EMC1002 datasheet(16/22 Pages) SMSC

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1°C Dual SMBus Sensor with Resistance Error Correction

Datasheet

Revision 1.3 (03-24-06)

SMSC EMC1002

DATASHEET

the Configuration Register. The user is required to update the limit registers to the new format when

changing between measurement data formats.

The user can configure high and low temperature limits and an independent THERM limit. The

temperature high limit (TH) is an 11-bit value that is set by the Temperature High Limit High Byte

The temperature low limit (TL) is an 11-bit value that is set by the Temperature Low Limit High Byte

The limits are automatically compared to the temperature measurement results (TM) and have been

exceeded if (TM ≤ TL or TM > TH). If either limit is exceeded then the appropriate bit is set high in the

status register and the ALERT/THERM2 output will respond as described in Section 4.5 on page 11.

The THERM limit (TTH) is a single byte value set by the THERM Limit register. Exceeding the THERM

limit asserts the ADDR/THERM signal as described in Section 4.6 on page 12. When the

ALERT

/THERM2 pin is configured as THERM2, then exceeding the high limit asserts this pin.

4.13

THERM Hysteresis Register

The THERM hysteresis register holds a hysteresis value that impacts the de-assertion of THERM as

shown in Figure 4.4 on page 12. It defaults to 10

°C and can be set by the user at any time after power

up. When the ALERT/THERM2 pin is configured as THERM2, then the output will not de-assert until the

temperature drops below the Temperature High Limit minus the THERM Hysteresis value.

4.14

One-Shot Register

Writing to the one-shot register while in standby mode initiates a conversion and comparison cycle.

The EMC1002 will execute a temperature measurement, compare the data to the limit registers and

return to the standby mode. A write to the one-shot register will be ignored if it occurs while the

EMC1002 is in run mode.

4.15

Scratchpad Registers

The scratchpad registers may be used to verify SMBus communications. These registers do not have

any affect on the operation of the device, and may be written and read via the SMBus.

4.16

Ideality Factor Register

The ideality factor registers are used to program the remote diode ideality factor into the EMC1002 so

that this error source can be eliminated. The default ideality factor is 1.008 and has a value of

XX010010b or 12h.

Table 4.7 Diode Ideality Factor Values

DIODE

IDEALITY

FACTOR

VALUE

DIODE

IDEALITY

FACTOR

VALUE

DIODE

IDEALITY

FACTOR

VALUE

DIODE

IDEALITY

FACTOR

VALUE

0.9850

XX00 0000

1.0054

XX01 0000

1.0267

XX10 0000

1.0489

XX11 0000

0.9862

XX00 0001

1.0067

XX01 0001

1.0280

XX10 0001

1.0503

XX11 0001

0.9875

XX00 0010

1.0080

XX01 0010

1.0294

XX10 0010

1.0517

XX11 0010

0.9888

XX00 0011

1.0093

XX01 0011

1.0308

XX10 0011

1.0531

XX11 0011

0.9900

XX00 0100

1.0106

XX01 0100

1.0321

XX10 0100

1.0546

XX11 0100

0.9913

XX00 0101

1.0119

XX01 0101

1.0335

XX10 0101

1.0560

XX11 0101

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