pcf8536 NXP Semiconductors, pcf8536 Datasheet - Page 26

• Manufacturer Part Number: pcf8536
• Description: Universal Lcd Driver For Low Multiplex Rates Including A 6 Channel Pwm Generator
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCF8536
Product data sheet
8.4 LCD voltage selector
The host microcontroller maintains the two line I
communication channel with the PCF8536. The appropriate biasing voltages for the
multiplexed LCD waveforms are generated internally. The only other connections required
to complete the system are the power supplies (V
selected for the application.
The minimum recommended values for external capacitors on V
respectively. Decoupling of V
capacitors should be placed close to the IC with short connections to the respective
supply pin and V
The LCD voltage selector co-ordinates the multiplexing of the LCD in accordance with the
selected LCD drive configuration. The operation of the voltage selector is controlled by the
set-bias-mode command (see
Table
Fractional LCD biasing voltages are obtained from an internal voltage divider. The biasing
configurations that apply to the preferred modes of operation, together with the biasing
characteristics as functions of V
Table
Fig 12. Typical system configuration for the I
Fig 13. Typical system configuration for the SPI-bus
V
V
18).
31.
DD
DD
V
V
SS
SS
CONTROLLER
PROCESSOR/
CONTROLLER
PROCESSOR/
MICRO-
MICRO-
HOST
HOST
All information provided in this document is subject to legal disclaimers.
SS
R=
Universal LCD low multiplex driver with 6 channel PWM generator
.
2C b
t
r
Rev. 1 — 6 October 2011
LCD
Table
LCD
will help to reduce display artifacts. The decoupling
SDA
SCL
SDI
SCL
CE
and the resulting discrimination ratios (D), are given in
19) and the set-MUX-mode command (see
V
V
DD
DD
PCF8536AT
PCF8536BT
A0
2
C-bus
2
C-bus or a three line SPI-bus
DD
, V
SS
V
V
, V
SS
SS
4 to 8 backplanes
40 to 44 segment
drives
4 to 8 backplanes
40 to 44 segment
drives
LCD
) and the LCD panel
DD
and V
PCF8536
© NXP B.V. 2011. All rights reserved.
LCD
LCD PANEL
(up to 320
elements)
LCD PANEL
(up to 320
elements)
013aaa451
are 100 nF
013aaa450
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