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1 of 13 050307
GENERAL DESCRIPTION
This low-voltage (1.7V to 3.7V) digital thermometer
and thermostat provides 9, 10, 11, or 12-bit digital
temperature readings over a -55°C to +125°C range
with ±2°C accuracy over a -25°C to +100°C range. At
power-up, the DS75LX defaults to 9-bit resolution for
software compatibility with the LM75. Communication
with the DS75LX is achieved through a simple 2-wire
serial interface. Three tri-state address pins allow up
to 27 DS75LX devices to operate on the same 2-wire
bus, which greatly simplifies distributed temperature-
sensing applications.
The DS75LX thermostat has a dedicated open-drain
output (O.S.) and programmable fault tolerance,
which allow the user to define the number of
consecutive error conditions that must occur before
O.S. is activated. There are two thermostatic
operating modes that control thermostat operation
based on user-defined trip-points (T
OS
and T
HYST
).
APPLICATIONS
Any Thermally Sensitive System
Cellular Base Stations
Telecom Switches and Routers
Servers
PIN CONFIGURATIONS
FEATURES
1.7V to 3.7V Operating Range
Tri-State Address Pins Allow Up to 27 Unique
Bus Addresses
Temperature Measurements Require No
External Components
Measures Temperatures from -55°C to +125°C
(-67°F to +257°F)
±2°C Accuracy from -25°C to +100°C
Thermometer Resolution Is User-
Configurable from 9 (Default) to 12 Bits (0.5°C
to 0.0625°C Resolution)
9-Bit Conversion Time is 25ms (max)
Thermostatic Settings are User-Definable
Data is Read/Written Through 2-Wire Serial
Interface (SDA and SCL Pins)
Data Lines Filtered Internally for Noise
Immunity (50ns Deglitch)
Bus Timeout Feature Prevents Lockup
Problems on 2-Wire Interface
Multidrop Capability Simplifies Distributed
Temperature-Sensing Applications
Pin/Software Compatible with the LM75
Available in 8-Pin μSOP (μMAX
®
) and SO
Packages
ORDERING INFORMATION
PART TEMP RANGE
PIN
PACKAGE
DS75LXS+ -55°C to +125°C
8 SO
(150 mils)
DS75LXS+T&R -55°C to +125°C
8 SO
(150 mils),
2500 Piece
DS75LXU+ -55°C to +125°C
8 µSOP
(µMAX)
DS75LXU+T&R -55°C to +125°C
8 µSOP
(µMAX),
3000 Piece
+ Denotes lead-free package.
T&R denotes tape-and-reel.
Note: A “+” symbol will also be marked on the package near the
pin 1 indicator.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
DS75LX
Digital Thermometer and Thermostat
with Extended Addressing
www.maxim-ic.com
SO (150 mils)
SC
L
V
DD
A
0
A
1
A
2
GND
O.S.
S
D
A
6
8
7
5
3
1
2
4
DS75
LX
μ
SOP/
μ
MAX
SC
L
V
DD
A
0
A
1
A
2
GND
O.S.
S
D
A
6
8
7
5
3
1
2
4
DS75
LX
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Shrnutí obsahu

Strany 1 - ORDERING INFORMATION

1 of 13 050307 GENERAL DESCRIPTION This low-voltage (1.7V to 3.7V) digital thermometer and thermostat provides 9, 10, 11, or 12-bit digit

Strany 2 - ABSOLUTE MAXIMUM RATINGS

DS75LX: Digital Thermometer and Thermostat with Extended Addressing 10 of 13 Figure 5. Start, Stop, and ACK Signals Figure 6. Addre

Strany 3 - PIN DESCRIPTION

DS75LX: Digital Thermometer and Thermostat with Extended Addressing 11 of 13 Table 6. Address Configuration A2 A1 A0 ADDRESS 0 0 0 1001000 0

Strany 4 - Figure 1. Timing Diagram

DS75LX: Digital Thermometer and Thermostat with Extended Addressing 12 of 13 Writing to the DS75LX To write to the DS75LX, the master must gene

Strany 5 - Register Format

DS75LX: Digital Thermometer and Thermostat with Extended Addressing 13 of 13 Figure 8. 2-Wire Interface Timing (DS75LX)(DS75LX)AD2D6D5 D4D3D1D0

Strany 6 - Comparator Mode

DS75LX: Digital Thermometer and Thermostat with Extended Addressing 2 of 13 ABSOLUTE MAXIMUM RATINGS Voltage Range on VDD, Relative to Ground

Strany 7 - Configuration Register

DS75LX: Digital Thermometer and Thermostat with Extended Addressing 3 of 13 AC ELECTRICAL CHARACTERISTICS (continued) (1.7V ≤ VDD ≤ 3.7V, TA =

Strany 8 - REGISTER POINTER

DS75LX: Digital Thermometer and Thermostat with Extended Addressing 4 of 13 BLOCK DIAGRAM Figure 1. Timing Diagram

Strany 9 - 2-WIRE SERIAL DATA BUS

DS75LX: Digital Thermometer and Thermostat with Extended Addressing 5 of 13 OPERATION—MEASURING TEMPERATURE The DS75LX measures temperature usi

Strany 10 - GENERAL 2-WIRE INFORMATION

DS75LX: Digital Thermometer and Thermostat with Extended Addressing 6 of 13 Shutdown Mode For power-sensitive applications, the DS75LX offers

Strany 11

DS75LX: Digital Thermometer and Thermostat with Extended Addressing 7 of 13 Figure 3. O.S. Output Operation Example Co

Strany 12 - Writing to the DS75LX

DS75LX: Digital Thermometer and Thermostat with Extended Addressing 8 of 13 Table 2. Configuration Register Bit Descriptions BIT NAME DESCRIP

Strany 13 - 13 of 13

DS75LX: Digital Thermometer and Thermostat with Extended Addressing 9 of 13 Table 5. Pointer Definition REGISTER P1 P0 Temperature 0 0 Configur

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