ADT7481ARMZ-1RL ON Semiconductor, ADT7481ARMZ-1RL Datasheet - Page 14

• Manufacturer Part Number: ADT7481ARMZ-1RL
• Description: IC SENSOR TEMP 2CH ALARM 10MSOP
• Manufacturer: ON Semiconductor

Specifications of ADT7481ARMZ-1RL

• Function: Temp Monitoring System (Sensor)
• Topology: ADC, Comparator, Multiplexer, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: -40°C ~ 120°C, External Sensor
• Output Type: SMBus™
• Output Alarm: Yes
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 120°C
• Mounting Type: Surface Mount
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ADT7481ARMZ-1REEL; ADT7481ARMZ-1REEL

a stop condition. In read mode, the master device will
override the acknowledge bit by pulling the data line high
during the low period before the ninth clock pulse. This is
known as no acknowledge. The master will then take the
data line low during the low period before the tenth clock
pulse, then high during the tenth clock pulse to assert a stop
condition.
serial bus in one operation, but it is not possible to mix read
and write in one operation because the type of operation is
determined at the beginning and cannot subsequently be
changed without starting a new operation. In the case of the
ADT7481, write operations contain either one or two bytes,
while read operations contain one byte.
Figure 15. Writing a Register Address to the Address Pointer Register, then Writing Data to the Selected Register
Any number of bytes of data may be transferred over the
SCL
SCL
SDA
SDA
SCL
SDA
START BY
START BY
MASTER
MASTER
START BY
MASTER
1
1
1
1
1
1
0
0
0
0
0
0
SERIAL BUS ADDRESS BYTE
SERIAL BUS ADDRESS BYTE
SERIAL BUS ADDRESS BYTE
Figure 16. Writing to the Address Pointer Register Only
Figure 17. Reading from a Previously Selected Register
1
FRAME 1 DATA
1
1
FRAME 1 DATA
FRAME 1 DATA
1
1
1
SDA (CONTINUED)
SCL (CONTINUED)
0
0
0
1
1
1
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R/W
R/W
R/W
ADT7481
ACK. BY
ADT7481
ACK. BY
ADT7481
ACK. BY
9
9
14
D7
9
1
data from it, the address pointer register must be set so that
the correct data register is addressed. The first byte of a write
operation always contains a valid address that is stored in the
address pointer register. If data is to be written to the device,
the write operation contains a second data byte that is written
to the register selected by the address pointer register.
address is sent over the bus followed by R/W set to 0 and
followed by two data bytes. The first data byte is the address
of the internal data register to be written to, which is stored
in the address pointer register. The second data byte is the
data to be written to the internal data register.
D7
D7
1
1
D7
To write data to one of the device data registers or to read
This procedure is illustrated in Figure 15. The device
D6
1
D6
D6
D6
D5
D5
D5
ADDRESS POINTER REGISTER BYTE
ADDRESS POINTER REGISTER BYTE
D5
D4
ADDRESS POINTER REGISTER BYTE
D4
D4
FRAME 3
DATA
BYTE
D4
D3
FRAME 2
FRAME 2
D3
D3
FRAME 2
D3
D2
D2
D2
D2
D1
D1
D1
D1
D0
D0
D0
ADT7481
ACK. BY
D0
9
ADT7481
ACK. BY
ADT7481
ACK. BY
9
9
ADT7481
ACK. BY
STOP BY
9
MASTER
STOP BY
MASTER
STOP BY
MASTER