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PDF DS1308 Data sheet ( Hoja de datos )
| Número de pieza | DS1308 | |
| Descripción | (DS1307) 64 x 8 Serial Real Time Clock | |
| Fabricantes | Dallas Semiconductor | |
| Logotipo |  |
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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
56 byte nonvolatile RAM for data storage
2-wire serial interface
Programmable squarewave output signal
Automatic power-fail detect and switch
circuitry
Consumes less than 500 nA in battery backup
mode with oscillator running
Optional industrial temperature range
-40°C to +85°C (IND) available for DS1307
and DS1308
DS1307 available in 8-pin DIP or SOIC
DS1308 available in 36-pin SMD BGA (Ball
Grid Array)
DS1308 accuracy is better than ±2
minute/month at 25°C
Recognized by Underwriters Laboratory
ORDERING INFORMATION
DS1307
8-Pin DIP
DS1307Z
8-Pin SOIC (150 mil)
DS1307N
8-Pin DIP (Industrial)
DS1307ZN
8-Pin SOIC (Industrial)
DS1308
36-Pin BGA
DS1308N
36-Pin BGA (Industrial)
DS1307/DS1308
64 X 8 Serial Real Time Clock
PIN ASSIGNMENT
X1 l
8 VCC
X2 2 7 SQW/OUT
VBAT 3 6 SCL
GND 4 5 SDA
DS1307 8-Pin DIP (300 mil)
X1 l
8 VCC
X2 2 7 SQW/OUT
VBAT 3 6 SCL
GND 4 5 SDA
DS1307Z 8-Pin SOIC (150 mil)
GND
VBAT
GND
SCL
GND
AB CD
1 GND
2 VCC
3
4 SQW/
5 OUT
6 GND
7
8
SDA
9 GND
DS1308 36-Pin SMD BGA
(Top View)
PIN DESCRIPTION DS1307/DS1308
VCC
X1, X2
- Primary Power Supply
- 32.768 kHz Crystal Connection
VBAT
GND
- +3V Battery Input
- Ground
SDA
- Serial Data
SCL - Serial Clock
SQW/OUT - Square wave/Output Driver
DS1308 PIN IDENTIFIER
VCC - C2, C3, D2, D3
VBAT
- A4, A5, B4, B5
SDA
- C7, C8, D7, D8
SCL - A7, A8, B7, B8
SQW/OUT - C4, C5, D4, D5
GND
- All Remaining Balls
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070900
1 page  
DS1307/1308
CONTROL REGISTER
The DS1307/DS1308 Control Register is used to control the operation of the SQW/OUT pin.
BIT 7
OUT
BIT 6
X
BIT 5
X
BIT 4
SQWE
BIT 3
X
BIT 2
X
BIT 1
RS1
BIT 0
RS0
OUT (Output control): This bit controls the output level of the SQW/OUT pin when the square wave
output is disabled. If SQWE=0, the logic level on the SQW/OUT pin is 1 if OUT=1 and is 0 if OUT=0.
SQWE (Square Wave Enable): This bit, when set to a logic 1, will enable the oscillator output. The
frequency of the square wave output depends upon the value of the RS0 and RS1 bits.
RS (Rate Select): These bits control the frequency of the square wave output when the square wave
output has been enabled. Table 1 lists the square wave frequencies that can be selected with the RS bits.
SQUAREWAVE OUTPUT FREQUENCY Table 1
RS1 RS0
00
01
10
11
SQW OUTPUT
FREQUENCY
1 Hz
4.096 kHz
8.192 kHz
32.768 kHz
2-WIRE SERIAL DATA BUS
The DS1307 supports a bi-directional 2-wire bus and data transmission protocol. A device that sends
data onto the bus is defined as a transmitter and a device receiving data as a receiver. The device that
controls the message is called a master. The devices that are controlled by the master are referred to as
slaves. The bus must be controlled by a master device which generates the serial clock (SCL), controls
the bus access, and generates the START and STOP conditions. The DS1307/DS1308 operates as a slave
on the 2-wire bus. A typical bus configuration using this 2-wire protocol is show in Figure 4.
TYPICAL 2-WIRE BUS CONFIGURATION Figure 4
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5 Page 
TIMING DIAGRAM Figure 8
DS1307/1308
DS1307 64 X 8 SERIAL REAL TIME CLOCK
8-PIN DIP MECHANICAL DIMENSIONS
PKG
DIM
A IN.
MM
B IN.
MM
C IN.
MM
D IN.
MM
E IN.
MM
F IN.
MM
G IN.
MM
H IN.
MM
J IN.
MM
K IN.
MM
8-PIN
MIN MAX
0.360 0.400
9.14 10.16
0.240 0.260
6.10 6.60
0.120 0.140
3.05 3.56
0.300 0.325
7.62 8.26
0.015 0.040
0.38 1.02
0.120 0.140
3.04 3.56
0.090 0.110
2.29 2.79
0.320 0.370
8.13 9.40
0.008 0.012
0.20 0.30
0.015 0.021
0.38 0.53
11 of 14
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet DS1308.PDF ] | |
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