AT30TS750MA8T datasheet(9/50 Pages) ATMEL

Part #	AT30TS750MA8T

Description	9- to 12-bit Selectable, 짹0.5째C Accurate Digital Temperature Sensor with Nonvolatile Registers

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Manufacturer	ATMEL [ATMEL Corporation]

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Atmel AT30TS750 [DATASHEET]

8749C–DTS–6/12

5.

Device Operation

Commands used to configure and control the operation of the AT30TS750 are sent to the device from the Master via the

serial interface. Likewise, the Master can read the temperature data from the AT30TS750 via the serial interface.

However, since multiple slave devices can reside on the serial bus, each slave device must have its own unique 7-bit

address so that the Master can access each device independently.

For the AT30TS750, the first four MSBs of its 7-bit address are the device type identifier and are fixed at 1001. The

remaining three LSBs correspond to the states of the hard-wired A2-0 address pins.

Example:

If the A2-0 pins are connected to GND, then the 7-bit device address would be 1001000.

In order for the Master to select and access the AT30TS750, the Master must first initiate a Start condition. Following the

Start condition, the Master must output the device address byte. The device address byte consists of the 7-bit device

address plus a Read/Write (R/W) control bit, which indicates whether the Master will be performing a Read or a Write to

the AT30TS750. If the R/W control bit is a Logic 1, then the Master will be reading data from the AT30TS750.

Alternatively, if the R/W control bit is a Logic 0, then the Master will be writing data to the AT30TS750.

Table 5-1.

Atmel AT30TS750 Address Byte

If the 7-bit address sent by the Master matches that of the AT30TS750, then the device will respond with an ACK after it

has received the full address byte. If there is an address mismatch, then the AT30TS750 will respond with a NACK and

return to the idle state.

5.1

Temperature Measurements

The AT30TS750 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

0.0625

C. 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 AT30TS750,

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 6.2

“Temperature Register” on page 16) 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 0.5

C, 0.25C, 0.125C, and 0.0625C, respectively. Selecting the temperature resolution is

done by setting the R1 and R0 bits in the Configuration Register (see Section 6.3 “Configuration Register” on page 18).

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 resolution after device power-up or reset will revert to what was

previously selected using the NVR1 and NVR0 bits of the Nonvolatile Configuration Register bits prior to when the device

was powered-down or reset.

With 12 bits of resolution, the AT30TS750 can theoretically measure a temperature range of 255

C (-128C to +127C);

however, the device is only designed to measure temperatures over a range of -55

C to +125C.

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Device Type Identifier

Device Address

Read/Write

1

0

1

A2

A1

A0

R/W

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