ISL24201_14 Datasheet, PDF (5/12 Pages) Intersil Corporation – Programmable VCOM Calibrator with EEPROM

ISL24201
Electrical Specifications Test Conditions: V_DD = 3.3V, A_VDD = 18V, R_SET = 5kΩ, R₁ = 10kΩ, R₂ = 10kΩ, (See Figure 5); unless otherwise
specified. Typicals are at T_A = +25°C. Boldface limits apply over the operating temperature range, -40°C to +85°C. (Continued)
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
(Note 6)
MAX
TYP (Note 6) UNITS
I²C TIMING
f_CLK
t_SCH
t_SCL
t_DSP
t_SDS
t_SDH
t_BUF
t_STS
t_STH
t_SPS
I²C Clock Frequency
I²C Clock High Time
I²C Clock Low Time
I²C Spike Rejection Filter Pulse Width
I²C Data Set Up Time
I²C Data Hold Time
I²C Time Between Stop and Start
I²C Repeated Start Condition Set-up
I²C Repeated Start Condition Hold
I²C Stop Condition Set-up
400
kHz
0.6
µs
1.3
µs
0
50
ns
250
ns
250
ns
200
µs
0.6
µs
0.6
µs
0.6
µs
C_SDA SDA Pin Capacitance
10
pF
C_S
SCL Pin Capacitance
10
pF
t_W
EEPROM Write Cycle Time
100
ms
NOTE:
6. Compliance to datasheet limits is assured by one or more methods: production test, characterization and/or design.
Application Information
A_VDD
The ISL24201 provides the ability to adjust the V_COM voltage
during production test and alignment, under digital control, to
RA
minimize the flicker of an LCD panel. A digitally controlled
potentiometer (DCP), with 256 steps of resolution, adjusts the sink
current of the OUT pin. Figure 3 shows the V_COM adjustment using
R₁ = R_A
R_B
V_COM
a mechanical potentiometer circuit and the equivalent circuit
R₂ = R_B+R_C
replacement with the ISL24201.
The output is connected to an external voltage divider, as shown in
Figure 3, so that the ISL24201 will have the ability to reduce the
R_SET = R_AR_B + R_AR_C
R_C
20RB
voltage on the output by increasing the OUT pin sink current. The
amount of current sunk is controlled by the I²C serial interface.
V_DD
A_VDD
A_VDD
ISL24201
or
R₁
ISL24202
I_OUT
OUT
SET
R₂
R_SET
V_COM
FIGURE 3. MECHANICAL ADJUSTMENT REPLACEMENT
5
FN7586.1
December 9, 2010