ADT7420 Digital Temperature PMOD

The ADT7420 is a high accuracy digital temperature sensor offering breakthrough performance over a wide industrial range. It contains an internal band gap reference, a temperature sensor, and a 16-bit ADC to monitor and digitize the temperature to 0.0078°C resolution. The ADC resolution, by default, is set to 13 bits (0.0625°C). The ADC resolution is a user programmable mode that can be changed through the serial interface.

The ADT7420 is guaranteed to operate over supply voltages from 2.7 V to 5.5 V. Operating at 3.3 V, the average supply current is typically 210 μA. The ADT7420 has a shutdown mode that powers down the device and offers a shutdown current of typically 2.0 μA at 3.3 V. The ADT7420 is rated for operation over the −40°C to +150°C temperature range.

Pin A0 and Pin A1 are available for address selection, giving the ADT7420 four possible I2C addresses. The CT pin is an open-drain output that becomes active when the temperature exceeds a programmable critical temperature limit. The INT pin is also an open-drain output that becomes active when the temperature exceeds a programmable limit. The INT pin and CT pin can operate in comparator and interrupt event modes. website.

Hardware Setup

The PMOD board is small in size with dimensions approximately 1 inch in width by 1 inches in length. There are a few options on the hardware I'd like to point out for you, in order to use the board.

Power Supply Requirements

When using the ADT7420 PMOD board, the 3.3V power for the PMOD comes directly from the host board it is connected to. The power from the host is generally capable of providing up to 100 mA at 3.3V, but for complete PMOD power specifications please click here.

Digital Interface (PMOD)

The PMOD interface is a series of standardized digital interfaces for various digital communication protocols such as SPI, I2C, and UART. These interface types were standardized by Digilent, which is now a division of National Instruments. Complete details on the PMOD specification can be found here.

The specific interface used for the EVAL-ADT7420-PMDZ boards is the extended I2C. In general ADI has adopted the extended I2C connector for all PMOD devices which have an I2C interface. It provides flexibility to add/daisy chain multiple I2C devices onto the same bus.

P1 Pin Number	Pin Function	Mnemonic
Pin 1	Serial Clock	SCL
Pin 2	Serial Clock	SCL
Pin 3	Serial Data	SDA
Pin 4	Serial Data	SDA
Pin 5	Digital Ground	DGND
Pin 6	Digital Ground	DGND
Pin 7	Digital Power	VDD
Pin 8	Digital Power	VDD

P1 Pin Number	Pin Function	Mnemonic
Pin 1	Chip Select	/CS
Pin 2	Master Out Slave In	MOSI
Pin 3	Master In Slave Out	MISO
Pin 4	Serial Clock	SCLK
Pin 5	Digital Ground	DGND
Pin 6	Digital Power	VDD
Pin 7	Chip Select
Pin 8	Chip Select
Pin 9	Chip Select
Pin 10	Chip Select
Pin 11	Digital Ground	DGND
Pin 12	Digital Power	VDD

Getting Started

Using the EVAL-ADT7420-PMDZ is very simple. To get started measuring temperature, you are going to need the following equipment:

EVAL-AD7420-PMDZ PMOD board
EVAL-ADICUP360 Development Kit (If you order this from the website it also includes the USB to micro USB Cable)
A PC or Laptop with a USB port
USB Cable to micro USB Cable
A serial terminal program such as Putty or Tera Term

Connectors and Jumper configuration

The EVAL-ADXL362-ARDZ Shield has four jumpers to increase flexibility when stacking systems together. Each jumper and it's purpose is described below.

ADXL_CS_SEL

Configuration	Function
	Routes ADXL362 CS pin to P0.3/IRQ0/CS1
	Routes ADXL362 CS pin to P0.4/RTS/IRQ1

LCD_CS_SEL

Configuration	Function
	Connects LCD CS pin to P2.2/BM
	Connects LCD CS pin to P1.4/PWM2/MISO0.

ADXL_INT_SEL

Configuration	Function
	Connects ADXL362 Interrupt pin 1 (INT1) to P1.0/IRQ3
	Connects ADXL362 Interrupt pin 2 (INT2) to P1.0/IRQ3.

LDC_RST_SEL

Configuration	Function
	Connects LCD Reset to IOREF
	Connects LCD Reset to pin P1.1/IRQ4

Schematics, PCB Layout, Bill of Materials

EVAL-ADXL362-ARDZ Design & Integration Files

Schematics
PCB Layout and Mounting Diagram
Bill of Materials
Allegro Project

Software examples

ADXL362 Demo

Evaluation

PulSAR ADC PMOD Evaluation Software

Wiki

Analog Devices Wiki

Table of Contents

ADT7420 Digital Temperature PMOD