71M6513-IGTR/F Maxim Integrated Products, 71M6513-IGTR/F Datasheet - Page 69

• Manufacturer Part Number: 71M6513-IGTR/F
• Description: IC ENERGY METER 3PH 100-LQFP
• Manufacturer: Maxim Integrated Products

Specifications of 71M6513-IGTR/F

• Mounting Style: SMD/SMT
• Package / Case: LQFP-100
• Program Memory Size: 64 KB
• Program Memory Type: Flash
• Supply Current (max): 6.4 mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

CE Front End Data (Raw Data)
Access to the raw data provided by the AFE is possible by reading addresses 0 through 7, as listed below.
CE Status Word
Since the CE_BUSY interrupt occurs at 2520.6Hz, it is desirable to minimize the computation required in the interrupt handler
of the MPU. The CE status word can be read by the MPU at every CE_BUSY interrupt.
The CE Status Word is useful for generating early warnings to the MPU. It contains sag warnings for phase A, B, and C, as
well as F0, the derived clock operating at the fundamental input frequency. CESTATUS provides information about the status of
voltage and input AC signal frequency, which are useful for generating an early power fail warning to initiate necessary data
storage. CESTATUS represents the status flags for the preceding CE code pass (CE_BUSY interrupt).
Note: The CE does not store sag alarms from one code pass to the next. CESTATUS is refreshed at every CE_BUSY
interrupt and remains valid for up to 100µs after the CE_BUSY interrupt occurs. Unsynchronized read operations of
CESTATUS will yield unreliable results.
The significance of the bits in CESTATUS is shown in the table below:
CESTATUS Bit
For generating proper status information, the CE is initialized by the MPU using SAG_THR (default of 80V RMS at the meter
input if VMAX=600V) and SAG_CNT (default 80 samples). Using the default value for SAG_CNT, the peak-to-peak signal has to
be below SAG_THR value for 32 milliseconds to activate the SAG_X status bits.
Address
31-29
24-0
0x51
CE
28
27
26
25
A Maxim Integrated Products Brand
Name
Not Used
Not Used
CESTATUS
SAG_C
SAG_B
SAG_A
Name
F0
Description
These unused bits will always be zero.
F0 is a square wave at the exact fundamental input frequency.
Normally zero. Becomes one when |VC| remains below SAG_THR for SAG_CNT
samples. Will not return to zero until |VC| rises above SAG_THR.
Normally zero. Becomes one when |VB| remains below SAG_THR for SAG_CNT
samples. Will not return to zero until |VB| rises above SAG_THR.
Normally zero. Becomes one when |VA| remains below SAG_THR for SAG_CNT
samples. Will not return to zero until |VA} rises above SAG_THR.
These unused bits will always be zero.
Address (HEX)
Description
See description of CE status word below
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
© 2005-2011 Teridian Semiconductor Corporation
Name
TEMP
VA
VB
VC
V3
IA
IB
IC
Description
Phase A current
Phase A voltage
Phase B current
Phase B voltage
Phase C current
Phase C voltage
Temperature
V3 monitor/comparator
input
3-Phase Energy Meter IC
71M6513/71M6513H
DATA SHEET
SEPTEMBER 2011
Page: 69 of 104