EMC2113 datasheet(34/88 Pages) MICROCHIP

34 / 88 page

RPM-Based Fan Controller with Multiple Temperature Zones & Hardware Thermal Shutdown

Datasheet

DS20005251A-page 34

 2013 Microchip Technology Inc.

6.10.2

Continuous Operation

When configured to operate in Continuous Operation, the Watchdog timer will start immediately. It can

be disabled by any access (read or write) to the SMBus register set. Upon completion of SMBus

activity, the Watchdog timer is reset and restarted.

6.11

Fault Queue

The EMC2113 contains a programmable fault queue on all fault conditions. The fault queue defines

how many consecutive out-of-limit conditions must be reported before the corresponding status bit is

set (and the ALERT pin asserted).

6.12

ALERT Pin

The ALERT pin acts as an active low open drain interrupt that flags several conditions. It will be

asserted low when:

1. The FSC Algorithm detects a stalled fan.

2. The measured temperature meets or exceeds its programmed high limit or drops below its

programmed low limit.

3. A diode fault is detected.

4. The PWM input duty cycle has exceeded its programmed limit.

Once asserted, the ALERT pin will remain asserted until the status bits have been cleared or the MASK

bit has been set.

6.13

Temperature Monitoring

The EMC2113 can monitor the temperature of up to three (3) externally connected diodes as well as

the internal or ambient temperature. Each channel is configured with Resistance Error Correction, BJT

Transistor model support, and Averaging enabled or disabled based on user settings and system

requirements. All temperature channels offer 1°C accuracy and 0.125°C resolution.

6.13.1

Dynamic Averaging

The EMC2113 supports dynamic averaging. When enabled, this feature changes the conversion time

for all channels based on the selected conversion rate. This essentially increases the averaging factor

as shown in Table 6.4, "Dynamic Averaging Behavior". The benefits of Dynamic Averaging are

improved noise rejection due to the longer integration time as well as less random variation on the

temperature measurement.

Table 6.4 Dynamic Averaging Behavior

CONVERSION RATE

AVERAGING FACTOR (RELATIVE TO 11-BIT CONVERSI0N)

DYNAMIC AVERAGING

ENABLED

DYNAMIC AVERAGING

DISABLED

1 / sec

2 / sec

4 / sec

Continuous

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