emc2103-3-kp-tr Standard Microsystems Corp., emc2103-3-kp-tr Datasheet - Page 64

• Manufacturer Part Number: emc2103-3-kp-tr
• Description: Emc2103 Rpm-based Fan Controller With Hardware Thermal Shutdown
• Manufacturer: Standard Microsystems Corp.

ADDR
51h
APPLICATION NOTE: When the LUT_LOCK bit is set at a logic ‘0’, the PWM drive setting will be set at whatever
Revision 0.88 (06-30-08)
6.33
R/W
R/W
Bit 6 - USE_DTS_F2 - This bit determines whether the Pushed Temperature 2 Register is using DTS
data.
Bit 5 - LUT_LOCK - This bit locks updating the Look Up Table entries and determines whether the look
up table is being used.
Bit 4 - RPM / PWM - This bit selects the data format for the LUT drive settings.
Bit 2 - TEMP3_CFG - Determine the temperature channel that is used for the Temperature 3 inputs to
the Look Up Table. If the External Diode 3 channel is not enabled, then the Temperature 3 inputs are
not used by the Look Up Table.
Bit 0 - TEMP4_CFG - Determine the temperature channel that is used for the Temperature 4 inputs to
the Look Up Table.
Look Up Table Registers
REGISTER
LUT Drive
‘1’ - The Pushed Temperature 1 Register is loaded with DTS data. The contents of this register is
automatically subtracted from a fixed value of 100°C before being compared to the Look Up Table
threshold levels.
‘0’ (default) - The Pushed Temperature 2 Register is not using DTS data. The contents of this
register is standard 2’s complement temperature data.
‘1’ - The Pushed Temperature 2 Register is loaded with DTS data. The contents of this register is
automatically subtracted from a fixed value of 100°C before being compared to the Look Up Table
threshold levels.
‘0’ (default) - The Look Up Table entries can be updated normally. The Look Up Table will not be
used while the Look Up Table entries are unlocked. During this condition, the PWM output will not
change states regardless of temperature or tachometer variation.
‘1’ - The Look Up Table entries are locked and cannot be updated. The Look Up Table is fully active
and will be used based on the loaded values. The PWM output will be updated depending on the
temperature and / or TACH variations.
‘0’ (default) - The Look Up Table drive settings are RPM TACH count values for use by the RPM
based Fan Speed Control Algorithm. The Look Up Table drive settings should be loaded highest
value to lowest value (to coincide with the inversion between TACH counts and actual RPM).
‘1’ - The Look Up Table drive settings are PWM duty cycle values and are used directly. The drive
settings should be loaded lowest value to highest value.
‘0’ (default) - The External Diode 3 channel is used by the Fan Look Up Table (if enabled).
‘1’ - The data written into the Pushed Temperature 1 Register is used by the Fan Look Up Table.
‘0’ (default) - The Internal channel is used by the Fan Look Up Table.
‘1’ - The data written into the Pushed Temperature 2 Register is used by the Fan Look Up Table.
Setting 1
value was last used by the RPM based Fan Speed Control Algorithm or the Look Up Table.
RPM /
PWM
‘0’
‘1’
Table 6.50 Look Up Table Registers
4096
128
B7
DATASHEET
2048
B6
64
64
1024
B5
32
RPM-Based Fan Controller with HW Thermal Shutdown
512
B4
16
256
B3
8
128
B2
4
B1
64
2
B0
32
SMSC EMC2103
1
Datasheet
DEFAULT
FBh