DS1202 Просмотр технического описания (PDF) - Dallas Semiconductor -> Maxim Integrated
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DS1202 Datasheet PDF : 11 Pages
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DS1202, DS1202S
DS1202, DS1202S
Serial Timekeeping Chip
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
• 24 x 8 RAM for scratchpad data storage
• Serial I/O for minimum pin count
• 2.0–5.5 volt full operation
• Uses less than 300 nA at 2 volts
• Single–byte or multiple–byte (burst mode) data trans-
fer for read or write of clock or RAM data
• 8–pin DIP or optional 16–pin SOIC for surface mount
• Simple 3–wire interface
• TTL–compatible (VCC = 5V)
• Optional industrial temperature range –40°C to +85°C
(IND)
ORDERING INFORMATION
DS1202
8–pin DIP
DS1202S 16–pin SOIC
DS1202S–8 8–pin SOIC
DS1202N 8–pin DIP (IND)
DS1202SN 16–pin SOIC (IND)
DS1202SN–8 8–pin SOIC (IND)
DESCRIPTION
The DS1202 Serial Timekeeping Chip contains a real
time clock/calendar and 24 bytes of static RAM. It com-
municates with a microprocessor via a simple serial in-
terface. The real time clock/calendar provides seconds,
minutes, hours, day, date, month, and year information.
The end of the month date is automatically adjusted for
months with less than 31 days, including corrections for
leap year. The clock operates in either the 24–hour or
12–hour format with an AM/PM indicator. Interfacing the
PIN ASSIGNMENT
NC
X1
X2
GND
1
8
2
7
3
6
4
5
8–PIN DIP
VCC
SCLK
I/O
RST
NC
X1
X2
GND
18
27
36
45
VCC
SCLK
I/O
RST
8–PIN SOIC
(208 mil)
NC
1
NC
2
X1
3
NC
4
X2
5
NC
6
NC
7
GND
8
16
VCC
15
NC
14
SCLK
13
NC
12
I/O
11
NC
10
NC
9
RST
16–PIN SOIC
PIN DESCRIPTION
NC
X1, X2
GND
RST
I/O
SCLK
VCC
– No Connection
– 32.768 KHz Crystal Input
– Ground
– Reset
– Data Input/Output
– Serial Clock
– Power Supply Pin
DS1202 with a microprocessor is simplified by using
synchronous serial communication. Only three wires
are required to communicate with the clock/RAM: (1)
RST (Reset), (2) I/O (Data line), and (3) SCLK (Serial
clock). Data can be transferred to and from the clock/
RAM one byte at a time or in a burst of up to 24 bytes.
The DS1202 is designed to operate on very low power
and retain data and clock information on less than 1 mi-
crowatt.
ECopyright 1997 by Dallas Semiconductor Corporation.
All Rights Reserved. For important information regarding
patents and other intellectual property rights, please refer to
Dallas Semiconductor data books.
032697 1/11
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