71M6545 MAXIM [Maxim Integrated Products], 71M6545 Datasheet - Page 101

• Manufacturer Part Number: 71M6545
• Description: Four-Quadrant Metering, Phase Metrology Processors Flash/RAM Size
• Manufacturer: MAXIM [Maxim Integrated Products]

environment for the CE by implementing the following steps:
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•
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When different CE codes are used, a different set of environment parameters need to be established.
The exact values for these parameters are listed in the Application Notes and other documentation which
accompanies the CE code.
Typically, there are fifteen 32768 Hz cycles per ADC multiplexer frame (see 2.2.2). This means that the
product of the number of cycles per frame and the number of conversions per frame must be 14 (allowing
for one settling cycle). The default configuration is FIR_LEN = 01, I/O RAM 0x210C[1] (two cycles per
conversion) and MUX_DIV[3:0] = 7 (7 conversions per multiplexer cycle).
Sample configurations can be copied from Demo Code provided by Teridian with the Demo Kits.
PDS_6545_009
5.4.4 Environment
Before starting the CE using the CE_E bit (I/O RAM 0x2106[0]), the MPU has to establish the proper
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5.4.5 CE Calculations
Referring to
0x2106[7:5]).
v1.0
Note:
* Only EQU[2:0] = 5 is supported by the currently available CE code versions for the 71M6545/H.
Contact your local Teridian representative for CE codes that support equations 2, 3 and 4.
[2:0]*
EQU
2
3
4
5
Locate the CE code in Flash memory using CE_LCTN[5:0] (I/O RAM 0x2109[5:0])
Load the CE data into RAM.
Establish the equation to be applied in EQU[2:0] (I/O RAM 0x2106[7:5]).
Establish the accumulation period and number of samples in SUM_SAMPS[12:0] (I/O RAM
0x2107[4:0], 0x2108[7:0]).
Establish the number of cycles per ADC multiplexer frame (MUX_DIV[3:0] (I/O RAM 0x2100[7:4])).
Apply proper values to MUXn_SEL, as well as proper selections for DIFFn_E (I/O RAM 0x210C[ ]) and
RMTn_E (I/O RAM 0x2709[ ] in order to configure the analog inputs.
Initialize any MPU interrupts, such as CE_BUSY, XFER_BUSY, or the power-failure detection interrupt.
VA*IA + VB*IB
(2-element, 3-W, 3 φ
Delta)
VA*(IA-IB)/2 + VC*IC
(2 element, 4W 3φ Delta)
VA*(IA-IB)/2 + VB*(IC-IB)/2
(2 element, 4W 3φ Wye)
VA*IA + VB*IB + VC*IC
(3 element, 4W 3φ Wye)
Operating CE codes with environment parameters deviating from the values specified by Teridian
leads to unpredictable results.
Watt & VAR Formula
(WSUM/VARSUM)
Table
63, The MPU selects the desired equation by writing the EQU[2:0] (I/O RAM
Table 63: CE EQU[2:0] Equations and Element Input Mapping
© 2008–2011 Teridian Semiconductor Corporation
VA*(IA-IB)/2
VA*(IA-IB)/2 VB*(IC-IB)/2
VAR0SUM
W0SUM/
VA * IA
VA*IA
VAR1SUM
W1SUM/
VB * IB
VB*IB
–
VAR2SUM
W2SUM/
VC*IC
VC*IC
N/A
–
IA-IB
IA-IB
I0SQ
SUM
IA
IA
Data Sheet 71M6545/H
IC-IB
I1SQ
SUM
IB
IB
IB
I2SQ
SUM
IC
IC
IC
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101