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SE95: Ultra high accuracy digital temperature sensor and thermal watchdog

The SE95 is a temperature-to-digital converter using an on-chip band gap temperature sensor and Sigma Delta analog-to-digital conversion technique. The device is also a thermal detector providing an overtemperature detection output.

The SE95 contains a number of data registers accessed by a controller via the 2-wire serial I²C-bus interface:

The device includes an open-drain output (pin OS) which becomes active when the temperature exceeds the programmed limits. There are three selectable logic address pins (pins A2 to A0) so that eight devices can be connected on the same bus without address conflict.

The SE95 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 and 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 a 13-bit two's complement data giving a temperature resolution of 0.03125 Cel. This high temperature resolution is particularly useful in applications of measuring precisely the thermal drift or runaway. For normal operation and compatibility with the LM75A, only the 11 MSBs are read, with a resolution of 0.125 Cel to provide the accuracies specified. To be compatible with the LM75, read only the 9 MSBs.

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. The conversion rate is programmable, with a default of 10 conversions/s.

SE95: Product Block Diagram

sot096-1_3d

Data Sheets (1)

Application Notes (3)

Users Guides (3)

Brochures (2)

Selector Guides (1)

Package Information (2)

Packing (2)

Supporting Information (4)

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
SE95D		SOT96-1	SO-SOJ-REFLOW SO-SOJ-WAVE SO-SOJ-REFLOW SO-SOJ-WAVE	Reel 13" Q1/T1	Active	SE95D,118 (9352 741 41118)	SE95	SE95D		week 13, 2005	0.0	4.0	2.5E8	1	1
				Bulk Pack	Active	SE95D,112 (9352 741 41112)	SE95	SE95D		week 13, 2005	0.0	4.0	2.5E8	1	1
SE95DP		SOT505-1	Reflow_Soldering_Profile	Reel 13" Q1/T1	Active	SE95DP,118 (9352 741 42118)	SE95	SE95DP		week 13, 2005	0.0	4.0	2.5E8	1	1