DS1629 Datasheet PDF - Dallas
| Part Number | DS1629 | |
| Description | 2-Wire Digital Thermometer and Real Time Clock | |
| Manufacturers | Dallas | |
| Logo |  |
|
|
There is a preview and DS1629 download ( pdf file ) link at the bottom of this page. Total 22 Pages | ||
Preview 1 page No Preview Available !
www.dalsemi.com
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 - 5.5V)
§ Applications include personal
computers/PDAs, cellular telephones, office
equipment, dataloggers, or any thermally
sensitive system
§ 8-pin 150mil SOIC package
PIN ASSIGNMENT
SDA
SCL
ALRM
GND
1
2
3
4
8 VDD
7 OSC
6 X1
5 X2
DS1629S 8-Pin SOIC
(150-mil)
PIN DESCRIPTION
SDA
- 2-Wire Serial Data Input/Output
SCL - 2-Wire Serial Clock
GND
- Ground
ALRM
- Thermostat & Clock Alarm
Output
X1 - 32.768 kHz Crystal Input
X2 - 32.768 kHz 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 integrates the critical functions of a real
time clock and a temperature monitor in a small outline 8-pin SOIC 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 22
102299
|
| |
 
DS1629
At the same time, the counter is then preset with a value determined by the slope accumulator circuitry.
This circuitry is needed to compensate for the parabolic behavior of the oscillators over temperature. The
counter is then clocked again until it reaches 0. If the gate period is still not finished, then this process
repeats.
The slope accumulator is used to compensate for the nonlinear behavior of the oscillators over
temperature, yielding a high resolution temperature measurement. This is done by changing the number
of counts necessary for the counter to go through for each incremental degree in temperature. To obtain
the desired resolution, therefore, both the value of the counter and the number of counts per degree C (the
value of the slope accumulator) at a given temperature must be known.
Internally, this calculation is done inside the DS1629 to provide 0.5°C resolution. Table 2 describes the
exact relationship of output data to measured temperature. For Fahrenheit usage, a lookup table or
conversion factor must be used.
Note that temperature is represented in the DS1629 in terms of a 0.5°C LSB, yielding the 9-bit format
illustrated in Table 2. Higher resolutions may be obtained by implementing the algorithm in Application
Note 105 and performing the following calculation. The 8-bit COUNT_REMAIN value can be obtained
via the Read Counter (A8h) command and the COUNT_PER_C value (also 8-bit) is read via the Read
Slope command (A9h).
T = TEMP_READ -0.25 + (COUNT_PER_C_COUNT_REMAIN)
COUNT_PER_C
Temperature/Data Relationships Table 2
S 26 25 24 23
MSb (unit = °C)
2-1 0 0 0 0
22
0
21 20 MSB
LSb
0 0 LSB
TEMPERATURE
+125°C
+25°C
0.5°C
0°C
-0.5°C
-25°C
-55°C
DIGITAL OUTPUT
(Binary)
01111101 00000000
00011001 00000000
00000000 10000000
00000000 00000000
11111111 10000000
11100111 00000000
11001001 00000000
DIGITAL OUTPUT
(Hex)
7D00h
1900
0080
0000
FF80
E700h
C900h
5 of 22
102299
Preview 5 Page |
Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for DS1629 electronic component. |
| Information | Total 22 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ DS1629.PDF Datasheet ] | |
Share Link :
Electronic Components Distributor
|
An electronic components distributor is a company that sources, stocks, and sells electronic components to manufacturers, engineers, and hobbyists. |
| SparkFun Electronics | Allied Electronics | DigiKey Electronics | Arrow Electronics |
| Mouser Electronics | Adafruit | Newark | Chip One Stop |
Featured Datasheets
| Part Number | Description | MFRS |
| DS1620 | The function is Digital Thermometer and Thermostat. Dallas | |
| DS1621 | The function is Digital Thermometer and Thermostat. Dallas | |
| DS1624 | The function is Digital Thermometer and Memory. Dallas | |
Semiconductors commonly used in industry:
1N4148 |
BAW56 |
1N5400 |
NE555 | | ||
Quick jump to:
DS16
1N4
2N2
2SA
2SC
74H
BC
HCF
IRF
KA | ||