Rainbow Electronics DS7505 - Manual

General Description
The DS7505 low-voltage (1.7V to 3.7V) digital ther-
mometer and thermostat provides 9-, 10-, 11-, or 12-bit
digital temperature readings over a -55°C to +125°C
range with
±0.5°C accuracy over a -0°C to +70°C range.
A 9-bit resolution mode is software compatible with the
LM75. Communication with the DS7505 is achieved
through a simple 2-wire serial interface. Three address
pins allow up to eight DS7505 devices to operate on the
same 2-wire bus, which greatly simplifies distributed
temperature-sensing applications.
The DS7505 thermostat has a dedicated open-drain out-
put (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 ) that are stored in EEPROM registers.
Applications
Networking Equipment
Cellular Base Stations
Office Equipment
Medical Equipment
Any Thermally Sensitive System
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)
♦ ±0.5°C Accuracy Over a 0°C to +70°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 and
Nonvolatile (NV)
♦ Stand-Alone Thermostat Capability
♦ Data Read/Write Occurs Through a 2-Wire Serial
Interface (SDA and SCL Pins)
♦ Data Lines Filtered Internally for Noise Immunity
(50ns Deglitch)
♦ Optional 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 SO and µMAX
® Packages
DS7505
Digital Thermometer and Thermostat
________________________________________________________________ Maxim Integrated Products 1
SO
TOP VIEW
2 7 A0 SCL
1 8 VDD SDA
A1 O.S. 3 6
A2 GND 4 5
DS7505
μMAX
2 7 A0 SCL
1 8 VDD SDA
A1 O.S. 3 6
A2 GND 4 5
DS7505
Pin Configurations
Ordering Information
Rev 1; 3/08
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
PART TEMP RANGE PIN-PACKAGE
DS7505S+ -55°C to +125°C 8 SO (150 mils)
DS7505S+T&R -55°C to +125°C
8 SO (150 mils),
2500-Piece T&R
DS7505U+ -55°C to +125°C 8 μMAX
DS7505U+T&R -55°C to +125°C
8 μMAX,
3000-Piece T&R
+ Denotes a lead-free package.
T&R = Tape and reel.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Commands are capitalized for clarity.