EMC2101-R-ACZL-TR SMSC, EMC2101-R-ACZL-TR Datasheet - Page 42

• Manufacturer Part Number: EMC2101-R-ACZL-TR
• Description: Board Mount Temperature Sensors Single Fan Controller
• Manufacturer: SMSC

Specifications of EMC2101-R-ACZL-TR

• Full Temp Accuracy: +/- 2 C , +/- 3 C
• Package / Case: MSOP
• Output Type: Analog
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

APPLICATION NOTE: This bit will be ignored if the ALT_TCH bit in the Configuration Register (see
APPLICATION NOTE: If the SPIN_TIME[2:0] bits are set at 000b, then the Spin-Up Routine is bypassed regardless
Revision 2.54 (06-16-09)
6.17
ADDR.
4Bh
TACH_M[1]
R/W
R/W
Bit 1-0 - TACH_M[1:0] - Determines the basic operation of the tachometer input as shown in
Table
Note 6.2
The Fan Spin Up Configuration register controls the spin-up behavior of the device. The Fan driver
enters its spin-up routine any time it transitions from a minimum fan setting (00h) to a higher fan setting
(but does not invoke the spin-up routine upon power up). Once the spin-up time has been met, the
fan driver is reduced to the programmed setting.
Bit 5 - FAST_TACH - Determines whether the Spin-Up routine aborts when the measured TACH is less
than the TACH Limit.
Bit 4 - 3 SPIN_DRIVE[1:0] - Determines the setting of the drive circuit during the Spin-Up routine
according to
Fan Spin Up Configuration Register
0
0
1
1
‘0’ - The Spin-Up routine uses the duty cycle and spin-up time independently of the TACH reading.
‘1’ (default) - The Spin-Up routine will abort when the TACH measurement is less than the TACH
Limit or the programmed Spin-Up time is met, whichever is less. In this case, the SPIN_DRIVE[1:0]
bits are ignored and the drive will always be at 100%.
6.19.
Fan Spin Up
REGISTER
set to ‘0’.
of the status of this bit.
Config
When the PWM base clock is set at 360kHz mode 00b is used regardless of the setting
of the TACH_M[1:0] bits.
Table
Table 6.20 Fan Spin Up Configuration Register
6.21.
B7
-
Table 6.19 TACH Modes
B6
-
TACH_M[0]
DATASHEET
FAST_
TACH
0
1
0
1
B5
42
SMBus Fan Control with 1°C Accurate Temperature Monitoring
SPIN_DRIVE[1:0]
B4
B3
False readings when under minimum
detectable RPM (TACH Limit).
(Default condition - See
FFFFh reading when under minimum
detectable RPM.
B2
SPIN_TIME[2:0]
TACH MODE
B1
B0
Note
SMSC EMC2101
Section
DEFAULT
6.2)
Datasheet
3Fh
6.5) is