ISL24212IRTZ Intersil, ISL24212IRTZ Datasheet - Page 8

• Manufacturer Part Number: ISL24212IRTZ
• Description: ISL24212IRTZ VCOM Driver + Calibrator W/ An Up Down
• Manufacturer: Intersil
• Series: -r
• Type: Calibratorr

Specifications of ISL24212IRTZ

• Applications: LCD Drive, Reference Voltage Generator
• Mounting Type: Surface Mount
• Package / Case: 10-WFDFN Exposed Pad
• Rohs Compliant: Yes
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

By finding the difference of Equation 13 and Equation 12, the total
span of V
Assuming that the I
expression in Equation 14 simplifies to:
DVR_OUT Pin Leakage Current
When the voltage on the DVR_OUT pin is greater than 10V, an
additional leakage current flows into the pin in addition to the
I
pin current for DVR_OUT pin voltage up to 19V. In applications
where the voltage on the DVR_OUT pin will be greater than 10V,
the actual output voltage will be lower than the voltage
calculated by Equation 8 due to this extra current. The graph in
Figure 6 was measured with R
Power Supply Sequence
The recommended power supply sequencing is shown in
Figure 7. When applying power, V
at the same time as AV
When removing power, the sequence of V
important.
V
V
SET
COM
COM
current. Figure 6 shows the I
0.30
0.25
0.20
0.15
0.10
0.05
0.00
SPAN
SPAN
0
COM
REGISTER = 255
FIGURE 6. DVR_OUT PIN LEAKAGE CURRENT
A
=
=
VDD
V
2
can be found:
FIGURE 7. POWER SUPPLY SEQUENCE
AV
⎛
⎜
⎝
DD
------------------- -
R
R
1
DD
1
+
⋅
4
⎛
⎜
⎝
DVROUT
R
R
------------------- -
R
2
2
1
⎞
⎟
⎠
R
DD
+
⎛
⎜
⎝
6
2
------------------- -
20R
R
OUT PIN VOLTAGE (V)
AV
. The minimum time for t
2
(MIN) = 0 instead of I
⎞
⎟
⎠
DD
SET
⎛
⎝
8
1
SET
8
–
⎞
⎟
⎠
SET
--------- -
256
DD
=
= 4.99kΩ.
10
1
t
VS
⎛
⎜
⎝
should be applied before or
⎞
⎠
current and the DVR_OUT
------------------- -
R
R
⎛
⎜
⎝
1
1
------------------- -
20R
OUT PIN CURRENT
SET PIN CURRENT
12
+
⋅
R
R
DD
R
1
2
SET
2
⎞
⎟
⎠
and AV
14
I
DVROUT
⎞
⎟
⎠
STEP
16
VS
DD
, the
(
is 0µs.
MAX
is not
18
(EQ. 15)
(EQ. 14)
ISL24212
)
20
Do not remove V
EEPROM programming cycle. Removing power before the
EEPROM programming cycle is completed, may result in
corrupted data in the EEPROM.
Operating and Programming
Supply Voltage and Current
To program the EEPROM, AV
programming is not required, the ISL24212 will operate over an
AV
During EEPROM programming, I
4-5x higher for up to 100ms (t
Up/Down Counter Interface
The ISL24212 allows the adjustment of the output V
and the programming of the non-volatile memory through a
single pin (CTL) when the CE (counter enable) pin is high. The CTL
pin is biased so that its voltage is set to VDD/2 if the driving
circuit is set to Tristate or High Impedance (Hi-Z), allowing
up/down operation using common digital I/O logic.
CTL Pin
When a mid-high-mid transition is detected on the CTL pin (see
Figure 11), the internal register value counts down by one at the
trailing (high-mid) edge, and the output V
increased according to Equation 8. Similarly, when a mid-low-mid
transition is detected on the CTL pin, the internal register value
counts up by one at the trailing (low-mid) edge, and the output
V
value is reached, the counter saturates and will not overflow or
underflow beyond those values.
CTL should have a noise filter to reduce bouncing or noise on the
input that could cause unwanted counts when the CE pin is high.
Figure 8 shows a simple debouncing circuit consisting of a series
1kΩ resistor and a shunt 0.01µF capacitor connected on the CTL
pin. To avoid unintentional adjustment, the ISL24212 guarantees
to reject CTL pulses shorter than 20µs.
This pin is pulled above 4.9V to program the EEPROM. See
“Programming the EEPROM” on page 9 for details.
After CE (Counter Enable) is asserted and after programming
EEPROM, the very first CTL pulse is ignored (see Figure 11) to
avoid the possibility of a false count (CTL state may be unknown
after programming).
COM
DD
range of 4.5V to 19V.
voltage is decreased. Once the maximum or minimum
FIGURE 8. EXTERNAL DEBOUNCER ON CTL PIN
PROGRAM
DD
CLOSE TO
EEPROM
or AV
0.01µF
1kΩ
DD
AV
DD
within 100ms of the start of the
DD
PROG
must be ≥10.8V. If further
DD
CTL
and I
).
ISL24212
AVDD
COM
will temporarily be
voltage is
COM
March 15, 2011
voltage
FN7590.0