参数资料
| 型号： | ADT7462ZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 21/82页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR ADT7462 |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi |
| 标准包装： | 1 |
| 类型： | 温度传感器 |
| 适用于相关产品： | ADT7462 |
| 所含物品： | 评估板 |
| 其它名称： | EVAL-ADT7462EBZ EVAL-ADT7462EBZ-ND |
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ADT7462
Table 14. TEMPERATURE LIMIT REGISTERS
Register
Temperature Value Address
Local Low Temperature Limit 0x44
Remote 1 Low Temperature Limit 0x45
Remote 2 Low Temperature Limit 0x46
Default
0x40
0x40
0x40
? Place the ADT7462 as close as possible to the remote
sensing diode. Provided that the worst noise sources,
such as clock generators, data/address buses, and CRTs,
are avoided, this distance can be 4 inches to 8 inches.
? Route the D+ and D ? tracks close together, in parallel,
with grounded guard tracks on each side. To minimize
inductance and reduce noise pickup, a 5 mil track width
Remote 3 Low Temperature Limit
Local High Temperature Limit
0x47
0x48
0x40
0x95
and spacing is recommended. If possible, provide a
ground plane under the tracks.
Remote 1 High Temperature Limit
Remote 2 High Temperature Limit
Remote 3 High Temperature Limit
Local THERM1 Temperature Limit
Remote 1 THERM1 Temperature Limit
Remote 2 THERM1 Temperature Limit
Remote 3 THERM1 Temperature Limit
Local THERM2 Temperature Limit
0x49
0x4A
0x4B
0x4C
0x4D
0x4E
0x4F
0x50
0x95
0x95
0x95
0xA4
0xA4
0xA4
0xA4
0xA4
GND
D+
D ?
GND
5 MIL
5 MIL
5 MIL
5 MIL
5 MIL
5 MIL
5 MIL
Remote 1 THERM2 Temperature Limit
Remote 2 THERM2 Temperature Limit
Remote 3 THERM2 Temperature Limit
0x51
0x52
0x53
0xA4
0xA4
0xA4
Figure 34. Typical Arrangement of Signal Tracks
? Minimize the number of copper/solder joints that can
cause thermo-couple effects. Where copper/solder
Offset Registers
The ADT7462 has temperature offset registers at Register
0x56 to Register 0x59 for the local, Remote 1, Remote 2, and
Remote 3 temperature channels. By doing a one-time
calibration of the system, the user can determine the offset
caused by system board noise and cancel it using the offset
registers. The offset registers automatically add a twos
complement, 8-bit reading to every temperature
measurement. The LSBs add 0.5 ? C offset to the temperature
reading so the 8-bit register effectively allows temperature
offsets of up to ? 64 ? C with a resolution of 0.5 ? C. This ensures
that the readings in the temperature measurement registers are
as accurate as possible.
Temperature Offset Registers
Register 0x56 Local Temperature Offset = 0x00
(0 ? C Default)
Register 0x57 Remote 1 Temperature Offset = 0x00
(0 ? C Default)
Register 0x58 Remote 2 Temperature Offset = 0x00
(0 ? C Default)
Register 0x59 Remote 3 Temperature Offset = 0x00
(0 ? C Default)
Layout Considerations
Digital boards can be electrically noisy environments.
The ADT7462 measures very small voltages from the
remote sensor, so care must be taken to minimize noise
induced at the sensor inputs. The following precautions
should be taken:
?
?
?
?
?
joints are used, make sure that they are in both the D+
and D ? path and at the same temperature.
Thermocouple effects should not be a major problem
because 1 ? C corresponds to about 200 mV, and
thermocouple voltages are about 3 mV/ ? C of
temperature difference. Unless there are two
thermocouples with a large temperature differential
between them, thermocouple voltages should be much
less than 200 mV.
Place a 0.1 m F bypass capacitor close to the V CC pin. In
extremely noisy environments, an input filter capacitor
can be placed across D+ and D ? close to the ADT7462.
This capacitance can affect the temperature
measurement, so care must be taken to ensure that any
capacitance seen at D+ and D ? is a maximum of
1000 pF. This maximum value includes the filter
capacitance, plus any cable or stray capacitance
between the pins and the sensor diode.
If the distance to the remote sensor is more than
8 inches, the use of twisted pair cable is recommended.
This works from about 6 feet up to 12 feet.
For really long distances (up to 100 feet), use shielded
twisted pair, such as Belden No. 8451 microphone
cable. Connect the twisted pair to D+ and D ? and the
shield to GND close to the ADT7462. Leave the remote
end of the shield unconnected to avoid ground loops.
Because the measurement technique uses switched
current sources, excessive cable or filter capacitance
can affect the measurement. When using long cables,
the filter capacitance can be reduced or removed.
http://onsemi.com
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