90E32 Datasheet, PDF (49/71 Pages) Integrated Device Technology – Poly-Phase High-Performance Wide-Span Energy Metering IC

90E32
POLY-PHASE HIGH-PERFORMANCE WIDE-SPAN ENERGY METERING IC
6.4 CONFIGURATION AND CALIBRATION REGISTERS
6.4.1 START REGISTERS AND ASSOCIATED CHECKSUM OPERATION SCHEME
The Start Registers (ConfigStart (30H), CalStart (40H), HarmStart (50H) and AdjStart (60H)) and associated registers / checksum have a special
operation scheme to protect important configuration data, illustrated below in the diagram. Start registers have multiple valid settings for different
operation modes.
Start Register Value
6886H
5678H
8765H
Other
Usage
Power up state
Calibration
Operation
Error
Operation
It is the value after reset. This state blocks checksum checking error generation
Similar like 6886H, This state blocks checksum checking error generation. Writing with this value trigger a reset
to the associated registers.
Checksum checking is enabled and if error detected, IRQ/Warn is asserted and Metering stopped.
Force checksum error generation and system stop.
6.4.2
xxxStart register
xxxStart = 5678H
01
Metering
Enable
Start Associated
Regisers
User Read
User Write
CheckSum
(computed)
CheckSum
(programmed)
1
Checksum
Computation
Compare Error?
0
0
1
Error
Checksum
Error
0
0
1
IRQ/WarnOut
Generation
xxxStart =
8765H
xxxStart =
6886H
 xxxStart refers to ConfigStart, CalStart, HarmStart and
AdjStart. Those registers and their assoicated checksum
computation has similar behavior.
 xxxStart registers’ reset value is 6886H.
 Writing 5678H to xxxStart register will trigger a reset to its
associated register. Register can be accessed after reset.
 xxxStart associated register is the register between
xxxStart and associated checksum
Figure-16 Start and Checksum Register Operation Scheme
CONFIGURATION REGISTERS
Table-5 Configuration Registers
Register
Address
Register Name
30H
ConfigStart
31H
PLconstH
32H
PLconstL
33H
MMode0
34H
MMode1
35H
PStartTh
36H
QStartTh
37H
SStartTh
Read/Write
Type
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Functional Description
Power-on Value and Comments
Configuration Registers^*
Calibration Start Command
6886H
High Word of PL_Constant
0861H
Low Word of PL_Constant
C468H
HPF/Integrator On/off, CF
computation configuration
and
all-phase
energy
0087H
PGA gain configuration
0000H
Active Startup Power Threshold.
16 bit unsigned integer, Unit: 0.00032 Watt
0000H.
Reactive Startup Power Threshold.
16 bit unsigned integer, Unit: 0.00032 var
0000H
Apparent Startup Power Threshold.
16 bit unsigned integer, Unit: 0.00032 VA
0000H
Register
49
December 9, 2011