BUF08821 datasheet(13/28 Pages) TI2

13 / 28 page

BUF08821

www.ti.com

SBOS438D

– AUGUST 2008 – REVISED JULY 2011

Communication may be terminated by sending a

5. Send a STOP condition on the bus.

premature STOP or START condition on the bus, or

The BUF08821 acknowledges each data byte. If the

by not sending the acknowledge bit. The reading of

master terminates communication early by sending a

registers

DieID,

DieRev,

and

MaxBank

not

STOP or START condition on the bus, the specified

supported in this mode of operation (they must be

nonvolatile

not

updated.

Writing

read using the single register read method).

nonvolatile register also updates the DAC/VCOM

The register pointer increments directly from 000111

through 010010 to allow all eight gamma channels

The DAC/VCOM register and DAC/VCOM output voltage

plus the VCOM channel to be updated in one

are updated immediately, while the programming of

transaction.

the nonvolatile memory takes up to 250

μs. Once a

nonvolatile register write command has been issued,

Write: Nonvolatile Memory for the DAC Register

no communication with the BUF08821 should take

The BUF08821 is able to write to the nonvolatile

place for at least 250

μs. Writing or reading over the

memory

single

DAC/VCOM

single

serial interface while the nonvolatile memory is being

communication

transaction.

contrast

the

written jeopardizes the integrity of the data being

BUF20820, writing to multiple nonvolatile memory

stored.

words in a single transaction is not supported. Valid

DAC/VCOM pointer addresses begin with 000000

Read: Nonvolatile Memory for the DAC Register

(which corresponds to OUT1) through 000111 (which

To read the data present in nonvolatile register for a

corresponds to OUT8). Address 010010 is for VCOM.

particular DAC/VCOM channel, the master must first

When programming the nonvolatile memory, the

issue a general acquire command, or a single acquire

analog supply voltage must be between 9V and 20V.

command with the appropriate DAC/VCOM channel

Write commands are performed by setting the

chosen. This action updates both the DAC/VCOM

read/write bit low.

master

may

then

read

from

the

appropriate

To write to a single nonvolatile register:

DAC/VCOM register as described earlier.

1. Send a START condition on the bus.

Table 4. DAC Register Pointer Addresses

2. Send the device address and read/write bit =

LOW. The BUF08821 acknowledges this byte.

DAC REGISTER

POINTER ADDRESS

The

BUF08821

acknowledges,

stores,

and

OUT1

000000

returns data only from these addresses:

OUT2

000001

– 000000 through 000111

OUT3

000010

– 010010

OUT4

000011

See Table 4 for DAC/VCOM addresses.

OUT5

000100

3. Send a DAC/VCOM pointer address byte. Set bit

OUT6

000101

D7 = 0 and D6 = 0. Bits D5

–D0 are the

OUT7

000110

DAC/VCOM address.

OUT8

000111

4. Send two bytes of data for the nonvolatile register

of the specified DAC/VCOM. Begin by sending the

VCOM

010010

most significant byte first (bits D15

–D8, of which

OTHER REGISTER

POINTER ADDRESS

only bits D9 and D8 are data bits, and bits

Die_Rev

111100

D15

–D14 must be 01), followed by the least

Die_ID

111101

significant byte (bits D7

–D0). The register is

MaxBank

111111

updated after receiving the second byte.

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