MX8683RTR Datasheet MX8683R, MX8683RTR | P1-P3

IXYS

MX8683 1 03/03/08

Drawing No. 0868309 www.claremicronix.com

MX8683

10-Bit Digital Output Magnetic Flux Sensor

±200 Gauss / 20KHz Conversion Rate

Features:

• Single 5 Volt Power Supply

• Externally Configurable ±20A Bi-Direction

Current Sense per Turn

• 12-bit Serial Digital Output / 10-bit ADC

• Full Scale Magnetic Flux Intensity of ±200

Gauss

• 20K Conversions/Second

• Microcontroller Compatible

• Standard 3 Wire Serial Interface plus Chip

Select

• In System Calibration: OTP Full Scale Trim via

the Serial I/O Port

• Programmable Digital Filter Time Constant

• 4mm x 4mm 8 Lead DFN package RoHS

Compliant

Applications:

• Load Detection and Management

• Motor Control

• Power Supplies

Ordering Information

Part No. Description

Qty

MX8683R DFN-8 Tube 91

MX8683RTR DFN-8 Tape & Reel 2500

General Description

The MX8683 is a 10-bit Digital Output Magnetic Flux

Sensor. The device is a complete sampled data

subsystem that converts a magnetic flux intensity of

±200 Gauss full scale into a 12-bit format digital

output word, (10-bit resolution). The sensor

operates as a slave on the serial interface with TTL-

level compatible inputs SDI (serial data input), SCK

(serial clock), and CS* (chip select, active low).

Terminal SDO is the tri-state serial data output.

An optional exponentially weighted moving average

digital filter is included that averages the 10-bit ADC

output into a 12-bit output word. The digital filter has

a transfer function equivalent to a first order low

pass filter.

The full scale trim and/or the digital filter time

constant are controllable through the serial I/O

interface and are one-time programmable through

the serial interface (once programmed, the values

are loaded at every power-on).

The MX8683 can be mounted onto a PCB or

incorporated into a magnetic assembly and then

calibrated in-system through the serial interface.

The operating voltage range is 4.5V to 5.5V.

Functional Block Diagram Typical Application Circuit

PWR

GND

Hall

Plate

I/O Reg

10-Bit A/D

SDI

SCK

SDO

CS*

Microcontroller

MX8683

Power

Ground

PWR

CS*

SDI

SCK

GND

SDO

MISO

Select

MOSI

SCK

MX8683

IXYS

Absolute Maximum Ratings

= +25°C unless otherwise noted

Absolute Maximum Ratings are stress

ratings. Stresses in excess of these ratings

can cause permanent damage to the device.

Functional operation of the device at these or

any other conditions beyond those indicated

in the operational sections of this data sheet

is not implied. Exposure of the device to the

absolute maximum ratings for an extended

period may degrade the device and affect its

reliability.

Parameter Min Max Unit

Voltage (Any Pin to GND) +7 V

, DFN-8 Package 30 °C/W

Operating Temperature Range -40 +85 °C

Storage Temperature Range -65 150 °C

ESD Warning

ESD (electrostatic discharge) sensitive device. Although the MX8683 features proprietary ESD protection circuitry,

permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD

precautions are recommended to avoid performance degradation or loss of functionality.

Electrical Characteristics

PWR= 5V, T = +25°C

Parameter Condition Min Typ Max Unit

Operating Voltage Range (PWR) 4.5 5.5 V

Supply Current (I

PWR

) 3 mA

Average A/D Reading Zero Magnetic Flux 2040 2048 2056 LSB

Average A/D Reading 100 Gauss, North Pole 3072 LSB

Output Noise Digital Filter Off 5.5

RMS

LSB

SCK pulse period 200 nS

SCK pulse width high or low 80 nS

CS* pulse period 50 µS

CS* falling to first SCK rising 100 nS

Last SCK falling to CS* rising 50 nS

SCK falling to SDO valid 60 nS

Digital output high PWR-0.5 V

Digital output low 0.5 V

Digital input low GND 0.8 V

Digital input high 2 PWR V

Digital input current 1 µA

MX8683 2 03/03/08

Drawing No. 0868309 www.claremicronix.com

MX8683

IXYS

Pin Description

Pin No. Name Description

1 PWR Input Voltage Supply

2 SDO Serial Data Output

3 NC No Connect

4 SCK Serial Clock Input

5 SDI Serial Data Input

6 NC No Connect

7 GND Connect to Ground

8 CS*

Active low chip select for the serial interface. When a logic “high” is on this pin, the

MX8683 is tracking the hall input signal.

Detailed Circuit Description

The hall plate senses the magnetic field that is applied normal (perpendicular) to the package surface.

The signal from the hall plate is offset-corrected by detecting the difference between a pair of analog

samples during the acquisition time. During idle time (CS* high) the MX8683 tracks the first analog

sample. Immediately (~10 nS) after the falling edge of CS* the first sample is held. The track mode for

the second sample starts nominally 4 µS after the falling edge of CS*. Typically 12 µS after the falling

edge of CS* the second sample is held and the resulting analog value is then converted by the A/D. The

result of the A/D conversion is loaded into the I/O register at the next falling edge of CS*, in preparation

for output on SDO.

The internal acquisition and A/D timing is asynchronous to the SCK serial interface clock. The magnetic

field sampling period is controlled externally by the time between consecutive CS* falling edges. For zero

magnetic field input the nominal A/D output is 2048 decimal. North pole towards the top surface of the

MX8683 increases the A/D output count. Applications that require non-continuous one measurement at a

time operation should pulse CS* low twice, reading the data when CS* is low for the second time.

Serial Output (n)

A/D Convert (n+1)Acquisition (n+1)

A/D Convert (n)Acquisition (n)

CS*

SCK

SDO

externally controlled sampling period

13 12 11 10 987654321415 01 13 12 11 10 987654321415 01

MX8683 3 03/03/08

Drawing No. 0868309 www.claremicronix.com

P1-P3 P4-P6 P7-P9 P10-P10

MX8683RTR

Mfr. #:

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Description:

SENSOR HALL EFFECT SPI 8DFN

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MX8683RTR

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