TC72-3.3MUATR datasheet(15/28 Pages) MICROCHIP

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DS21743B-page 15

TC72

5.0

INTERNAL REGISTER

STRUCTURE

TC72 registers are listed below.

TABLE 5-1:

REGISTERS FOR TC72

5.1

Control Register

The Control register is both a read and a write register

that is used to select either the Shutdown, Continuous

or One-Shot Conversion operating mode. The Temper-

ature Conversion mode selection logic is shown in

Table 5-2. The Shutdown (SHDN) bit is stored in bit 0

of the Control register. If SHDN is equal to ‘1’, TC72 will

go into power-saving Shutdown mode. If SHDN is

equal to ‘0’, TC72 will perform a temperature

conversion approximately every 150 ms.

At power-up, the SHDN bit is set to ‘1’. Thus, TC72 is

in Shutdown operating mode at startup. Continuous

Temperature Conversion mode is selected by writing a

‘0’ to the SHDN bit of the Control register.

Shutdown mode can be used to minimize the power

consumption

TC72

when

active

temperature

monitoring is not required. The Shutdown mode

disables

the

temperature

conversion

circuitry;

however, the serial I/O communication port remains

active. A temperature conversion will be initialized by a

Write operation to the Control register to select either

the Continuous Temperature Conversion or the One-

Shot operating mode. The temperature data will be

available in the MSB and LSB Temperature registers

approximately 150 ms after the Control register Write

operation.

One-Shot mode is selected by writing a ‘1’ into bit 4 of

the Control register. The One-Shot mode performs a

single temperature measurement and returns to the

power-saving Shutdown mode. After completion of the

temperature conversion, the One-Shot bit (OS) is reset

to ‘0’ (i.e. “OFF”). The user must set the One-Shot bit

to ‘1’ to initiate another temperature conversion.

Bits 1, 3, 5, 6 and 7 of the Control register are not used

by TC72. Bit 2 is set to a logic ‘1’. Any write operation

to these bit locations will have no affect on the

operation of TC72.

5.2

Temperature Register

The Temperature register is a read-only register and

contains a 10-bit two’s complement representation of

the temperature measurement. Bit 0 through Bit 5 of

the LSB Temperature register are always set to a logic

‘0’.

At Power-On Reset (POR) or a Brown-Out Reset

(BOR) low voltage occurrence, the temperature regis-

ter is reset to all zeroes, which corresponds to a tem-

perature value of 0°C. A VDD power supply less than

1.6V is considered a reset event and will reset the

Temperature register to the power-up state.

5.3

Manufacturer ID Register

The Manufacturer Identification (ID) register is a read-

only register used to identify the temperature sensor as

a Microchip component.

TABLE 5-2:

CONTROL REGISTER TEMPERATURE CONVERSION MODE SELECTION

Read

Address

Write

Address

Bit

Value on

POR/BOR

Control

00hex

80hex

One-Shot

(OS)

Shutdown

(SHDN)

05hex

LSB Temperature

01hex

N/A

00hex

MSB Temperature

02hex

N/A

T5 T4 T3

00hex

Manufacturer ID

03hex

N/A

54hex

Operational Mode

One-Shot (OS) Bit 4

Shutdown (SHDN) Bit 0

Continuous Temperature Conversion

Shutdown

Continuous Temperature Conversion

(One-Shot Command is ignored if SHDN = ‘0’)

One-Shot

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