Datasheet > ADM1027ARQZ-RL71

ADM1027ARQZ-RL71

更新时间： 2022-03-04 06:41:03

品牌	Logo	应用领域
安森美 - ONSEMI		监视器控制器
页数	文件大小	规格书
56页	1815K
描述
dBCOOLâ¢ Remote Thermal Controller and Voltage Monitor

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ADM1027ARQZ-RL71 数据手册

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ADM1027

Table XX. PWM Minimum Duty Cycle Registers

R/W

Description

Power-On Default

0x64

0x65

0x66

Read/Write

PWM1 Minimum Duty Cycle

PWM2 Minimum Duty Cycle

PWM3 Minimum Duty Cycle

0x80 (50% duty cycle)

Bit

Name

Read/Write

Description

<7:0>

PWM Duty

Read/Write

These bits define the PWM_MINduty cycle for the PWMx output.

0x00 = 0% duty cycle (fan off)

0x40 = 25% duty cycle

0x80 = 50% duty cycle

0xFF = 100% duty cycle (fan full speed)

These registers become read-only when the ADM1027 is in automatic fan control mode.

Table XXI. T_MINRegisters

R/W

Description

Power-On Default

0x67

0x68

0x69

Read/Write

Remote 1 Temperature T_MIN

Local Temperature T_MIN

Remote 2 Temperature T_MIN

0x5A (90^oC)

These are the T_MINregisters for each temperature channel. When the temperature measured exceeds T_MIN, the appropriate fan will

run at minimum speed and increase with temperature according to T_RANGE

These registers become read-only when the Configuration Register 1 lock bit is set. Any further attempts to write to these registers

will have no effect.

Table XXII. Therm Limit Registers

R/W

Description

Power-On Default

0x6A

0x6B

0x6C

Read/Write

Remote 1 THERM Limit

Local THERM Limit

Remote 2 THERM Limit

0x64 (100^oC)

If any temperature measured exceeds its THERM limit, all PWM outputs will 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 will remain at 100% until the

temperature drops below THERM limit – 4ꢀC .

These registers become read-only when the Configuration Register 1 lock bit is set to 1. Any further attempts to write to these registers

will have no effect.

Table XXIII. Temperature Hysteresis Registers

R/W

Description

Power-On Default

0x6D

0x6E

Read/Write

Remote 1, Local Temperature Hysteresis

Remote 2 Temperature Hysteresis

0x44

0x40

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_MINvalue, the fan will remain running at PWM_MINduty cycle until the temperature = T_MIN– hysteresis.

Up to 15^oC of hysteresis may be assigned to any temperature channel. Setting the hysteresis value lower than 4^oC will cause the fan

to switch on and off regularly when the temperature is close to T_MIN

These registers become read-only when the Configuration Register 1 lock bit is set to 1. Any further attempts to write to these registers

will have no effect.

Rev. 3 | Page 50 of 56 | www.onsemi.com

–50–

REV. A

1...47 48 495051 52 53...56

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