MAX1512 Maxim Integrated Products, MAX1512 Datasheet - Page 8

• Manufacturer Part Number: MAX1512
• Description: EEPROM-Programmable TFT VCOM Calibrator
• Manufacturer: Maxim Integrated Products

Existing VCOM adjustment circuits using conventional
mechanical potentiometers can be translated into
MAX1512 circuits. Figures 3 and 4 show two common
adjustment circuits and their equivalent MAX1512 cir-
cuits.
EEPROM-Programmable TFT VCOM Calibrator
Figure 3. Replacement of Mechanical/Potentiometer Circuit
Figure 4. Replacement of Mechanical/Potentiometer Circuit
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POTENTIOMETER
Rd
Re
Rf
MECHANICAL
AVDD
Rb
Ra
Rc
POTENTIOMETER
AVDD
MECHANICAL
Translating Existing Potentiometer
VCOM
VCOM
R1 = Ra
R2 = Rb + Rc
R
R1 = Rd
R2 = Rf
R
SET
SET
=
=
Rd × (Rd + Re + Rf)
Ra × (Rb + Rc)
Circuits
20 × Rb
20 × Re
The MAX1512 control interface can be disabled to
reduce the V
reduce the typical supply current from 32µA to 12µA.
Connect CE to V
EQUIVALENT CIRCUIT
MAX1512
MAX1512
MAX1512
EQUIVALENT CIRCUIT
MAX1512
DD
AVDD
AVDD
OUT
OUT
SET
SET
DD
supply current. Connect CE to GND to
Interface Enable/Disable (CE)
to enable the control interface.
R
R
SET
SET
AVDD
AVDD
R1
R2
R1
R2
VCOM
VCOM