EMC2104 datasheet(37/101 Pages) SMSC

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Dual RPM-Based PWM Fan Controller with Hardware Thermal Shutdown

Datasheet

SMSC EMC2104

Revision 1.74 (05-08-08)

DATASHEET

5.13.1

Diode Faults

The EMC2104 actively detects an open and short condition on each measurement channel. When a

diode fault is detected, the temperature data MSByte is forced to a value of 80h and the FAULT bit is

set in the Status Register. When the External Diode 3 channel is configured to operate in APD mode,

the circuitry will detect independent open fault conditions, however a short condition will be shared

between the External Diode 3 and External Diode 4 channels.

5.14

GPIOs

The EMC2104 contains up to three (3) GPIOs pin (all are multiplexed with other functions). The GPIO

pins can be configured as an input or an output and as a push-pull or open-drain output. Additionally,

the GPIO pins, when configured as an input, can be enabled to trigger an interrupt when they change

states.

5.15

Interrupts

If a change of state occurs (such as a temperature out-of-limit condition or a GPIO changing states)

then the following will occur:

1. The appropriate status bits will be set in the Status Register and in the High, Low, and Fault Status

Registers.

2. The ALERT# will be asserted if the specific channel interrupt is enabled (see Section 6.15).

The ALERT# pin is cleared by setting the MASK bit, disabling the specific interrupt channel enable, or

reading the status registers. If the error conditions persist, then the status bits will remain set. Unless

the Interrupt Status Enable bits are cleared or the MASK bit is set, the ALERT# pin will likewise be set.

Figure 5.7 Diode Connections

Local Ground

Typical remote

substrate transistor

i.e. CPU substrate PNP

Typical remote

discrete PNP transistor

i.e. 2N3906

Typical remote

discrete NPN transistor

i.e. 2N3904

Anti-parallel diodes using

discrete NPN transistors

Diode 1

Diode 2

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