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參數(shù)資料
| 型號： | ADT7518ARQZ-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | SPI/I2C Compatible, Temperature Sensor, 4-Channel ADC and Quad Voltage Output DAC |
| 中文描述： | DIGITAL TEMP SENSOR-SERIAL, 10BIT(s), 5Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | LEAD FREE, MO-137-AB, QSOP-16 |
| 文件頁數(shù)： | 39/40頁 |
| 文件大?。?/td> | 1217K |
| 代理商： | ADT7518ARQZ-REEL |
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ADT7518
The INT/INT output can operate as an SMBALERT function.
Slave devices on the SMBus cannot normally signal to the
master that they want to talk, but the SMBALERT function
allows them to do so. SMBALERT is used in conjunction with
the SMBus general call address.
Rev. A | Page 39 of 40
One or more INT/INT outputs can be connected to a com-
mon SMBALERT line connected to the master. When the
SMBALERT line is pulled low by one of the devices, the
following procedure occurs, as shown in Figure 64.
1.
SMBALERT pulled low.
2.
Master initiates a read operation and sends the alert res-
ponse address (ARA = 0001 100). This is a general call
address that must not be used as a specific device address.
3.
The devices whose INT/INT output is low responds to the
alert response address and the master reads its device
address. As the device address is seven bits long, an LSB of
1 is added. The address of the device is now known and it
can be interrogated in the usual way.
4.
If more than one device’s INT/INT output is low, the one
with the lowest device address will have priority in accor-
dance with normal SMBus specifications.
5.
Once the ADT7518 has responded to the alert response
address, it will reset its INT/INT output, provided that the
condition that caused the out-of-limit event no longer
exists and that the status register associated with the out-
of-limit event is read. If the SMBALERT line remains low,
the master will send the ARA again. It will continue to do
this until all devices whose SMBALERT outputs were low
have responded.
MASTER
RECEIVES
SMBALERT
START
ALERT RESPONSE
ADDRESS
RD ACK DEVICE ADDRESS
MASTER SENDS
ARA AND READ
COMMAND
DEVICE SENDS
ITS ADDRESS
NO
ACK
STOP
0
Figure 64. INT/INT Responds to SMBALERT ARA
MASTER
RECEIVES
START
ALEADDRESS
RD ACK
DEVICE
ARA AND READ
COMMAND
DEVICE SENDS
ITS ADDRESS
DEVICE ACK
ACK
PEC
NO
STOP
MACK
NACK
DEVICE SENDS
ITS PEC DATA
0
Figure 65. INT/INT Responds to SMBALERT ARA
With Packet Error Checking (PEC)
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| ADT7518ARQZ-REEL7 | 制造商:Analog Devices 功能描述:Temp Sensor Analog Serial (4-Wire, SPI, I2C) 16-Pin QSOP T/R |
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| ADT7519ARQ | 制造商:Analog Devices 功能描述:Temp Sensor Digital Serial (4-Wire, SPI, I2C) 16-Pin QSOP |
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| ADT7519ARQ-REEL7 | 制造商:Analog Devices 功能描述:Temp Sensor Digital Serial (4-Wire, SPI, I2C) 16-Pin QSOP T/R 制造商:Analog Devices 功能描述:TEMP SENSOR DGTL SERL (4-WIRE, SPI) 16QSOP - Tape and Reel |
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