71M6521DH MAXIM [Maxim Integrated Products], 71M6521DH Datasheet - Page 81

• Manufacturer Part Number: 71M6521DH
• Description: Energy Meter ICs
• Manufacturer: MAXIM [Maxim Integrated Products]

71M6521DE/DH/FE Data Sheet
VERSION[7:0]
VREF_CAL
VREF_DIS
WAKE_ARM
WAKE_PRD
WAKE_RES
WD_RST
WD_OVF
WE
Rev 2
SFRE8[7]
20A9[2:0]
201F7:0]
20A9[7]
20A9[3]
2004[7]
2004[3]
2002[2]
2006
001
--
--
0
0
0
0
0
0
--
--
--
--
--
0
1
0
0
R/W
R/W
R/W
R/W
R/W
W
W
W
R
The version index. This word may be read by firmware to determine
the silicon version.
Brings VREF to VREF pad. This feature is disabled when
VREF_DIS=1.
Disables the internal voltage reference.
Arm the autowake timer. Writing a 1 to this bit arms the autowake
timer and presets it with the values presently in WAKE_PRD and
WAKE_RES. The autowake timer is reset and disarmed whenever
the MPU is in MISSION mode or BROWNOUT mode. The timer
must be armed at least three RTC cycles before the SLEEP or LCD-
ONLY mode is commanded.
Sleep time. Time=WAKE_PRD[2:0]*WAKE_RES. Default=001.
Maximum value is 7.
Resolution of WAKE timer: 1 – 1 minute, 0 – 2.5 seconds.
WD timer bit: Possible operations to this bit are:
Read: Gets the status of the flag IE_PLLFALL
Write 0: Clears the flag
Write 1:.Resets the WDT
The WD overflow status bit. This bit is set when the WD timer
overflows. It is powered by the non-volatile supply and at bootup
will indicate if the part is recovering from a WD overflow or a power
fault. This bit should be cleared by the MPU on bootup. It is also
automatically cleared when RESET is high.
Write operations on the RTC registers must be preceded by a write
operation to WE.
VERSION[7:0]
0000 0110
Silicon Version
A06
Page: 81 of 107