EMC1184 datasheet(19/48 Pages) MICROCHIP

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

Datasheet

SMSC EMC1184

Revision 1.0 (07-11-13)

DATASHEET

5.2

Conversion Rates

The EMC1184 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 EMC1184 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

Table 5.1 Supply Current vs. Conversion Rate for EMC1184

CONVERSION RATE

AVERAGE SUPPLY CURRENT

(TYPICAL)

AVERAGING FACTOR (BASED ON

11-BIT OPERATION)

ENABLED

(DEFAULT)

DISABLED

ENABLED

(DEFAULT)

DISABLED

1 / 16 sec

230uA

220uA

16x

1 / 8 sec

275uA

220uA

16x

1 / 4 sec

350uA

220uA

16x

1 / 2 sec

405uA

220uA

16x

1 / sec

480uA

250uA

2 / sec

850uA

290uA

4 / sec (default)

890uA

370uA

8 / sec

970uA

525uA

16 / sec

990uA

690uA

0.5x

32 / sec

1030uA

1050uA

0.25x

64 / sec

1500uA

1100uA

0.125x

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