AMS AS5048 Eval-Kit Manuel

Eval Kit Manual

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ams Eval Kit Manual, Confidential

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[v1-3] 2014-Aug-01

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AS5048

Adapter Board

AS5048-EK-AB

AS5048 Adapter Board

ams Eval Kit Manual, Confidential

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[v1-3] 2014-Aug-01

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Table of Contents

1Introduction .......................................................................................................................... 3

1.1 Kit Content ........................................................................................................................... 3

2Board Description................................................................................................................. 4

2.1 Mounting the AS5048 adapter board................................................................................... 5

3AS5048 adapter board and pinout....................................................................................... 6

4Operation cases................................................................................................................... 7

4.1 One Device SPI mode, unidirectional –3 wire .................................................................... 7

4.2 One device SPI mode, bidirectional –4 wire....................................................................... 8

4.3 Multi devices SPI Daisy chain mode.................................................................................... 9

5Software example source code.......................................................................................... 10

6AS5048-EK-AB Hardware.................................................................................................. 12

6.1 AS5048-EK-AB schematics ...............................................................................................12

6.2 AS5048-EK-AB PCB layout ............................................................................................... 13

7Ordering & Contact Information .........................................................................................14

8Copyrights & Disclaimer.....................................................................................................15

Revision History

Revision

Date

Owner

Description

1.0

01.10.2009

Initial version

1.1

18.10.2013

azen

Updated to new template

1.2

14.01.2013

rph

Minor corrections in section 4.1

1.3

01.07.2014

mzie

Updated ordering code, added section 1.1,

updated figure 2-9, updated source code

AS5048 Adapter Board

ams Eval Kit Manual, Confidential

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1 Introduction

The AS5048 adapter board is a small PCB allowing simple and quick testing or evaluation of the

AS5048 magnetic position sensor without the need to build a test fixture or design an own PCB.

1.1 Kit Content

Figure 1: Kit Content

Pos.

Item

Comment

AS5048 adapter board

P1 unpopulated

Magnet AS5000-MD6H-2

Diametric Magnet, D6x2.5mm, NdFeB, Bomatec AG

AS5048 Adapter Board

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2 Board Description

The PCB can either be connected to an external microcontroller or to the Universal Connector

Board (AS5xxx-UCB) in combination with a NI USB-8451 box and a provided LabVIEW software.

P1 has to be populated with a 1x8 pin header and is required for power supply as well as SPI/I2C

and PWM interfaces.

The PCB is available in two versions. Either populated with an AS5048A with SPI or AS5048B with

I2C interface.

Figure 2: AS5048 adapter board

P1 connector

(Not populated)

AS5048

4x2.6mm

Mounting holes

AS5048 Adapter Board

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2.1 Mounting the AS5048 adapter board

Figure 3: Mounting and dimensions

A 6x2.5mm diametric magnet must be placed over or under the AS5048 sensor, and should be

centered on the middle of the package with a tolerance of 0.5mm. The airgap between the

magnet surface and the package should be maintained in the range 0.5mm to 3mm. The magnet

holder must not be ferromagnetic. Materials as brass, copper, aluminum, stainless steel are the

best choices to make this part.

3.3V

PWM

SDA/CSn

SCL/SCK

A1/MOSI

A2/MISO

GND

22mm

28mm

11mm

4x2.6mm

AS5048

0.5-3mm

AS5048

AS5048 Adapter Board

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3 AS5048 adapter board and pinout

Figure 4: AS5048 adapter board connectors and encoder pinout

Pin#

Board

Pin#

AS5048

Symbol Board

Description

P1 –1

Supply voltage

P1 –2

3.3V

3V-Regulator output; internally regulated from VDD.

Connect to VDD for 3V supply voltage

P1 –3

PWM

Pulse width modulation output

P1 –4

SDA/CSn

SPI chip select-active low; shared with I2C data pin

P1 –5

SCL/SCK

SPI clock input; shared with I2C clock input

P1 –6

A1/MOSI

SPI master out/slave in; shared with I2C address

selection pin 1

P1 –7

A2/MISO

SPI master in/slave out; shared with I2C address

selection pin 2

P1 –8

GND

Supply ground

AS5048

3.3V

PWM

SDA/CSn

SCL/SCK

A1/MOSI

A2/MISO

GND

AS5048

SDA/CSn

SCL/CLK

A2/MISO

A1/MOSI

TEST

PWM

GND

VDD3V

VDD5V

TEST

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4 Operation cases

The most complete and accurate solution for a MCU to read the angle of a magnet is the SPI

interface.

4.1 One Device SPI mode, unidirectional –3 wire

The AS5048-EK-AB can be directly connected to an industry standard SPI port of a microcontroller.

The minimum connection requirement for unidirectional communication (angle + alarm values

reading) between the microcontroller and the AS5048 are MISO, SCK, SS/.

The angle will be read at each 16-bit SPI transfer. See AS5048 datasheet register table, register

3FFFh.

Figure 5: Using the SPI Interface unidirectional with a microcontroller

AS5048

3.3V

PWM

SDA/CSn

SCL/SCK

A1/MOSI

A2/MISO

GND

Regulated

Power Supply

3-3.6V

GND

MISO

MOSI

SCK

SS/

GND

VDD

MCU

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4.2 One device SPI mode, bidirectional –4 wire

If other registers than only angle values have to be read, or in order to write registers into the

AS5048, the signal MOSI is necessary.

Figure 6: Using the SPI Interface biidirectional with a microcontroller

AS5048

3.3V

PWM

SDA/CSn

SCL/SCK

A1/MOSI

A2/MISO

GND

Regulated

Power Supply

3-3.6V

GND

MISO

MOSI

SCK

SS/

GND

VDD

MCU

AS5048 Adapter Board

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4.3 Multi devices SPI Daisy chain mode

The AS5048 can be daisy chained, using 4 wires only for SPI communication.

In this configuration with n x encoders, the sequence will be processed as follow:

- MCU sets SS/ = 0

- MCU shifts n x 16-bit (e.g. READ command FFFFh) through the chain

- MCU sets SS/=1

At that point all the n x encoders have received the READ command FFFFh.

- MCU sets SS/=0

- MCU shifts n x 16-bit (e.g. NOP command 0000h)

- MCU sets SS/=1

At that point the n x 16-bit received on MISO are the n x angle values.

Figure 7: Multi Devices in Daisy chain mode

AS5048

3.3V

PWM

SDA/CSn

SCL/SCK

A1/MOSI

A2/MISO

GND

Regulated

Power Supply

3-3.6V

GND

AS5048

3.3V

PWM

SDA/CSn

SCL/SCK

A1/MOSI

A2/MISO

GND

MISO

MOSI

SCK

SS/

GND

VDD

MCU

AS5048 Adapter Board

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5 Software example source code

The following source code shows a 4-wire SPI application case.

/*!

*****************************************************************************

* \brief Reads out chip data via SPI interface

* This function is used to read out cordic value from chips supporting SPI

* interface.

* After calling this function the data can be displayed using #displayData.

* \param[in] die : index of the die to read out.

* \param[out] dd : Buffer of type #t_displayData where the read out data

* will be written to.

*****************************************************************************

static void spiReadData(u8 die, t_displayData * dd)

{

umword i;

u16 dat;

u16 agcreg;

#ifdef AS5048_CHIPDESCRIPTION

u16 magreg;

#endif

PARAMETER_UNUSED(die);

dd->angleprec = 0;

/* read agc value */

for (i = 0; i < 2; i++)

{

/* the result is available only just in the second transfer.

transfers must be separated by chip selects */

dat = SPI_CMD_READ | SPI_REG_AGC;

dat |= spiCalcEvenParity(dat);

spiTransfer((u8*)&dat, sizeof(u16));

}

agcreg = dat;

#ifdef AS5048_CHIPDESCRIPTION

for (i = 0; i < 2; i++)

{

/* the result is available only just in the second transfer.

transfers must be separated by chip selects */

dat = SPI_CMD_READ | SPI_REG_MAG;

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