pca85162 NXP Semiconductors, pca85162 Datasheet - Page 21

• Manufacturer Part Number: pca85162
• Description: Universal Lcd Driver For Low Multiplex Rates
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCA85162_1
Product data sheet
The I
condition (S) from the I
slave addresses available. All PCA85162 whose SA0 inputs correspond to bit 0 of the
slave address respond by asserting an acknowledge in parallel. This I
ignored by all PCA85162 whose SA0 inputs are set to the alternative level.
After an acknowledgement, one or more command bytes follow that define the status of
each addressed PCA85162.
The last command byte sent is identified by resetting its most significant bit, continuation
bit C (see
PCA85162 on the bus.
After the last command byte, one or more display data bytes may follow. Display data
bytes are stored in the display RAM at the address specified by the data pointer and the
subaddress counter. Both data pointer and subaddress counter are automatically updated
and the data directed to the intended PCA85162 device.
An acknowledgement after each byte is asserted only by the PCA85162 that are
addressed via address lines A0, A1, and A2. After the last display byte, the I
master asserts a STOP condition (P). Alternately a START may be asserted to restart an
I
2
Fig 15. I
Fig 16. Format of command byte
•
•
C-bus access.
Up to 16 PCA85162 for very large LCD applications
The use of two types of LCD multiplex drive
2
C-bus protocol is shown in
2
S
Figure
C-bus protocol
0 1 1 1 0 0
slave address
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16). The command bytes are also acknowledged by all addressed
1 byte
2
Rev. 01 — 19 April 2010
C-bus master which is followed by one of two possible PCA85162
S
A
0
R/W
MSB
0 A C
C
Figure
acknowledge by
all addressed
n ≥ 1 byte(s)
PCA85162
COMMAND
REST OF OPCODE
15. The sequence is initiated with a START
Universal LCD driver for low multiplex rates
A
msa833
DISPLAY DATA
n ≥ 0 byte(s)
LSB
by A0, A1 and A2
update data pointers
subaddress counter
PCA85162 only
PCA85162
and if necessary,
acknowledge
selected
2
C-bus transfer is
© NXP B.V. 2010. All rights reserved.
A
013aaa057
P
2
C-bus
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