参数资料
| 型号： | ADT7462ZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 43/82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 28 provides a brief description of each parameter.
Table 28. T MIN CONTROL LOOP PARAMETERS
Operating Point Registers
Register 0x5A, Remote 1 Operating Point = 0xA4
(100 ? C Default)
Parameter
T LOW
T HIGH
T MIN
Operating
Point
T THERM
T RANGE
Description
If the temperature drops below the T LOW limit,
an error flag is set in a status register and an
SMBALERT interrupt can be generated.
If the temperature exceeds the T HIGH limit, an
error flag is set in a status register and an
SMBALERT interrupt can be generated.
The temperature at which the fan turns on
under automatic fan speed control.
The maximum target temperature for a
particular temperature zone. The system
attempts to maintain system temperature
around the operating point by adjusting the
T MIN parameter of the control loop.
If the temperature exceeds this critical limit, the
fans can be run at 100% for maximum cooling.
Programs the PWM duty cycle vs. temperature
control slope.
Register 0x5B, Remote 2 Operating Point = 0xA4
(100 ? C Default)
Operating Point Hysteresis Register
The operating point hysteresis register sets the value
below the operating point at which T MIN begins to reduce.
Register 0x64, Bits [7:4] Operating Point Hysteresis = 0x40
(4 ? C Default)
Step 9 ? High and Low Limits for Temperature
Channels
The low limit defines the temperature at which the T MIN
value starts to be increased, if temperature falls below this
value. This has the net effect of reducing the fan speed,
allowing the system to get hotter. An interrupt can be
generated when the temperature drops below the low limit.
The high limit should be set above the operating point but
Dynamic T MIN Control Programming
Because the dynamic T MIN control mode is a basic
extension of the automatic fan control mode, the automatic
fan control mode parameters should be programmed first
(see Step 1 ? Configuring the MUX through Step 8 ?
Operating Points for Temperature Channels). Then proceed
with dynamic T MIN control mode programming.
Step 8 ? Operating Points for Temperature Channels
The operating point for each temperature channel is the
optimal temperature for that thermal zone. The hotter each
zone is allowed to be, the quieter the system, because the fans
are not required to run as fast. The ADT7462 increases or
decreases fan speeds as necessary to maintain the operating
point temperature, allowing for system-to-system variation
and removing the need for worst-case design. If a sensible
operating point value is chosen, any T MIN value can be
selected in the system characterization. If the T MIN value is
too low, the fans run sooner than required, and the
temperature is below the operating point. In response, the
ADT7462 increases T MIN to keep the fans off longer and to
allow the temperature zone to get closer to the operating
point. Likewise, too high a T MIN value causes the operating
point to be exceeded, and in turn, the ADT7462 reduces T MIN
to turn the fans on sooner to cool the system.
Programming the Operating Point Registers
There are two operating point registers, one for the
Remote 1 temperature channel and one for the Remote 2
below the critical THERM point. An interrupt can be
generated when the temperature rises above the high limit.
How Dynamic T MIN Control Works
The basic operation of dynamic T MIN control is as
follows:
1. Set the target temperature for the temperature
zone, which could be, for example, the Remote 1
thermal diode. This value is programmed to the
Remote 1 operating point register.
2. As the temperature in that zone rises toward and
exceeds the operating point temperature minus
hysteresis, T MIN is reduced and fan speed
increases.
3. As the temperature drops below the low limit
value, T MIN is increased and the fan speed is
reduced.
Short Cycle and Long Cycle
The ADT7462 implements two loops: a short (or
decrease) cycle and a long (or increase) cycle. The short
cycle takes place every n monitoring cycles. The long cycle
takes place every 2n monitoring cycles. The value of n is
programmable for each temperature channel. The bits are
located at the following register locations.
Dynamic T MIN Control Register 2 (0x0C)
Bits [2:0] (CYR1) = Remote 1
Bits [5:3] (CYR2) = Remote 2
temperature channel. These 8-bit registers allow the
operating point temperatures to be programmed with 1 ? C
resolution.
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