EMC2101-R-ACZL-TR datasheet(21/56 Pages) MICROCHIP

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DS20006703A-page 21

EMC2101

5.0

The following registers are accessible through the

SMBus Interface. The registers are described in

functional order. Registers with multiple addresses are

included for software compatibility. Writing or reading

from either address will point to the same internal

TABLE 5-1:

Address

R/W

Function

Default

Value

00h

Internal Temperature

Stores the Internal Temperature

00h

01h

External Diode

Temperature High Byte

Stores the External Temperature High

Byte

00h

02h

Status

Reports internal, external and TCRIT

alarms

00h

03h and 09h

R/W

Configuration

Alert Mask, STANDBY, TCRIT override,

Alert Fault Queue

00h

04h and 0Ah

R/W

Conversion Rate

Sets conversion rate

08h

(16/sec)

05h and 0Bh

R/W

Internal Temp Limit

ALERT/TACH asserted if measured

temp above this value

46h

(+70°C)

07h and 0Dh

R/W

External Temp High Limit

High Byte

ALERT/TACH asserted if measured

temp above this value

46h

(+70°C)

08h and 0Eh

R/W

External Temp Low Limit

High Byte

ALERT/TACH asserted if measured

temp below this value

00h

(+0°C)

0Ch

R/W

External Temperature

Force

Force the temperature for determining

the next fan speed used in the Fan

Control Look-Up Table

00h

0Fh

R/W

One Shot

When written, performs a one-shot

conversion.

00h

10h

External Diode

Temperature Low Byte

Stores the External Temperature Low

Byte

00h

11h

R/W

Scratchpad

Scratchpad – This register is read/write

but does nothing

00h

12h

R/W

Scratchpad

Scratchpad – This register is read/write

but does nothing

00h

13h

R/W

External Diode High Limit

Low Byte

Fractional data of High Limit

00h

14h

R/W

External Diode Low Limit

Low Byte

Fractional data of Low Limit

00h

16h

R/W

Alert Mask

Disables alarms

A4h

17h

R/W

External Diode Ideality

Factor

Sets ideality factor based on diode type

12h

(1.008)

18h

R/W

Beta Compensation Factor Compensates for transistors with

various beta factors

08h

19h

R/W

TCRIT Temp Limit

Fan will be set to full speed if external

temp above this value

55h

(+85°C)

21h

R/W

TCRIT Hysteresis

Amount of hysteresis applied to TCRIT

Temp (1LSB = +1°C)

0Ah

(+10°C)

Note 1: The Look Up Table Registers are made Read Only if the PWM Program bit (bit 5) in PWM Configuration

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