Abstract
A very compact and rugged 2.5-D integrated data
logger has been built and tested. The data logger is capable
of measuring accelerations exceeding 70 000 g. Microcontroller
and flash memory as bare dies have been mounted onto a
silicon interposer with through silicon vias using anisotropic
conductive film and Au stud bump bonding. A microelectromechanical
system accelerometer is mounted onto the interposer,
using a robust customized flip-chip mounting approach. The
interposer is mounted into a 16-pin leadless chip carrier package
using isotropic conductive adhesive, where the conductive
part is made of metallized polymer spheres. The ceramic
package was mounted onto an application printed circuit
board (PCB) with filters, power management, and an interface
contact, using soldered plastic core solder balls (PCSBs).
The diameter of the data logger is less than 9 mm, and the
height is approximately 5 mm. The data logger fits within
12.7-mm (0.50 cal.) projectile, and acceleration measurements
have been performed during firing, flight, and recovery. The
measured accelerations have been verified by comparing the
calculated projectile muzzle velocities with Doppler radar
measurements.
logger has been built and tested. The data logger is capable
of measuring accelerations exceeding 70 000 g. Microcontroller
and flash memory as bare dies have been mounted onto a
silicon interposer with through silicon vias using anisotropic
conductive film and Au stud bump bonding. A microelectromechanical
system accelerometer is mounted onto the interposer,
using a robust customized flip-chip mounting approach. The
interposer is mounted into a 16-pin leadless chip carrier package
using isotropic conductive adhesive, where the conductive
part is made of metallized polymer spheres. The ceramic
package was mounted onto an application printed circuit
board (PCB) with filters, power management, and an interface
contact, using soldered plastic core solder balls (PCSBs).
The diameter of the data logger is less than 9 mm, and the
height is approximately 5 mm. The data logger fits within
12.7-mm (0.50 cal.) projectile, and acceleration measurements
have been performed during firing, flight, and recovery. The
measured accelerations have been verified by comparing the
calculated projectile muzzle velocities with Doppler radar
measurements.