MAX1512 Maxim Integrated Products, MAX1512 Datasheet - Page 9

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

Figure 5. Optional Circuit to Drive CE
Figure 6. VCOM Adjustment
EEPROM-Programmable TFT VCOM Calibrator
PROGRAMMING
DAC SETTING
CIRCUIT
CE / V
V
VCOM
DD
CTL
DD
CTL HIGH
CTL LOW
_______________________________________________________________________________________
V
DD
/2
UNDEFINED
R
CE
>1ms
CE
CTL
GND
MAX1512
IGNORED
CTL
ENABLED
>200µs
COUNT
FIRST
64
>200µs
The programming circuit in Figure 5 drives CE high to
enable the CTL input when it is connected. When the
programming circuit is not connected, CE is pulled low
through resistor R
CTL input is relatively immune to noise and brief volt-
age transients. It can be safely left continuously
enabled if higher supply current is acceptable.
Pulse CTL low for more than 200µs to increment the DAC
setting, which increases the OUT sink current and lowers
the VCOM level by 1 least-significant bit (LSB) (Figure 6).
Similarly, pulse CTL high for more than 200µs to decre-
ment the DAC setting, which decreases the OUT sink cur-
rent and increases the VCOM level by 1 LSB.
>200µs >10µs
65
>200µs
64
CE
IGNORED
COUNTS
<20µs
SHORT
, which disables the CTL input. The
VCOM Adjustment (CTL)
63
<20µs
VCOM DOWN
VCOM UP
9