Rainbow Electronics DS75LV - Manual

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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 DS75LV defaults to 9-bit resolution for
software compatibility with the LM75. Communication
with the DS75LV is achieved through a simple 2-wire
serial interface. Three address pins allow up to eight
DS75LV devices to operate on the same 2-wire bus,
which greatly simplifies distributed temperature-
sensing applications.
The DS75LV thermostat has a dedicated open-drain
output (O.S.) and programmable fault tolerance,
which allows 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
).
A block diagram of the DS75LV is shown in Figure 1
and detailed pin descriptions are given in Table 2.
APPLICATIONS
Personal Computers
Cellular Base Stations
Office Equipment
Any Thermally Sensitive System
PIN CONFIGURATION
FEATURES
§ Operating Range from 1.7V to 3.7V
§ Temperature Measurements Require No
External Components
§ Measures Temperatures from -55°C to +125°C
(-67°F to +257°F)
§ ±2°C Accuracy Over a -25°C to +100°C Range
§ 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 Read/Write Occurs Through a 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 mSOP (mMAX) and SO
Packages
ORDERING INFORMATION
PART TEMP RANGE PIN-PACKAGE
DS75LVS+ -55°C to +125°C
DS75LV
(150-mil) 8-SO
DS75LVS+T&R -55°C to +125°C
DS75LV
(150-mil) 8-SO,
2500 Piece
Tape-and-Reel
DS75LVU+ -55°C to +125°C
DS75LV
8-µSOP
(µMAX)
DS75LVU+T&R -55°C to +125°C
DS75LV
8-µSOP
(µMAX), 3000
Piece Tape-
and-Reel
Ordering Information continued at the end of the data sheet.
DS75LV
Digital Thermometer and Thermostat
www.maxim-ic.com
DS75LVU— mSOP/mMAX
SCL
V
DD
A
0
A
1
A
2
GND
O.S.
SDA
6
8
7
5
3
1
2
4
DS75L
DS75LVS—SO (150 mils)
SCL
V
DD
A
0
A
1
A
2
GND
O.S.
SDA
6
8
7
5
3
1
2
4
DS75L