ACS37220 Current Sensor Compact Carrier (top) and Large Carrier (bottom) size comparison.

We are offering these breakout boards with support from Allegro Microsystems as an easy way to use or evaluate their ACS37220 Hall effect-based, electrically isolated current sensors with user-configurable overcurrent fault output. The following list details some of the sensor’s key features:

• Hall effect-based sensor with electrically isolated current path allows the sensor to be inserted anywhere along the current path and to be used in applications that require electrical isolation.
• Extra-low primary current path resistance of 0.1 mΩ in the sensor IC for higher efficiency.
• Differential Hall sensing rejects common-mode fields, so the orientation of the sensor relative to uniform external magnetic fields (e.g. the Earth’s magnetic field) has less effect on the measurement.
• High-bandwidth 150 kHz analog output voltage proportional to AC or DC currents.
• Less than 4 µs response time.
• Output is not ratiometric (i.e. the zero point and sensitivity are independent of the actual supply voltage), which provides immunity from noisy supplies.
• User-configurable overcurrent fault output with 3 µs response time indicates when the current magnitude exceeds the set threshold and can be used for fast short-circuit detection.
• Integrated digital temperature compensation circuitry allows improved accuracy over the full operating temperature range.
• Automotive-grade operating temperature range of -40°C to 150°C.
• Carrier boards, available in compact and large sizes, offer a variety of ways to insert it into the current path along with 0.1″-pitch (breadboard-compatible) power, ground, and output pins.
• The PCB is made with 2-layer (compact versions) or 6-layer (large versions) 2-oz copper, so very little power is lost in the module.
• 3.3V and 5V versions available.

The following table lists the available ACS37220 carrier options:

	Pololu Item #	Part Suffix	Supply Voltage (V)	Current Range	Sensitivity (mV/A)	Zero Point	Size	PCB Details	Price
Large Carrier	#5295	100B3	3.15 to 3.45 (3.3 nominal)	±100 A	13.2	1.65 V	1.4″×1.2″	6 layers, 2-oz copper	$7.95
	#5296	150B3		±150 A	8.8
	#5297	100B5	4.5 to 5.5 (5 nominal)	±100 A	20	2.5 V
	#5298	150B5		±150 A	13.3
	#5299	200B5		±200 A	10
Compact Carrier	#5290	100B3	3.15 to 3.45 (3.3 nominal)	±100 A	13.2	1.65 V	0.7″×0.8″	2 layers, 2-oz copper	$4.95
	#5291	150B3		±150 A	8.8
	#5292	100B5	4.5 to 5.5 (5 nominal)	±100 A	20	2.5 V
	#5293	150B5		±150 A	13.3
	#5294	200B5		±200 A	10

Alternatives available with variations in these parameter(s): current range Select variant…

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