EMC2101-R-ACZL-TR datasheet(28/56 Pages) MICROCHIP

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EMC2101

DS20006703A-page 28

 2022 Microchip Technology Inc. and its subsidiaries

5.7

Temperature Limit Registers

The EMC2101 has two 8-bit limit registers, two 11-bit

limit registers, and one hysteresis register. The limits

are checked after every temperature conversion.

If the measured temperature for the internal diode

exceeds the Internal Temperature limit, then the

INT_HIGH bit is set in the Status Register. It will remain

set until the internal temperature drops below the high

limit.

If the measured temperature for the External Diode

exceeds the 11-bit External Diode High Limit, or drops

below the 11-bit External Diode Low Limit, then the

appropriate status bit will be set. The status bit will

remain set until the temperature is no longer violating

the respective limits.

If the External Diode exceeds the TCRIT Temp Limit

(even if it does not exceed the External Diode

Temperature Limit), the TCRIT bit will be set in the

Status Register.

The TCRIT bit will remain set in the Status Register

until the External Diode Temperature drops below a

lower threshold given by Equation 5-1.

EQUATION 5-1:

See Section 5.3, Temperature Data Registers and

Section 5.5, Configuration Register for ALERT/TACH

pin functionality.

5.8

External Temperature Force

The External Diode Force Register is used to force the

Fan Control Look-Up Table to a specific fan-speed

setting.

When

this

function

enabled

(see

Section 5.16 “Fan Configuration Register”), the

contents of this register are compared against the

temperature thresholds in the Fan Control Look-Up

Table to determine the fan setting to use.

The contents of this register represent temperature

data in the same format as the data registers and can

be updated at any time.

The External Diode Temperature Registers are

updated normally with the measured temperature and

compared against the THIGH and TCRIT limits

normally but not used to determine the fan speed.

This mode is used if the host or system requires

temperature data from a source other than the

EMC2101 External Diode to be used for fan control.

TEMP

TCRIT TCRITHYS

–



TEMPERATURE DATA REGISTERS

Address

R/W

B7B6B5B4B3B2

B1B0

Default

05h and

0Bh

R/W

Internal Temp

Limit

—

643216

46h

(+70°C)

07h and

0Dh

R/W

External Diode

High Limit MSB

—

643216

46h

(+70°C)

08h and

0Eh

R/W

External Diode

Low Limit MSB

—

643216

00h

(+0°C)

13h

R/W

External Diode

High Limit LSB

0.5

0.25

0.125

—

00h

14h

R/W

External Diode

Low Limit LSB

0.5

0.25

0.125

—

00h

19h

R/W

TCRIT Temp

Limit

—

643216

55h

(+85°C)

21h

R/W

TCRIT

Hysteresis

—

643216

0Ah

(+10°C)

EXTERNAL DIODE FORCE REGISTER (ADDRESS 0Ch)

Address

R/W

B7B6B5B4B3B2B1B0

Default

0Ch

R/W

External Temperature

Force

Sign

00h

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