LM8342SD/NOPB National Semiconductor, LM8342SD/NOPB Datasheet - Page 12

• Manufacturer Part Number: LM8342SD/NOPB
• Description: IC PROG TFT CALIBRATOR 10-LLP
• Manufacturer: National Semiconductor

Specifications of LM8342SD/NOPB

• Applications: *
• Mounting Type: Surface Mount
• Package / Case: 10-LLP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM8342SD; LM8342SDTR

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The LM8342 can be used in I
clock speeds of up to 400 kbps (Fast mode). For low speed
applications, an initial resistor value for the pull-up resistors
is 15 kΩ is suitable. When increasing the speed of the inter-
face bus, the user should decrease the value of the pull-up
resistors.
The output current of the LM8342 can be calculated using
Equation 3.
Operation
Read
Read
Write
Write
TABLE 3. P-bit Truth Table
P-bit
1
0
1
0
2
C compatible systems with
(don’t turn off the device)
Programming Ready
Programming Busy
FIGURE 8. Typical Application Driving a V
EEPROM Write
Register Write
Description
FIGURE 7. Programmable Current Sink
(3)
12
Typical Application
The following section discusses two typical applications for
the LM8342. In the first application the LM8342 is used as a
programmable current sink, for example to drive a pro-
grammable bias generator. In the second application the
LM8342 is used to adjust the voltage level of a V
PROGRAMMABLE CURRENT SINK
As described in the “Principle of Operation of the LM8342”
section the LM8342 basically operates as a programmable
current sink. Figure 7 shows a general current sink applica-
tion.
DRIVING A V
Another typical application, given in Figure 8, is using the
LM8342 to adjust the “voltage tap” of a resistive voltage di-
vider. The V
cation.
COM
COM
COM
driver buffers the “voltage tap” in this appli-
Level
LEVEL
20139233
20139201
COM
driver.