CUR 3105 DATA SHEET
4Oct. 12, 2009; DSH000155_001EN Micronas
Hall-Effect Current Transducer
1. Introduction
The CUR 3105 is a new current transducer based on
the Hall effect. The IC can be used for very precise
current measurements. The measured current is pro-
portional to the analog output voltage driven by the
sensors output. Major characteristics like magnetic
field range, sensitivity, output quiescent voltage (output
voltage at B = 0 mT), and output voltage range are
programmable in a non-volatile memory. The trans-
ducer has a ratiometric output characteristic, which
means that the output voltage is proportional to the
current and the supply voltage. It is possible to pro-
gram different transducers which are in parallel to the
same supply voltage individually.
The CUR 3105 features a temperature-compensated
Hall plate with choppered offset compensation, an
A/D converter, digital signal processing, a D/A con-
verter with output driver, an EEPROM memory with
redundancy and lock function for the calibration data,
an EEPROM for customer serial number, a serial inter-
face for programming the EEPROM, and protection
devices at all pins. The internal digital signal process-
ing is of great benefit because analog offsets, temper-
ature shifts, and mechanical stress do not degrade the
transducers accuracy.
The CUR 3105 is programmable by modulating the
supply voltage. No additional programming pin is
needed. The easy programmability allows a 2-point
calibration by adjusting the output voltage directly to
the input signal (current). Individual adjustment of each
transducer during the customer’s manufacturing pro-
cess is possible. With this calibration procedure, the
tolerances of the IC and the mechanical positioning
can be compensated in the final assembly. This offers
a low-cost alternative for all applications that presently
need mechanical adjustment or laser trimming for cali-
brating the system.
The calculation of the individual IC characteristics and
the programming of the EEPROM memory can easily
be done with a PC and the application kit from Micro-
nas.
The transducer is designed for industrial, white
goods and automotive applications and operates
with typically 5 V supply voltage in the wide junction
temperature range from −40 °C up to 170 °C. The
CUR 3105 is available in the very small leaded pack-
ages TO92UT-1 and TO92UT-2.
1.1. Features
– high-precision current transducer with ratiometric
output and digital signal processing
– low output voltage drifts over temperature
– 12-bit analog output
– multiple programmable magnetic characteristics in a
non-volatile memory (EEPROM) with redundancy
and lock function
– open-circuit (ground and supply line break detec-
tion) with 5 kΩ pull-up and pull-down resistor, over-
voltage and undervoltage detection
– for programming an individual transducer within
several ICs in parallel to the same supply voltage, a
selection can be done via the output pin
– programmable clamping function
– programming through modulation of the supply volt-
age
– operates from −40 °C up to 170 °C junction temper-
ature
– operates from 4.5 V up to 5.5 V supply voltage in
specification and functions up to 8.5 V
– operates with static magnetic fields and dynamic
magnetic fields up to 1 kHz
– overvoltage and reverse-voltage protection at all
pins
– magnetic characteristics extremely robust against
mechanical stress
– short-circuit protected push-pull output
– EMC and ESD optimized design