threshold voltage
(Vth) and the number of bias levels. Using a 5-level bias
scheme for 1 : 18 maximum rate allows VLCD < 5 V for
most LCD liquids. The intermediate bias levels for the
different multiplex rates are shown in Table 2. These bias
levels are automatically set to the given values when
switching to the corresponding multiplex rate.
Table 2 Bias levels as a function of multiplex rate
MULTIPLEX NUMBER
RATE OF LEVELS
V1
V2
V3
V4
V5
1 : 18
1:9
1:2
5
5
4
Vop
3/4(1)
1/2
1/2
1/4
Vop 3/4 1/2 1/2 1/4
Vop 2/3 2/3 1/3 1/3
Note
1. The values in the above table are given relative to Vop Vss, e.g. 3/4 means 3/4 × (Vop Vss).
V6
Vss
Vss
Vss
7.4 Oscillator
The on-chip oscillator provides the clock signal for the display system. No external components are required and the OSC
pad must be connected to VDD.
1999 Mar 02
6

6 Page









PC2119RU pdf, datenblatt
Philips Semiconductors
LCD controllers/drivers
Product specification
PCF2119x
handbook, full pagewiduthpper
lower 4 bits
4 bits
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
xxxx 0000 1
xxxx 0001 2
xxxx 0010 3
xxxx 0011 4
xxxx 0100 5
xxxx 0101 6
xxxx 0110 7
xxxx 0111 8
xxxx 1000 9
xxxx 1001 10
xxxx 1010 11
xxxx 1011 12
xxxx 1100 13
xxxx 1101 14
xxxx 1110 15
xxxx 1111 16
Fig.8 Character set ‘V’ in CGROM.
MGL597
1999 Mar 02
12

12 Page





SeitenGesamt 30 Seiten
PDF Download[ PC2119RU Schematic.PDF ]

Link teilen




Besondere Datenblatt

TeilenummerBeschreibungHersteller
PC2119RLCD controllers/driversNXP Semiconductors
NXP Semiconductors
PC2119RULCD controllers/driversNXP Semiconductors
NXP Semiconductors

TeilenummerBeschreibungHersteller
CD40175BC

Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.

Fairchild Semiconductor
Fairchild Semiconductor
KTD1146

EPITAXIAL PLANAR NPN TRANSISTOR.

KEC
KEC


www.Datenblatt-PDF.com       |      2020       |      Kontakt     |      Suche