Acutechnology Semiconductor Inc.
AQ265
Typical Application
The device AQ265 is very simple to use. It is recommended to place the AQ265 in close proximity of the device
whose temperature is to be sensed. The device AQ265 has an open drain output, which is capable of sinking
greater than 200µA when the sensed temperature exceeds the Hot temp trip point or goes below the Cold temp
trip point. The Hot and Cold temperature trip points can be set by the addition of external resistors RSET as
depicted in FIG.1 below. 1nF capacitors must be placed from the adjust pins to ground close to the AQ265 for
noise immunity.
FIG.1
SETTING THE HOT TEMPERATURE TRIP POINT
It is assumed that the temperature coefficient of the external resistor be close to zero as it commonly is.
Higher accuracy resistors guarantee higher accuracy temperature trip point. To determine the desired Hot
temperature trip point, the resistor RSET value should be selected according to the graph below. The graph
shows the desired resistor value for the temperature range between 50ºC and 85ºC. If no external resistor is
selected, the Hot temperature trip point will be 40ºC. For an accurate RSET email
info@acutechnology.com
RSET vs Hot Thresh.
90.0
85.0
Temperature C
80.0
75.0
70.0
65.0
60.0
55.0
50.0
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
RSET in Kohms
GRAPH.1
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Rev. 1.5 January 31, 2007
ACUTECH [ ACUTECHNOLOGY SEMICONDUCTOR ]
