ADM1029ARQZ-R7 datasheet(36/50 Pages) ONSEMI

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Rev. 1 | Page 36 of 50 | www.onsemi.com

* Status (Power-On Default 0000 0?0?)

Bit

Name

R/W

Description

Missing = x

Reflects the state of Pins 4/21. Low means Fan x

* is installed, High

means it is missing. This bit will automatically return Low if a missing

fan is replaced.

Missing _L = 0

R/W

This bit is edge-triggered and latches a Fan x

* missing event on removal

of Fan x. This bit is cleared by writing a 0 to it.

Fault_ = x

Inverse of Pin 2/23. Low on pin means Fan x

* has a fault (Pins 2/23

Low), High on pin means it is OK. This bit will automatically return

Low if Pins 2/23 goes high.

Fault_L_ = 0

R/W

This bit is edge-triggered and latches a Fan x

* fault event on Pins 2/23.

This bit is cleared by writing a 0 to it. If the PRESENT pin for a fan

input is high (fan not installed) this bit will be cleared automatically.

Sleep = 0

R/W

When this bit is set, Fan x

* will be stopped and no Fan x* faults will be

monitored. If Bit 4 in Fan x

* Fault Action Register is set, Fan x* will go

to Alarm Speed if an overtemperature event is detected as per settings in

the Temp Fault Action Registers.

Hot Plug Priority

R/W

This bit indicates whether Fan x runs at Hot-Plug Speed (bit set to 1) or

Alarm Speed (bit set to 0) if both modes are triggered.

Tach_Fault_L

R/W

Latches a Fan x Tach Fault. This bit is cleared by writing a 0 to it. If the

PRESENT pin for a fan input is high (fan not installed), this bit will be

cleared automatically.

Hot_Plug_L

R/W

This bit is edge-triggered and latches a Fan x Hot-plug event which is the

insertion of Fan x. (Note difference to Bit 1.) This bit is cleared by writ-

ing a 0 to it. If a fan is Hot-Plug installed, it will run at Normal Speed.

NOTES

*“x” denotes the fan number. Register 10h is for Fan 1 and Register 11h is for Fan 2.

Question marks on this and following pages indicate bit settings that depend on the state of certain pins on power-up.

ADM1029

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