pca8576c NXP Semiconductors, pca8576c Datasheet - Page 6

• Manufacturer Part Number: pca8576c
• Description: Universal Lcd Driver For Low Multiplex Rates
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCA8576C
Product data sheet
7.1 Power-On-Reset (POR)
7.2 LCD bias generator
The host microprocessor or microcontroller maintains the 2-line I
channel with the PCA8576C.
Biasing voltages for the multiplexed LCD waveforms are generated internally, removing
the need for an external bias generator. The internal oscillator is selected by connecting
pin OSC to V
power supplies (pins V
At power-on the PCA8576C resets to the following starting conditions:
Remark: Do not transfer data on the I
the reset action to complete.
The full-scale LCD voltage (V
temperature compensated externally through the V
Fractional LCD biasing voltages are obtained from an internal voltage divider comprising
three series resistors connected between V
switched out of the circuit to provide a
configuration.
Fig 4.
•
•
•
•
•
•
All backplane and segment outputs are set to V
The selected drive mode is 1:4 multiplex with
Blinking is switched off
Input and output bank selectors are reset (as defined in
The I
The data pointer and the subaddress counter are cleared
V
V
DD
SS
CONTROLLER
PROCESSOR/
2
Typical system configuration
C-bus interface is initialized
MICRO-
MICRO-
HOST
SS
. The only other connections required to complete the system are the
All information provided in this document is subject to legal disclaimers.
R≤
2C
t
r
B
DD
Rev. 1 — 22 July 2010
, V
SS
oper
, and V
OSC
SDA
SCL
) is obtained from V
LCD
A0
2
1
C-bus for at least 1 ms after a power-on to allow
⁄
V
2
PCA8576C
) and the LCD panel selected for the application.
DD
bias voltage level for the 1:2 multiplex
A1
Universal LCD driver for low multiplex rates
DD
A2
and V
V
LCD
SA0 V
1
⁄
LCD
3
DD
DD
LCD
bias
SS
40 segment drives
supply to pin V
− V
. The center resistor can be
4 backplanes
LCD
Table
. The LCD voltage may be
2
C-bus communication
8)
PCA8576C
LCD
© NXP B.V. 2010. All rights reserved.
LCD PANEL
(up to 160
elements)
.
013aaa275
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