DS1629 Real-Time Clock Datasheet

DS1629 Datasheet, PDF, Equivalent


Part Number

DS1629

Description

2-Wire Digital Thermometer and Real-Time Clock

Manufacture

Maxim Integrated

Total Page 23 Pages
Datasheet
Download DS1629 Datasheet


DS1629
DS1629
2-Wire Digital Thermometer
and Real-Time Clock
FEATURES
Measures Temperatures from -55°C to
+125°C; Fahrenheit Equivalent is -67°F to
257°F
Real-Time Clock Counts Seconds, Minutes,
Hours, Date of the Month, Month, Day of the
Week, and Year with Leap Year
Compensation Through the Year 2100
Thermometer Accuracy is ±2.0°C (typ)
Thermometer Resolution is 9 Bits
(Expandable)
Thermostatic and Time Alarm Settings Are
User Definable; Dedicated Open-Drain Alarm
Output
32 Bytes SRAM for General Data Storage
Data is Read From/Written to via a 2-Wire
Serial Interface (Open Drain I/O Lines)
Wide Power Supply Range (2.2V to 5.5V)
Applications Include PCs/PDAs, Cellular
Telephones, Office Equipment, Data Loggers,
or Any Thermally Sensitive System
8-Pin (150-mil) SO Package
PIN CONFIGURATION
SDA
SCL
ALRM
GND
1 8 VDD
2 7 OSC
3 6 X1
4 5 X2
SO
(150 mils)
PIN DESCRIPTION
SDA
- 2-Wire Serial Data Input/Output
SCL - 2-Wire Serial Clock
GND
- Ground
ALRM
- Thermostat and Clock Alarm
Output
X1 - 32.768kHz Crystal Input
X2 - 32.768kHz Crystal Feedback
Output
OSC
- Buffered Oscillator Output
VDD - Power-Supply Voltage (+2.2V to
+5V)
DESCRIPTION
The DS1629 2-wire digital thermometer and real-time clock (RTC) integrates the critical functions of a
real-time clock and a temperature monitor in a small outline 8-pin SO package. Communication to the
DS1629 is accomplished via a 2-wire interface. The wide power-supply range and minimal power
requirement of the DS1629 allow for accurate time/temperature measurements in battery-powered
applications.
The digital thermometer provides 9-bit temperature readings which indicate the temperature of the device.
No additional components are required; the device is truly a “temperature-to-digital” converter.
The clock/calendar provides seconds, minutes, hours, day, date of the month, day of the week, month, and
year. The end of the month date is automatically adjusted for months with less than 31 days, including
corrections for leap years. It operates in either a 12- or 24-hour format with AM/PM indicator in 12-hour
mode. The crystal oscillator frequency is internally divided, as specified by device configuration. An
open-drain output is provided that can be used as the oscillator input for a microcontroller.
1 of 23
19-6849; Rev 11/13

DS1629
DS1629
The open-drain alarm output of the DS1629 will become active when either the measured temperature
exceeds the programmed overtemperature limit (TH) or current time reaches the programmed alarm
setting. The user can configure which event (time only, temperature only, either, or neither) will generate
an alarm condition. For storage of general system data or time/temperature data logging, the DS1629
features 32 bytes of SRAM. Applications for the DS1629 include personal computers/PDAs, cellular
telephones, office equipment, thermal data loggers, or any microprocessor-based, thermally-sensitive
system.
ORDERING INFORMATION
PART
DS1629S+
DS1629S+T&R
+Denotes a lead(Pb)-free/RoHS-compliant package.
T&R = Tape and reel.
TOP MARK
DS1629
DS1629
PIN-PACKAGE
8 SO (150 mils)
8 SO (150 mils) (2500 piece)
DETAILED PIN DESCRIPTION Table 1
PIN NAME
FUNCTION
1 SDA Data Input/Output Pin for 2-Wire Serial Communication Port
2 SCL Clock Input/Output Pin for 2-Wire Serial Communication Port
3
ALRM
Alarm Output. Open drain time/temperature alarm output with configurable active
state.
4 GND Ground
5 X2 32.768kHz Feedback Output
6 X1 32.768kHz Crystal Input
7 OSC Oscillator Output. Open-drain output used for microcontroller clock input.
8 VDD Supply Voltage. 2.2V to 5.5V input power pin.
OVERVIEW
A block diagram of the DS1629 is shown in Figure 1. The DS1629 consists of six major components:
1. Direct-to-digital temperature sensor
2. Real-time clock
3. 2-wire interface
4. Data registers
5. Thermal and clock alarm comparators
6. Oscillator divider and buffer
The factory-calibrated temperature sensor requires no external components. The very first time the
DS1629 is powered up it begins temperature conversions, and performs conversions continuously. The
host can periodically read the value in the temperature register, which contains the last completed
conversion. As conversions are performed in the background, reading the temperature register does not
affect the conversion in progress.
The host can modify DS1629 configuration such that it does not power up in the auto-convert or
continuous convert modes. This could be beneficial in power-sensitive applications.
2 of 23


Features DS1629 2-Wire Digital Thermometer and Re al-Time Clock FEATURES  Measures Te mperatures from -55°C to +125°C; Fahr enheit Equivalent is -67°F to 257°F Real-Time Clock Counts Seconds, Minu tes, Hours, Date of the Month, Month, D ay of the Week, and Year with Leap Year Compensation Through the Year 2100  Thermometer Accuracy is ±2.0°C (typ)  Thermometer Resolution is 9 Bits ( Expandable)  Thermostatic and Time A larm Settings Are User Definable; Dedic ated Open-Drain Alarm Output  32 Byt es SRAM for General Data Storage  Da ta is Read From/Written to via a 2-Wire Serial Interface (Open Drain I/O Lines )  Wide Power Supply Range (2.2V to 5.5V)  Applications Include PCs/PDAs , Cellular Telephones, Office Equipment , Data Loggers, or Any Thermally Sensit ive System  8-Pin (150-mil) SO Packa ge PIN CONFIGURATION SDA SCL ALRM GND 1 8 VDD 2 7 OSC 3 6 X1 4 5 X2 SO (150 mils) PIN DESCRIPTION SDA - 2-Wire Serial Data Input/Output SCL - 2-Wire Serial Clock GND - Ground ALRM - Thermostat an.
Keywords DS1629, datasheet, pdf, Maxim Integrated, 2-Wire, Digital, Thermometer, and, Real-Time, Clock, S1629, 1629, 629, DS162, DS16, DS1, Equivalent, stock, pinout, distributor, price, schematic, inventory, databook, Electronic, Components, Parameters, parts, cross reference, chip, Semiconductor, circuit, Electric, manual, substitute




@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)