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ISL45042IRZ-T Fiches technique(PDF) 6 Page - Intersil Corporation

No de pièce ISL45042IRZ-T
Description  LCD Module Calibrator
Download  8 Pages
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Fabricant  INTERSIL [Intersil Corporation]
Site Internet  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL45042IRZ-T Fiches technique(HTML) 6 Page - Intersil Corporation

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6
FN6072.6
November 14, 2006
Table 1 gives the calculated value of VOUT for resistors
values of: RSET = 24.9kΩ, R1 = 200kΩ, R2 = 243kΩ, and
VADD = 10V.
RSET Resistor
The external RSET resistor sets the full-scale sink current
that determines the lowest voltage of the external voltage
divider R1 and R2 (Figure 1). The maximum ISET current has
to be less than 120
μA. The minimum RSET resistor with
AVDD equal to 10V is 4.17kΩ (10V/(20*120μA). Typical
applications with AVDD equal to 10V and RSET equal to
24.9k
Ω will result in a set current equal to 20μA.
Power Supply Sequence
The recommendation for power supply sequence would be
to power down the part first (Vdd, AVdd), after 100msec if
programming has occurred, and then power down the
control power supplies (CTL, CE).
Verifying the Programmed Value
The following sequence can be used to verify the
programmed value without having to sequence the VDD
supply. To verify the programmed value, follow the steps
below. The ISL45042 will read memory contents and be set
to that value when the CE pin is grounded.
1. Power up the ISL45042.
2. CE pin = VDD.
3. Change counter value with CTL pin to desired value.
4. CTL = more than 4.9V and 200msec. Counter value
programmed.
5. Change the counter value with CTL pin to a different
value.
6. CE pin = Ground.
7. Check that the output value is the one programmed in
step #4.
Generating VDD and CE supply from a Larger
Voltage Source
The CE pin has an internal pull-down resistor (RINTERNAL
Figure 5). The impedance of this resistor is 400k
Ω-500kΩ. If
your design is using a resistor divider network to generate
the 3.3V supply (for both VDD and CE to enable
programming) from a larger voltage source, the 400k
Ω
(worst case) resistor needs to be taken into account as a
parallel resistance when the CE pin is connected to this
source. Another design concern is to be able to provide
enough supply current during programming. The ISL45042
draws about 2mA during this process. Recommended
resistor values are shown in Figure 5. This design will result
in an additional 0.83mA quiescent current flowing through
resistors RA and RB..
ISL45042 Truth Table
The ISL45042 truth table is shown in Table 2. For proper
operation the CE should be disabled (pulled low) before
powering the device down to assure that the glitches and
transients will not cause unwanted EEPROM overwriting.
TABLE 1. CALCULATED VCOM OUTPUT VOLTAGES
SETTING VALUE
VOUT
1
5.468
10
5.313
20
5.141
30
4.969
40
4.797
50
4.625
60
4.453
70
4.281
80
4.109
90
3.936
100
3.764
110
3.592
128
3.282
TABLE 2. TRUTH TABLE
INPUT
OUTPUT
CTL
CE
VDD
OUT
ICC
MEMORY
Mid to Hi
Hi
VDD
Increment
Normal
X
Mid to Lo
Hi
VDD
Decrement
Normal
X
X
Lo
VDD
No Change Increased
Read
>4.9V
Hi
VDD
No Change Increased
Program
FIGURE 5. APPLICATION GENERATING VDD AND VCE
VOLTAGES
VCC= 5V
CE LOGIC
RINTERNAL = 400kΩ to 500kΩ
RA
RB
2k
Ω
4k
Ω
ISL45042
CE
VCE
ISL45042


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