ISL45042A Intersil Corporation, ISL45042A Datasheet - Page 4

• Manufacturer Part Number: ISL45042A
• Description: LCD Module Calibrator
• Manufacturer: Intersil Corporation

Application Information
The application circuit to adjust the VCOM voltage in an LCD
panel is shown in Figure 1. The ISL45042A 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 ISL45042A 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.
Electrical Specifications
NOTES:
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: V
Typicals are at T
AVDD to SET
SYMBOL
SET
SET
OUT
OUT
SET
SET
SET
V
ISET
P
OUT
T
ZSE
FSE
VR
DN
ER
VD
ST
A
DD
= +25°C (Continued)
= 3V, AVDD = 10V, OUT = 5V, R
(Note 4)
Monotonic Over Temperature
Through R
To GND, AVDD = 20V
To GND, AVDD = 4.5V
to ±0.5 LSB Error Band (Note 5)
(Note 5)
ISL45042A
TEST CONDITIONS
SET
(Note 7)
FIGURE 1. VCOM ADJUSTMENT IN AN LCD PANEL
COLUMN
DRIVER
CTL
CE
SET
AVDD
SET
ISL45042A
= 24.9kΩ; Unless Otherwise Specified.
R
25 to 55
TEMP
SET
(°C)
Full
Full
Full
Full
Full
Full
Full
Full
Full
Full
Full
OUT
+
-
VSET +
0.5V
MIN
2.25
10
7
-
-
-
-
-
-
-
I
Sink
SINGLE PIXEL
IN LCD PANEL
TYP
1:20
<10
AVDD
20
20
7
-
-
-
-
-
-
R
R
1
2
MAX
100
200
±1
±2
±8
45
13
7
-
-
-
-
October 13, 2006
VCOM
UNITS
FN6158.2
LSB
LSB
LSB
Bits
V/V
mV
ms
µA
kΩ
kΩ
µs
V