CS5462 Ver la hoja de datos (PDF) - Cirrus Logic
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CS5462 Datasheet PDF : 18 Pages
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CS5462
IIN± PGA
PGA Gain Select
HPF Select
4th Order
∆Σ
Modulator
Digital
Filters
HPF
On-Chip
Configuration
Output Mode Select
Freq Select
Calibration
x
x
Energy to
Pulse Rate
Converter
E1
E2
FOUT
VIN± 10x
2nd Order
∆Σ
Modulator
Digital
Filters
HPF
Figure 1. Data Flow
3.1 Theory of Operation
A computational flow diagram for the two data
paths is shown in Figure 1. The analog waveforms
at the voltage/current channel inputs are subject to
the gains of the input PGAs.
3.1.1 Digital Filters
erage power. This power is then adjusted based on
the internal calibration setting defined at startup.
Calibrating the CS5462 is done by externally con-
necting the configuration input pins, CAL1 and
CAL0, to the program select output pins, P1 - P7,
in a particular sequence. These connections will in-
ternally compensate for small gain errors.
The modulators convert the analog input voltages
on the I and V channels to a digital bitstream; which
is then filtered by the digital filter section. The digi-
tal filter is composed of low pass sinc 3 and IIR fil-
ters. The IIR filters are used to compensate for the
magnitude roll-off of the low pass filter section.
Both channels provide a high-pass filter option
which can be engaged into the signal path to re-
move the DC content from the current/voltage signal
before the energy calculations are made.
3.1.2 Gain Calibration
After being filtered, the instantaneous voltage and
current digital codes are used to calculate real av-
3.1.3 Energy-to-Frequency Conversion
The calibrated energy value is then converted into
a pulse output stream with a average frequency
proportional to the measured energy. Pulse output
pins E1 and E2 can be set to lower frequencies to
directly drive a stepper motor or a mechanical
counter or interface a microcontroller or infrared
LED. The FOUT pulse output pin is set to max fre-
quency of 10 kHz. With full scale inputs on both the
current and voltage channels FOUT will output
pulses with an average frequency of 10 kHz.
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