1.0 Introduction
The LM26LV Evaluation Board offers the
user a convenient way to experiment with
the operation of the LM26LV Temperature
Switch and Temperature Sensor.
There are jumpers that allow the insertion of
an output series resistor, the measurement
of IDD, and the selection of the TRIP TEST
mode.
By default, jumpers J3 (IDD) and J4
(VOUT) are installed. Resistor R3 can be
installed and J4 removed to insert it in
series with the output. See the datasheet for
recommended values for R3. By default J2
is left open but a jumper is provided so that
the user can use the TRIP TEST mode.
Note that R1 is only in the circuit for
protection. This resistor is not required in
actual operation. The TRIP TEST Pin can
be connected directly to VDD to select the
TRIP TEST Mode.
R2, the pull-up resistor for the open-drain
output OVERTEMP#, is 100k on the board.
See the datasheet for more details about this
value. If this pin is not used by the customer
it may be left open.
The block diagram below shows the
jumpers in the default condition.
1.1 Block Diagram
LM26LV
Under Test
J1
J4
R3
Optional Resistor
4
2
6
1
VDD GND
5
3
J5
J3
IDD
OVERTEMP
OVERTEMP
Default =
Jumpered
J2
TRIP
TEST
Default = Not
Jumpered
TRIP TEST
Default =
Jumpered
R2
100k
R1
100k
TRIP TEST
©
Copyright 2007 National Semiconductor Corporation
4
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