POWER FAILS AND ONE OR MORE OF THE SUPPLIES, VCC, V
CELL1
, V
CELL2
,
AND V
CELL3
DO NOT MEET MINIMUM VOLTAGE REQUIREMENTS
WKUP goes above or below
threshold (edge triggered).
Or, SLEEP bit is set to ‘0’
I
2
C INTERFACE IS DISABLED. BIASING IS
DISABLED. ALL REGISTERS SET TO DEFAULT
VALUES (ALL “0”)
POWER DOWN STATE
I
2
C INTERFACE IS ENABLED. BIASING IS
ENABLED. VOLTAGE REGULATOR IS
ENABLED.
POWER UP STATE
VOLTAGE REGULATOR IS ON
LOGIC AND REGISTERS ARE POWERED
BY RGO
TEMPERATURE MONITOR CIRCUITS ARE
ACTIVE (DEFAULT).
VOLTAGE AND TEMPERATURE
MONITORING CIRCUITS ARE AWAITING
EXTERNAL CONTROL.
MAIN OPERATING STATE
Power is applied and all of the supplies, VCC, V
CELL1
, V
CELL2
,
and V
CELL3
meet minimum voltage requirements
VOLTAGE REGULATOR IS OFF
BIASING IS OFF
LOGIC AND REGISTERS ARE POWERED
BY V
CELL1
VOLTAGE AND TEMPERATURE
MONITORING CIRCUITS ARE OFF.
I
2
C COMMUNICATION IS ACTIVE (IF
VCELL1 VOLTAGE IS HIGH ENOUGH TO
OPERATE WITH THE EXTERNAL DEVICE.)
SLEEP STATE
SLEEP bit is set to ‘1’
FIGURE 11. DEVICE OPERATION STATE MACHINE
