Datasheet

90E32AS ENHANCED POLY-PHASE HIGH-PERFORMANCE WIDE-SPAN ENERGY METERING IC
Function Description 27 April 2, 2013
3.8.4 PARTIAL MEASUREMENT MODE (M MODE)
In this mode, all the measurements are through the same hardware
that does the measurement in the normal mode. To save power, the
energy accumulation block and a portion of the DSP computation code
will not be running in this mode.
In this mode, There are configuration bits in the PMPwrCtrl register to
get lower power if the application allows:
• Option to turn-off the three analog voltage channel if there is no
need to measure voltage and power.
• Option to lower down the digital clock from 16.384Mhz to
8.192MHz
In Partial Measurement mode, CRC checking will be disabled. The
interrupts will not be generated.
Figure-13 Block Diagram in Partial Measurement mode
VDD18 Regulator
Temperature Sensor
Current Detector
ADC-V1
ADC-V2
ADC-V3
ADC-I1
ADC-I2
ADC-I3
SPI Interface
DSP
Energy Metering
(Forward/Reverse
Active/Reactive/CF Generator)
Measure and Monitoring
(V/I/rms / SAG / Phase /
Frequency)
Control Logic
Zero
Crossing
CF Out
Power On Reset
Crystal Oscillator
On-chip
Reference Voltage
Vref
I1P / I1N
V1P / V1N
CS
SCLK
SDO
SDI
OSCI OSCO
RESET
CF1
ZX0
I2P / I2N
I3P / I3N
V2P / V2N
V3P / V3N
CF2
CF3
CF4
ZX1
ZX2
Power Mode
Configuration
PM1
PM0
IRQ
WarnOut
IRQ0
IRQ1
Warn
Out
Flexible Piece-wise Non-linear
Compensation
Disabled