EMC2303-1-KP-TR Standard Microsystems (SMSC), EMC2303-1-KP-TR Datasheet - Page 32

• Manufacturer Part Number: EMC2303-1-KP-TR
• Manufacturer: Standard Microsystems (SMSC)

Specifications of EMC2303-1-KP-TR

• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (max): 3.6V
• Operating Temp Range: -40C to 125C
• Operating Temperature Classification: Automotive
• Mounting: Surface Mount
• Pin Count: 12
• Lead Free Status / RoHS Status: Compliant

ADDR
Revision 1.2 (03-22-10)
5.7
30h
40h
50h
R/W
R/W
R/W
R/W
1
0
0
1
1
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.
The Fan Setting register always displays the current setting of the respective fan driver. Reading from
any of the registers will report the current fan speed setting of the appropriate fan driver regardless of
the operating mode. Therefore it is possible that reading from this register will not report data that was
previously written into this register.
While the RPM-based Fan Speed Control Algorithm is active, the register is read only. Writing to the
register will have no effect and the data will not be stored.
The contents of the register represent the weighting of each bit in determining the final output voltage.
The output drive for a PWM output is given by
Fan Setting Registers
PWM_BASEX[1:0]
Fan 1 Setting
Fan 2 Setting
Fan 3 Setting
REGISTER
Drive
Table 5.7 PWM_BASEx[1:0] Bit Decode
Table 5.8 Fan Driver Setting Registers
=
128
128
128
⎛
⎝
B7
VALUE
-------------------- -
0
0
1
0
1
255
DATASHEET
B6
64
64
64
⎞
⎠
×
100%
32
B5
32
32
32
Equation
B4
Multiple RPM-Based PWM Fan Controller for Three Fans
16
16
16
[1].
B3
8
8
8
BASE FREQUENCY
26.00kHz (default)
19.531kHz
B2
4
4
4
4,882Hz
2,441Hz
B1
2
2
2
[1]
B0
1
1
1
SMSC EMC2303
DEFAULT
Datasheet
00h
00h
00h