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PDF AT30TSE752 Data sheet ( Hoja de datos )
| Número de pieza | AT30TSE752 | |
| Descripción | Digital Temperature Sensor | |
| Fabricantes | ATMEL Corporation | |
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Atmel AT30TSE752, AT30TSE754, AT30TSE758
9- to 12-bit Selectable, ±0.5°C Accurate
Digital Temperature Sensor with Nonvolatile Registers
and Serial EEPROM
Features
DATASHEET
See Applicable Errata in Section 16.
Integrated Temperature Sensor + Nonvolatile Registers + Serial EEPROM
2-Wire I2C and SMBus™ compatible serial interface
Supports SMBus Timeout
Supports SMBus Alert and Alert Response Address (ARA)
Selectable addressing allows up to eight devices on the same bus
Single 2.7V - 5.5V supply
100KHz and 400KHz compatibility
Industry standard green (Pb/Halide-free/RoHS compliant) package options
8-lead SOIC (150-mil)
8-lead MSOP (3 x 3mm)
8-pad Ultra Thin DFN (UDFN - 2 x 3 x 0.6mm)
Digital Temperature Sensor Features
Measures temperature from -55C to +125C
Highly accurate temperature measurements requiring no external components
±0.5°C accuracy (typical) over the 0C to +85C range
±1.0°C accuracy (typical) over the -25C to +105C range
±2.0°C accuracy (typical) over the -40C to +125C range
Pin and software compatible to industry-standard LM75-type devices
User-configurable resolution
9 to 12 bits (0.5C to 0.0625C)
User-configurable high and low temperature limits
Nonvolatile registers to retain user-configured or pre-defined power-up defaults
Register locking to prevent erroneous misconfiguration
Register lockdown for permanent, non-changeable device configuration
One-shot mode for single temperature measurement while in Shutdown mode
ALERT output pin for indicating temperature alarms
Low power dissipation
75μA active current (typical) during temperature measurements
Shutdown mode to minimize power consumption
1μA active current (typical)
8751D–DTS–8/2012
1 page  
1. Description
The Atmel® AT30TSE752/754/758 are a complete, precise temperature monitoring device designed for use in a variety
of applications that require the measuring of local temperatures as an integral part of the system's function and/or
reliability. The AT30TSE752/754/758 devices combine a high-precision digital temperature sensor, programmable high
and low temperature alarms, and a 2-wire I2C and SMBus (System Management Bus) compatible serial interface into a
single, compact package.
The temperature sensor can measure temperatures over the full -55°C to +125°C temperature range and has a typical
accuracy as precise as ±0.5°C from 0°C to +85°C. The result of the digitized temperature measurements are stored in
one of the AT30TSE752/754/758's internal registers, which is readable at any time through the device's serial interface.
The AT30TSE752/754/758 utilizes flexible, user-programmable internal registers to configure the temperature sensor's
performance and response to high and low temperature conditions. The device also contains a set of Nonvolatile
Registers to retain the configuration and temperature limit settings even after the device has been power cycled, thereby
eliminating the need for the device to be reconfigured after each Power-up operation. This additional flexibility permits
the device to run self-contained and not rely upon a host controller for device configuration.
In addition, the AT30TSE752/754/758 contain a 2-Kbit, 4-Kbit, or 8-Kbit Serial EEPROM that can be used to store vital
user system configuration and preference data. This additional feature permits the device to replace an existing
2-wire I2C Serial EEPROM in an application saving board space and component cost.
A dedicated alarm output activates if the temperature measurement exceeds the user-defined temperature and fault
count limits. To reduce current consumption and save power, the AT30TSE752/754/758 features a Shutdown mode that
turns off all internal circuitry except for the internal Power-On Reset (POR) and serial interface circuits. The device can
also be configured to power-up in the Shutdown mode to ensure that the device remains in a low-power state until the
user wishes to perform temperature measurements.
The AT30TSE752/754/758 are factory-calibrated and requires no external components to measure temperature. With
it’s flexibility and high-degree of accuracy, the AT30TSE752/754/758 are ideal for extended temperature measurements
in a wide variety of communication, computer, consumer, environmental, industrial, and instrumentation applications.
Atmel AT30TSE752/754/758 [DATASHEET]
8751D–DTS–8/2012
5
5 Page 
5.2 Temperature Alarm
After the measured temperature value has been stored into the Temperature Register, the data will be compared with
both the high and low temperature limits defined by the values stored in the THIGH Limit Register and TLOW Limit Register.
If the comparison results in a valid fault condition (see Section 5.2.1 “Fault Tolerance Limits” on page 11), then the device
will activate the ALERT output pin.
The polarity and function of the ALERT pin can be configured by using specific bits in the Configuration Register. The
polarity of the ALERT pin is controlled by the POL bit in the Configuration Register while the function of the ALERT pin
changes based on the Alarm Thermostat mode, which can be configured to either Comparator mode (see Section 5.2.2
“Comparator Mode” on page 12) or Interrupt mode (see Section 5.2.3 “Interrupt Mode” on page 13) by using the
CMP/INT bit in the Configuration Register. After the device powers up or resets, the NVPOL and NVCMP/INT bits of the
Nonvolatile Configuration Register are automatically copied into the POL and CMP/INT bits of the Configuration
Register; therefore, the ALERT pin polarity and function will revert back to the settings defined by the NVPOL and
NVCMP/INT bits prior to when the device was powered-down or reset.
The value of the high temperature limit stored in the THIGH Limit Register must be greater than the value of the low
temperature limit stored in the TLOW Limit Register in order for the ALERT function to work properly; otherwise, the
ALERT pin will output erroneous results and will falsely signal temperature alarms.
5.2.1
Fault Tolerance Limits
A temperature fault occurs if the measured temperature meets or exceeds either the high temperature limit set by the
THIGH Limit Register or the low temperature limit set by the TLOW Limit Register. To prevent false alarms due to
environmental or temperature noise, the device incorporates a fault tolerance queue that requires consecutive
temperature faults to occur before resulting in a valid fault condition. The fault tolerance queue value is controlled by the
FT1 and FT0 bits in the Configuration Register and can be set to a single fault count of 1 or a count of 2, 4, or 6
consecutive faults.
An internal counter that automatically increments after a temperature fault is used to determine if the fault tolerance
queue setting has been met. After incrementing the fault counter, the device will compare the count to the fault tolerance
queue setting to see if a valid fault condition should be triggered. Once a valid fault condition occurs, the device will
activate the ALERT output pin. If the most recent measured temperature does not meet or exceed the high or low
temperature limit, then the internal fault counter will be reset back to zero.
Figure 5-1 shows a sample temperature profile and how each temperature fault would impact the internal fault counter.
Figure 5-1. Fault Count Example
THIGH Limit
Temperature
TLOW Limit
Temperature Measurements/Conversions
After the device powers up or resets, the NVFT1 and NVFT0 bits of the Nonvolatile Configuration Register are
automatically copied into the FT1 and FT0 bits of the Configuration Register. Therefore, the Fault Tolerance Queue
setting will revert back to the settings defined by the NVFT1 and NVFT0 bits prior to when the device was powered-down
or reset.
Atmel AT30TSE752/754/758 [DATASHEET]
8751D–DTS–8/2012
11
11 Page | ||
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| PDF Descargar | [ Datasheet AT30TSE752.PDF ] | |
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