A programmable temperature monitoring device for tagging small fish: a prototype chip development

Abstract

This paper describes the design of an archival temperature monitoring tag to be used to collect habitat information of Atlantic salmon during the marine phase of the species' natural history. The monolithic circuit should not exceed an average power dissipation of 3.4W, so that a small 3 V, 30 mAh lithium battery will provide the device with the expected lifetime of 3 years. The thermal sensor is realized by a p-njunction. The recorded junction voltages are digitized and stored in static RAM cells. The tag is programmed before deployment by an external computer via a serial interface. The device's temperature-monitoring protocol is defined at this stage. Upon retrieval of the tag, the stored temperature values will be transfered to a computer where the geographical location of the fish at the actual sampling time will be deduced through retrospective navigation based on known sea temperature distribution.

High Sensitive and Wide Detecting Range MOS Tunneling Temperature Sensors for On-Chip Temperature Detection

“…Differentiating the equation as proposed above can obtain the following: (7) Rearranging (7) leads to (8) Lower substrate temperature ( ) causes lower gate current ( ). The above equation reveals that larger substrate temperature deviation (…”

“…Using an on-chip temperature sensor is known to further enhance precision and accuracy. For example, a transistor [3]- [6] or a p-n junction diode [7]- [9] is preferred, owing to its easy fabrication and well-known physics. However, the conventional temperature sensors generally have a lower temperature sensitivity.…”