ADT7461AARMZ-2REEL ON Semiconductor, ADT7461AARMZ-2REEL Datasheet - Page 12

• Manufacturer Part Number: ADT7461AARMZ-2REEL
• Description: IC SENSOR TEMP DGTL 2CH 8-MSOP
• Manufacturer: ON Semiconductor

Specifications of ADT7461AARMZ-2REEL

• Function: Temp Monitoring System (Sensor)
• Topology: ADC, Comparator, Multiplexer, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: 0°C ~ 127°C, External Sensor
• Output Type: SMBus™
• Output Alarm: Yes
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

1. Writing to Address 0x0F causes the ADT7461A to perform a single measurement. It is not a data register, and it does not matter what data
Serial Bus Interface
The ADT7461A is connected to this bus as a slave device,
under the control of a master device.
this is enabled, the SMBus times out after typically 25 ms of
no activity. However, this feature is not enabled by default.
Bit 7 of the consecutive alert register (Address = 0x22)
should be set to enable it.
Addressing the Device
address, except for some devices that have extended 10−bit
addresses. When the master device sends a device address
over the bus, the slave device with that address responds.
The ADT7461Ais available with one device address, 0x4C
(1001 100b). An ADT7461A−2 is also available.
101b). This is to allow two ADT7461A devices on the same
bus, or if the default address conflicts with an existing device
on the SMBus. The serial bus protocol operates as follows:
Table 9. List of Registers
Read Address (Hex)
Control of the ADT7461A is carried out via the serial bus.
The ADT7461A has an SMBus timeout feature. When
In general, every SMBus device has a 7−bit device
The ADT7461A−2 has an SMBus address of 0x4D (1001
is written to it.
Not Applicable
Not Applicable
1. The master initiates a data transfer by establishing
a start condition, defined as a high−to−low
transition on SDATA, the serial data line, while
SCLK, the serial clock line, remains high. This
FE
FF
00
01
02
03
04
05
06
07
08
10
12
13
14
19
20
21
22
11
Write Address (Hex)
Not Applicable
Not Applicable
Not Applicable
Not Applicable
Not Applicable
Not Applicable
Not Applicable
0F (
Note 1)
0C
0D
09
0A
0B
0E
12
13
14
19
20
21
22
11
Address Pointer
Local Temperature Value
External Temperature Value High Byte
Status
Configuration
Conversion Rate
Local Temperature High Limit
Local Temperature Low Limit
External Temperature High Limit High Byte
External Temperature Low Limit High Byte
One−Shot
External Temperature Value Low Byte
External Temperature Offset High Byte
External Temperature Offset Low Byte
External Temperature High Limit Low Byte
External Temperature Low Limit Low Byte
External THERM Limit
Local THERM Limit
THERM Hysteresis
Consecutive ALERT
Manufacturer ID
Die Revision Code
http://onsemi.com
12
Name
2. Data is sent over the serial bus in a sequence of
indicates that an address/data stream follows. All
slave peripherals connected to the serial bus
respond to the start condition and shift in the next
eight bits, consisting of a 7−bit address (MSB first)
plus an R/W bit, which determines the direction of
the data transfer, that is, whether data is written to,
or read from, the slave device. The peripheral
whose address corresponds to the transmitted
address responds by pulling the data line low
during the low period before the ninth clock pulse,
known as the acknowledge bit. All other devices
on the bus remain idle while the selected device
waits for data to be read from or written to it. If the
R/W bit is a 0, the master writes to the slave
device. If the R/W bit is a 1, the master reads from
the slave device.
nine clock pulses, eight bits of data followed by an
acknowledge bit from the slave device. Transitions
on the data line must occur during the low period
of the clock signal and remain stable during the
high period, since a low−to−high transition when
the clock is high can be interpreted as a stop
signal. The number of data bytes that can be
Undefined
0000 0000 (0x00)
0000 0000 (0x00)
Undefined
0000 0000 (0x00)
0000 1000 (0x08)
0101 0101 (0x55) (85°C)
0000 0000 (0x00) (0°C)
0101 0101 (0x55) (85°C)
0000 0000 (0x00) (0°C)
0000 0000
0000 0000
0000 0000
0000 0000
0000 0000
0101 0101 (0x55) (85°C)
0101 0101 (0x55) (85°C)
0000 1010 (0x0A) (10°C)
0000 0001 (0x01)
0100 0001 (0x41)
0101 0111 (0x57)
Power−On Default