Datasheet > AQ265

AQ265

更新时间： 2022-12-17 01:49:28

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ACUTECH		/
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Adjustable Hot- Cold Thermostat SOT23-5 Package

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AQ265 数据手册

Acutechnology Semiconductor Inc.

AQ265

SETTING THE COLD 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 Cold

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 -10ºC and 10ºC. If no external resistor is

selected the Cold temperature trip point will be -20ºC. For an accurate RSET email info@acutechnology.com.

RSET vs Lower Thresh.

30.0

25.0

20.0

15.0

10.0

5.0

0.0

-5.0

-10.0

-15.0

500

700

900

1100

1300

1500

1700

1900

RSET in Kohms

GRAPH.2

The AQ265 is designed to present the lowest possible current drain to the battery. ICC is less than 30µA under

all conditions. OUT pin is designed to pull down with a minimum of 200µA. To insure the desired low state

output voltage, the current required to pull down the element used to disconnect the Battery must be

determined and is referred to as I load.

Selection of the R1 pull up resistor must allow for I load when the OUT engages into the alarm state, meaning

the device is sensing temperatures outside of its set temperature window. The OT pin is guaranteed to sink a

minimum of 100µA to keep the current drain as low as possible. Therefore, I load plus I R1 must not exceed

100µA or a true logic low may not be achieved when the AQ265 alarms an out of window temperature has been

sensed.

R1= (Vbatt. min - Max. V_OUTon) / (Min. I_OUTon – (1.5* I load)) = (Vbatt. min - 0.25V) / (100µA – (1.5* I load))

Graph 3 below shows the hysteretic response of the OUT pin to temperature. In the normal range between the

Cold and Hot trip points, the AQ265 presents an open Drain high state at the OUT pin. At the cold temperature

trip point, VOUT will drop to its low state. The OUT pin will return to a high state when the AQ265 senses the

temperature has risen above the Cold trip point by + 3 degrees of hysteresis. Likewise, the AQ265 will cause

the OUT pin to go low state when the Hot temperature trip point is exceeded. OUT will return to high state when

the AQ265 senses that the temperature is below the high trip point by - 5 degrees of hysteresis.

Graph 4 shows the input current into the AQ265 and output state over the temperature range.

www.acutechnology.com

Rev. 1.5 January 31, 2007

1 2 3 456 7 8

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