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PDF DS620U Data sheet ( Hoja de datos )
| Número de pieza | DS620U | |
| Descripción | Low-Voltage/ 0.5C Accuracy Digital Thermometer and Thermostat | |
| Fabricantes | Dallas Semiconducotr | |
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www.maxim-ic.com
DS620
Low-Voltage, ±0.5°C Accuracy
Digital Thermometer and Thermostat
GENERAL DESCRIPTION
The DS620 digital thermometer and thermostat
provides low-voltage (1.7V £ VDD £ 3.5V) temperature
measurements with ±0.5°C accuracy from 0°C to
+70°C and an operating temperature range of -55°C
to +125°C. The DS620 communicates over a 2-wire
digital interface. For distributed-sensing applications,
it is multidroppable with three address pins that allow
up to eight DS620s to operate on a single bus.
The DS620 has thermostat functionality with user-
defined thresholds stored in EEPROM registers, and
it can be configured for standalone thermostat
operation. The programmable output (PO) pin serves
as the thermostat output, and this pin can also be
configured to function as an active-low control for
peripheral devices.
APPLICATIONS
Portable Applications
Low-Voltage Temperature-Sensitive Applications
Computers/Servers
Test Equipment
Medical Instruments
Industrial Applications
FEATURES
§ Low-Voltage Operation: 1.7V to 3.5V
§ ±0.5°C Accuracy from 0°C to +70°C
§ Operating Temperature Range: -55°C to +125°C
(-67°F to +257°F)
§ Temperature Measurements Require No
External Components
§ Resolution is User-Selectable to 10-, 11-, 12-, or
13-Bits (0.5°C, 0.25°C, 0.125°C, and 0.0625°C
LSb Weight, Respectively)
§ Multidroppable
§ Fast (200ms max) Temperature-to-Digital
Conversion Time
§ Thermostatic Settings are User-Definable and
Nonvolatile
§ Standalone Thermostat Capability
§ Data is Read/Written Through a 2-Wire Serial
Interface
§ Package: 8-Pin mSOP
ORDERING INFORMATION
PART
TEMP RANGE PIN-PACKAGE
DS620U
-55°C to +125°C
8 µSOP,
Exposed Pad
8 µSOP
DS620U/T&R
-55°C to +125°C Exposed Pad
Tape-and-Reel
TYPICAL OPERATING CIRCUIT
PIN CONFIGURATION
1.7V to 3.5V
1.7V to 3.5V
SDA
SCL
HOST
VDD
SDA
SCL
PO
DS620
A0
A1
A2
GND
Thermostat
DS620
SDA 1
8 VDD
SCL 2
7 A0
PO 3
6 A1
GND 4
5 A2
8-Pin mSOP Package
Exposed Pad
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.
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081004
1 page  
Figure 2. Timing Diagram
DS620 Digital Thermometer and Thermostat
Table 1. Register Summary
Parameter
TH and TL Registers
Size: 2-Bytes
Note that the 3 LSbs are always “don’t cares” for writes
(i.e., they are not saved) and always read out as 0s.
Configuration Register
Size: 2-Bytes
Temperature Register
Size: 2-Bytes
Information
EEPROM
Factory State:
TH = 15ºC (0000 0111 1000 0000) [0780h]
TL = 10ºC (0000 0101 0000 0000) [0500h]
SRAM and EEPROM. See Figure 4 and Table 5 for
detailed information and power-up/factory state.
SRAM Power-Up State: -60ºC
(1110 0010 0000 0000) [E200h]
TEMPERATURE MEASUREMENT
The DS620 measures temperature using a bandgap-based temperature sensor. A delta-sigma, analog-to-digital
converter (ADC) converts measured temperature to a 10-, 11-, 12-, or 13-bit (user-selectable) digital value that is
calibrated in °C; for °F applications, a lookup table or conversion routine must be used. Throughout this data sheet,
the term “conversion” is used to refer to the entire temperature measurement and ADC sequence.
The DS620 can be configured to power up either automatically converting temperature or in a low-power standby
state. The preferred power-up mode can be set using the AUTOC bit in the configuration register as explained in
the Configuration Register section of this data sheet.
The DS620 can be programmed to perform continuous consecutive conversions (continuous conversion mode) or
to perform single conversions on command (one-shot mode). The conversion mode is programmed through the
1SHOT bit in the configuration register as explained in the Configuration Register section of this data sheet. In
continuous conversion mode, conversions are performed after a Start Convert command is issued (or upon power-
up if the AUTOC bit in the configuration register is set to 1) until a Stop Convert command is issued, at which time
the device goes into a low-power standby state. Continuous conversions can be restarted at any time using the
Start Convert command. In one-shot mode, the DS620 performs a single temperature conversion either at power-
up (if AUTOC = 1) or when a Start Convert command is issued (if AUTOC = 0). When the conversion is complete,
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DS620 Digital Thermometer and Thermostat
is acting as a receiver, it uses a NACK instead of an ACK after the last data byte to indicate that it is finished
receiving data. The master indicates a NACK by leaving the SDA line high during the ACK clock cycle.
Slave Address: Every slave device on the bus has a unique 7-bit address that allows the master to access that
device. The DS620’s 7-bit bus address is 1 0 0 1 A2 A1 A0, where A2, A1, and A0 are user-selectable via the
corresponding input pins. The three address pins allow up to eight DS620s to be multidropped on the same bus.
Control Byte: The control byte is transmitted by the master and consists of the 7-bit slave address plus a
read/write (R/¯W¯) bit (see Figure 7). If the master is going to read data from the slave device then R/¯W¯ = 1, and if
the master is going to write data to the slave device then R/¯W¯ = 0.
Address Byte: The address byte is used by the master to tell the DS620 which address location in the memory
map in Table 4 is going to be accessed during communication or which command should be performed. See
Command Set section.
Figure 6. START, STOP, AND ACK SIGNALS
SDA
SCL
START
Condition
…
…
ACK (or NACK) STOP
From Receiver Condition
Figure 7. Control Byte
bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0
1 0 0 1 A2 A1 A0 R/¯W¯
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 each SCL period.
§ A pullup resistor is required on the SDA line and, when the bus is idle, both SDA and SCL must remain in a logic-
high state.
§ All bus communication must be initiated with a START condition and terminated with a STOP condition. During a
START or STOP is the only time SDA is allowed to change states while SCL is high. At all other times, changes
on the SDA line can only occur when SCL is low: SDA must remain stable when SCL is high.
§ After every 8-bit (1-byte) transfer, the receiving device must answer with an ACK (or NACK), which takes one
SCL period. Therefore, nine clocks are required for every one-byte data transfer.
INITIATING 2-WIRE COMMUNICATION
To initiate 2-wire communication, the master generates a START followed by a control byte containing the DS620
slave address. The R/W bit of the control byte must be a 0 (write) since the master next writes a command byte or
an address byte. The DS620 responds with an ACK after receiving the control byte. This must be followed by a
command byte from the master which indicates what type of command operation is to be performed, or an address
byte when the master intends to write to or read from the DS620. The DS620 again responds with an ACK after
receiving the command or address byte. The master can then issue a STOP to signal the end of the
communication sequence, or continue writing to the address memory. See the Command Set section for details on
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