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BUF16821 Fiches technique(PDF) 11 Page - Texas Instruments

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No de pièce BUF16821
Description  Programmable Gamma-Voltage Generator and VCOM Calibrator with Integrated Two-Bank Memory
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

BUF16821 Fiches technique(HTML) 11 Page - Texas Instruments

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Single-Channel Acquire Command
General Acquire Command
MaxBank
BUF16821
www.ti.com ............................................................................................................................................................... SBOS428B – JULY 2008 – REVISED MAY 2009
When the BKSEL pin changes state, the BUF16821
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
BUF16821
The bank to be acquired depends on the state of
acknowledges this byte.
BKSEL.
4. Send a DAC/VCOM pointer address byte using the
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 BUF16821
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 001111
corresponding to the DAC/VCOM address used in the
010010 and 010011
single-channel acquire command.
It returns 0000 reads from 010000 and 010001,
These are the steps of the sequence to initiate a
and 010100 through 010111. See Table 4 for
general channel acquire:
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 BUF16821
OTP memory value.
acknowledges this byte.
4. Send a DAC/VCOM pointer address byte. Set bit
D7 = 1 and D6 = 0. Bits D5–D0 are any valid
The BUF16821 can provide the user with the number
DAC/VCOM address. Although the BUF16821
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 001111
information is provided by reading the register at
010010 and 010011
pointer address 111111.
It returns 0000 for reads from 010000 and
There are two ways to update the MaxBank register:
010001,
and
010100
through
010111.
See
Table 4 for valid DAC/VCOM addresses.
1. After initiating a single acquire command, the
BUF16821 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
BUF16821 updates the MaxBank register with a
nonvolatile memory values.
code corresponding to the maximum number of
times the most used channel (OUT1–16 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 © 2008–2009, Texas Instruments Incorporated
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