Title :
Current sensor IC provides 9 bit+sign result without external sense resister
Author :
Kotowski, Jeff ; McIntyre, Bill ; Parry, John
Author_Institution :
Nat. Semicond. Corp., Grass Valley, CA, USA
Abstract :
This paper describes a mixed signal integrated circuit for current measurement. Fabricated on a 1 μm CMOS process, the IC employs a delta sigma analog to digital converter to generate a pulse-width modulated (PWM) output proportional to current. A metal loop stamped into the lead frame acts as a current sense resistor, providing a 5 mV full scale signal at 1 amp sense current. The IC measures the sense voltage, corrects for the temperature coefficient in the metal loop, and creates a 9 bit accurate PWM output. This circuit consumes less than 120 μA in operating mode and less than 3 μA in sleep mode
Keywords :
CMOS integrated circuits; analogue-digital conversion; electric current measurement; electric sensing devices; mixed analogue-digital integrated circuits; pulse width modulation; 1 A; 1 micron; 3 to 120 muA; CMOS process; PWM output; current measurement; current sensor; delta sigma analog to digital converter; mixed signal integrated circuit; operating mode; sense voltage; sleep mode; temperature coefficient; Analog integrated circuits; Analog-digital conversion; CMOS analog integrated circuits; CMOS digital integrated circuits; CMOS integrated circuits; CMOS process; Current measurement; Mixed analog digital integrated circuits; Pulse width modulation; Pulse width modulation converters;
Conference_Titel :
Custom Integrated Circuits Conference, 1998. Proceedings of the IEEE 1998
Conference_Location :
Santa Clara, CA
Print_ISBN :
0-7803-4292-5
DOI :
10.1109/CICC.1998.694902
