ACTUATOR CHIP FOR INKJET PRINTHEAD WITH TEMPERATURE SENSE RESISTORS HAVING CURRENT, SINGLE-POINT OUTPUT

摘要

An inkjet printhead includes an actuator chip for delivering ink from the printhead. The actuator chip has a plurality of bond pads for electrically connecting to a controller of an external device. A plurality of temperature sense resistors (TSRs) of the actuator chip each has an output provided as a current proportional to temperature of nearby vicinities and such connect to only a single one of the bond pads. On-chip circuitry also scales the outputs on the actuator chip which avoid scaling at the controller of the external device. Representative arrangements of the TSRs include transistor drivers in or out of feedback loop circuits. Attendant circuitry representatively includes switching logic, current mirrors, and amplifiers. Functionality of the circuitry includes actuator chip temperature averaging, actuator chip temperature zones, current scaling and gain, and point source TSRs. InkJet printers and other external devices are also disclosed.