ADT7460ARQZ ON Semiconductor, ADT7460ARQZ Datasheet - Page 12

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ADT7460ARQZ

Manufacturer Part Number
ADT7460ARQZ
Description
IC REMOTE THRML/FAN CTRLR 16QSOP
Manufacturer
ON Semiconductor
Series
dBCool®r
Datasheets

Specifications of ADT7460ARQZ

Function
Fan Control, Temp Monitor
Topology
ADC, Comparator, Multiplexer, Register Bank
Sensor Type
External & Internal
Sensing Temperature
-40°C ~ 120°C, External Sensor
Output Type
SMBus™
Output Alarm
No
Output Fan
Yes
Voltage - Supply
3 V ~ 5.5 V
Operating Temperature
-40°C ~ 120°C
Mounting Type
Surface Mount
Package / Case
16-QSOP
Full Temp Accuracy
+/- 3 C
Digital Output - Bus Interface
Serial (3-Wire)
Maximum Operating Temperature
+ 120 C
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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to the address pointer register for a subsequent single−byte
read from the same address. This is illustrated in Figure 20.
after setting up the address, the master can assert a repeat
start condition immediately after the final ACK and carry
out a single−byte read without asserting an intermediate stop
condition.
Write Byte
and one data byte to the slave device as follows:
For the ADT7460, the send byte protocol is used to write
If it is required to read data from the register immediately
In this operation, the master device sends a command byte
This is illustrated in Figure 21.
1. The master device asserts a start condition on SDA.
2. The master sends the 7−bit slave address followed
3. The addressed slave device asserts ACK on SDA.
4. The master sends the register address.
5. The slave asserts ACK on SDA.
6. The master sends a data byte.
7. The slave asserts ACK on SDA.
8. The master asserts a stop condition on SDA to end
Figure 21. Single−Byte Write to a Register
Figure 20. Setting a Register Address for
by the write bit (low).
the transaction.
SDA
SDA
SCL
SCL
S
1
START BY
START BY
MASTER
MASTER
ADDRESS W A
SLAVE
S
1
2
ADDRESS
SLAVE
Subsequent Read
2
1
0
1
0
3
W A
REGISTER
ADDRESS
10
10
3
Figure 19. Reading Data from a Previously Selected Register
4
REGISTER
ADDRESS
Figure 18. Writing to the Address Pointer Register Only
SERIAL BUS ADDRESS
SERIAL BUS ADDRESS
4
A
5
1
1
FRAME 1
FRAME 1
DATA
BYTE
BYTE
A P
5 6
6
1
1
7 8
A P
A1
A1
http://onsemi.com
A0
A0
ADT7460
R/W
R/
W
ADT7460
ADT7460
ACK. BY
ACK. BY
12
9
9
Read Operations
Receive Byte
The register address needs to have been set up previously. In
this operation, the master device receives a single byte from
a slave device as follows:
a single byte of data from a register whose address has
previously been set by a send byte or by write byte operation.
Alert Response Address
devices that allows an interrupting device to identify itself
to the host when multiple devices exist on the same bus.
output or can be used as an SMBALERT. One or more
outputs can be connected to a common SMBALERT line
connected to the master. If a device’s SMBALERT line goes
low, the following occurs:
The ADT7460 uses the following SMBus read protocols.
This is useful when repeatedly reading a single register.
In the ADT7460, the receive byte protocol is used to read
Alert response address (ARA) is a feature of SMBus
The SMBALERT output can be used as an interrupt
D7
D7
1
1
1. The master device asserts a start condition on SDA.
2. The master sends the 7−bit slave address followed
3. The addressed slave device asserts ACK on SDA.
4. The master receives a data byte.
5. The master asserts NO ACK on SDA.
6. The master asserts a stop condition on SDA and
1. SMBALERT is pulled low.
Figure 22. Single−Byte Read from a Register
by the read bit (high).
the transaction ends.
D6
D6
ADDRESS POINTER REGISTER BYTE
D5
D5
DATA BYTE FROM ADT7460
S
1
ADDRESS
D4
D4
SLAVE
2
FRAME 2
FRAME 2
D3
D3
R
3
A
D2
D2
DATA
4
D1
D1
A P
5 6
D0
D0
NO ACK. BY
MASTER
ADT7460
ACK. BY
9
9
STOP BY
STOP BY
MASTER
MASTER

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