EMC1428 datasheet(21/53 Pages) MICROCHIP

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1°C Multiple Temperature Sensor with HW Thermal Shutdown & Hottest of Thermal Zones

Data Sheet

 2014 Microchip Technology Inc.

DS20005275A-page 21

4.5.5

Conversion Rates

The EMC1428 may be configured for different conversion rates based on the system requirements.

The conversion rate is configured as described in Section 5.5. The default conversion rate is 4

conversions per second. Other available conversion rates are shown in Table 5.7.

4.5.6

Dynamic Averaging

Dynamic averaging causes the EMC1428 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 5.5). 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 4x 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 will affect the average supply current based on the chosen

conversion rate as shown in Table 4.2 for EMC1428.

4.6

Diode Connections

The diode connection for the External Diode 1 channel is determined based on the selected device.

For the EMC1428, this channel can support a diode-connected transistor (such as a 2N3904) or a

substrate transistor (such as those found in an CPU or GPU) as shown in Figure 4.4. Anti-parallel

diodes are not supported on the External Diode 1 channel.

Table 4.2 Supply Current vs. Conversion Rate for EMC1428

CONVERSION RATE

AVERAGE SUPPLY CURRENT

AVERAGING FACTOR (BASED ON

11-BIT OPERATION)

DYNAMIC

AVERAGING

ENABLED

(DEFAULT)

DYNAMIC

AVERAGING

DISABLED

DYNAMIC

AVERAGING

ENABLED

(DEFAULT)

DYNAMIC

AVERAGING

DISABLED

1 / sec

715uA

450uA

2 / sec

750uA

550uA

4 / sec (default)

900uA

815uA

Continuous (see Table 5.8)

950uA

0.5x

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