MAX1512 Datasheet, PDF (8/12 Pages) Maxim Integrated Products – EEPROM-Programmable TFT VCOM Calibrator

EEPROM-Programmable TFT VCOM Calibrator
MECHANICAL
POTENTIOMETER
AVDD
Ra
Rb
VCOM
Rc
R1 = Ra
R2 = Rb + Rc
R_SET
=
Ra
× (Rb + Rc)
20 × Rb
Figure 3. Replacement of Mechanical/Potentiometer Circuit
MAX1512
EQUIVALENT CIRCUIT
AVDD
MAX1512
OUT
SET
AVDD
R1
R2
R_SET
VCOM
MECHANICAL
POTENTIOMETER
AVDD
Rd
Re
VCOM
Rf
R1 = Rd
R2 = Rf
Rd × (Rd + Re + Rf)
R_SET =
20 × Re
Figure 4. Replacement of Mechanical/Potentiometer Circuit
MAX1512
EQUIVALENT CIRCUIT
AVDD
MAX1512
OUT
SET
AVDD
R1
R2
R_SET
VCOM
Translating Existing Potentiometer
Circuits
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.
Interface Enable/Disable (CE)
The MAX1512 control interface can be disabled to
reduce the V_DD supply current. Connect CE to GND to
reduce the typical supply current from 32µA to 12µA.
Connect CE to V_DD to enable the control interface.
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