EMC1182 datasheet(19/48 Pages) MICROCHIP

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Dual Channel 1°C Temperature Sensor with Beta Compensation and 1.8V SMBus Communications

Datasheet

SMSC EMC1182

Revision 1.0 (07-11-13)

DATASHEET

5.2

Conversion Rates

The EMC1182 may be configured for different conversion rates based on the system requirements.

The conversion rate is configured as described in Section 6.5. The default conversion rate is 4

conversions per second. Other available conversion rates are shown in Table 6.6, "Conversion Rate".

5.3

Dynamic Averaging

Dynamic averaging causes the EMC1182 to measure the external diode channels for an extended time

based on the selected conversion rate. This functionality can be disabled for increased power savings

at the lower conversion rates (see Section 6.4, "Configuration Register 03h / 09h"). When dynamic

averaging is enabled, the device will automatically adjust the sampling and measurement time for the

external diode channels. This allows the device to average 2x or 16x longer than the normal 11 bit

operation (nominally 21ms per channel) while still maintaining the selected conversion rate. The

benefits of dynamic averaging are improved noise rejection due to the longer integration time as well

as less random variation of the temperature measurement.

When enabled, the dynamic averaging applies when a one-shot command is issued. The device will

perform the desired averaging during the one-shot operation according to the selected conversion rate.

When enabled, the dynamic averaging will affect the average supply current based on the chosen

conversion rate as shown in Table 5.1

5.4

THERM Output

The THERM output is asserted independently of the ALERT output and cannot be masked. Whenever

any of the measured temperatures exceed the user programmed Therm Limit values for the

programmed number of consecutive measurements, the THERM output is asserted. Once it has been

asserted, it will remain asserted until all measured temperatures drop below the Therm Limit minus

the Therm Hysteresis (also programmable).

Table 5.1 Supply Current vs. Conversion Rate for EMC1182

CONVERSION RATE

AVERAGE SUPPLY CURRENT

(TYPICAL)

AVERAGING FACTOR (BASED ON

11-BIT OPERATION)

ENABLED

(DEFAULT)

DISABLED

ENABLED

(DEFAULT)

DISABLED

1 / 16 sec

210uA

200uA

16x

1 / 8 sec

265uA

200uA

16x

1 / 4 sec

330uA

200uA

16x

1 / 2 sec

395uA

200uA

16x

1 / sec

460uA

215uA

16x

4 / sec (default)

890uA

325uA

8 / sec

1010uA

630uA

16 / sec

1120uA

775uA

32 / sec

1200uA

1050uA

64 / sec

1400uA

1100uA

0.5x

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