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This version (28 May 2013 08:58) was approved by LucianS.The Previously approved version (27 May 2013 14:41) is available.Diff

AD7780 - No-OS Driver for Renesas Microcontroller Platforms

Supported Devices

Evaluation Boards

  • PmodAD3

Overview

The AD7780 is a complete low power front-end solution for bridge sensor products, including weigh scales, strain gages, and pressure sensors. It contains a precision, low power, 24-bit sigma-delta (Σ-Δ) ADC; an on-chip, low noise programmable gain amplifier (PGA); and an on-chip oscillator.

Consuming only 330 μA, the AD7780 is particularly suitable for portable or battery-operated products where very low power is required. The AD7780 also has a power-down mode that allows the user to switch off the power to the bridge sensor and power down the AD7780 when not converting, thus increasing the battery life of the product.

For ease of use, all the features of the AD7780 are controlled by dedicated pins. Each time a data read occurs, eight status bits are appended to the 24-bit conversion. These status bits contain a pattern sequence that can be used to confirm the validity of the serial transfer.

The on-chip PGA has a gain of 1 or 128, supporting a full-scale differential input of ±5 V or ±39 mV. The device has two filter response options. The filter response at the 16.7 Hz update rate provides superior dynamic performance. The settling time is 120 ms at this update rate. At the 10 Hz update rate, the filter response provides greater than −45 dB of stop-band attenuation. In load cell applications, this stop-band rejection is useful to reject low frequency mechanical vibrations of the load cell. The settling time is 300 ms at this update rate. Simultaneous 50 Hz/60 Hz rejection occurs at both the 10 Hz and 16.7 Hz update rates.

The AD7780 operates with a power supply from 2.7 V to 5.25 V. It is available in a narrow body, 14-lead SOIC package and a 16-lead TSSOP package.

Applications

  • Weigh scales
  • Pressure Measurement
  • Industrial Process Control
  • Portable instrumentation

05 Dec 2012 09:56 · Dan Nechita

The goal of this project (Microcontroller No-OS) is to be able to provide reference projects for lower end processors, which can't run Linux, or aren't running a specific operating system, to help those customers using microcontrollers with ADI parts. Here you can find a generic driver which can be used as a base for any microcontroller platform and also specific drivers for different microcontroller platforms.

Driver Description

The driver contains two parts:

  • The driver for the AD7780 part, which may be used, without modifications, with any microcontroller.
  • The Communication Driver, where the specific communication functions for the desired type of processor and communication protocol have to be implemented. This driver implements the communication with the device and hides the actual details of the communication protocol to the ADI driver.

The Communication Driver has a standard interface, so the AD7780 driver can be used exactly as it is provided.

There are three functions which are called by the AD7780 driver:

  • SPI_Init() – initializes the communication peripheral.
  • SPI_Write() – writes data to the device.
  • SPI_Read() – reads data from the device.

SPI driver architecture

The following functions are implemented in this version of AD7780 driver:

Function Description
char AD7780_Init(void) Initializes the communication peripheral and checks if the device is present.
char AD7780_WaitRdyGoLow(void) Waits for DOUT/RDY pin to go low.
long AD7780_ReadSample(unsigned char* pStatus) Reads a 24-bit sample from the ADC.
float AD7780_ConvertToVoltage(unsigned long rawSample, float vRef, unsigned char gain) Converts the 24-bit raw value to volts.
05 Dec 2012 10:00 · Dan Nechita

Downloads

Renesas RL78G13 Quick Start Guide

This section contains a description of the steps required to run the AD7780 demonstration project on a Renesas RL78G13 platform.

Required Hardware

Required Software

Hardware Setup

A PmodAD3 has to be connected to the PMOD1 connector.

  • If using 3 external signals (AVDD, AIN and REF) then 2 jumpers on PmodAD3 must be off (JP1 and JP2).
  • If using 2 external signals (AIN and REF) or (AIN and AVDD) then 1 jumper on PmodAD3 must be off (JP2 or JP1).
  • Be aware that 0.5V ≤ Vref ≤ AVDD and 2.7V ≤ AVDD ≤ 5.25V.
  • Be aware (especially when using gain = 128) that the common-mode voltage (AIN(+) + AIN(−)) / 2 must be ≥ 0.5V.

Reference Project Overview

The reference project:

  • sets the update rate=16.7Hz and gain=1 for AD7780;
  • initiates conversions;
  • reads the captured data from AD7780 and displays it;
  • displays some features of the conversion (gain, update rate, conversion status and serial transfer status).
  • Reference voltage is 3300 mV default. If using another reference voltage, please check that the jumpers are properly set on the PmodAD3, and modify the vRef parameter in the ‘AD7780_ConvertToVoltage()’ function from ‘PmodAD3.c’.

Software Project Tutorial

This section presents the steps for developing a software application that will run on the Renesas Demo Kit for RL78G13 for controlling and monitoring the operation of the ADI part.

  • Run the IAR Embedded Workbench for Renesas RL78 integrated development environment.
  • Choose to create a new project (Project – Create New Project).
  • Select the RL78 tool chain, the Empty project template and click OK.

  • Select a location and a name for the project (ADIEvalBoard for example) and click Save.

  • Open the project’s options window (Project – Options).
  • From the Target tab of the General Options category select the RL78 – R5F100LE device.

  • From the Setup tab of the Debugger category select the TK driver and click OK.

  • Extract the files from the lab .zip archive and copy them into the project’s folder.

  • The new source files have to be included into the project. Open the Add Files… window (Project – Add Files…), select all the copied files and click open.

  • At this moment, all the files are included into the project.
  • The project is ready to be compiled and downloaded on the board. Press the F7 key to compile it. Press CTRL + D to download and debug the project.
  • A window will appear asking to configure the emulator. Keep the default settings and press OK.

  • To run the project press F5.

03 Sep 2012 13:02 · Dragos Bogdan

Renesas RL78G14 Quick Start Guide

This section contains a description of the steps required to run the AD7780 demonstration project on a Renesas RL78G14 platform using the PmodAD3.

Required Hardware

Required Software

The AD7780 demonstration project for the Renesas RL78G14 platform consists of three parts: the AD7780 Driver, the PmodAD3 Demo for RL78G14 and the RL78G14 Common Drivers.

All three parts have to be downloaded.

Hardware Setup

A PmodAD3 has to be connected to the PMOD1 connector (see image below).

  • If using 3 external signals (AVDD, AIN and REF) then 2 jumpers on PmodAD3 must be off (JP1 and JP2).
  • If using 2 external signals (AIN and REF) or (AIN and AVDD) then 1 jumper on PmodAD3 must be off (JP2 or JP1).
  • Be aware that 0.5V ≤ Vref ≤ AVDD and 2.7V ≤ AVDD ≤ 5.25V.
  • Be aware (especially when using gain = 128) that the common-mode voltage (AIN(+) + AIN(−)) / 2 must be ≥ 0.5V.

Reference Project Overview

The reference project:

  • sets the update rate=16.7Hz and gain=1 for AD7780;
  • initiates conversions;
  • reads the captured data from AD7780 and displays it;
  • displays some features of the conversion (gain, update rate, conversion status and serial transfer status).
  • Reference voltage is 3300 mV default. If using another reference voltage, please check that the jumpers are properly set on the PmodAD3, and modify the vRef parameter in the ‘AD7780_ConvertToVoltage()’ function from ‘PmodAD3.c’.

Software Project Tutorial

This section presents the steps for developing a software application that will run on the Renesas Demo Kit for RL78G14 for controlling and monitoring the operation of the ADI part.

  • Run the IAR Embedded Workbench for Renesas RL78 integrated development environment.
  • Choose to create a new project (Project – Create New Project).
  • Select the RL78 tool chain, the Empty project template and click OK.

  • Select a location and a name for the project (ADIEvalBoard for example) and click Save.

  • Open the project’s options window (Project – Options).
  • From the Target tab of the General Options category select the RL78 – R5F104PJ device.

  • From the Setup tab of the Debugger category select the TK driver and click OK.

  • Copy the downloaded files into the project's folder.

  • The new source files have to be included into the project. Open the Add Files… window (Project – Add Files…), select all the copied files and click open.

  • At this moment, all the files are included into the project.
  • The project is ready to be compiled and downloaded on the board. Press the F7 key to compile it. Press CTRL + D to download and debug the project.
  • A window will appear asking to configure the emulator. Keep the default settings and press OK.

  • To run the project press F5.

09 May 2013 17:10 · Dragos Bogdan

More information

01 Jun 2012 12:17