Datasheet

so very little power is lost in the board.
• Use of a Hall effect sensor means the IC is able to electrically isolate the current path from the
sensor’s electronics (up to 2.1 kV RMS), which allows the sensor to be inserted anywhere along
the current path and to be used in applications that require electrical isolation.
• 80 kHz bandwith that can optionally be decreased by adding a capacitor across the board pins
marked “filter”.
• High accuracy and reliability: typical total output error of ±1.5% at room temperature with
factory calibration, an extremely stable output offset voltage, and almost zero magnetic
hysteresis.
• Automotive-grade operating temperature range of -40°C to 150°C.
The pads are labeled on the bottom silkscreen, as shown in the picture to the right. The silkscreen also
shows the direction that is interpreted as positive current flow via the +i arrow.
Like almost all our carrier boards, this sensor ships assembled with all of its required surface mount
components, as shown in the main product picture.
We sell a 30A unidirectional version and ±30A bidirectional version version of this board; you can
distinguish these versions by reading the text on the IC or by looking at the color of the X on the
bottom silkscreen. This version is marked with a blue X.
Using the sensor
Electrical connections
The sensor requires a supply voltage of 4.5 – 5.5 V to be connected across the Vcc and GND pads,
which are labeled on the bottom silkscreen. The sensor outputs an analog voltage that is linearly
proportional to the input current. When Vcc is 5 V, this output voltage is centered at 2.5 V and changes
by 185 mV per amp of input current, with positive current increasing the output voltage and negative
current decreasing the output voltage.
The input current can be connected to the board in a variety of ways. For low-current applications, you
can solder 0.1" male header pins to the board via the small through-holes on the input-current side of
the board. For higher-current applications, you can solder wires directly to the through-holes whose
sizes best match your wires, or you can use solderless ring terminal connectors, as shown in the picture
to the right. The large through-holes are big enough for #6 screws.