ISL45042 Intersil Corporation, ISL45042 Datasheet - Page 4

• Manufacturer Part Number: ISL45042
• Description: LCD Module Calibrator
• Manufacturer: Intersil Corporation

Electrical Specifications
NOTES:
Application Information
The application circuit to adjust the VCOM voltage in an LCD
panel is shown in Figure 1. The ISL45042 has a 128-step
sink current resolution. The output is connected to an
external voltage divider, that results in decreasing the output
VCOM voltage as you increase the ISL45042 sink current.
CTL Pin
The adjustment of the output VCOM voltage and the
programming of the non-volatile memory are provided
through a single pin called CTL, when the CE pin is high.
The output VCOM voltage is increased with a mid (Vdd/2) to
high transition (0.8*VDD) on CTL pin. The output VCOM
voltage is decreased with a mid (Vdd/2) to low transition
(0.3*VDD), on CTL pin (Reference Figure 6). Once the
minimum or maximum value is reached on the 128 steps,
the device will not overflow or underflow beyond that
minimum or maximum value.
Programming of the non-volatile memory occurs when the
CTL pin exceeds 4.9V. The CTL signal needs to remain
above 4.9V for more than 200µs. The level and timing
needed to program the non-volatile memory is given in
Figure 2. It then takes a maximum of 100ms for the
programming to be completed inside the device.
Programming Time
SET Voltage Resolution
SET Differential Nonlinearity
SET Zero-Scale Error
SET Full-Scale Error
SET Current
SET External Resistance
AVDD to SET Voltage Attenuation
OUT Settling Time
OUT Voltage Range
OUT Voltage Drift
2. CTL signal only needs to be greater than 4.9V to program EEPROM.
3. Tested at AVDD = 20V.
4. The Counter value is set to mid-scale ±4 LSB’s in the Production.
5. Simulated and Determined via Design and NOT Directly Tested.
6. Simulated Maximum Current Draw when Programming EEPROM is 23mA, should be considered when designing Power Supply.
7. A Typical Current of 20μA is Calculated using the AVDD = 10V and RSET = 24.9kΩ. The maximum suggested SET Current should be 120μA.
PARAMETER
4
Test Conditions: VDD = 3V, AVDD = 10V, OUT = 5V, R
Typicals are at T
AVDD to SET
SYMBOL
SET
SET
OUT
SET
SET
SET
OUT
V
ISET
P
OUT
T
ZSE
FSE
DN
VR
ER
ST
VD
A
= +25°C (Continued)
Through R
(Note 4)
Monotonic Over Temperature
To GND, AVDD = 20V
To GND, AVDD = 4.5V
to ±0.5 LSB Error Band (Note 5)
(Note 5)
ISL45042
TEST CONDITIONS
SET
(Note 7)
FIGURE 1. VCOM ADJUSTMENT IN AN LCD PANEL
COLUMN
DRIVER
CTL
CE
SET
AVDD
SET
ISL45042
= 24.9kΩ; Unless Otherwise Specified.
R
25 to 55
SET
TEMP
(°C)
Full
Full
Full
Full
Full
Full
Full
Full
Full
Full
Full
OUT
+
-
VSET +
2.25
0.5V
MIN
10
7
-
-
-
-
-
-
-
I
Sink
SINGLE PIXEL
IN LCD PANEL
TYP
1:20
AVDD
<10
20
20
7
-
-
-
-
-
-
R
R
1
2
MAX
November 14, 2006
100
200
±1
±2
±8
45
13
7
-
-
-
-
VCOM
FN6072.6
UNITS
LSB
LSB
LSB
Bits
V/V
mV
ms
μA
kΩ
kΩ
μs
V