  We demonstrate a tuneable, chip-scale wavelength reference to greatly reduce
the complexity and volume of cold-atom sensors. A 1 mm optical path length
micro-fabricated cell provides an atomic wavelength reference, with dynamic
frequency control enabled by Zeeman shifting the atomic transition through the
magnetic field generated by the printed circuit board (PCB) coils. The dynamic
range of the laser frequency stabilization system is evaluated and used in
conjunction with an improved generation of chip-scale cold atom platforms that
traps 4 million 87Rb atoms. The scalability and component consolidation provide
a key step forward in the miniaturization of cold atom sensors.
