ADT7310 查看數據表（PDF） - Analog Devices

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ADT7310

±0.5°C Accurate, 16-Bit Digital SPI Temperature Sensor

Analog Devices 

ADT7310

CONTINUOUS READ MODE

When the command byte = 01010100 (0x54), the contents of

the temperature value register can be read out without requiring

repeated writes to the communications register. By sending 16

SCLK clocks to the ADT7310, the contents of the temperature

value register are output onto the DOUT pin.

To exit the continuous read mode, the Command Byte

01010000 (0x50) must be written to the ADT7310.

While in continuous read mode, the part monitors activity on

the DIN line so that it can receive the instruction to exit the

continuous read mode. Additionally, a reset occurs if 32

consecutive 1s are seen on the DIN pin. Therefore, hold DIN

low in continuous read mode until an instruction is to be

written to the device.

In continuous read mode, the temperature value register cannot

be read when a conversion is taking place. If an attempt is made

to read the temperature value register while a conversion is

taking place, then all 0s are read. This is because the continuous

read mode blocks read access to temperature value register

during a conversion.

CS

Data Sheet

SHUTDOWN

The ADT7310 can be placed in shutdown mode by writing 1

to Bit 6 and 1 to Bit 5 of the configuration register (Register

Address 0x01). The ADT7310 can be taken out of shutdown

mode by writing 0 to Bit 6 and 0 to Bit 5 of the configuration

register (Register Address 0x01). The ADT7310 typically takes

1 ms (with a 0.1 µF decoupling capacitor) to come out of shut-

down mode. The conversion result from the last conversion

prior to shutdown can still be read from the ADT7310 even

when it is in shutdown mode. When the part is taken out of

shutdown mode, the internal clock is started and a conversion

is initiated.

FAULT QUEUE

Bit 0 and Bit 1 of the configuration register (Register Address

0x01) are used to set up a fault queue. Up to four faults are

provided to prevent false tripping of the INT and CT pins

when the ADT7310 is used in a noisy temperature environ-

ment. The number of faults set in the queue must occur

consecutively to set the INT and CT outputs. For example,

if the number of faults set in the queue is four, then four

consecutive temperature conversions must occur, with each

result exceeding a temperature limit in any of the limit registers,

before the INT and CT pins are activated. If two consecutive

temperature conversions exceed a temperature limit and the

third conversion does not, the fault count is reset to zero.

DIN

DOUT

SCLK

0x54

TEMPERATURE

VALUE

TEMPERATURE

VALUE

TEMPERATURE

VALUE

Figure 16. Continuous Read Mode

Rev. A | Page 12 of 24

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