EMC1001_15 datasheet(15/24 Pages) MICROCHIP

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DS20005411A-page 15

EMC1001

4.9

Conversion Rate Register

The Conversion Rate register determines how many

times the temperature value will be updated per sec-

ond. The lowest 4 bits configure a programmable delay

that waits between consecutive conversion cycles to

obtain the desired conversion rate. Table 4-4 shows the

conversion rate and the associated quiescent current.

4.10

Limit Registers

The user can configure high and low temperature limits

and an independent THERM limit. The temperature

high limit (TH) is a 10-bit value that is set by the

Temperature High Limit High Byte register and the

Temperature High Limit Low Byte register. The

Temperature High Limit Low Byte register contains the

two least significant bits, as shown in Table 4-2. The

two least significant bits are stored in the upper two bits

of the register, and the six LSB positions of this register

always read zero.

The temperature low limit (TL) is a 10-bit value that is

set by the Temperature Low Limit High Byte register

and the Temperature Low Limit Low Byte register, as

shown in Table 4-2.

The limits are compared to the temperature measure-

ment results (TINT) and have been exceeded if

(TINT  TL or TINT >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 4.3 “ALERT/THERM2 Output”.

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 4.4 “ADDR/THERM Output”. When the

ALERT/THERM2 pin is configured as THERM2, then

exceeding the high limit asserts this pin.

4.11

THERM Hysteresis Register

The THERM Hysteresis register holds a hysteresis

value that determines the de-assertion of THERM, as

shown in Figure 4-4. 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, the

hysteresis value also impacts the de-assertion of

THERM2.

4.12

One-Shot Register

Writing to the One-shot register while in Standby mode

initiates a conversion and comparison cycle. The

EMC1001 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 EMC1001 is in Run mode.

4.13

SMBus Timeout Enable

The EMC1001 has an SMBus timeout feature. Bit 7 of

the SMBus Timeout Enable register enables this func-

tion when set to 1 (the default setting is 0). When this

feature is enabled, the SMBus will timeout after approx-

imately 25 ms of inactivity.

TABLE 4-4:

CONVERSION RATES

Conversion

Rate Value

Conversions/

Second

Typical Quiescent

Current (µA)

00h

0.0625

01h

0.125

02h

0.25

03h

0.5

04h (default)1

05h

06h

07h

109

08h

182

09h

326

0Ah to FFh

Reserved

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