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BUF08832 Datasheet(PDF) 11 Page - Texas Instruments

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No. de pieza BUF08832
Descripción Electrónicos  Programmable Gamma-Voltage Generator and High Slew Rate VCOM with Integrated Two-Bank Memory
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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BUF08832 Datasheet(HTML) 11 Page - Texas Instruments

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BUF08832
www.ti.com
SBOS476C
– AUGUST 2009 – REVISED JULY 2011
Single-Channel Acquire Command
When the BKSEL pin changes state, the BUF08832
acquires the last programmed DAC/VCOM values from
These are the steps to initiate a single-channel
the nonvolatile memory associated with this newly
acquire:
chosen bank. At power-up, the state of the BKSEL
1. Be sure BKSEL is in its desired state and has
pin determines which memory bank is selected.
been stable for at least 1ms.
The I2C master also has the ability to update
2. Send a START condition on the bus.
(acquire) the DAC registers with the last programmed
3. Send the device address (based on A0) and
nonvolatile memory values using software control.
read/write
bit
=
LOW.
The
BUF08832
The bank to be acquired depends on the state of
acknowledges this byte.
BKSEL.
4. Send a DAC/VCOM pointer address byte using the
General Acquire Command
DAC/VCOM address corresponding to the output
and register to update with the OTP memory
A general acquire command is used to update all
value. Set bit D7 = 0 and D6 = 1. Bits D5-D0 are
registers
and
DAC/VCOM
outputs
to
the
last
the DAC/VCOM address. Although the BUF08832
programmed values stored in nonvolatile memory. A
acknowledges 000000 through 010111, it stores
single-channel acquire command updates only the
and returns data only from these addresses:
register and DAC/VCOM output of the DAC/VCOM
– 000000 through 000111
corresponding to the DAC/VCOM address used in the
– 010010
single-channel acquire command.
It returns 0000 reads from 001000 through
These are the steps of the sequence to initiate a
010001,
and
010011
through
010111.
See
general channel acquire:
Table 4 for valid DAC/VCOM addresses.
1. Be sure BKSEL is in its desired state and has
5. Send a STOP condition on the bus.
been stable for at least 1ms.
Approximately
36
μs
(
±4μs)
after
issuing
this
2. Send a START condition on the bus.
command, the specified DAC/VCOM register and
3. Send the appropriate device address (based on
DAC/VCOM output voltage change to the appropriate
A0) and the read/write bit = LOW. The BUF08832
memory value.
acknowledges this byte.
4. Send a DAC/VCOM pointer address byte. Set bit
MaxBank
D7 = 1 and D6 = 0. Bits D5-D0 are any valid
The BUF08832 can provide the user with the number
DAC/VCOM address. Although the BUF08832
of times the nonvolatile memory of a particular
acknowledges 000000 through 010111, it stores
DAC/VCOM channel nonvolatile memory has been
and returns data only from these addresses:
written
to
for
the
current
memory
bank.
This
– 000000 through 000111
information is provided by reading the register at
– 010010
pointer address 111111.
It returns 0000 for reads from 001000 through
There are two ways to update the MaxBank register:
010001,
and
010011
through
010111.
See
Table 4 for valid DAC/VCOM addresses.
1. After initiating a single acquire command, the
BUF08832 updates the MaxBank register with a
5. Send a STOP condition on the bus.
code corresponding to how many times that
Approximately
750
μs
(
±80μs)
after
issuing
this
particular channel memory has been written to.
command, all DAC/VCOM registers and DAC/VCOM
2. Following
a
general
acquire
command,
the
output voltages change to the respective, appropriate
BUF08832 updates the MaxBank register with a
nonvolatile memory values.
code corresponding to the maximum number of
times the most used channel (OUT1-8 and
xxx
VCOMs) has been written to.
xxx
MaxBank is a read-only register and is only updated
by performing a general- or single-channel acquire.
Copyright
© 2009–2011, Texas Instruments Incorporated
11


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