Details

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Parameter	Symbol	Conditions	Min	Typ	Max	Unit
Supply Voltage	VDD	Operating	2.7	3.3	5.5	V
Supply Current (Active)	IDD	10 SPS, 3.3V	-	1.1	-	mA
Supply Current (Shutdown)	IDD		-	0.01	-	渭A
Differential Input Range	VIN+/-		-0.3	-	0.3	V
Output Data Rate	ODR		0.49	4.9	50	SPS
RTD Bias Current	IBIAS		140	350	560	渭A
Fault Detection Time	tFD		-	64	-	ms
Conversion Time	tCONV	10 SPS	-	100	-	ms
Temperature Range	T	Operating	-40	-	125	掳C

Instructions for Using the MAX31865ATP

1. Power Supply:

   • Connect the VDD pin to a power supply within the range of 2.7V to 5.5V.
   • Connect the GND pin to the ground.

2. RTD Connection:

   • Connect the RTD sensor to the differential input pins (VIN+ and VIN-).
   • Ensure the RTD bias current is set appropriately for your application (140渭A to 560渭A).

3. Configuration:

   • Use the configuration register to set the output data rate (ODR), fault detection settings, and other parameters.
   • Access the configuration register via the SPI interface.

4. Data Conversion:

   • Initiate a conversion by writing to the appropriate register or using the auto-conversion mode.
   • The conversion time is typically 100ms at 10 SPS.

5. Reading Data:

   • After the conversion is complete, read the temperature data from the appropriate registers.
   • The data is provided in a digital format, typically in 16-bit resolution.

6. Fault Detection:

   • Monitor the fault status register to check for any faults such as open circuit, short circuit, or over/under temperature conditions.
   • The fault detection time is approximately 64ms.

7. Shutdown Mode:

   • To reduce power consumption, put the device into shutdown mode by setting the appropriate bit in the configuration register.
   • The supply current in shutdown mode is approximately 0.01渭A.

8. Temperature Compensation:

   • For accurate temperature measurements, use the built-in temperature compensation features or apply external calibration if necessary.

9. Operating Temperature:

   • Ensure the device operates within the temperature range of -40掳C to 125掳C to maintain accuracy and reliability.

10. SPI Communication:

    • Use the SPI interface to communicate with the MAX31865ATP. Ensure the clock frequency is within the supported range and follow the SPI protocol for reading and writing registers.

(For reference only)