TMP01FJ - Low Power Programmable Temperature Controller

GENERAL DESCRIPTION 

The TMP01 is a temperature sensor that generates a voltage 

output proportional to absolute temperature and a control 

signal from one of two outputs when the device is either above 

or below a specific temperature range. Both the high/low 

temperature trip points and hysteresis (overshoot) band are 

determined by user-selected external resistors. For high volume 

production, these resistors are available on board. 

The TMP01 consists of a band gap voltage reference combined 

with a pair of matched comparators. The reference provides 

both a constant 2.5 V output and a voltage proportional to 

absolute temperature (VPTAT) which has a precise temperature 

coefficient of 5 mV/K and is 1.49 V (nominal) at 25°C. The 

comparators compare VPTAT with the externally set temperature trip points and generate an open-collector output signal 

when one of their respective thresholds has been exceeded. 

Hysteresis is also programmed by the external resistor chain 

and is determined by the total current drawn out of the 2.5 V 

reference. This current is mirrored and used to generate a 

hysteresis offset voltage of the appropriate polarity after a 

comparator has been tripped. The comparators are connected 

in parallel, which guarantees that there is no hysteresis overlap 

and eliminates erratic transitions between adjacent trip zones. 

The TMP01 utilizes proprietary thin-film resistors in conjunction with production laser trimming to maintain a temperature 

accuracy of ±1°C (typical) over the rated temperature range, 

with excellent linearity. The open-collector outputs are capable 

of sinking 20 mA, enabling the TMP01 to drive control relays 

directly. Operating from a 5 V supply, quiescent current is only 

500 μA (max). 

The TMP01 is available in 8-pin mini PDIP, SOIC, and TO-99 

packages.

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