EVAL-ADT7411EBZ Analog Devices Inc, EVAL-ADT7411EBZ Datasheet - Page 34

• Manufacturer Part Number: EVAL-ADT7411EBZ
• Description: BOARD EVALUATION FOR ADT7411
• Manufacturer: Analog Devices Inc

Specifications of EVAL-ADT7411EBZ

• Sensor Type: Temperature
• Sensing Range: -40°C ~ 120°C
• Interface: DSP, I²C, MICROWIRE, QSPI, SMBus, SPI
• Sensitivity: ±0.5°C
• Voltage - Supply: 2.7 V ~ 5.5 V
• Embedded: No
• Utilized Ic / Part: ADT7411
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ADT7411
The INT/ INT output can operate as an SMBALERT function.
Slave devices on the SMBus can normally not 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 common
SMBALERT line connected to the master. When the
SMBALERT line is pulled low by one of the devices, the
procedure shown in Figure 42 occurs.
1.
2.
START
MASTER
RECEIVES
SMBALERT
SMBALERT is pulled low.
Master initiates a read operation and sends the alert
response address (ARA = 0001 100). This is a general call
address that must not be used as a specific device address.
ALERT RESPONSE
Figure 42. INT/ INT Responds to SMBALERT ARA
MASTER SENDS
ARA AND READ
COMMAND
DOUT
SCLK
ADDRESS
DIN
SPI
CS
CS
START
D7
X
RD ACK DEVICE ADDRESS
1
D6
X
READ OPERATION
DEVICE SENDS
ITS ADDRESS
D5
X
Figure 40. SPI—Reading Two Bytes of Data from Two Sequential Registers
READ COMMAND
D4
Figure 41. SPI—Correct Use of CS During SPI Communications
X
DOUT (CONTINUED)
SCLK (CONTINUED)
DIN (CONTINUED)
D3
CS (CONTINUED)
X
ACK STOP
NO
D2
X
D1
X
Rev. B | Page 34 of 36
D0
X
8
D7
X
D7
X
1
1
3.
4.
5.
Figure 43. INT/ INT Responds to SMBALERT ARA with Packet Error Checking
D6
X
D6
X
START ALERT RESPONSE
MASTER
RECEIVES
SMBALERT
The device 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.
If more than one device’s INT/ INT output is low, the one
with the lowest device address has priority, in accordance
with normal SMBus specifications.
Once the ADT7411 responds to the alert response address,
it resets its INT/ INT output, provided that the condition
that caused the out-of-limit event no longer exists and the
status register associated with the out-of-limit event is read.
If the SMBALERT line remains low, the master sends the
ARA again. It continues to do this until all devices whose
SMBALERT outputs were low have responded.
D5
D5
X
X
MASTER SENDS
ARA AND READ
COMMAND
DATA BYTE 1
ADDRESS
D4
D4
X
DATA BYTE 2
WRITE OPERATION
X
D3
D3
X
X
D2
X
D2
RD ACK
X
DEVICE ACK
D1
D1
X
X
DEVICE SENDS
ITS ADDRESS
ADDRESS
DEVICE
D0
D0
X
X
8
8
STOP
MASTER
ACK
ACK
DEVICE SENDS
ITS PEC DATA
PEC
MASTER
NACK
ACK
NO
STOP