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Serially Accessible Digital Temperature Sensor MICROCHIP TC74A5-3.3VAT for Embedded System Temperature Monitoring

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Serially Accessible Digital Temperature Sensor MICROCHIP TC74A5-3.3VAT for Embedded System Temperature Monitoring

Voltage - Supply : 2.7V~5.5V

Description : 2.7V~5.5V TO-220-5 Analog and Digital Output RoHS

Mfr. Part # : TC74A5-3.3VAT

Model Number : TC74A5-3.3VAT

Package : TO-220-5

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Product Overview

The TC74 is a serially accessible, digital temperature sensor designed for low-cost, small-form-factor applications. It converts temperature data from an onboard thermal sensing element into an 8-bit digital word. Communication is achieved via a 2-wire SMBus/I2C compatible serial port, enabling multi-drop/multi-zone monitoring. The device offers a low-power Standby mode, activated by the SHDN bit in the CONFIG register. With a temperature resolution of 1C and a nominal conversion rate of 8 samples/sec, the TC74 is ideal for implementing thermal management in various systems.

Product Attributes

Brand: Microchip Technology Inc.
Origin: Not specified
Material: Not specified
Color: Not specified
Certifications: Not specified

Technical Specifications

Parameter	Symbol	Min	Typ	Max	Units	Conditions
Absolute Maximum Ratings
Supply Voltage	VDD			+6	V
Voltage On Any Pin		(GND 0.3V)		(VDD + 0.3V)	V
Current On Any Pin				50	mA
Operating Temperature	TA	-40		+125	C
Storage Temperature	TSTG	-65		+150	C
Junction Temperature	TJ			+150	C
DC Characteristics
Power-on Reset Threshold	VPOR	1.2		2.2	V	VDD Falling Edge or Rising Edge
Supply Voltage	VDD	2.7		5.5	V	Note 5
Operating Current	IDD		200	350	A	VDD = 5.5V, Note 1
Standby Supply Current	IDD-STANDBY		5.0	10	A	VDD = 3.3V, Serial Port Inactive, Note 4
Temperature Accuracy	TERR	-2.0		+2.0	C	+25C <TA < +85C
Temperature Accuracy	TERR	-3.0		+3.0	C	0C < TA < +125C
Conversion Rate	CR	4	8		SPS	Note 2
Logic Input High	VIH	0.8 x VDD			V
Logic Input Low	VIL			0.2 x VDD	V
SDA Output Low	VOL			0.4	V	IOL = 3 mA
SDA Output Low	VOL			0.6	V	IOL = 6 mA, Note 3
Input Capacitance	CIN		5.0		pF	SDA, SCLK
I/O Leakage	ILEAK	-1.0	0.1	1.0	A
AC Timing
SMBus/I2C Clock Frequency	fSMB	10		100	kHz
Low Clock Period	tLOW	4.7			sec
High Clock Period	tHIGH	4.0			sec
SMBus/I2C Rise Time	tR			1000	nsec	10% to 90%
SMBus/I2C Fall Time	tF			300	nsec	90% to 10%
START Condition Setup Time	tSU(START)	4.0			sec	90% SCLK to 10% SDA
START Condition Hold Time	tH(START)	4.0			sec
Data In Setup Time	tSU-DATA	1000			nsec
Data In Hold Time	tH-DAT	1250			nsec
STOP Condition Setup Time	tSU(STOP)	4.0			sec
Bus Free Time Prior to New Transition	tIDLE	4.7			sec
Power-on Reset Delay	tPOR		500		sec	VDD VPOR (Rising Edge)

Notes:
1: Operating current is an average value integrated over multiple conversion cycles. Transient current may exceed this specification.
2: Maximum ensured conversion time after Power-on Reset (POR to DATA_RDY) is 250 msec.
3: Output current should be minimized for best temperature accuracy. Power dissipation within the TC74 will cause self-heating and temperature drift error.
4: SDA and SCLK must be connected to VDD or GND.
5: VDD = 3.3V for TC74AX-3.3VXX. VDD = 5.0V for TC74AX-5.0VXX. All part types of the TC74 will operate properly over the wider power supply range of 2.7V to 5.5V. Each part type is tested and specified for rated accuracy at its nominal supply voltage. As VDD varies from the nominal value, accuracy will degrade 1C/V of VDD change.

2410121852_MICROCHIP-TC74A5-3-3VAT_C641452.pdf

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