EMC2103 Standard Microsystems Corporation, EMC2103 Datasheet - Page 53

• Manufacturer Part Number: EMC2103
• Description: Rpm-based Fan Controller with HW Thermal Shutdown
• Manufacturer: Standard Microsystems Corporation

RPM-Based Fan Controller with HW Thermal Shutdown
Datasheet
SMSC EMC2103
6.18
6.19
ADDR
ADDR
31h **
32h **
2Bh
30h
34h
38h
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
1
0
0
1
1
Bit 0 - POLARITY1 - Determines the polarity of PWM1 (if enabled).
The PWM Base Frequency Register controls base frequency of the PWM output.
Bits 1-0 - PWM_BASE[1:0] - Determines the base frequency of the PWM driver (PWM).
PWM Base Frequency Register
Limit Registers
‘0’ (default) - the Polarity of the PWM driver is normal. A drive setting of 00h will cause the output
to be set at 0% duty cycle and a drive setting of FFh will cause the output to be set at 100% duty
cycle.
‘1’ - The Polarity of the PWM driver is inverted. A drive setting of 00h will cause the output to be
set at 100% duty cycle and a drive setting of FFh will cause the output to be set at 0% duty cycle.
REGISTER
PWM Base
Frequency
PWM_BASE[1:0]
External Diode
External Diode
External Diode
External Diode
2 High Limit **
3 High Limit **
Internal Diode
1 High Limit
1 Low Limit
REGISTER
High Limit
Table 6.24 PWM Base Frequency Register
B7
Table 6.25 PWM_BASEx[1:0] it Decode
-
Sign
Sign
Sign
Sign
Sign
B7
Table 6.26 Limit Registers
0
0
1
0
1
B6
-
B6
64
64
64
64
64
DATASHEET
B5
-
53
B5
32
32
32
32
32
B4
-
B4
16
16
16
16
16
B3
-
B3
8
8
8
8
8
B2
BASE FREQUENCY
-
2,441Hz (default)
B2
4
4
4
4
4
19.531kHz
26.00kHz
4,882Hz
PWM_BASE[1:0
B1
B1
2
2
2
2
2
]
Revision 0.85 (01-29-08)
B0
B0
1
1
1
1
1
DEFAULT
DEFAULT
(+85°C)
(+85°C)
(+85°C)
(+85°C)
(0°C)
55h
55h
55h
55h
00h
03h