EMC1413 datasheet(19/52 Pages) SMSC

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Multiple Channel 1°C Temperature Sensors with Beta Compensation

Datasheet

SMSC EMC1413 / EMC1414

Revision 1.41 (02-23-12)

DATASHEET

6.1

Modes of Operation

The EMC1413 and EMC1414 have two modes of operation.

Active (Run) - In this mode of operation, the ADC is converting on all temperature channels at the

programmed conversion rate. The temperature data is updated at the end of every conversion and

the limits are checked. In Active mode, writing to the one-shot register will do nothing.

Standby (Stop) - In this mode of operation, the majority of circuitry is powered down to reduce

supply current. The temperature data is not updated and the limits are not checked. In this mode

of operation, the SMBus is fully active and the part will return requested data. Writing to the one-

shot register will enable the device to update all temperature channels. Once all the channels are

updated, the device will return to the Standby mode.

6.1.1

Conversion Rates

The EMC1413 / EMC1414 may be configured for different conversion rates based on the system

requirements. The conversion rate is configured as described in Section 7.5. The default conversion

rate is 4 conversions per second. Other available conversion rates are shown in Table 7.6, "Conversion

Rate".

6.1.2

Dynamic Averaging

Dynamic averaging causes the EMC1413 / EMC1414 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 7.4, "Configuration Register"). 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 6.1

Figure 6.2 System Diagram for EMC1413

CPU / GPU

EMC1413

Host

DP1

DN1

SMDATA

Thermal

Junction

SMCLK

SMBus

Interface

THERM / ADDR

ALERT

Power Control

VDD

GND

VDD = 3.3V

3.3V – 5V

DN2

DP2

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