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Maxim Integrated Semiconductor Electronic Components Datasheet

DS1825 Datasheet

Programmable Resolution 1-Wire Digital Thermometer

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DS1825 pdf
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DS1825
Programmable Resolution 1-Wire
Digital Thermometer With 4-Bit ID
www.maxim-ic.com
FEATURES
§ Unique 1-WireÒ Interface Requires Only One
Port Pin for Communication
§ Each Device has a Unique 64-Bit Serial Code
Stored in an On-Board ROM
§ Multidrop Capability Simplifies Distributed
Temperature-Sensing Applications
§ 4 Pin-Programmable Bits to Uniquely Identify
Up to 16 Sensor Locations on a Bus
§ Requires No External Components
§ Can be Powered from Data Line. Power Supply
Range: 3.0V to 3.7V
§ Measures Temperatures from -55°C to +125°C
(-67°F to +257°F)
§ ±0.5°C Accuracy from -10°C to +85°C
§ Thermometer Resolution is User-Selectable
from 9 to 12 Bits
§ Converts Temperature to 12-Bit Digital Word in
750ms (max)
§ User-Definable (NV) Alarm Settings
§ Alarm Search Command Identifies and
Addresses Devices Whose Temperature is
Outside of Programmed Limits (Temperature
Alarm Condition)
§ Available in 8-Pin mSOP Package
§ Software Compatible with the DS1822
1-Wire is a registered trademark of Dallas Semiconductor.
PIN ASSIGNMENT
VDD
DQ
N.C.
GND
18
27
DS1825
3 8-pin mSOP6
(DS1825U)
45
µSOP
(DS1825U)
AD3
AD2
AD1
AD0
PIN DESCRIPTION
GND
- Ground
DQ - Data In/Out
N.C.
- No Connect
VDD
AD0 to AD3
- Power Supply Voltage
- Address Pins
APPLICATIONS
Thermostatic Controls
Industrial Systems
Consumer Products
Thermometers
Thermally-Sensitive Systems
DESCRIPTION
The DS1825 digital thermometer provides 9 to 12-bit centigrade temperature measurements and has an alarm
function with NV user-programmable upper and lower trigger points. The DS1825 communicates over a 1-Wire bus
that by definition requires only one data line (and ground) for communication with a central microprocessor. It has
an operating temperature range of -55°C to +125°C and is accurate to ±0.5°C over the range of -10°C to +85°C. In
addition, the DS1825 can derive power directly from the data line (“parasite power”), eliminating the need for an
external power supply.
ORDERING INFORMATION
ORDERING NUMBER
PACKAGE MARKING
DESCRIPTION
DS1825U
1825
8-pin µSOP
DS1825U/T&R
1825
8-pin µSOP Tape-and-Reel
DS1825U+
DS1825U+T&R
1825 (See Note 1)
1825 (See Note 1)
8-pin mSOP, Lead Free
8-pin µSOP Tape-and-Reel, Lead Free
Note 1: Additionally, a "+" symbol will be marked on the package.
1 of 21
Rev 020105


Maxim Integrated Semiconductor Electronic Components Datasheet

DS1825 Datasheet

Programmable Resolution 1-Wire Digital Thermometer

No Preview Available !

DS1825 pdf
DS1825 Programmable Resolution 1-Wire Digital Thermometer With 4-Bit ID
DESCRIPTION (cont.)
Each DS1825 has a unique 64-bit serial code, which allows multiple DS1825s to function on the same 1-Wire bus;
thus, it is simple to use one microprocessor to control many DS1825s distributed over a large area. In addition, the
4-bit location address can be used to identify specific temperature sensors in the system without requiring a wide
lookup table. Applications that can benefit from this feature include HVAC environmental controls, temperature
monitoring systems inside buildings, equipment or machinery, and process monitoring and control systems.
ABSOLUTE MAXIMUM RATINGS*
Voltage on Any Pin Relative to Ground
-0.5V to +6.0V
Operating Temperature Range
Storage Temperature Range
-55°C to +125°C
-55°C to +125°C
Solder Dip Temperature (10s)
+260°C
Reflow Oven Temperature
+220°C
These are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operation
sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.
DC ELECTRICAL CHARACTERISTICS
PARAMETER
SYMBOL
CONDITION
Supply Voltage
VDD Local Power
Pullup Supply Voltage
VPU
Parasite Power
Local Power
Thermometer Error
tERR
-10°C to +85°C
-55°C to +125°C
Programming
Resistor: AD0-AD3
RPGM
DQ Input Logic Low
VIL(DQ)
(-55°C to +125°C; VDD= 3.0V to 3.7V)
MIN TYP
MAX
UNITS NOTES
+3.0
+3.7
V1
+3.0
+3.0
+3.7
VDD
±0.5
±2
V 1, 2
°C
°C
3
0 10 kW 12
-0.3
+0.7
V 1, 4, 5
DQ Input Logic High
VIH(DQ)
Local Power +2.2
Parasite Power +3.0
The lower of
3.7
or
VDD + 0.3
V
1, 6
Sink Current
Standby Current
Active Current
DQ Input Current
Drift
IL
VI/O = 0.4V
4.0
mA 1
IDDS
500 1000
nA 7, 8
IDD VDD = 3.7V
0.65
1.5
mA 9
IDQ 5 µA 10
±0.2 °C 11
NOTES:
1. All voltages are referenced to ground.
2. The Pullup Supply Voltage specification assumes that the pullup device is ideal, and therefore the high level of the pullup is equal to VPU.
In order to meet the VIH spec of the DS1825, the actual supply rail for the strong pullup transistor must include margin for the voltage drop
across the transistor when it is turned on; thus: VPU_ACTUAL = VPU_IDEAL + VTRANSISTOR.
3. See typical performance curve in Figure 18
4. Logic low voltages are specified at a sink current of 4mA.
5. To guarantee a presence pulse under low voltage parasite power conditions, VILMAX may have to be reduced to as low as 0.5V.
6. Logic high voltages are specified at a source current of 1mA.
7. Standby current specified up to 70°C. Standby current typically is 3mA at 125°C.
8. To minimize IDDS, DQ should be within the following ranges: GND £ DQ £ GND + 0.3V or VDD - 0.3V £ DQ £ VDD.
9. Active current refers to supply current during active temperature conversions or EEPROM writes.
10. DQ line is high (“hi-Z” state).
11. Drift data is based on a 1000 hour stress test at 125°C.
12. Inputs AD0-AD3 must be tied either High or Low. A "Low" is a connection to the GND terminal. A "High" connection varies with usage of
the DS1825. When connected as a parasite powered sensor, a connection to DQ is considered a High. When powered through the VDD
pin, a connection to VDD is a High. If left floating, the input values are indeterminate and may be either logical "0" or logical "1." See
Figures 20 and 21 for details. When optional programming resistors are used, their maximum values are 10,000W.
2 of 21


Part Number DS1825
Description Programmable Resolution 1-Wire Digital Thermometer
Maker Maxim Integrated Products
Total Page 21 Pages
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