EMC2103 datasheet(66/85 Pages) MICROCHIP

66 / 85 page

RPM-Based Fan Controller with Hardware Thermal Shutdown

Datasheet

DS0005250A-page 66

 2013 Microchip Technology Inc.



‘0’ (default) - The Pushed Temperature 1 Register is not using DTS data. The contents of the

Pushed Temperature 1 registers is standard temperature data.



‘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.

Bit 6 - USE_DTS_F2 - This bit determines whether the Pushed Temperature 2 Register is using DTS

data.



‘0’ (default) - The Pushed Temperature 2 Register is not using DTS data. The contents of this



‘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.

Bit 5 - LUT_LOCK - This bit locks updating the Look Up Table entries and determines whether the look

up table is being used.



‘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.

APPLICATION NOTE: When the LUT_LOCK bit is set at a logic ‘0’, the PWM drive setting will be set at whatever

value was last used by the RPM based Fan Speed Control Algorithm or the Look Up Table.

Bit 4 - RPM / PWM - This bit selects the data format for the LUT drive settings.



‘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.

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.



‘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.

Bit 0 - TEMP4_CFG - Determine the temperature channel that is used for the Temperature 4 inputs to

the 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.

6.33

Look Up Table Registers

Table 6.50 Look Up Table Registers

ADDR

R/W

RPM /

PWM

DEFAULT

51h

R/W

LUT Drive

Setting 1

‘0’

4096

2048

1024

512

256

128

FBh

‘1’

128

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