EMC2101-R-ACZL-TR datasheet(35/57 Pages) SMSC

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SMBus Fan Control with 1°C Accurate Temperature Monitoring

Datasheet

SMSC EMC2101

Revision 2.54 (06-16-09)

DATASHEET

‘0’ (default) - The ALERT / TACH pin will function as an open drain, active low interrupt.

‘1’ - The ALERT / TACH pin will function as a high impedance TACH input. This may require an

external pull-up resistor to set the proper signaling levels.

Bit 1 - TCRITOVRD - Allows the TCRIT limit to be overridden.

'0' (default) - TCRIT limit is set to default value and locked.

'1' - The TCRIT limit is unlocked for modification. The TCRIT limit can only be changed once. To

adjust TCRIT again, a power cycle is required.

Bit 0 - QUEUE - Sets the number of external diode over-temp measurements required to assert ALERT

/ TACH pin.

'0' (default) - ALERT / TACH pin is asserted (and status bit set) after one external temperature

measurement exceeds the high limit or the TCRIT limit or drops below the low limit.

'1' - ALERT / TACH pin is asserted (and status bit set) after three consecutive external temperature

measurements exceed the high limit or the TCRIT limit or drop below the low limit.

6.6

Conversion Rate Register

Bits 3- 0 - CONV[3:0] - The Conversion Rate Register controls the conversion rate per Table 6.6.

Table 6.5 Conversion Rate Register

ADDR.

R/W

DEFAULT

04h and

0Ah

R/W

Conversion

Rate

CONV3

CONV2

CONV1

CONV0

08h

Table 6.6 Conversion Rates

CONV[3:0]

CONVERSIONS PER SECOND

1/16

1/8

1/4

1/2

16 (default)

all others

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