Isolated, Digital Output, Power Monitoring IC
with Zero-Crossing Detection, Overcurrent and Overvoltage Flagging
ACS37800
Register 0x22
Bits
15:0
26:16
27
Name
papparent
pfactor
Description
Apparent power magnitude
Power factor
posangle
pospf
Sign of the power angle
Sign of the power factor
28
papparent
posangle
Apparent power output magnitude. This field is an unsigned
Bit to represent leading or lagging. A 0 represents the current
16-bit fixed point number with 16 fractional bits, where MaxPow leading and a 1 represents the current lagging.
= 0.704. To convert the value (input power) to line power, divide
pospf
the input power by the RSENSE and RISO voltage divider ratio
using actual resistor values.
Sign bit to represent if the power is being generated (0) or con-
sumed (1).
Table 22: papparent
Register
Range
Valid Range
Value
Units
0 to ~1
0 to ~0.704
[0 to ~1] × MaxPow × 1.42 mVAR
pfactor
Power factor output. This field is a signed 11-bit fixed point num-
ber with 10 fractional bits. It ranges from –1 to ~1 with a step
size of 2-10. pfactor is further described in Table 23.
Table 23: pfactor
Range
Value
Units
–1 to ~1
–1 to ~1
–
Register 0x25
Bits
Name
numptsout
Description
9:0
Number of samples of current and voltage used for calculations
numptsout
Number of points used in the rms calculation. This will be the
dynamic value that is evaluated internal to the device based on
full cycle zero crossings of the voltage channel. numptsout is
further described in Table 24.
Table 24: numptsout
Range
Value
Units
0 to 1023
0 to 1023
samples
34
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
ALLEGRO [ ALLEGRO MICROSYSTEMS ]
