EMC6D103-CZC SMSC, EMC6D103-CZC Datasheet - Page 57

• Manufacturer Part Number: EMC6D103-CZC
• Description: Industrial Temperature Sensors Auto Fan Contrllr Up to 4 Fans
• Manufacturer: SMSC

Specifications of EMC6D103-CZC

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

Fan Control Device with High Frequency PWM Support and Hardware Monitoring Features
Datasheet
SMSC EMC6D103
8.2.5
8.2.6
Register
Address
Register
Address
2Ah
2Bh
2Ch
2Dh
2Eh
2Fh
28h
29h
30h
31h
32h
Read/Wr
Note
Note
Note
Read/
Write
Registers 28-2Fh: Fan Tachometer Reading
The Fan Tachometer Reading registers contain the number of 11.111 μ s periods (90KHz) between full
fan revolutions. Fans produce two tachometer pulses per full revolution. These registers are updated
at least once every second.
This value is represented for each fan in a 16 bit, unsigned number.
The Fan Tachometer Reading registers always return an accurate fan tachometer measurement, even
when a fan is disabled or non-functional, including when the start bit=0.
When one byte of a 16-bit register is read, the other byte latches the current value until it is read, in
order to ensure a valid reading. The order is LSB first, MSB second.
FFFFh indicates that the fan is not spinning, or the tachometer input is not connected to a valid signal
(This could be triggered by a counter overflow).
These registers are read only – a write to these registers has no effect.
Registers 30-32h: Current PWM Duty
Note 8.8
R
(See
R
(See
R
(See
R
R
R
R
R
R
R
R
ite
/W
/W
/W
8.8)
8.8)
8.8)
PWM1 Current Duty Cycle
PWM2 Current Duty Cycle
PWM3 Current Duty Cycle
These registers are only writable when the associated fan is in manual mode. These
registers become read only when the Lock bit is set. Any further attempts to write to these
registers shall have no effect.
Register Name
Register Name
Table 8.8 Registers 28-2Fh: Fan Tachometer Reading
Tach1 MSB
Tach2 MSB
Tach3 MSB
Tach4 MSB
Tach1 LSB
Tach2 LSB
Tach3 LSB
Tach4 LSB
Table 8.9 Registers 30-32h: Current PWM Duty
DATASHEET
(MSb)
(MSb)
Bit 7
Bit 7
15
15
15
15
7
7
7
7
7
7
7
57
Bit 6
Bit 6
14
14
14
14
6
6
6
6
6
6
6
Bit 5
Bit 5
13
13
13
13
5
5
5
5
5
5
5
Bit 4
Bit 4
12
12
12
12
4
4
4
4
4
4
4
Bit 3
Bit 3
11
11
11
11
3
3
3
3
3
3
3
Bit 2
Bit 2
10
10
10
10
2
2
2
2
2
2
2
Bit 1
Bit 1
Revision 0.3 (03-01-07)
1
1
1
1
9
1
9
1
9
1
9
(LSb)
Bit 0
(LSb)
Bit 0
0
0
0
0
8
0
8
0
8
0
8
Default
Default
Value
Value
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A