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LM75A: Digital temperature sensor and thermal watchdog

The LM75A is a temperature-to-digital converter using an on-chip band gap temperature sensor and Sigma-delta A-to-D conversion technique. The device is also a thermal detector providing an overtemperature detection output. The LM75A contains a number of data registers: Configuration register (Conf) to store the device settings such as device operation mode, OS operation mode, OS polarity and OS fault queue as described in Section 7 "Functional description"; temperature register (Temp) to store the digital temp reading, and set-point registers (Tos and Thyst) to store programmable overtemperature shutdown and hysteresis limits, that can be communicated by a controller via the 2-wire serial I²C-bus interface. The device also includes an open-drain output (OS) which becomes active when the temperature exceeds the programmed limits. There are three selectable logic address pins so that eight devices can be connected on the same bus without address conflict.

The LM75A can be configured for different operation conditions. It can be set in normal mode to periodically monitor the ambient temperature, or in shutdown mode to minimize power consumption. The OS output operates in either of two selectable modes: OS comparator mode or OS interrupt mode. Its active state can be selected as either HIGH or LOW. The fault queue that defines the number of consecutive faults in order to activate the OS output is programmable as well as the set-point limits.

The temperature register always stores an 11-bit 2's complement data giving a temperature resolution of 0.125 Cel. This high temperature resolution is particularly useful in applications of measuring precisely the thermal drift or runaway.

The device is powered-up in normal operation mode with the OS in comparator mode, temperature threshold of 80 Cel and hysteresis of 75 Cel, so that it can be used as a stand-alone thermostat with those pre-defined temperature set points.

LM75A: Product Block Diagram

LM75A: Block Diagram

sot096-1_3d

Data Sheets (1)

Application Notes (3)

Users Guides (3)

Brochures (3)

Selector Guides (1)

Package Information (2)

Packing (2)

Reports or Presentations (1)

Supporting Information (4)

IBIS Model

• LM75A IBIS model (REV 1.0) ibs LM75A_1 9/16/2014
• LM75ADP IBIS model (REV 1.0) ibs LM75ADP 9/19/2012

Ordering Information

Package Information

Product ID	Package Description	Outline Version	Reflow/Wave Soldering	Packing	Product Status	Part NumberOrdering code(12NC)	Marking	Chemical Content	RoHS / Pb Free / RHF	LeadFree Conversion Date	EFR	IFR(FIT)	MTBF(hour)	MSL	MSL LF
LM75AD		SOT96-1	SO-SOJ-REFLOW SO-SOJ-WAVE SO-SOJ-REFLOW SO-SOJ-WAVE	Reel 13" Q1/T1	Active	LM75AD,118 (9352 697 75118)	LM75A	LM75AD		week 17, 2005	0.0	2.0	5E8	1	1
				Bulk Pack	Active	LM75AD,112 (9352 697 75112)	LM75A	LM75AD		week 17, 2005	0.0	2.0	5E8	1	1
LM75ADP		SOT505-1	Reflow_Soldering_Profile	Reel 13" Q1/T1	Active	LM75ADP,118 (9352 697 76118)	L75A	LM75ADP		week 13, 2005	0.0	2.0	5E8	1	1
LM75ADP/DG		SOT505-1	Reflow_Soldering_Profile	Reel 13" Q1/T1	Discontinued	LM75ADP/DG,118 (9352 886 14118)	L75A	LM75ADP/DG		Always Pb-free	0.0	2.0	5E8	1	1