PCA85232DA NXP [NXP Semiconductors], PCA85232DA Datasheet - Page 7

• Manufacturer Part Number: PCA85232DA
• Description: LCD driver for low multiplex rates
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
PCA85232
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 PCA85232.
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 (V
At power-on the PCA85232 resets to the following starting conditions:
Remark: Do not transfer data on the I
the reset action to complete.
Fractional LCD biasing voltages are obtained from an internal voltage divider consisting of
three impedances connected in series between V
bypassed by switch if the
configuration is selected.
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
The I
The data pointer and the subaddress counter are cleared (set to logic 0)
The display is disabled
If internal oscillator is selected (pin OSC connected to V
signal on pin CLK
V
V
DD
SS
CONTROLLER
2
PROCESSOR/
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 ≤
DD
2C
t
, V
r
B
Rev. 1 — 8 December 2010
SS
, and V
1
⁄
2
bias voltage level for the 1:2 multiplex drive mode
SDAACK
LCD
OSC
SDA
SCL
) and the LCD panel selected for the application.
2
C-bus for at least 1 ms after a power-on to allow
A0
PCA85232
V
DD
A1 SA0
LCD
V
1
LCD
⁄
3
LCD
bias
V
LCD driver for low multiplex rates
and V
SS
160 segment drives
4 backplanes
SS
SS
. The center impedance is
), then there is no clock
2
C-bus communication
PCA85232
© NXP B.V. 2010. All rights reserved.
LCD PANEL
(up to 640
elements)
013aaa284
7 of 54