ADT7411ARQZ10 데이터 시트보기 (PDF) - Analog Devices

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ADT7411ARQZ10

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

Analog Devices 

ADT7411

The measured results from the temperature sensors are com-

pared with the internal and external, THIGH, TLOW, limits. These

temperature limits are stored in on-chip registers. If the temp-

erature 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 will cause 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 guar-

anteed 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, i.e., 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. The new

S/W RESET

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 Config-

uration 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 will start again

immediately after the serial communication has finished. The

temperature measurement proceeds normally as described

previously.

INTERRUPT

STATUS

REGISTER 1

(TEMP AND

AIN1 TO AIN4)

WATCHDOG

LIMIT

COMPARISONS

INTERRUPT

STATUS

REGISTER 2

(VDD AND

AIN5 TO AIN8)

INTERNAL

TEMP

EXTERNAL

TEMP

INTERRUPT

MASK

REGISTERS

VDD

DIODE

FAULT

AIN1–AIN4

READ RESET

CONTROL

CONFIGURATION

REGISTER 1

AIN5–AIN8

INT/INT

ENABLE BIT

Figure 27. ADT7411 Interrupt Structure

INT/INT

(LATCHED OUTPUT)

Rev. A | Page 16 of 36

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