MX8681RTR IXYS, MX8681RTR Datasheet - Page 3

• Manufacturer Part Number: MX8681RTR
• Description: IC FLUX SENSOR 12BIT DGTL 8-DFN
• Manufacturer: IXYS
• Type: Unipolar Switchr

Specifications of MX8681RTR

• Voltage - Supply: 4.5 V ~ 5.5 V
• Current - Supply: 3mA
• Output Type: Digital, 12-Bit Serial
• Features: High Sensitivity
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-VFDFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Sensing Range: -
• Current - Output (max): -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

MX8681
SCK
Pin Description
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 MX8681 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 32 µS after the falling edge of CS*. Typically 96 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
MX8681 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.
CS*
SDO
MX8681
Drawing No. 0868109
Pin No.
1
2
3
4
5
6
7
8
Acquisition (n)
Name
PWR
SDO
GND
SCK
CS*
SDI
NC
NC
15
14
Description
Input Voltage Supply
Serial Data Output
No Connect
Serial Clock Input
Serial Data Input
No Connect
Connect to Ground
Active low chip select for the serial interface. When a logic “high” is on this pin, the
MX8681 is tracking the hall input signal.
13 12 11 10 9
externally controlled sampling period
8
A/D Convert (n)
7
6
5
4
3
3
2
1
0
Acquisition (n+1)
15
14
13 12 11 10 9
Serial Output (n)
A/D Convert (n+1)
8
7
IXYS
www.claremicronix.com
6
5
4
3
2
03/03/08
1
0