Os motores de busca de Datasheet de Componentes eletrônicos
  Portuguese  ▼
ALLDATASHEETPT.COM

X  

ISL12029 Folha de dados(PDF) 11 Page - Intersil Corporation

Nome de Peças ISL12029
Descrição Electrónicos  Real Time Clock/Calendar with EEPROM
Download  28 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricante Electrônico  INTERSIL [Intersil Corporation]
Página de início  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL12029 Folha de dados(HTML) 11 Page - Intersil Corporation

Back Button ISL12029 Datasheet HTML 7Page - Intersil Corporation ISL12029 Datasheet HTML 8Page - Intersil Corporation ISL12029 Datasheet HTML 9Page - Intersil Corporation ISL12029 Datasheet HTML 10Page - Intersil Corporation ISL12029 Datasheet HTML 11Page - Intersil Corporation ISL12029 Datasheet HTML 12Page - Intersil Corporation ISL12029 Datasheet HTML 13Page - Intersil Corporation ISL12029 Datasheet HTML 14Page - Intersil Corporation ISL12029 Datasheet HTML 15Page - Intersil Corporation Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 28 page
background image
11
FN6206.6
October 18, 2006
read by performing a sequential read. The read instruction
latches all Clock registers into a buffer, so an update of the
clock does not change the time being read. A sequential
read of the CCR will not result in the output of data from the
memory array. At the end of a read, the master supplies a
stop condition to end the operation and free the bus. After a
read of the CCR, the address remains at the previous
address +1 so the user can execute a current address read
of the CCR and continue reading the next Register.
Real Time Clock Registers (Volatile)
SC, MN, HR, DT, MO, YR: Clock/Calendar Registers
These registers depict BCD representations of the time. As
such, SC (Seconds) and MN (Minutes) range from 00 to 59,
HR (Hour) is 1 to 12 with an AM or PM indicator (H21 bit) or
0 to 23 (with MIL = 1), DT (Date) is 1 to 31, MO (Month) is 1
to 12, YR (Year) is 0 to 99.
DW: Day of the Week Register
This register provides a Day of the Week status and uses
three bits DY2 to DY0 to represent the seven days of the
week. The counter advances in the cycle 0-1-2-3-4-5-6-0-1-
2-… The assignment of a numerical value to a specific day
of the week is arbitrary and may be decided by the system
software designer. The default value is defined as ‘0’.
Y2K: Year 2000 Register
Can have value 19 or 20. As of the date of the introduction of
this device, there would be no real use for the value 19 in a
true real time clock, however.
24 Hour Time
If the MIL bit of the HR register is 1, the RTC uses a 24-hour
format. If the MIL bit is 0, the RTC uses a 12-hour format and
H21 bit functions as an AM/PM indicator with a ‘1’,
representing PM. The clock defaults to standard time with
H21 = 0.
Leap Years
Leap years add the day February 29 and are defined as
those years that are divisible by 4.
Status Register (SR) (Volatile)
The Status Register is located in the CCR memory map at
address 003Fh. This is a volatile register only and is used to
control the WEL and RWEL write enable latches, read power
status and two alarm bits. This register is separate from both
the array and the Clock/Control Registers (CCR).
BAT: Battery Supply
This bit set to “1” indicates that the device is operating from
VBAT, not VDD. It is a read-only bit and is set/reset by
hardware (ISL12029 internally). Once the device begins
operating from VDD, the device sets this bit to “0”.
AL1, AL0: Alarm Bits
These bits announce if either alarm 0 or alarm 1 match the
real time clock. If there is a match, the respective bit is set to
‘1’. The falling edge of the last data bit in a SR Read
operation resets the flags. Note: Only the AL bits that are set
when an SR read starts will be reset. An alarm bit that is set
by an alarm occurring during an SR read operation will
remain set after the read operation is complete.
OSCF: Oscillator Fail Indicator
This bit is set to “1” if the oscillator is not operating. The bit is
set to “0” only if the oscillator is functioning. This bit is read
only, and is set /reset by hardware.
RWEL: Register Write Enable Latch
This bit is a volatile latch that powers up in the LOW
(disabled) state. The RWEL bit must be set to “1” prior to any
writes to the Clock/Control Registers. Writes to RWEL bit do
not cause a nonvolatile write cycle, so the device is ready for
the next operation immediately after the stop condition. A
write to the CCR requires both the RWEL and WEL bits to be
set in a specific sequence.
WEL: Write Enable Latch
The WEL bit controls the access to the CCR during a write
operation. This bit is a volatile latch that powers up in the
LOW (disabled) state. While the WEL bit is LOW, writes to
the CCR address will be ignored, although acknowledgment
is still issued. The WEL bit is set by writing a “1” to the WEL
bit and zeroes to the other bits of the Status Register. Once
set, WEL remains set until either reset to 0 (by writing a “0”
to the WEL bit and zeroes to the other bits of the Status
Register) or until the part powers up again. Writes to WEL bit
do not cause a nonvolatile write cycle, so the device is ready
for the next operation immediately after the stop condition.
RTCF: Real Time Clock Fail Bit
This bit is set to a “1” after a total power failure. This is a
read only bit that is set by hardware (ISL12029 internally)
when the device powers up after having lost all power to
the device (both VDD and VBAT go to 0V). The bit is set
regardless of whether VDD or VBAT is applied first. The loss
of only one of the supplies does not set the RTCF bit to “1”.
On power up after a total power failure, all registers are set
to their default states and the clock will not increment until
at least one byte is written to the clock register. The first
valid write to the RTC section after a complete power failure
resets the RTCF bit to “0” (writing one byte is sufficient).
Unused Bits:
Bit 3 in the SR is not used, but must be zero. The Data Byte
output during a SR read will contain a zero in this bit location.
TABLE 1. STATUS REGISTER (SR)
ADDR
7
6
5
4
3
2
1
0
003Fh
BAT
AL1
AL0
OSCF
0
RWEL
WEL
RTCF
Default
0
0
0
0
0
0
0
1
ISL12029


Nº de peça semelhante - ISL12029

Fabricante ElectrônicoNome de PeçasFolha de dadosDescrição Electrónicos
logo
Intersil Corporation
ISL12029 INTERSIL-ISL12029 Datasheet
580Kb / 30P
   Real Time Clock/Calendar with I2C Bus??and EEPROM
ISL12029 INTERSIL-ISL12029 Datasheet
580Kb / 29P
   Real Time Clock/Calendar with I2C Bus??and EEPROM
ISL12029 INTERSIL-ISL12029 Datasheet
768Kb / 6P
   High-Accuracy RTC Modules, Feature-Rich RTCs
ISL12029 INTERSIL-ISL12029 Datasheet
9Mb / 44P
   Providing high-performance solutions for every link in the signal chain
logo
Renesas Technology Corp
ISL12029 RENESAS-ISL12029 Datasheet
1Mb / 29P
   Real Time Clock/Calendar with I2C Bus™ and EEPROM
December 16, 2010
More results

Descrição semelhante - ISL12029

Fabricante ElectrônicoNome de PeçasFolha de dadosDescrição Electrónicos
logo
Intersil Corporation
ISL12027 INTERSIL-ISL12027_10 Datasheet
390Kb / 28P
   Real Time Clock/Calendar with EEPROM
logo
Xicor Inc.
X1240 XICOR-X1240 Datasheet
74Kb / 19P
   Real Time Clock/Calendar with EEPROM
logo
Intersil Corporation
ISL12027 INTERSIL-ISL12027 Datasheet
414Kb / 28P
   Real Time Clock/Calendar with EEPROM
logo
Renesas Technology Corp
ISL12027 RENESAS-ISL12027 Datasheet
1Mb / 29P
   Real Time Clock/Calendar with EEPROM
logo
Intersil Corporation
ISL12026 INTERSIL-ISL12026 Datasheet
381Kb / 24P
   Real Time Clock/Calendar with EEPROM
logo
Xicor Inc.
X1226 XICOR-X1226 Datasheet
420Kb / 24P
   Real Time Clock/Calendar with EEPROM
logo
Intersil Corporation
ISL12028 INTERSIL-ISL12028 Datasheet
423Kb / 28P
   Real Time Clock/Calendar with EEPROM
X1226 INTERSIL-X1226_06 Datasheet
372Kb / 25P
   Real Time Clock/Calendar with EEPROM
X1226 INTERSIL-X1226 Datasheet
388Kb / 25P
   Real Time Clock/Calendar with EEPROM
X1243 INTERSIL-X1243 Datasheet
293Kb / 17P
   Real Time Clock/Calendar/Alarm with EEPROM
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28


Folha de dados Download

Go To PDF Page


Ligação URL




Privacy Policy
ALLDATASHEETPT.COM
ALLDATASHEET é útil para você?  [ DONATE ] 

Sobre Alldatasheet   |   Publicidade   |   Contato conosco   |   Privacy Policy   |   roca de Link   |   Lista de Fabricantes
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com