User Documentation¶

Release:	1.1.1
Date:	August 07, 2014

Introduction¶

Maxim’s Mojave (MAXREFDES42#) reference design features a resistance to digital temperature sensor which can also detect multiple faults. The IO-Link communication protocol enables quick sensor configuration and reduces cabling while featuring a robust, medium speed, communication protocol with power, enabling higher powered sensors than a 4-20mA loop.

Board Specification¶

Item	Specification
Oscillator Frequency	18.432MHz
Microcontroller	Renesas RL78/G1A (R5F10E8EALA)
DC Power	24V via M12 Connector
LEDs	Power indicator: Green x1 IO-Link indicator: Amber x1 Digital output indicator: Red x1
IO-link Connector	Male M12 4-pole A-coded
IO-Link PHY	Maxim MAX14821EWA+
RTD-to-Digital Converter	MAX31865ATP+
SPI 3.3V/5V Level Shifter	MAX1841EUB
Dot Addressable Display	SCE5744 Z

Project Goal¶

The purpose of this project is by giving the user a strong basis to start develop production-ready IO-Link® application based on Maxim Integrated IO-Link device transceiver (MAX14821), a Renesas ultra-low-power, 16-bit microcontroller (RL78) and iqStack® IO-Link Device Stack.

Sensor Logic¶

In iqMAXREFDES42 have been implemented simple switch-point hysteresis logic and additionally can be configured as normally open (NO) or normally closed (NC).

By default ambient temperature switch-point settings (32767 is the maximal value):

What	SP (Level)	Hysteresis	Mode
Ambient temperature	9148 (0x23BC, 30°C/86°F)	32 (0x20, 1°C/1.8°F)	Normally Open (NO)

Note

Ambient temperature switch-point flag always indicated on digital output channel (red LED).

IO-Link Application¶

iqMAXREFDES42 communicates with an IO-Link Master on COM3 transmission rate (230,4kbit/s).

Process Data In¶

Bits    23  22  21  20  19  18  17  16  15  14  13  12  11  10   9   8       7   6   5   4   3   2   1   0
       +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+   +---+---+---+---+---+---+---+---+
  MSB  | x |       ambient temperature process value (15bits)          |   | x | x | x | x | x | x | x | F |  LSB
       +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+   +---+---+---+---+---+---+---+---+
                                                                                                         |
                                             temperature process value switch-point flag (FALSE/TRUE) ---+

Process Data Out¶

Be absent.

Commands¶

Can be run by IO-Link Index 0x0002:

Value	Description
128 (0x80)	Device Reset
160 (0xA0)	Tech-in ambient temperature switch-point level (see IO-Link index 0x0100 below)

Parameters¶

IO-Link index	Mode	Description	Default value
16 (0x0010)	read-only	Vendor Name	Maxim Integrated
17 (0x0011)	read-only	Vendor Text	The world leader in analog integration
18 (0x0012)	read-only	Product Name	Mojave (MAXREFDES42#)
19 (0x0013)	read-only	Product ID	MAXREFDES42
20 (0x0014)	read-only	Product Text	IO-Link RTD Temp Sensor
23 (0x0017)	read-only	Firmware Revision	v 1.1.1
256 (0x0100)	read/write	Ambient temperature switch-point level	9148 (0x23BC, 30°C/86°F)
257 (0x0101)	read/write	Ambient temperature switch-point hysteresis	32 (0x20, 1°C/1.8°F)
258 (0x0102)	read/write	Display’s temperature scale (0 - °F, 1 - °C)	1 (0x01)
259 (0x0103)	read/write	N-wire type connection (2, 3, 4)	2
260 (0x0104)	read/write	MAX31865ATP+ Configuration register	0xCO (2-wire or 4-wire auto conversion mode)
261 (0x0105)	read-only	MAX31865ATP+ RTD (2 bytes)	0
262 (0x0106)	read/write	MAX31865ATP+ High Fault Threshold (2 bytes)	0xFFFF
263 (0x0107)	read/write	MAX31865ATP+ Low Fault Threshold (2 bytes)	0
264 (0x0108)	read-only	MAX31865ATP+ Fault Status register	0x00

Events¶

Event code	Description
0x4210	Device temperature over-run
0x5000	Device hardware fault
0x5111	Primary supply voltage under-run
0x6000	Device software fault
0x7710	Short circuit

Installation Details¶

There are two ways to experiment with MAXREFDES42#:

Upload Firmware HEX-file, connect a device to IO-Link Master and play around.
Clone the source code from Bitbucket repository, go throw and try to debug.

Firmware¶

Firmware HEX-file, IODDs data and this document in PDF format can be downloaded from the Bitbucket repository absolutely free without registration.

To upload HEX-file into MAXREFDES23 have to get Renesas E1 emulator and also Renesas Flash Programmer.

Source Code¶

The project source code can be cloned from the Bitbucket repository freely without registration.

Download a trial version of IAR RL78 Embedded Workbench IDE in order to compile it and also take a look for Renesas Application Leading Tool (Applilet).

Also the Renesas E1 emulator and Renesas Flash Programmer needed to start debug session with a device.

Troubleshooting¶

If during power-on self-test (POST) hardware fails were occurred, then the main sensor application will not started and instead a first appeared hardware fail number was blinked on digital output red-indicator channel continuously and also was displayed on LCD.

Blinks Count	Fail Description
1	Renesas RL78 Illegal memory access (a firmware error, contact with developers)
2	Renesas RL78 RAM parity check (a firmware error, contact with developers)
3	Renesas RL78 Illegal instruction (a firmware error, contact with developers)
4	Maxim MAX14821EWA+ selfcheck (the chip is possibly corrupt, try to restart the device)
5	Maxim MAX31865ATP+ selfcheck (the chip is possibly corrupt, try to restart the device)

Changelog¶

v1.1.1 (2014-07-28)¶

Improvements:

(#4) Callendar-Van Dusen equation

v1.1 (2014-06-07)¶

Breaking changes:

(#3) MAX31865ATP+ RTD-to-Digital Converter registers are available as IO-Link parameters

(#6) Switch N-wire connection type via an IO-Link parameter

Improvements:

(#5) IODD picture and icon was added

v1.0 (2014-05-17)¶

New features:

Hardware setups:

Renesas RL78/G1A (R5F10E8EALA) microcontroller (with Applilet3 support, see ‘src\applilet3_src’)

MAX14821EWA+ IO-Link Device Transceiver (SPI/UART, see ‘src\hw_drivers\c_max1482x.*’)

MAX31865ATP+ RTD-to-Digital Converter (SPI, see ‘src\hw_drivers\c_max31865.*’)

SCE574x 4-Character 5x7 Dot Matrix Serial Input Dot Addressable Display (SPI, see ‘src\hw_drivers\c_sce574x.*’)

Porting IO-Link iqStack(R) Device and set up the IO-Link communication (see ‘src\applilet3_src\r_main.c’)

Write a simple IO-Link resistor temperature detector Application (with appropriate IODDs, see ‘src\sensor_appl.c’)

Glossary¶

RTD: Short for resistor temperature detector.
PV: Short for process value.
resistor temperature detector: Temperature sensor that operates on the measurement principle that a material’s electrical resistance changes with temperature.
process value: Internal unsigned numeric number, must be converted in order to display a required physical value.

License¶

All source files with the correspondent header notes are the subject to the IQ² Development GmbH terms and conditions defined in file Allgemeine Vertragsbedingungen.pdf.

For any other details please contact with us.