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EMC2302 데이터시트(PDF) 44 Page - Microchip Technology

부품명 EMC2302
상세설명  Single/Multiple RPM-Based PWM Fan Controller
PDF  70 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

EMC2302 데이터시트(HTML) 44 Page - Microchip Technology

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EMC2301/2/3/5
DS20006532A-page 44
 2021 Microchip Technology Inc.
6.21
Drive Fail Band Registers
The Drive Fail Band registers store the number of tach
counts used by the Fan Drive Fail detection circuitry.
This circuitry is activated when the fan drive setting
high byte is at FFh. When it is enabled, the actual mea-
sured fan speed is compared against the target fan
speed. These registers are only used when the FSC
algorithm is active.
This circuitry is used to indicate that the target fan
speed at full drive is higher than the fan is actually
capable of reaching. If the measured fan speed does
not exceed the target fan speed minus the Fan Drive
Fail Band register settings for a period of time longer
than set by the DFCx[1:0] bits, then the DRIVE_FAIL
status bit will be set and an interrupt generated (see
Section 4.4.4 “Aging Fan or Invalid Drive Detec-
tion”). The contents of Register 6-20 and Register 6-
21 represent the weighting of each bit in determining
the final number of tach counts used by the Fan Drive
Fail detection circuitry.
REGISTER 6-20:
DRIVE FAIL - DRIVE FAIL BAND HIGH BYTE REGISTER
(ADDRESSES 3BH, 4BH, 5BH, 6BH, 7BH)
RW-0
RW-0
RW-0
RW-0
RW-0
RW-0
RW-0
RW-0
FxDF[12:5]
bit 7
bit 0
Legend:
R = Readable 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 7-0
FxDF[12:5]: Drive Fail Band High Byte, where “x” represents 1 through 5 based on device features.
bit 7
4096
bit 6
2048
bit 5
1024
bit 4
512
bit 3
256
bit 2
128
bit 1
64
bit 0
32
REGISTER 6-21:
DRIVE FAIL - DRIVE FAIL BAND LOW BYTE REGISTER
(ADDRESSES 3AH, 4AH, 5AH, 6AH, 7AH)
RW-0
RW-0
RW-0
RW-0
RW-0
U-0
U-0
U-0
FxDF[4:0]
—
—
—
bit 7
bit 0
Legend:
R = Readable 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 7-3
FxDF[5:0]: Drive Fail Band Low Byte, where “x” represents 1 through 5 based on device features.
bit 7
16
bit 6
8
bit 5
4
bit 4
2
bit 3
1
bit 2-0
Unimplemented bits, read as ‘0’.



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