EMC2305-1-AP-TR SMSC, EMC2305-1-AP-TR Datasheet - Page 35

• Manufacturer Part Number: EMC2305-1-AP-TR
• Description: Industrial Temperature Sensors Penta RPM-Based PWN Fan Speed Controller
• Manufacturer: SMSC

Specifications of EMC2305-1-AP-TR

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

ADDR
2Ch
2Dh
Multiple RPM-Based PWM Fan Controller for Five Fans
Datasheet
SMSC EMC2305
5.6
5.6.1
5.6.2
R/W
R/W
R/W
1
0
0
1
1
The PWM Base Frequency registers determine the base frequency that is used with the PWM Divide
register to determine the final PWM frequency. Each PWM frequency is set by the base frequency and
its respective divide ratio (see
PWM Base Frequency 1 - 2Bh
Controls the base frequency of PWM drivers 4 and 5.
Bits 3-2 - PWM_BASE5[1:0] - Determines the base frequency of the PWM5 driver.
Bits 1-0 - PWM_BASE4[1:0] - Determines the base frequency of the PWM4 driver.
PWM Base Frequency 2 - 2Ch
Controls the base frequency of PWM drivers 1-3
Bits 5-6 - PWM_BASE3[1:0] - Determines the base frequency of the PWM3 driver.
Bits 3-2 - PWM_BASE2[1:0] - Determines the base frequency of the PWM2 driver.
Bits 1-0 - PWM_BASE1[1:0] - Determines the base frequency of the PWM1 driver.
PWM Base Frequency Registers
REGISTER
PWM Base
PWM Base
Frequency
Frequency
PWM_BASEX[1:0]
1
2
B7
-
-
Table 5.6 PWM Base Frequency Registers
Table 5.7 PWM_BASEx[1:0] Bit Decode
B6
0
0
1
0
1
-
-
Section
DATASHEET
PWM_
BASE
3_1
5.8).
B5
-
35
PWM_
BASE
3_0
B4
-
PWM_
BASE
PWM_BASE5
2_1
B3
[1:0]
BASE FREQUENCY
26.00kHz (default)
PWM_
BASE
2_0
19.531kHz
B2
4,882Hz
2,441Hz
PWM_
BASE
PWM_BASE4
1_1
B1
Revision 1.2 (03-22-10)
[1:0]
PWM_
BASE
1_0
B0
DEFAULT
00h
00h