|
|
PDF IT7C4337 Data sheet ( Hoja de datos )
| Número de pieza | IT7C4337 | |
| Descripción | Real Time Clock | |
| Fabricantes | RayStar | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de IT7C4337 (archivo pdf) en la parte inferior de esta página. Total 26 Páginas | ||
|
No Preview Available !
Product Datasheet
IT7C4337
Real Time Clock
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Product Features
Product Description
Using external 32.768kHz quartz crystal
Supports I2C-Bus's high speed mode (400 kHz)
Includes time (Hour/Minute/Second) and calendar
(Year/Month/Date/Day) counter functions (BCD
code)
Programmable square wave output signal
Two Time-of-Day Alarms
Oscillator Stop Flag
Operating range: 1.8V to 5.5V
Ordering Information
Part Number
Package
IT7C4337WE Lead free and Green 8-Pin SOIC
IT7C4337UE Lead free and Green 8-Pin MSOP
IT7C4337ZEE Lead free and Green 8-Pin TDFN
IT7C4337TE Lead free and Green 8-Pin TSSOP
The IT7C4337 serial real-time clock is a low-power
clock/calendar with two programmable time-of-day
alarms and a programmable square-wave output.
Address and data are transferred serially via a 2-wire,
bidirectional bus. The clock/calendar provides seconds,
minutes, hours, day, date, month, and year information.
The date at the end of the month is automatically
adjusted for months with fewer than 31 days, including
corrections for leap year. The clock operates in either the
24-hour or 12-hour format with AM/PM indicator.
Table 1 shows the basic functions of IT7C4337. More
details are shown in section: overview of functions.
Table 1. Basic functions of IT7C4337
Item
Function
Crystal: 32.768kHz
Source
External input
1 Oscillator
Oscillator enable/disable
Oscillator fail detect
2 Time
Time display
12-hour
24-hour
Century bit
3 Alarm interrupt
4 Programmable square wave output (Hz)
IT7C4337
2
1, 4.096k, 8.192k, 32.768k
1
RayStar Microelectronics Technology Inc.
Ver: 1.0
1 page  
Product Datasheet
IT7C4337
Real Time Clock
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Function Description
Overview of Functions
Clock function
CPU can read or write data including the year (last two digits), month, date, day, hour, minute, and second. Any (two-digit) year
that is a multiple of 4 is treated as a leap year and calculated automatically as such until the year 2100.
Alarm function
This device has two alarm system (Alarm 1 and Alarm 2) that outputs interrupt signals from INTA or INTB to CPU when the date,
day of the week, hour, minute or second correspond to the setting. Each of them may output interrupt signal separately at a
specified time. The alarm is be selectable between on and off for matching alarm or repeating alarm.
Programmable square wave output
A square wave output enable bit controls square wave output at pin 7. Frequencies are selectable: 1, 4.096k, 8.192k, 32.768k Hz.
Interface with CPU
Data is read and written via the I2C bus interface using two signal lines: SCL (clock) and SDA (data).
Since the output of the I/O pin SDA is open drain, a pull-up resistor should be used on the circuit board if the CPU output I/O is
also open drain.
The SCL's maximum clock frequency is 400 kHz, which supports the I2C bus's high-speed mode.
Oscillator fail detect
When oscillator fail, IT7C4337 OSF bit will be set.
Oscillator enable/disable
Oscillator and time count chain can be enabled or disabled at the same time by /ETIME bit.
5
RayStar Microelectronics Technology Inc.
Ver: 1.0
5 Page 
Product Datasheet
IT7C4337
Real Time Clock
|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Days of the week Counter
The day counter is a divide-by-7 counter that counts from 01 to 07 and up 07 before starting again from 01. Values that
correspond to the day of week are user defined but must be sequential (i.e., if 1 equals Sunday, then 2 equals Monday, and so on).
Illogical time and date entries result in undefined operation.
Addr.
Description
D7
D6
D5
D4
D3 D2 D1 D0
(hex)
03 Days of the week
0
0
0
(default)
0
0
0
0 0 W4 W2 W1
0 0 Undefined Undefined Undefined
Calendar Counter
The data format is BCD format.
Day digits: Range from 1 to 31 (for January, March, May, July, August, October and December).
Range from 1 to 30 (for April, June, September and November).
Range from 1 to 29 (for February in leap years).
Range from 1 to 28 (for February in ordinary years).
Carried to month digits when cycled to 1.
Month digits: Range from 1 to 12 and carried to year digits when cycled to 1.
Year digits: Range from 00 to 99 and 00, 04, 08, … , 92 and 96 are counted as leap years.
Addr.
Description D7 D6 D5 D4 D3 D2 D1 D0
(hex)
04 Dates
(default)
0
0
D20 D10
D8
D4
D2
D1
0 0 Undefined Undefined Undefined Undefined Undefined Undefined
05
Months
Century*1
0
(default)
Undefined
0
0 M10 M8 M4 M2 M1
0 Undefined Undefined Undefined Undefined Undefined
06 Years
Y80 Y40 Y20 Y10
Y8
Y4
Y2
Y1
(default)
Undefined Undefined Undefined Undefined Undefined Undefined Undefined Undefined
*1: The century bit is toggled when the years register overflows from 99 to 00.
11
RayStar Microelectronics Technology Inc.
Ver:
1.0
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet IT7C4337.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| IT7C4337 | Real Time Clock | RayStar |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |