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PDF AT30TS750 Data sheet ( Hoja de datos )
| Número de pieza | AT30TS750 | |
| Descripción | Digital Temperature Sensor | |
| Fabricantes | ATMEL Corporation | |
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Atmel AT30TS750
9- to 12-bit Selectable, ±0.5°C Accurate
Digital Temperature Sensor with Nonvolatile Registers
DATASHEET
See Applicable Errata in Section 15.
Features
Single 2.7V - 5.5V supply
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
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
ALERT output pin for indicating temperature alarms
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
Built-in noise suppression filtering for clock and data input signals
Low power dissipation
75μA active current (typical) during temperature measurements
Shutdown mode to minimize power consumption
1μA shutdown current (typical)
One-shot mode for single temperature measurement while in Shutdown mode
Pin and software compatible to industry-standard LM75-type devices
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)
8749C–DTS–6/12
1 page  
2. Pin Descriptions and Pinouts
Table 1. Pin Description
Symbol Name and Function
Asserted
State
Type
SCL Serial Clock: This pin is used to provide a clock to the device and is used to control
the flow of data to and from the device. Command and input data present on the SDA
pin is always latched in on the rising edge of SCL, while output data on the SDA pin is
always clocked out on the falling edge of SCL.
The SCL pin must either be forced high when the serial bus is idle or pulled-high using
an external pull-up resistor.
—
Input
SDA
Serial Data: The SDA pin is an open-drain bidirectional input/output pin used to
serially transfer data to and from the device.
The SDA pin must be pulled-high using an external pull-up resistor and may be
wire-ANDed with any number of other open-drain or open-collector pins from other
devices on the same bus.
— Input/Output
ALERT
Alert: The ALERT pin is an open-drain output pin used to indicate when the
temperature goes beyond the user-programmed temperature limits. The ALERT pin
can be operated in one of two different modes (Interrupt or Comparator mode) as
defined by the CMP/INT bit in the Configuration Register. The ALERT pin defaults to
an active-low output upon device power-up or reset but can be reconfigured as an
active-high output by setting the POL bit in the Configuration Register.
This pin can be wire-ANDed together with ALERT pins from other devices on the same
bus. When wire-ANDing pins together, the ALERT pin should be configured as an
active-low output so that when a single ALERT pin on the common alert bus goes
active, the entire common alert bus will go low and the host controller will be properly
notified since other ALERT pins that may be in the inactive-high state will not mask the
true alert signal. In an SMBus environment, the SMBus host can respond by sending
an SMBus ARA (Alert Response Address) command to determine which device on the
SMBus generated the alert signal.
The ALERT pin must be pulled-high using an external pull-up resistor even when it is
not used. Care must also be taken to prevent this pin from being shorted directly to
ground without a resistor at any time whether during testing or normal operation.
—
Output
A2-0 Address Inputs: The A2-0 pins are used to select the device address and correspond
to the three least-significant bits (LSBs) of the I2C/SMBus 7-bit slave address. These
pins can be directly connected in any combination to VCC or GND, and by utilizing the
A2-0 pins, up to eight devices may be addressed on a single bus.
—
The A2-0 pins are internally pulled to GND and may be left floating. However, it is
highly recommended that the A2-0 pins always be directly connected to VCC or GND to
ensure a known address state.
Input
VCC Device Power Supply: The VCC pin is used to supply the source voltage to the device.
Operations at invalid VCC voltages may produce spurious results and should not be
attempted.
—
Power
GND
Ground: The ground reference for the power supply. GND should be connected to the
system ground.
—
Power
Atmel AT30TS750 [DATASHEET]
8749C–DTS–6/12
5
5 Page 
5.2.2
Comparator Mode
When the device operates in the Comparator mode, then the ALERT pin goes active if the measured temperature meets
or exceeds the high temperature limit set by the THIGH Limit Register and a valid fault condition exists (the consecutive
number of temperature faults has been reached). The ALERT pin will return to the inactive state after the measured
temperature drops below the TLOW Limit Register value the appropriate number of times to create a subsequent valid
fault condition. The ALERT pin only changes state based on the high and low temperature limits and fault conditions;
reading from or writing to any register or putting the device into Shutdown mode will not affect the state of the ALERT pin.
The high temperature limit set by the THIGH Limit Register must be greater than the low temperature limit set by the TLOW
Limit Register in order for the ALERT pin to activate correctly.
If switching from Interrupt mode to Comparator mode while the ALERT pin is already active, then the ALERT pin will
remain active until the measured temperature is below the TLOW Limit Register value the appropriate number of times to
create a valid fault condition.
The ALERT pin will return to the inactive state if the device receives the General Call Reset command. When reset, the
contents of the Nonvolatile Configuration Register will be copied into the Configuration Register; therefore, the device
may or may not return to the Comparator mode depending on the setting of the NVCMP/INT bit in the Nonvolatile
Configuration Register.
Figure 5-2 illustrates both the active high and active low ALERT pin response for a sample temperature profile with the
device configured for the Comparator mode and a fault tolerance queue setting of two.
Figure 5-2. Comparator Mode (Fault Tolerance Queue = 2)
THIGH Limit
Temperature
TLOW Limit
ALERT
(Active High, POL = 1)
ALERT
(Active Low, POL = 0)
Temperature Measurements/Conversions
Atmel AT30TS750 [DATASHEET]
8749C–DTS–6/12
11
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