71M6521BE
Energy Meter IC
DATA SHEET
JANUARY 2008
System
Power
(V3P3SYS)
V1_OK
Battery
Current
300nA
BROWNOUT
Transition
MISSION
MPU Mode
WAKE
13..14 CK
cycles
MPU Clock
Source
PLL
(4.2MHz/MUX_DIV)
Xtal
2048...4096
CK32 cycles
PLL_OK
time
Figure 22: Transition from BROWNOUT to MISSION Mode when System Power Returns
V3P3SYS
and VBAT
V1_OK
Battery
300nA
Current
BROWN-
OUT
MISSION
MPU Mode
MPU Clock
Source
PLL
(4.2MHz)
Xtal
14.5 CK32
cycles
WAKE
4096 CK32
cycles
PLL_OK
Internal
RESETZ
1024 CK32
cycles
time
Figure 23: Power-Up Timing with V3P3SYS and VBAT tied together
V1.0
© 2005-2008 TERIDIAN Semiconductor Corporation
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