|
|
PDF AT30TS74 Data sheet ( Hoja de datos )
| Número de pieza | AT30TS74 | |
| Descripción | Digital Temperature Sensor | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de AT30TS74 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
|
No Preview Available !
AT30TS74
9- to 12-bit Selectable, ±1.0°C Accurate
Digital Temperature Sensor
PRELIMINARY DATASHEET
Features
Single 1.7V to 5.5V Supply
Measures Temperature From -55C to +125C
Highly Accurate Temperature Measurements Requiring No External
Components
̶ ±1.0C Accuracy (Typical) Over the -20C to +100C Range
̶ ±1.0C Accuracy (Typical) Over the -10C to +100C Range (WLCSP Only)
̶ ±2.0C 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
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
I2C High-Speed (HS) Mode Compatible
̶ 3.4MHz Maximum Clock Frequency
Built-in noise Suppression Filtering for Clock and Data Input Signals
Low-power Dissipation
̶ 85μA 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 (150mil)
̶ 8-lead MSOP (3.0 x 3.0mm)
̶ 8-pad Ultra Thin DFN (UDFN — 2.0 x 3.0 x 0.6mm)
̶ 4-ball WLCSP
Atmel-8897D-DTS-AT30TS74-Datasheet_102014
1 page  
1. Pin Descriptions and Pinouts
Table 1. Pin Description
Symbol Name and Function
Asserted
State
Type
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
SCL 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
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,
A2-0
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 the A2-0 pins always be directly connected to VCC or GND to
ensure a known address state.
For the 4-ball WLCSP offering, see Section 4.1 for additional information.
Input
Device Power Supply: The VCC pin is used to supply the source voltage to the
device.
VCC 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
AT30TS74 [PRELIMINARY DATASHEET]
Atmel-8897D-DTS-AT30TS74-Datasheet_102014
5
5 Page 
4.3 Temperature Measurements
The AT30TS74 utilizes a band-gap type temperature sensor with an internal sigma-delta Analog-to-Digital
Converter (ADC) to measure and convert the temperature reading into a digital value with a selectable
resolution as high as 0.0625C. The measured temperature is calibrated in degrees Celsius; therefore, a lookup
table or conversion routine is necessary for applications that wish to deal in degrees Fahrenheit.
The result of the digitized temperature measurements are stored in the internal Temperature Register of the
AT30TS74, which is readable at any time through the device's serial interface. When in the normal operating
mode, the device performs continuous temperature measurements and updates the contents of the
Temperature Register (see Section 5.2, “Temperature Register”) after each analog-to-digital conversion.
The resolution of the temperature measurement data can be configured to 9, 10, 11, or 12 bits which corresponds
to temperature increments of 0.5C, 0.25C, 0.125C, and 0.0625C, respectively. Selecting the temperature
resolution is done using the R1 and R0 bits in the Configuration Register (see Section 5.3, “Configuration
Register”). The ADC conversion time does increase with each bit of higher resolution, so careful consideration
should be given to the resolution versus conversion time relationship. The default resolution after device
power-up or reset is nine bits, which retains backwards compatibility to industry-standard LM75-type devices.
With 12 bits of resolution, the AT30TS74 can theoretically measure a temperature range of 255C (-128C to
+127C); however, the device is only designed to measure temperatures over a range of -55C to +125C.
4.4 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 4.4.1, “Fault Tolerance
Limits”), 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 ALERT pin defaults to the active low state after device power-up or reset but can be reconfigured
to active high by setting the POL bit in the Configuration Register to a Logic 1. The function of the ALERT pin
changes based on the Alarm Thermostat mode, which can be configured to either Comparator mode (see
Section 4.4.2, “Comparator Mode”) or Interrupt mode (see Section 4.4.3, “Interrupt Mode”) by using the
CMP/INT bit in the Configuration Register. The Comparator mode is the default operating mode after the device
powers up or resets.
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.
4.4.1
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.
AT30TS74 [PRELIMINARY DATASHEET]
Atmel-8897D-DTS-AT30TS74-Datasheet_102014
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AT30TS74.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| AT30TS74 | Digital Temperature Sensor | ATMEL Corporation |
| AT30TS75 | Digital Temperature Sensor | ATMEL Corporation |
| AT30TS750 | Digital Temperature Sensor | ATMEL Corporation |
| AT30TS750A | Digital Temperature Sensor | ATMEL Corporation |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |