CS5464-ISZR Cirrus Logic Inc, CS5464-ISZR Datasheet - Page 21

• Manufacturer Part Number: CS5464-ISZR
• Description: IC 3-Channel Single Phase Power/Energy
• Manufacturer: Cirrus Logic Inc
• Type: Single Phase Power/Energy ICr

Specifications of CS5464-ISZR

• Input Impedance: 30 KOhm
• Measurement Error: 0.1%
• Voltage - I/o High: 0.8V
• Voltage - I/o Low: 0.2V
• Current - Supply: 3.5mA
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-SSOP
• Meter Type: Single Phase
• Output Voltage Range: 2.4 V to 2.6 V
• Output Current: 100 mA
• Input Voltage Range: 3.135 V to 5.25 V
• Input Current: 10 mA
• Power Dissipation: 500 mW
• Operating Temperature Range: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 598-1554 - BOARD EVAL FOR CS5464 ADC
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

For each enabled input channel, the measured value is
rectified and compared to the associated level register .
Over the duration window, the number of samples
above and below the level are counted. If the number of
samples below the level exceeds the number of sam-
ples above, a Status register bit V1
I1
tion. (see
6.12 Epsilon
The Epsilon register is used to set the gain of the 90°
phase shift used in the quadrature power calculation.
The value in the Epsilon register is the ratio of the line
frequency to the output word rate (OWR). It is, by de-
fault, 50/4000 (0.0125), for 50 Hz line and 4000 Hz
sample (OWR) frequencies.
For 60 Hz line frequency, it is 60/4000 (0.015). Other
output word rates (OWR) can be used.
Epsilon can also be calculated automatically by the
CS5464 by setting the AFC bit in the Mode Control
( Modes ) register. The Frequency Update bit (FUP) in
the Status register is set every time the Epsilon register
has been automatically updated.
6.13 Temperature Measurement
The on-chip temperature sensor is designed to mea-
sure temperature and optionally compensate for tem-
perature drift of the voltage reference. It uses the V
a transistor to determine temperature.
Temperature measurements are stored in the Temper-
ature register ( T ) which, by default, is configured to a
range of ±128 degrees on the Celsius (°C) scale.
DS682F1
FAULT
(I2
Figure
FAULT
Figure 7. Sag and Fault Detect
) is set, indicating a sag or fault condi-
7)..
SAG
(V2
SAG
BE
of
),
The application program can change both the scale and
range of Temperature ( T ) by changing the Temperature
Gain ( T
Two values must be known — the transistor’s
degree, and the transistor’s V
time of this publication, these values are:
V
To determine the values to write to T
the following formulae:
T
T
In the above equations, AD
range of the temperature A/D converter or 833.333 mV
and T
ture register. The binary exponents are the bit positions
of the binary point of these registers.
To use the Celsius scale (°C) and cover the chip’s op-
erating temperature range of -40°C to +85°C, the Tem-
perature register range needs to be ±128 degrees. T
should be 128 degrees.
T
T
These are the actual default values for these registers.
T
and/or offset of the temperature sensor or A/D convert-
er. (See
To use the Kelvin (°K) scale, simply add 273 times
∆
also need more range. Since -40°C to +85°C is 233°K
to 358°K, a T
T
To use the Fahrenheit (°F) scale, multiply
and add 32 times the new
since 0°C = 32°F. You will also want to use a T
degrees to cover the -40°C to +85°C range.
The Temperature register ( T ) updates every 2240 out-
put word rate (OWR) samples. The Status register bit
TUP indicates when T is updated.
∆
GAIN
OFF
GAIN
OFF
GAIN
GAIN
BE
V
V
BE
BE
0 = 79.2604368 mV at 0°C
= -V
FS
/ AD
= AD
= 833.333 / 0.2769523 / 128 x 131072
= 3081155 (0x2F03C3)
= -79.2604368 / 833.333 x 8388608
= -797862 (0xF3D35A)
calculation.
and T
(per degree) = 0.2769523 mV/°C or °K
GAIN
is the desired full-scale range of the Tempera-
Section 9. System Calibration
BE
FS
FS
) and Temperature Offset ( T
0 / AD
OFF
x 2
FS
/
∆
23
of 512 degrees should be used in the
can also be used to calibrate the gain
V
FS
BE
to T
x 2
/ T
OFF
FS
23
since 0°C = 273°K,. You will
∆
x 2
V
FS
17
BE
BE
is the full-scale input
/ AD
at 0 degrees. At the
GAIN
FS
on page 39).
OFF
and T
x 2
CS5464
∆
) registers.
V
23
∆
BE
FS
OFF
V
to T
BE
by 5/9
of 256
, use
OFF
per
FS
21