EMC2103 datasheet(49/85 Pages) MICROCHIP

49 / 85 page

RPM-Based Fan Controller with Hardware Thermal Shutdown

Datasheet

 2013 Microchip Technology Inc.

DS0005250A-page 49

The REC Configuration Register determines whether Resistance Error Correction is used for each

external diode channel.

Bit 2 - REC3 (EMC2102-2 and EMC2103-4 only) - Controls the Resistance Error Correction

functionality of External Diode 3 (if enabled)



‘0’ - the REC functionality for External Diode 3 is disabled



‘1’ (default) - the REC functionality for External Diode 3 is enabled.

Bit 1 - REC2 (EMC2103-2 and EMC2103-4 only) - Controls the Resistance Error Correction

functionality of External Diode 2. If External Diode 2 is selected as the hardware shutdown channel

then this bit is read only and determined by the SHDN_SEL pin (see Section 5.1.1).



‘0’ - the REC functionality for External Diode 2 is disabled



‘1’ - the REC functionality for External Diode 2 is enabled.

Bit 0 - REC1 - Indicates the Resistance Error Correction functionality of External Diode 1. If External

Diode 1 is selected as the hardware shutdown channel then this bit is read only and determined by

the SHDN_SEL pin (see Section 5.1.1).



‘0’ - the REC functionality for External Diode 1 is disabled



‘1’ - the REC functionality for External Diode 1 is enabled.

The REC Configuration Register is software locked.

6.9

Critical Temperature Limit Registers

The Critical Temperature Limit Registers store the Critical Temperature Limit. At power up, none of the

respective channels are linked to the SYS_SHDN pin or the Hardware set Thermal/Critical Shutdown

circuitry.

Whenever one of the registers is updated, two things occur. First, the register is locked so that it cannot

be updated again without a power on reset. Second, the respective temperature channel is linked to

the SYS_SHDN pin and the Hardware set Thermal/Critical Shutdown Circuitry. At this point, if the

measured temperature channel exceeds the Critical limit, the SYS_SHDN pin will be asserted, the

appropriate bit set in the Tcrit Status Register, and the TCRIT bit in the Interrupt Status Register will

be set.

Table 6.14 Critical Temperature Limit Registers

ADDR

R/W

DEFAULT

19h

R/W

once

External Diode

1 Tcrit Limit

Sign

64h

(+100°C)

1Ah

R/W

once

External Diode

2 Tcrit Limit

Sign

64h

(+100°C)

1Bh

R/W

once

External Diode

3 Tcrit Limit

Sign

64h

(+100°C)

1Dh

R/W

once

Internal Diode

Tcrit Limit

Sign

64h

(+100°C)

EMC2103 Datasheet(PDF) 49 Page - Microchip Technology

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