MAX9665ETP+ Maxim Integrated, MAX9665ETP+ Datasheet - Page 19

• Manufacturer Part Number: MAX9665ETP+
• Description: LCD Gamma Buffers 6/8/10-Channel 10-Bit Nonvolatile Programmable Gamma and VCOM Reference Voltages
• Manufacturer: Maxim Integrated

6/8/10-Channel, 10-Bit, Nonvolatile Programmable
The I
(see Tables 6, 7, and 8). After power-up, the digital cir-
cuitry loads the values stored in MTP memory into the
VCOM and gamma registers. This process takes
approximately 350µs. During this time, the I
respond to any commands (either from the user or from
the single-wire interface). To ensure the gamma chip
does not reverse bias, the source driver, the VCOM
DAC code, and the gamma DAC codes upon power-up
are as shown in the Tables 6, 7, and 8.
The I
(move) into a pair of command registers. To execute a
valid command, the command operation (CMD_OPRN)
and command operand (CMD_OPND) registers must
be written to sequentially in the same I
(between the same I
Table 5. Register Map for MAX9667
REGISTER
ADDRESS
2
2
C registers either hold DAC codes or commands
0x0D
0x01
0x03
0x05
0x07
0x09
0x0B
0x0F
0x11
0x13
0x15
0x17
0x19
0x1B
C master can write a command such as MOV
LEAST SIGNIFICANT BYTE
______________________________________________________________________________________
2
C start/stop).
REGISTER NAME
Gamma and VCOM Reference Voltages
VCOMMAX_L
VCOMMIN_L
CMD_OPND
VCOM_L
GMA0_L
GMA1_L
GMA2_L
GMA3_L
GMA4_L
GMA5_L
GMA6_L
GMA7_L
GMA8_L
GMA9_L
Register Description
2
C transaction
2
C does not
REGISTER
ADDRESS
0x0C
0x0A
0x0E
0x1A
0x00
0x02
0x04
0x06
0x08
0x10
0x12
0x14
0x16
0x18
MOST SIGNIFICANT BYTE
The form of the command is shown below:
To move data from gamma registers to gamma MTP
memory, use the following command (essentially, data
is being written into MTP memory):
MOV is the operation. Gamma registers and gamma
MTP memory are operands. Both the operation and the
operands must be assembled into machine code that is
written into the command registers. The machine code
for the operation must be written into the command
operation register (CMD_OPRN). The machine code for
the operands (if there are any) must be written into
command operand register (CMD_OPND). Table 9
shows the list of operations and operands.
MOV
Operation
REGISTER NAME
VCOMMAX_M
VCOMMIN_M
CMD_OPRN
VCOM_M
GMA0_M
GMA1_M
GMA2_M
GMA3_M
GMA4_M
GMA5_M
GMA6_M
GMA7_M
GMA8_M
GMA9_M
MOV Gamma Registers
Command
VCOM (minimum)
VCOM (maximum)
VCOM
Gamma 0
Gamma 1
Gamma 2
Gamma 3
Gamma 4
Gamma 5
Gamma 6
Gamma 7
Gamma 8
Gamma 9
Operands
COMMENTS
Gamma MTP
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