Document
ACS37800
Isolated, Digital Output, Power Monitoring IC with Zero-Crossing Detection, Overcurrent and Overvoltage Flagging
FEATURES AND BENEFITS
• Accurate power monitoring for AC and DC applications • UL 60950-1 (ed. 2) and UL 62368-1 (ed. 1) certified for
reinforced isolation up to 517 VRMS in a single package • Accurate measurements of active, reactive, and apparent
power, as well as power factor • Separate RMS and instantaneous measurements for both
voltage and current channels • Two programmable averaging blocks • 0.85 mΩ primary conductor resistance for low power loss
and high inrush current withstand capability • Compatible with floating and non-floating GND • Dedicated voltage or current zero crossing pin • Fast, user-programmable overcurrent fault pin (5 µs typ.) • User-programmable undervoltage and overvoltage RMS
thresholds • 1 kHz bandwidth • Current sensing range up to 90 A • Options for I2C or SPI digital interface protocols
PACKAGE
16-pin SOICW (suffix MA)
Not to scale
DESCRIPTION
The Allegro ACS37800 power monitoring IC greatly simplifies the addition of power monitoring to many AC or DC powered systems. The sensor may be powered from the same supply as the system’s MCU, eliminating the need for multiple power supplies. The device’s construction includes a copper conduction path that generates a magnetic field proportional to applied current. The magnetic field is sensed differentially to reject errors introduced by common mode fields.
Allegro’s Hall-effect-based, galvanically isolated current sensing technology achieves reinforced isolation ratings (4800 VRMS) in a small PCB footprint. These features enable isolated current sensing without expensive Rogowski coils, oversized current transformers, isolated operational amplifiers, or the power loss of shunt resistors.
The ACS37800 power monitoring IC offers key power measurement parameters that can easily be accessed through its SPI or I2C digital protocol interfaces. Dedicated and configurable I/O pins for voltage/current zero crossing, undervoltage and overvoltage reporting, and fast overcurrent fault detection are available in I2C mode. User configuration of the IC is available through on-chip EEPROM.
The ACS37800 is provided in a small low-profile surface mount SOIC16 wide-body package, is lead (Pb) free, and is fully calibrated prior to shipment from the Allegro factory. Customer calibration can further increase accuracy in application.
CB Certificate Number: US-32210-M1-UL US-36315-UL
L (N)
N (L)
1 MΩ
REINFORCED ISOLATION
1 MΩ
1 MΩ 1 MΩ
RSENSE
1
16
IP+ ACS37800 VINP
2
IP+
15
VINN
3
IP+
14
GND
4
IP+
13
VCC
IP
5
12
IP-
SDA / MISO
6
IP-
11
SCL / SCLK
7
IP-
10
DIO_0 / MOSI
8
IP-
9
DIO_1 / CS
I2C Only
RPULLUP
MCU
GND
VCC
RPULLUP
Single Output Isolated Power
Supply (Flyback, etc.)
Linear Regulator
To User
ACS37800-DS, Rev. 3 MCO-0001004
Figure 1: Typical Application
March 17, 2022
ACS37800
Isolated, Digital Output, Power Monitoring IC with Zero-Crossing Detection, Overcurrent and Overvoltage Flagging
SELECTION GUIDE
Part Number
ACS37800KMACTR-015B5-SPI ACS37800KMACTR-030B3-SPI ACS37800KMACTR-030B3-I2C ACS37800KMACTR-090B3-I2C
VCC(typ) (V)
5 3.3 3.3 3.3
[1] Contact Allegro for additional packing options.
IPR (A)
±15 ±30 ±30 ±90
Communication Protocol SPI
I2C
TA (°C) –40 to 125
Packing [1]
Tape and reel, 1000 pieces per reel, 3000 pieces per box
ACS 37800 K MAC TR - 015 B 5 - SPI
Communication Protocol Supply Voltage:
5 – VCC = 5 V 3 – VCC = 3.3 V
Output Directionality: B – Bidirectional
Current Sensing Range (A)
Packing Designator Package Designator
Operating Temperature Range
5 Digit Part Number
Allegro Current Sensor
2
Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com
ACS37800
Isolated, Digital Output, Power Monitoring IC with Zero-Crossing Detection, Overcurrent and Overvoltage Flagging
ABSOLUTE MAXIMUM RATINGS
Characteristic Supply Voltage Reverse Supply Voltage Input Voltage Reverse Input Voltage Digital I/O Voltage Reverse Digital I/O Voltage Maximum Continuous Current Operating Ambient Temperature Junction Temperature
Storage Temperature
Symbol VCC VRCC
VINP, VINN VRNP, VRNN
VDIO VRDIO ICMAX
TA TJ(max)
Tstg
Notes
SPI, I2C, and general purpose I/O TA = 25°C Range K
Rating 6.5 –0.5
VCC + 0.5 –0.5 6 –0.5 60
–40 to 125 165
–65 to 170
Units V V V V V V A °C °C
°C
ISOLATION CHARACTERISTICS
Characteristic
Symbol
Dielectric Strength Test Voltage
VISO
Notes
Agency type-tested for 60 seconds per UL 60950-1 (edition 2) and UL 62368-1 (edition 1); Production tested at 3000 VRMS for 1 second, in accordance with UL 60950-1 (edition 2) and UL 62368-1 (edition 1)
Working Voltage for Basic Isolation
VWVBI
Maximum approved working voltage for basic (single) isolation according to UL 60950-1 (edition 2) and UL 62368-1 (edition 1)
Rating 4800
1480 1047
Working Voltage for Reinfo.