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EMC2113 数据表(PDF) 57 Page - Microchip Technology

部件名 EMC2113
功能描述  RPM-Based Fan Controller with Multiple Temperature Zones & Hardware Thermal Shutdown
PDF  88 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

EMC2113 数据表(HTML) 57 Page - Microchip Technology

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RPM-Based Fan Controller with Multiple Temperature Zones & Hardware Thermal Shutdown
Datasheet
 2013 Microchip Technology Inc.
DS20005251A-page 57
7.20
Limit Registers
The EMC2113 contains high limits for all temperature channels. If any measurement meets or exceeds
the high limit then the appropriate status bit is set and the ALERT pin is asserted (if enabled).
Additionally, the EMC2113 contains low limits for all temperature channels. If the temperature channel
drops below the low limit, then the appropriate status bit is set and the ALERT pin is asserted (if
enabled).
All Limit Registers are Software Locked.
7.21
PWM Input Duty Cycle High Limit Register
The PWM Duty Cycle High Limit register stores a high limit on the Duty Cycle input on the PWM pin.
The data format for the register is the same as the PWM Input Duty Cycle register (see Section 7.5,
"PWM Input Duty Cycle Register") and it is compared at the sampling rate of the PWM Input duty cycle.
If the PWM Input Duty Cycle meets or exceeds this limit, then the PWM status bit is set (see Section
7.13, "Interrupt Status Register") and the ALERT pin is asserted. This is treated as a temperature limit
by the Fan Control circuitry.
Table 7.28 Limit Registers
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
30h
R/W
External Diode
1 High Limit
Sign
64
32
16
8
4
2
1
55h
(+85°C)
31h
R/W
External Diode
2 High Limit
Sign
64
32
16
8
4
2
1
55h
(+85°C)
32h
R/W
External Diode
3 High Limit
Sign
64
32
16
8
4
2
1
55h
(+85°C)
34h
R/W
Internal Diode
High Limit
Sign
64
32
16
8
4
2
1
55h
(+85°C)
38h
R/W
External Diode
1 Low Limit
Sign
64
32
16
8
4
2
1
00h
(0°C)
39h
R/W
External Diode
2 Low Limit
Sign
64
32
16
8
4
2
1
00h
(0°C)
3Ah
R/W
External Diode
3 Low Limit
Sign
64
32
16
8
4
2
1
00h
(0°C)
3Ch
R/W
Internal Diode
Low Limit
Sign
64
32
16
8
4
2
1
00h
(0°C)
Table 7.29 PWM Duty Cycle High Limit Register
ADDR
R/W
REGISTER
B7
B6
B5
B4
B3
B2
B1
B0
DEFAULT
3Dh
R/W
PWM Input
Duty Cycle
High Limit
-
64
32
16
8
4
2
1
7Fh



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