Rainbow-electronics DS7505 Manual de usuario

Busca en linea o descarga Manual de usuario para Sensores Rainbow-electronics DS7505. Rainbow Electronics DS7505 User Manual Manual de usuario

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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
27A0SCL
1 8 VDDSDA
A1O.S. 3 6
A2GND
45
DS7505
μ
MAX
27A0SCL
1 8 VDDSDA
A1O.S. 3 6
A2GND 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.
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Indice de contenidos

Pagina 1 - Ordering Information

General DescriptionThe DS7505 low-voltage (1.7V to 3.7V) digital ther-mometer and thermostat provides 9-, 10-, 11-, or 12-bitdigital temperature readi

Pagina 2 - AC ELECTRICAL CHARACTERISTICS

DS7505Slave Address: Every slave device on the bus has aunique 7-bit address that allows the master to accessthat device. The DS7505’s 7-bit bus addre

Pagina 3

General 2-Wire Information• All data is transmitted MSB first over the 2-wire bus.• One bit of data is transmitted on the 2-wire bus eachSCL period.•

Pagina 4 - Pin Description

DS7505Copy Data [48h] 0100 1000Copies data from all SRAM shadow registers to EEPROM. It is recommended that a Copy Data com-mand be performed after wr

Pagina 5 - Temperature

DS7505Digital Thermometer and Thermostat______________________________________________________________________________________ 13Package Information(F

Pagina 6 - Thermostat

DS7505Digital Thermometer and ThermostatMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim

Pagina 7 - Interrupt Mode

DS7505Digital Thermometer and Thermostat2 _______________________________________________________________________________________ABSOLUTE MAXIMUM RATI

Pagina 8 - Configuration Register

DS7505Digital Thermometer and Thermostat_______________________________________________________________________________________ 3Note 1: All voltages

Pagina 9 - 2-Wire Serial Data Bus

DS7505Digital Thermometer and Thermostat4 _______________________________________________________________________________________Pin DescriptionPIN NA

Pagina 10 - Figure 8. Pointer Byte

DS7505Digital Thermometer and Thermostat_______________________________________________________________________________________ 5 Bit 15 Bit 1

Pagina 11 - Command Set

DS7505Shutdown ModeFor power-sensitive applications, the DS7505 offers alow-power shutdown mode. The SD bit in the configura-tion register controls sh

Pagina 12

DS7505Digital Thermometer and Thermostat_______________________________________________________________________________________ 7IN THIS EXAMPLE, THE

Pagina 13 - Package Information

DS7505Configuration RegisterThe configuration register allows the user to programvarious DS7505 options such as conversion resolution,thermostat fault

Pagina 14 - Revision History

Register PointerThe four DS7505 registers each have a unique 2-bitpointer designation, which is defined in Table 5. Whenreading from or writing to the

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