ISL12029 Intersil Corporation, ISL12029 Datasheet - Page 25

• Manufacturer Part Number: ISL12029
• Description: Real Time Clock/Calendar
• Manufacturer: Intersil Corporation

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(X1228
MODE
mode)
C
D
A
B
TABLE 10. I
V
SBIB
I
V
BIT
BAT
DD
I
0
0
1
1
BAT
DD
RESET
RESET
2
C, LV RESET, AND BATTERY BACKUP OPERATION SUMMARY (SHADED ROW IS SAME AS X1228 OPERATION)
V
(2.2V)
BSW
V
(2.2V)
TRIP
BIT
TRIP
0
1
0
1
V
V
RESET
RESET
25
V
V
Standard Mode,
Standard Mode,
SWITCHOVER
V
Legacy Mode,
Legacy Mode,
TRIP
TRIP
(2.63V)
V
V
BAT
(2.63V)
VOLTAGE
FIGURE 29. EXAMPLE RESET OPERATION IN MODE A OR C
DD
DD
V
VBAT
BAT
(3.0V)
= 2.2V typ
= 2.2V typ
< V
< V
(3.0V)
(VDD power, V
BAT
BAT
I
V
2
tPURST
C ACTIVE IN
YES, only if
BACKUP?
BAT
BATTERY
tPURST
BAT
FIGURE 30. RESET OPERATION IN MODE D
>V
NO
NO
NO
not connected)
RESET
ISL12029
I
2
I
READ IN BATTERY
C Bus Active
2
EE PROM WRITE/
C Bus Active
BACKUP?
YES
NO
NO
NO
FREQ/IRQ
ACTIVE?
YES
YES
YES
YES
Operation of I
V
communications. Battery switchover
at V
Operation of I
backup mode, but only for
V
Bus must have pullups to V
Operation of I
V
communications. Battery switchover
at V
Operation of I
or V
RESET
BAT
RESET
TRIP
TRIP
BAT
>V
(Battery backup mode)
(Battery backup mode)
, whichever is higher.
, then below that no
, then below that no
DD
.
.
>V
RESET
2
2
2
2
C bus down to V
C bus into battery
C bus down to V
C busdown to V
NOTES
.
BAT
April 17, 2006
RESET
.
DD
DD
FN6206.4
=
=