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PDF DS1305 Data sheet ( Hoja de datos )
| Número de pieza | DS1305 | |
| Descripción | Serial Alarm Real Time Clock RTC | |
| Fabricantes | Dallas Semiconducotr | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de DS1305 (archivo pdf) en la parte inferior de esta página. Total 22 Páginas | ||
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DS1305
Serial Alarm Real Time Clock (RTC)
www.dalsemi.com
FEATURES
Real time clock counts seconds, minutes,
hours, date of the month, month, day of the
week and year with leap year compensation
valid up to 2100
96-byte nonvolatile RAM for data storage
Two time-of-day alarms programmable on
combination of seconds, minutes, hours and
day of the week
Serial interface supports Motorola serial
peripheral interface (SPI) serial data ports or
standard 3-wire interface
Burst mode for reading/writing successive
addresses in clock/RAM
Dual power supply pins for primary and
backup power supplies
Optional trickle charge output to backup
supply
2.0 - 5.5V operation
Optional industrial temperature range
-40°C to +85°C
Available in space-efficient, 20-pin TSSOP
package
Recognized by Underwriters Laboratory
ORDERING INFORMATION
DS1305
16-Pin DIP
DS1305N
16-Pin DIP (Industrial)
DS1305E
20-Pin TSSOP
DS1305EN 20-Pin TSSOP (Industrial)
PIN ASSIGNMENT
VCC2
VBAT
X1
NC
X2
NC
INT0
NC
INT1
GND
1
2
3
4
5
6
7
8
9
10
20 VCC1
19 NC
18 PF
17 VCCIF
16 SD0
15 SDI
14 SCLK
13 NC
12 CE
11 SERMODE
DS1305 20-Pin TSSOP (173 mil)
VCC2
VBAT
X1
X2
NC
INT0
INT1
GND
1
2
3
4
5
6
7
8
16 VCC1
15 PF
14 VCCIF
13 SDO
12 SDI
11 SCLK
10 CE
9 SERMODE
DS1305 16-Pin DIP (300 mil)
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070900
1 page  
DS1305
RTC AND RAM ADDRESS MAP
The address map for the RTC and RAM registers of the DS1305 is shown in Figure 2. Data is written to
the RTC by writing to address locations 80h to 9Fh and is written to the RAM by writing to address
locations A0h to FFh. RTC data is read by reading address locations 00h to 1Fh and RAM data is read by
reading address locations 20h to 7Fh.
ADDRESS MAP Figure 2
00H CLOCK/CALENDAR
1FH READ ADDRESSES ONLY
20H 96-BYTES USER RAM
7FH READ ADDRESSES ONLY
80H CLOCK/CALENDAR
9FH WRITE ADDRESSES ONLY
A0H 96-BYTES USER RAM
FFH WRITE ADDRESSES ONLY
CLOCK, CALENDAR AND ALARM
The time and calendar information is obtained by reading the appropriate register bytes. The real time
clock registers are illustrated in Figure 3. The time, calendar and alarm are set or initialized by writing
the appropriate register bytes. Note that some bits are set to zero. These bits will always read 0
regardless of how they are written. Also note that registers 12h to 1Fh (read) and registers 92h to 9Fh are
reserved. These registers will always read 0 regardless of how they are written. The contents of the time,
calendar and alarm registers are in the binary-coded decimal (BCD) format.
Please note that the initial power on state of all registers in not defined. Therefore it is important to
enable the oscillator (EOSC = 0) and disable write protect (WP = 0) during initial configuration.
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Configuration 2: Backup Supply is a Rechargeable Battery or Super
Capacitor
DS1305
Configuration 3: Battery Operate Mode
FUNCTION TABLE Table 3
MODE
CE
SCLK
Disable Reset
L Input Disabled
Write
H CPOL=1*
SDI
Input Disabled
Data Bit Latch
SDO
High Z
High Z
Read
CPOL=0
H CPOL=1
X
Next data bit shift**
CPOL=0
* CPOL is the “Clock Polarity” bit that is set in the control register of the microcontroller.
** SDO remains at High Z until 8 bits of data are ready to be shifted out during a read.
11 of 22
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet DS1305.PDF ] | |
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