Functional temperature accuracy

23–0 ° C to 70 ° C ± 1 ° C (maximum) small SOT-23 packaging save space

- 40 ° C to to 150 ° C ± 2 ° C (maximum) shutdown mode can be at

temperature reading

Temperature resolution 0.03125 ° C

at 40 ° C to+ 150 ° C work throughout the range

SPI and micr line interface description

LM95071/LM95071-Q1 is a low-power, high-power product-

]-Run 280 μA (typical)

-Disclosure 6 μA (typical)

LM95071-Q1 is AEC-Q100 level 0 qualified resolution digital temperature sensor, with SPI, compatible in automotive-grade micro-silk compatibility Made in the interface, which can be used in 5-stream needle SOT-23. The host can query LM95071/LM95071-Q1 to read the application temperature at any time. Its low -working current is a vital system in

low power consumption.

Automobile

System thermal management LM95071/LM95071-Q1 has 13 plus numbers

Temperature resolution (per LSB 0.03125 ° C), at the same time

Portable electronic equipment is 40 ° C to

Personal computer+150 ° C.

2.4V to 5.5V power supply of the disk driver LM95071/LM95071-Q1

Office electronic voltage range, fast conversion rate, low power supply

Electronic test equipment current and simple The SPI interface makes it

widely used.

Main specifications

Power supply voltage 2.4V to 5.5V

Power current

Temperature-Digital converter characteristics

Unless there are other Explanation, otherwise these specifications are suitable for VDD u003d 3.3V. The thickness limit is suitable for ta u003d tj u003d tmin to TMAX; all other limit ta u003d TJ u003d+25 ° C, unless there is another explanation.

Digital DC features

Unless otherwise explained, these specifications are applicable to VDD u003d 2.4 to 5.5V (1). TJ u003d TMIN to TMAX; all other limit ta u003d TJ u003d+25 ° C, unless there is another instructions.

(1) LM95071/LM95071-Q1 will work normally in the VDD power supply voltage range of 2.4V to 5.5V.

(2) The typical value is TA u003d 25 ° C, which represents the most likely parameter specifications.

(3) The limit is guaranteed to be AOQL (the average shipment quality level) of TI.

Serial bus digital switch feature

Unless otherwise explained, these specifications are applicable to VDD u003d 2.4V to 5.5V (1); Unless there are other regulations. Black body restrictions are suitable for TA u003d TJ u003d TMIN to TMAX; all other limit ta u003d TJ u003d+25 ° C, unless there is another explanation.

(1) LM95071/LM95071-Q1 will work normally in the VDD power supply voltage range of 2.4V to 5.5V.

(2) The typical value is TA u003d 25 ° C, which represents the most likely parameter specifications.

(3) The limit is guaranteed to be AOQL (the average shipment quality level) of TI.

function description

LM95071/LM95071-Q1 The temperature sensor contains one containing one Temperature sensor and 13-bit addition number Δ∑Adc (Delta-Sigma modulus converter). LM95071/LM95071-Q1 The compatibility of the three-line series and SPI and Microwire interface allows ordinary micro-controllers and processors. The shutdown mode can be used to optimize the current consumption of different applications. A manufacturer/device ID register identifies LM95071/LM95071-Q1 as Texas instrument products. Power-powered and power-off LM95071/LM95071-Q1 has always been powered on the known state and continuous conversion mode. After power-on, LM95071/LM95071-Q1 will immediately output an error code until the first temperature conversion has been completed. When the power supply voltage is lower than about 1.6V (typical values), the LM95071/LM95071-Q1 is considered to be a power-on lying down. When the power supply voltage rises to the nominal 1.6V power -powered threshold, the internal register is reset to the above -mentioned power supply default state.

Serial bus interface

LM95071/LM95071-Q1 as the running of the machine, compatible with the SPI or micr line bus. Data decreases along the upper clock in the serial clock (SC), and the data rises along the clock in the serial clock. A complete communication is composed of a decrease and rising chip selection (CS) signal. There should be at least one clock cycle between CS signal communication (The smallest 160 nan seconds) is high. Only transmitted communication (register read) consists of 16 clock cycles. The complete sending/receiving communication will be made by 32 serial clocks (see the sequential chart of the serial bus). The first 16 clocks include communication, and the second 16 clock is the receiving phase. When CS is high, Si/O is in three states. Communication should be started by reducing chip selection (CS). When SC changes from low state to high state, it should not be done. Once the CS is low, the serial I/O pin (Si/O) will transmit the first digit data. The host can then use SC's rising along this digit data to decrease by SC. During the transmission process, CS can take the high stage at any time. If the CS becomes lower during the conversion process, the LM95071/LM95071-Q1 will complete the conversion output shift register will be updated after the CS recovers high level. The receiving phase of communication begins after 16 SC cycles. CS can maintain a low level in 32 SC cycles. This LM95071/LM95071-Q1 will read the available data of the serial clock rising along the SI/O line on the top of the SI/O. Enter the data transmission to the 8 -bit displacement register. This part will detect the last eight -bit shift into the register. The receiving phase can maintain up to 16 SC cycles. All of this must be moved so that the parts can be placed in the state of stopping. All zero must be moved to place LM95071/LM95071-Q1 in a continuous conversion mode. Only the following code should be sent to LM95071/LM95071-Q1:

00 HEX for continuous conversion

Turn off FF HEX another code may put the part in the test mode. Texas Instrument Company used the test mode to thoroughly test the function of LM95071/LM95071-Q1 during production testing. Only 8 digits are defined because before the CS is high, the LM95071/LM95071-Q1 only detects the last eight transmission signals. The following communication can be used to determine the manufacturer/equipment ID, and then immediately place the parts into the continuous conversion mode. CS continues low:

Read 16 -bit temperature data

Write 16 -bit data command to close

Read 16 -bit manufacturer/device ID data

[123 ] Write 8 to 16 -bit data command conversion mode

Raise CS.

Note that before the actual use of LM95071/LM95071-Q1, the conversion must transmit temperature data through 228 milliseconds (maximum value).

Temperature data format

The temperature data is represented by a 14 -bit, and the two supplementary LSB (minimum effective position) is equal to 0.03125 degrees Celsius:

The first data bytes are the most effective bytes before and effective. Only allow it to be read to determine the temperature bar. For example, if the top 4 hosts of the temperature can immediately take measures to correct the temperature too high.

Shipping mode/Manufacturer ID

The main controller can enable the shutdown mode to reduce power consumption or is reading the manufacturer/equipment ID information. By writing XX FF HEX into LM95071/LM95071-Q1, as shown in Figure 13C. When LM95071/LM95071-Q1 was stopped. In the shutdown mode, LM95071/LM95071-Q1 will always output 1000 0000 0000 1111. This is the manufacturer/device ID information. The top 5 (1000 0xxx) of the field is the manufacturer ID.

Internal register structure

LM95071/LM95071-Q1 has three registers: temperature registers, configuration registers and manufacturers/equipment recognition registers. Temperature and manufacturer/equipment recognition register is read only. The configuration register is only written.

Configure the register

(select Ship or continuous conversion mode):

D0 -D15 is set to XX FF HEX to enable the shutdown mode.

D0 -D15 is set to XX 00 HEX and set to a continuous conversion mode.

Note: Set the D0-D15 to any other value may make LM95071/LM95071-Q1 into the manufacturer's test mode. In this case, LM95071/LM95071-Q1 will stop response, as mentioned. These test mode will be used for the production test of Texas instruments alone. For a complete serial interface, see the discussion of the serial bus.

D0 -D1: Logic 1 will be output on Si/0.

D2 – D15: Temperature data. One LSB u003d 0.03125 ° C. Two makeup formats.

D0 -D1: Logic 1 will be output on Si/0.

D2 -D15: Manufacturer/device ID data. Whenever LM95071/LM95071-Q1 is in the shutdown mode.

Precautions for the heat path

Use an integrated circuit temperature sensor such as LM95071/LM95071-Q1 to understand the sensor measurement of its own mold temperature. For LM95071/LM95071-Q1, the best heat path between the mold and the outside world is the pins of the LM95071/LM95071-Q1. In SOT-23 packaging, all pins on LM95071/LM95071-Q1 willIt has the same effect on the temperature of the mold. Because these pins represent a good thermal channel-Q1 mold to LM95071/LM95071, LM95071/LM95071-Q1 will provide precise measurement of printing circuit temperature. It is installed on it. In plastic packaging and LM95071/LM95071-Q1 mold. If the temperature air temperature is significantly different from the printing circuit board, it will have a small impact on the measured temperature.

Output consideration: High accuracy, good resolution, low noise LM95071/LM95071-Q1 is very suitable for applications that require strict temperature measurement accuracy. In many applications, from the process control to HVAC, low temperature errors mean better system performance and reduce production costs by eliminating system calibration steps. LM95071/LM95071-Q1 has good digital resolution, can perceive and report its internal tiny changing temperature, making it an ideal choice for temperature sensitivity. For example, LM95071/LM95071-Q1 enables the system to quickly identify the direction of temperature changes, so that the processor takes compensation measures before the system reaches the critical temperature. LM95071/LM95071-Q1 has a very low output noise (see Figure 9 in the typical performance part), which makes it an ideal choice to give priority to the application of stable thermal compensation. For example, in the application of temperature compensation oscillator, the tiny deviation in the continuous temperature reading is transformed into a stable frequency output of the oscillator.