ADT7461AR-REEL7 ON Semiconductor, ADT7461AR-REEL7 Datasheet - Page 14

• Manufacturer Part Number: ADT7461AR-REEL7
• Description: IC SENSOR TEMP 2-CH 8SOIC
• Manufacturer: ON Semiconductor

Specifications of ADT7461AR-REEL7

• Rohs Status: RoHS non-compliant
• 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 ~ 5.5 V
• Operating Temperature: -40°C ~ 120°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)

ADT7461
Table 10. Sample Offset Register Codes
Offset Value
−128°C
−4°C
−1°C
−0.25°C
0°C
+0.25°C
+1°C
+4°C
+127.75°C
One-Shot Register
The one-shot register is used to initiate a conversion and
comparison cycle when the ADT7461 is in standby mode, after
which the device returns to standby. Writing to the one-shot
register address (0x0F) causes the ADT7461 to perform a
conversion and comparison on both the internal and the
external temperature channels. This is not a data register as
such; the write operation to Address 0x0F causes the one-shot
conversion. The data written to this address is irrelevant and is
not stored.
Table 12. List of Registers
Read Address (Hex)
Not applicable
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
Not applicable
0x10
0x11
0x12
0x13
0x14
0x19
0x20
0x21
0x22
0xFE
0xFF
1
Writing to Address 0x0F causes the ADT7461 to perform a single measurement. It is not a data register; therefore, data written to it is irrelevant.
0x11
1000 0000
1111 1100
1111 1111
1111 1111
0000 0000
0000 0000
0000 0001
0000 0100
0111 1111
Write Address (Hex)
Not applicable
Not applicable
Not applicable
Not applicable
0x09
0x0A
0x0B
0x0C
0x0D
0x0E
0x0F
Not applicable
0x11
0x12
0x13
0x14
0x19
0x20
0x21
0x22
Not applicable
Not applicable
1
0x12
00 00 0000
00 00 0000
00 000000
10 00 0000
00 00 0000
01 00 0000
00 00 0000
00 00 0000
11 00 0000
Rev. 3 | Page 14 of 23 | www.onsemi.com
Name
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
Address Pointer
Consecutive ALERT Register
The value written to this register determines how many out-of-
limit measurements must occur before an ALERT is generated.
The default value is that one out-of-limit measurement
generates an ALERT. The maximum value that can be chosen is
4. The purpose of this register is to allow the user to perform
some filtering of the output. This is particularly useful at the
fastest three conversion rates, where no averaging takes place.
This register is at Address 0x22.
Table 11. Consecutive ALERT Register Bit
Register Value
yxxx 000x
yxxx 001x
yxxx 011x
yxxx 111x
1
2
x = don’t care bit.
y = SMBus timeout bit; default = 0. See the Serial Bus Interface section.
1, 2
Number of Out-of-Limit
Measurements Required
1
2
3
4
Power-On Default
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
0110 1100 (0x55) (85°C)
0101 0101 (0x55) (85°C)
0000 1010 (0x0A) (10°C)
0000 0001 (0x01)
0100 0001 (0x41)
0101 0001 (0x51)