Isolated, Digital Output, Power Monitoring IC
with Zero-Crossing Detection, Overcurrent and Overvoltage Flagging
ACS37800
OPERATIONAL BLOCK DIAGRAM
Voltage and
Current
Measurement
Factory Trimmed
RSENSE
Voltage
VLINE
ADC
ΣRISO + RSENSE
vcodes
Channel
Delay
Control
Digital
Filter
Temperature
Compensation
icodes
IP+
Overcurrent
Fault
Comparator
fault out
IP–
Current
ADC
fault
RMS, and Power
Calculation
Voltage Zero
Crossing
Zero
Crossing
Flag
vrms
irms
vcodes
RMS
and
Power
pospf
X
pinstant
icodes
posangle
Calculations
papparent
pactive
pimag
Averaging and
VRMS Flagging
ovrms
uvrms
O/UVRMS
Flag
vrms
0
vrmsavgonesec
vrmsavgonemin
pactiveavgonesec
pactiveavgonemin
irmsavgonesec
irmsavgonemin
1
irms
iavgselen
Averaging
0
1
pactive
pavgselen
Register
Output
Operation
Control
Voltage data
Current data
FAULT data
Power data
Figure 8: Operational Block Diagram
15
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
ALLEGRO [ ALLEGRO MICROSYSTEMS ]
