ISL12023IVZ Intersil, ISL12023IVZ Datasheet - Page 20

• Manufacturer Part Number: ISL12023IVZ
• Description: IC RTC/CLDR TEMP SNSR 14-TSSOP
• Manufacturer: Intersil
• Type: Clock/Calendarr

Specifications of ISL12023IVZ

• Memory Size: 1K (128 x 8)
• Time Format: HH:MM:SS (12/24 hr)
• Date Format: YY-MM-DD-dd
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 14-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

events is retained). Set CLRTS = 1 to clear this register (add
09h, PWR_V
DST Control Registers (DSTCR)
8 bytes of control registers have been assigned for the
Daylight Savings Time (DST) functions. DST beginning (set
Forward) time is controlled by the registers DstMoFd,
DstDwFd, DstDtFd, and DstHrFd. DST ending time (set
Backward or Reverse) is controlled by DstMoRv, DstDwRv,
DstDtRv and DstHrRv.
Tables 20 and 21 describe the structure and functions of the
DSTCR.
DST FORWARD REGISTERS (20H TO 23H)
DST forward is controlled by the following DST Registers:
DST Enable
DSTE is the DST Enabling Bit located in bit 7 of register 20h
(DstMoFdxx). Set DSTE = 1 will enable the DSTE function.
Upon powering up for the first time (including battery), the
DSTE bit defaults to “0”. When DSTE is set to “1” the RTC
time must be at least one hour before the scheduled DST
time change for the correction to take place. When DSTE is
set to “0”, the DSTADJ bit in the Status Register
automatically resets to “0”.
DST Month Forward
DstMoFd sets the Month that DST starts. The format is the
same as for the RTC register month, from 1 to 12. The
default value for the DST begin month is 00h.
DST Day/Week Forward
DstDwFd contains both the Day of the Week and the Week
of the Month data for DST Forward control. DST can be
controlled either by actual date or by setting both the Week
of the month and the Day of the Week. DstDwFdE sets the
priority of the Day/Week over the Date. For DstDwFdE = 1,
ADDRESS
ADDRESS
20h
21h
22h
23h
24h
25h
26h
27h
DD
Month Forward
Month Reverse
Hour Forward
Hour Reverse
Date Forward
Date Reverse
Day Forward
Day Reverse
FUNCTION
register).
NAME
20
DSTE
7
0
0
0
0
7
0
0
0
DwRvE
DwFdE
6
0
0
0
TABLE 20. DST FORWARD REGISTERS
6
0
0
0
TABLE 21. DST REVERSE REGISTERS
WkRv12
WkFd12
HrRv21
DtRv21
HrFd21
DtFd21
ISL12023
5
0
5
0
Day/Week is the priority. You must have the correct Day of
Week entered in the RTC registers for the Day/Week
correction to work properly.
• Bits 0, 1, 2 contain the Day of the week information which
• Bits 3, 4, 5 contain the Week of the Month information that
DST Date Forward
DstDtfd controls which Date DST begins. The format for the
Date is the same as for the RTC register, from 1 to 31. The
default value for DST forward date is 00h. DstDtFd is only
effective if DstDwFdE = 0.
DST Hour Forward
DstHrFd controls the hour that DST begins. The RTC hour
and DstHrFd registers have the same formats except there
is no Military bit for DST hour. The user sets the DST hour
with the same format as used for the RTC hour (AM/PM or
MIL) but without the MIL bit, and the DST will still advance as
if the MIL bit were there. The default value for DST hour
Forward is 00h.
DST REVERSE REGISTERS (24H TO 27H)
DST end (reverse) is controlled by the following DST Registers:
DST Month Reverse
DstMoRv sets the Month that DST ends. The format is the
same as for the RTC register month, from 1 to 12. The
default value for the DST end month is October (10h).
MoRv20
WkRv11
MoFd20
WkFd11
DtRv20
HrRv20
HrFd20
DtFd20
sets the Day of the Week that DST starts. Note that Day of
the week counts from 0 to 6, like the RTC registers. The
default for the DST Forward Day of the Week is 00h
(normally Sunday).
sets the week that DST starts. The range is from 1 to 5,
and Week 7 is used to indicate the last week of the month.
The default for the DST Forward Week of the Month is
00h.
4
4
WkRv10
MoRv13
MoFd13
WkFd10
HrRv13
HrFd13
DtRv13
DtFd13
3
3
MoRv12
DwRv12
MoFd12
DwFd12
HrRv12
HrFd12
DtRv12
DtFd12
2
2
DwRv11
DwFd11
MoRv11
MoFd11
HrRv11
DtFd11
HrFd11
DtRv11
1
1
June 24, 2009
DwRv10
MoFd10
DwFd10
MoRv10
HrFd10
DtRv10
HrRv10
DtFd10
FN6682.2
0
0