ADT7518
Rev. A | Page 39 of 40
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.
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 devices 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
Figure 64. INT/
INT
Responds to
SMBALERT
ARA
MASTER
RECEIVES
SMBALERT
START
ALERT RESPONSE
ADDRESS
RD ACK
DEVICE
ADDRESS
MASTER SENDS
ARA AND READ
COMMAND
DEVICE SENDS
ITS ADDRESS
DEVICE ACK
ACK PEC
NO
ACK
STOP
MASTE
ACK
MASTE
NACK
DEVICE SENDS
ITS PEC DATA
Figure 65. INT/INT
Responds to SMBALERT
ARA
With Packet Error Checking (PEC)
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
AT30TS00-MAH-T
SENSOR DGTL TEMP I2C/SMBUS 8WDFN
AT30TSE002B-MAH-T
SENSOR DGTL TEMP I2C/SMBUS 8WDFN
BD3504FVM-TR
IC REG CTRLR SGL POS ADJ 8MSOP
BD3521FVM-TR
IC REG CTRLR SGL 1.5V MSOP8
BD9153MUV-E2
IC REG TRPL BCK/LINEAR 24VQFN
CAT2300VP2-GT3
IC SENSE FET CONTROLLER 8TDFN
CAT34TS02VP2GT4A
IC TEMP SENSOR 2K MEMORY 8TDFN
CAT6095VP2-GT4
IC TEMP SENSOR STAND ALONE 8TDFN
相关代理商/技术参数
ADT7518ARQZ-REEL
制造商:Analog Devices 功能描述:Temp Sensor Analog Serial (4-Wire, SPI, I2C) 16-Pin QSOP T/R
ADT7518ARQZ-REEL7
制造商:Analog Devices 功能描述:Temp Sensor Analog Serial (4-Wire, SPI, I2C) 16-Pin QSOP T/R
ADT7519
制造商:AD 制造商全称:Analog Devices 功能描述:SPI-/I2C-Compatible, Temperature Sensor,4-Channel ADC and Quad Voltage Output
ADT7519ARQ
制造商:Analog Devices 功能描述:Temp Sensor Digital Serial (4-Wire, SPI, I2C) 16-Pin QSOP
ADT7519ARQ-REEL
制造商:Analog Devices 功能描述:Temp Sensor Digital Serial (4-Wire, SPI, I2C) 16-Pin QSOP T/R
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
ADT7519ARQZ
功能描述:IC TEMP SNSR QUAD DAC 16-QSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热管理 系列:- 标准包装:3,000 系列:- 功能:温度开关 传感器类型:内部 感应温度:85°C 分界点 精确度:±6°C（最小值） 拓扑:ADC（三角积分型），比较器，寄存器库 输出类型:开路漏极 输出警报:是 输出风扇:是 电源电压:2.7 V ~ 5.5 V 工作温度:-55°C ~ 125°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:带卷 (TR) 其它名称:ADT6501SRJZP085RL7-ND
ADT7519ARQZ1
制造商:AD 制造商全称:Analog Devices 功能描述:SPI/I2C Compatible, Temperature Sensor, Four Channel ADC and Quad Voltage Output DAC