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MAX31865ATP

RTD-to-digital converter, PT100/PT1000, 15-bit, SPI, TQFN-20, 2/3/4-wire, fault detect

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制造商零件：

MAX31865ATP

包装：

TQFN-20 (5.00 x 5.00 x 0.80 mm, 0.65mm pitch, exposed pad)

品牌：

产品类别：

集成电路 IC, Static Random Access Memory (SRAM)

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说明

产品概览

The MAX31865ATP from Maxim Integrated (now Analog Devices) is an RTD-to-digital converter in a TQFN-20 package. It simplifies precision temperature measurement using PT100/PT1000/PT500 RTD sensors with 15-bit resolution and SPI interface.

主要规格

RTD Type	PT100, PT1000, PT500
Resolution	15-bit (0.03C for PT100)
Accuracy	+/-0.5C (RTD accuracy dependent)
Interface	SPI (up to 5MHz)
Excitation Current	Programmable (0.5mA, 1mA, 2mA)
工作温度	-40C to +125C

特点

Supports PT100, PT500, and PT1000 RTD sensors with automatic conversion
15-bit ADC resolution for 0.03C temperature resolution (PT100)
Programmable excitation current to match RTD type and wiring
SPI interface for easy MCU integration at up to 5MHz
Automatic RTD and fault detection with open/short circuit alerts
2-wire, 3-wire, and 4-wire RTD connection support

应用

Industrial temperature measurement with PT100/PT1000 RTDs
Medical temperature monitoring and calibration
Food processing and cold chain temperature logging
Scientific instrumentation and laboratory equipment

产品介绍：MAX31865ATP 产品介绍

The MAX31865ATP from Maxim Integrated (now Analog Devices) is a dedicated RTD-to-digital converter that simplifies precision temperature measurement using platinum RTD sensors. The device integrates a precision excitation current source, a 15-bit delta-sigma ADC, and all necessary signal conditioning to convert the RTD resistance directly to a digital value accessible via SPI. Supporting PT100, PT500, and PT1000 RTD types with 2-wire, 3-wire, and 4-wire connection configurations, the device accommodates various sensor installations from simple to high-precision. The programmable excitation current (0.5mA, 1mA, or 2mA) optimizes the voltage drop across the RTD for the ADC range while minimizing self-heating. The 15-bit ADC provides 0.03C resolution for PT100 sensors, enabling precise temperature control and monitoring. An internal reference resistor sets the conversion ratio, and the SPI interface (up to 5MHz) provides easy readout of the RTD resistance ratio. Built-in fault detection circuitry identifies open or shorted RTD connections, RTD out-of-range conditions, and reference resistor faults, providing diagnostic information for system reliability.

工作原理：MAX31865ATP 工作原理

The MAX31865ATP uses a ratiometric measurement technique for RTD-to-digital conversion. (1) Excitation: A programmable precision current source drives current through the RTD sensor. The current also flows through a precision reference resistor (RREF) connected between the RTDI and RTDIN- pins. (2) Ratiometric ADC: The delta-sigma ADC measures the voltage across the RTD (RTDIN+ to RTDIN-) and the voltage across the reference resistor (REFIN+ to REFIN-). Since both voltages are proportional to the same excitation current, the ratio RTD/RREF is independent of the exact current value. This eliminates errors from excitation current drift. (3) Conversion: The 15-bit ADC provides a digital output proportional to the RTD resistance. The RTD resistance is calculated as RRTD = (ADC_Code / 2^15) x RREF. Temperature is then derived from the RTD resistance using the Callendar-Van Dusen equation or a lookup table. (4) Wire Compensation: For 3-wire RTDs, the device measures the lead resistance during one phase and compensates. For 4-wire RTDs, Kelvin sensing eliminates lead resistance effects entirely. (5) Fault Detection: The device monitors for open RTD (no current flow), shorted RTD (zero resistance), and reference resistor faults, reporting these via the fault register.

引脚说明：MAX31865ATP 引脚定义和功能

针脚	名称	类型	功能
1	CLK	输入	SPI clock
2	DIN 标准	输入	SPI data input
3	DOUT	输出	SPI data output
4	CS	输入	Chip select (active low)
5	DRDY	输出	Data ready (active low)
6	RTDIN+	输入	RTD positive input
7	RTDIN-	输入	RTD negative input
8	REFIN+	输入	Reference resistor positive
9	REFIN-	输入	Reference resistor negative
10	RTDI	输出	RTD excitation current output

Application Scenarios:In which products and applications isMAX31865ATP 中古

Industrial temperature measurement with PT100/PT1000 RTDs at 0.03C resolution
Medical temperature monitoring and calibration with fault detection
Food processing and cold chain temperature logging with 3-wire compensation
Scientific instrumentation and laboratory equipment with 15-bit ADC

Alternative Models:What chips are recommended as replacements for MAX31865ATP

制造商	部件编号	包装	说明
TI	ADS1220IPWR	TSSOP-16	24-bit, RTD + thermocouple
ADI	AD7124-4BCPZ	LFCSP-24	24-bit, 4-ch, low power
微型芯片	MCP3550-50-E/SN	SOIC-8	22-bit, 50/60Hz rejection
马克西姆	MAX31865ATP+	TQFN-20	Same part, different packaging

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MAX31865ATP

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