EVAL-ADT7467EBZ ON Semiconductor, EVAL-ADT7467EBZ Datasheet - Page 71

• Manufacturer Part Number: EVAL-ADT7467EBZ
• Description: BOARD EVALUATION FOR ADT7467
• Manufacturer: ON Semiconductor
• Series: dBCool®r

Specifications of EVAL-ADT7467EBZ

• Sensor Type: Temperature
• Sensing Range: -40°C ~ 120°C
• Interface: SMBus (2-Wire/I²C)
• Sensitivity: ±1.5°C
• Voltage - Supply: 3 V ~ 5.5 V
• Embedded: No
• Utilized Ic / Part: ADT7467
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 41. T
Register Address
0x67
0x68
0x69
1
2
Table 42. THERM Temperature Limit Registers
Register Address
0x6A
0x6B
0x6C
1
2
Table 43. Temperature/T
Register Address
0x6D
0x6E
1
2
Table 44. Register 0x6D—Remote 1 and Local Temperature Hysteresis
Bit
<3:0>
<7:4>
1
Table 45. Register 0x6E—Remote 2 Temperature Hysteresis
Bit
<7:4>
1
Table 46. Register 0x6F—XNOR Tree Test Enable (Power-On Default = 0x00)
Bit
<0>
<7:1>
1
These are the T
with temperature according to T
These registers become read-only registers when the Configuration Register 1 LOCK bit is set to 1. Any subsequent attempts to write to these registers fail.
If any temperature measured exceeds its THERM limit, all PWM outputs drive their fans at 100% duty cycle. This is a fail-safe mechanism incorporated to cool the
system in the event of a critical overtemperature. It also ensures some level of cooling in the event that software or hardware locks up. If set to 0x80, this feature is
disabled. The PWM output remains at 100% until the temperature drops below THERM limit – hysteresis. If the THERM pin is programmed as an output, exceeding
these limits by 0.25°C can cause the THERM pin to assert low as an output.
These registers become read-only registers when the Configuration Register 1 LOCK bit is set to 1. Any subsequent attempts to write to these registers fail.
Each 4-bit value controls the amount of temperature hysteresis applied to a particular temperature channel. Once the temperature for that channel falls below its T
value, the fan remains running at PWM
The hysteresis value chosen also applies to that temperature channel if its THERM limit is exceeded. If the THERM limit is exceeded, the PWM output being controlled
goes to 100% and remains at 100% until the temperature drops below THERM – hysteresis. For acoustic reasons, it is recommended that the hysteresis value not be
programmed to less than 4°C. Setting the hysteresis value lower than 4°C causes the fan to switch on and off regularly when the temperature is close to T
These registers become read-only registers when the Configuration Register 1 LOCK bit is set to 1. Any subsequent attempts to write to these registers fail.
This register becomes a read-only register when the Configuration Register 1 LOCK bit is set to 1. Any subsequent attempts to write to this register fail.
This register becomes a read-only register when the Configuration Register 1 LOCK bit is set to 1. Any subsequent attempts to write to this register fail.
This register becomes a read-only register when the Configuration Register 1 LOCK bit is set to 1. Any subsequent attempts to write to this register fail.
Name
HYSL
HYSR1
Name
HYSR2
Name
XEN
Reserved
MIN
MIN
Registers
registers for each temperature channel. When the temperature measured exceeds T
R/W
Read/write
Read/write
R/W
Read/write
R/W
Read/write
Read only
1
1
1
1
MIN
RANGE
Hysteresis Registers
.
Description
Local temperature hysteresis. 0°C to 15°C of hysteresis can be applied to the local temperature AFC and dynamic
T
Remote 1 temperature hysteresis. 0°C to 15°C of hysteresis can be applied to the Remote 1 temperature AFC and
dynamic T
Description
Local temperature hysteresis. 0°C to 15°C of hysteresis can be applied to the local temperature AFC and dynamic
T
R/W
Read/write
Read/write
R/W
Read/write
Read/write
Read/write
R/W
Read/write
Read/write
Read/write
MIN
MIN
MIN
Description
If the XEN bit is set to 1, the device enters the XNOR tree test mode. Clearing the bit removes the device from
the XNOR tree test mode.
Unused. Do not write to these bits.
duty cycle until the temperature = T
control loops.
control loops.
2
2
2
MIN
control loops.
1
1
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Description
Remote 1 T
Local T
Remote 2 T
Description
Remote 1 THERM temperature limit.
Local THERM temperature limit.
Remote 2 THERM temperature limit.
Description
Remote 1 and local temperature hysteresis.
Remote 2 temperature hysteresis.
MIN
.
MIN
MIN
MIN
– hysteresis. Up to 15°C of hysteresis can be assigned to any temperature channel.
.
.
MIN
, the appropriate fan runs at minimum speed and increases
Power-On Default
0x9A (90°C)
0x9A (90°C)
0x9A (90°C)
Power-On Default
0xA4 (100°C)
0xA4 (100°C)
0xA4 (100°C)
Power-On Default
0x44
0x40
ADT7467
MIN
.
MIN