EMC2302 datasheet(30/70 Pages) MICROCHIP

30 / 70 page

EMC2301/2/3/5

DS20006532A-page 30

 2021 Microchip Technology Inc.

6.3

Fan Status Register

The Fan Status register indicates that the fan driver has

stalled or failed or that the Watchdog Timer has expired

(see Section 4.11 “Watchdog Timer”).

6.4

Fan Stall Status Register

The Fan Stall Status register indicates which fan driver

has detected a stalled condition (see Section 4.4.3

“Stalled Fan”). All bits are cleared upon a read if the

Error condition has been removed.

FAN STATUS - FAN STATUS REGISTER (ADDRESS 24H)

RC-0

U-0

RC-0

WATCH

—

DVFAIL

FNSPIN

FNSTL

bit 7

bit 0

Legend:

RC = Read-then-clear bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7

WATCH: Indicates that the Watchdog Timer has expired. When this bit is set, each fan is driven to

100% duty cycle and will remain at 100% duty cycle until they are programmed. This bit is cleared

when it is read.

1 = Watchdog Timer has expired.

0 = Watchdog Timer has not expired.

bit 6-3

Unimplemented bits, read as ‘0’.

bit 2

DVFAIL: Indicates that one or more fan drivers cannot meet the programmed fan speed at maximum

PWM duty cycle.

1 = Any bit in the Fan Drive Fail Status register (Register 6-5) is set

0 = All bits in Fan Drive Fail Status register are cleared.

bit 1

FNSPIN: Indicates that one or more fan drivers cannot spin up.

1 = This bit is set when any bit in the Fan Spin Status register (Register 6-4) is set.

0 = All bits in the Fan Spin Status register are cleared.

bit 0

FNSTL: Indicates that one or more fan drivers have stalled.

1 = Any bit in the Fan Stall Status register (Register 6-3) is set.

0 = All bits in the Fan Stall register are cleared.

FAN STALL STATUS - FAN STALL STATUS REGISTER (ADDRESS 25H)

U-0

RC-0

—

F5STL

F4STL

F3STL

F2STL

F1STL

bit 7

bit 0

Legend:

RC = Read-then-clear bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7-5

Unimplemented bits, read as ‘0’.

bit 4

F5STL: Fan 5 Stall Status

1 = Fan 5 tachometer count has exceeded maximum valid TACH count, indicating stall.

0 = Fan 5 Stall has not been detected.

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