7411(2017) 데이터 시트보기 (PDF) - Analog Devices

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7411
(Rev.:2017)

SPI-/I2C-Compatible, 10-Bit Digital Temperature Sensor and 8-Channel ADC

Analog Devices 

ADT7411

The measured results from the temperature sensors are

compared with the internal and external THIGH and TLOW

limits. These temperature limits are stored in on-chip registers.

If the temperature limits are not masked out, any out-of-limit

comparisons generate flags that are stored in Interrupt Status 1

register. One or more out-of-limit results causes the INT/INT

output to pull either high or low, depending on the output

polarity setting.

Theoretically, the temperature measuring circuit can measure

temperatures from –128°C to +127°C with a resolution of

0.25°C. However, temperatures outside TA are outside the

guaranteed operating temperature range of the device.

Temperature measurement from –128°C to +127°C is

possible using an external sensor.

Temperature measurement is initiated by three methods. The

first method is applicable when the part is in single-channel

measurement mode. The temperature is measured 16 times and

internally averaged to reduce noise. In single-channel mode, the

part is continuously monitoring the selected channel, that is, as

soon as one measurement is taken, another one is started on the

same channel. The total time to measure a temperature channel

with the ADC operating at slow speed is typically 11.4 ms

(712 μs × 16) for the internal temperature sensor and 24.22 ms

(1.51 ms × 16) for the external temperature sensor.

S/W RESET

Data Sheet

The new temperature value is stored in two 8-bit registers and

ready for reading by the I2C or SPI interface. The user has the

option of disabling the averaging by setting Bit 5 in the Control

Configuration 2 register (Address 19h). The ADT7411

defaults on power-up with the averaging enabled.

The second method is applicable when the part is in round

robin measurement mode. The part measures both the internal

and external temperature sensors as it cycles through all possible

measurement channels. The two temperature channels are

measured each time the part runs a round robin sequence.

In round robin mode, the part is continuously measuring all

channels.

Temperature measurement is also initiated after every read

or write to the part when the part is in either single-channel

measurement mode or round robin measurement mode. Once

serial communication has started, any conversion in progress

is stopped and the ADC is reset. Conversion starts again

immediately after the serial communication has finished.

The temperature measurement proceeds normally as

previously described.

INTERRUPT

STATUS

REGISTER 1

(TEMP AND

AIN1 TO AIN4)

INTERNAL

TEMP

EXTERNAL

TEMP

WATCHDOG

LIMIT

COMPARISONS

INTERRUPT

STATUS

REGISTER 2

(VDD AND

AIN5 TO AIN8)

INTERRUPT

MASK

REGISTERS

VDD

DIODE

FAULT

AIN1 TO AIN4

READ RESET

AIN5 TO AIN8

CONTROL

CONFIGURATION

REGISTER 1

INT/INT

ENABLE BIT

Figure 27. ADT7411 Interrupt Structure

INT/INT

(LATCHED OUTPUT)

Rev. C | Page 16 of 36

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