71m6534h-igt Maxim Integrated Products, Inc., 71m6534h-igt Datasheet - Page 93

• Manufacturer Part Number: 71m6534h-igt
• Description: Energy Meter Ic
• Manufacturer: Maxim Integrated Products, Inc.

FDS_6533_6534_004
4.3.7 CE Status and Control
The CE Status Word is useful for generating early warnings to the MPU (Table 50). It contains sag warn-
ings for phase A, B, and C, as well as F0, the derived clock operating at the fundamental input frequency.
The MPU can read the CE status word at every CE_BUSY interrupt. Since the CE_BUSY interrupt oc-
curs at 2520.6 Hz, it is desirable to minimize the computation required in the interrupt handler of the MPU.
CESTATUS provides information about the status of voltage and input AC signal frequency, which are use-
ful 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). The significance of the bits in
CESTATUS is shown in Table 51.
The CE is initialized by the MPU using CECONFIG (Table 52). This register contains in packed form
SAG_CNT, FREQSEL0, FREQSEL1, EXT_PULSE, I0_SHUNT, I1_SHUNT, PULSE_SLOW, and PULSE_FAST.
The CECONFIG bit definitions are given in
The SAG_MASKn bits enable sag detection for the respective phase when set to 1. When SAG_INT is set
to 1, a sag event will generate a transition on the YPULSE output.
v1.1
CESTATUS
CE Address
CE Ad-
0x20
dress
TEMP FIR data
VBAT FIR data
…
Chip ID, Version bytes
…
Last Address
31:29
[bit]
24:0
0x80
28
27
26
25
Name
CECONFIG
Name
Not Used
Not Used
SAG_C
SAG_B
SAG_A
Name
CESTATUS
F0
Name
© 2007-2009 TERIDIAN Semiconductor Corporation
0x3FF
0x0A
0x0B
0x0F
CE
0x5020
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
SAGCNT 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.
Table 51: CESTATUS Bit Definitions
Data
Table 52: CECONFIG Register
Table 50: CESTATUS Register
Description
See description of CESTATUS bits in
Address
0xFFC
0x2C
003C
MPU
0x28
…
…
Table
Description
See description of the CECONFIG bits in
Internal
Internal
Internal
53.
Read
Type
Input
Input
Only
Description
Upper 16 bits are zero. Lower 16 bits are
CHIP_ID[15:8], VERSION[7:0]. This word is
read only.
…
Last Memory Location
Table
71M6533/71M6534 Data Sheet
…
51.
Table
53.
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