71m6532f-igt Maxim Integrated Products, Inc., 71m6532f-igt Datasheet - Page 56
71m6532f-igt
Manufacturer Part Number
71m6532f-igt
Description
Energy Meter Ic
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
1.71M6532F-IGT.pdf
(120 pages)
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either LCD mode or SLEEP mode, as controlled by the MPU via the I/O RAM bits LCD_ONLY and SLEEP.
The transition from MISSION mode to BROWNOUT mode is signaled by the IE_PLLFALL interrupt flag
(SFR 0xE8[7]). The transition in the other direction is signaled by the IE_PLLRISE interrupt flag (SFR
0xE8[6]), when the PLL becomes stable.
Data Sheet 71M6531D/F-71M6532D/F
2.3
Shortly after system power (V3P3SYS) is applied, the part will be in MISSION mode. MISSION mode
means that the part is operating with system power and that the internal PLL is stable. This mode is the
normal operation mode where the part is capable of measuring energy.
When system power is not available (i.e. when V1<VBIAS), the 71M6531 will be in one of three battery
modes: BROWNOUT, LCD, or SLEEP mode.
modes, with the possible transitions between modes. For information on the timing of mode transitions
refer to
When V1 falls below VBIAS or the part wakes up under battery power, the part will automatically enter
BROWNOUT mode (see Section
56
Figure 22
Similarly, meters equipped with batteries need to contain code that transitions the chip to SLEEP
mode as soon as the battery is attached in production. Otherwise, remaining in BROWNOUT
mode would unnecessarily drain the battery.
Battery Modes
Meters that do not require functionality in the battery modes, e.g. meters that only use the SLEEP
mode to maintain the RTC, still need to contain code that brings the chip from BROWNOUT
mode to SLEEP mode. Otherwise, the chip remains in BROWNOUT mode once the system
power is missing and consumes more current than intended.
through
V3P3SYS
rises
LCD
© 2005-2010 TERIDIAN Semiconductor Corporation
LCD_ONLY
Figure
PB
VBAT_OK
Figure 21: Operation Modes State Diagram
IE_PB
24.
2.5 Wake-Up
timer
IE_PLLRISE
BROWNOUT
V3P3SYS
VBAT_OK
MISSION
RESET &
rises
IE_WAKE
Figure 21
Behavior). From BROWNOUT mode, the part may enter
PB
IE_PLLFALL
V3P3SYS
shows a state diagram of the various operation
falls
timer
SLEEP
VBAT_OK
RESET &
SLEEP or
VBAT_OK
RESET
V3P3SYS
rises
V1 <= VBIAS
V1 > VBIAS
VBAT_OK
FDS 6531/6532 005
v1.3
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