MX8682RTR IXYS, MX8682RTR Datasheet - Page 7

• Manufacturer Part Number: MX8682RTR
• Description: IC FLUX SENSOR 12BIT DGTL 8-DFN
• Manufacturer: IXYS
• Type: Unipolar Switchr

Specifications of MX8682RTR

• 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: Compliant

MX8682
Application Example
This application example illustrates one method of incorporating the MX8682 into a power circuit board
design. The double-sided 8oz copper traces carry 10A (5A on the top trace and 5A on the bottom trace)
around the center section of the planar E-core. The MX8682 is mounted on a small single layer flex
circuit that effectively adds a third layer. The flex also fans out the fine pitch DFN package to a pitch
compatible with the power board. The magnetic circuit consists of two ferrite E14 planar cores. The
center post of one of the cores is gapped to accommodate the MX8682 package thickness plus the flex
circuit thickness. For the 10A full scale application a gap of 47 to 52 mils is appropriate (1.2 to 1.32 mm).
The gain trim range of the MX8682 can accommodate even larger gaps if required.
This following example illustrates the MX8682 mounted directly on a 1oz PCB with a copper strap
positioned around the Hall element to carry the current being measured.
Design alternatives:
The use of an E-I core pair results in a lower profile than E-E however a thinner board must be used. A
thinner sensor can be obtained by FCOF (flip chip on flex) packaging of the MX8682 bumped die. The
maximum mounting height of the DFN package is 1.1 mm whereas the chip height is about 0.4 mm.
MX8682
Drawing No. 0868209
PCB top layer: (scale 1X)
Flex circuit
Cross Section (drawing not to scale)
PCB bottom layer: (top view, 1X)
Copper stamping, thickness as required
MX8682
MX8682
7
(2) E14 planar cores
Flex circuit: (component side, 1X)
IXYS
www.claremicronix.com
03/03/08