EMC2113 datasheet(52/85 Pages) SMSC

52 / 85 page

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

Datasheet

Revision 1.2 (10-08-09)

SMSC EMC2113

DATASHEET

Bit 5 - DIS_TO - Disables the SMBus timeout function.

‘0’ (default) - The SMBus timeout function is enabled.

‘1’ - The SMBus timeout function is disabled allowing the device to be fully I2C compliant.

Bit 4 - DIS_AVG - Disables digital averaging of the External Diode channels.

‘0’ (default) - The External Diode channels have digital averaging enabled. The temperature data

is the average of the previous four measurements.

‘1’ - The External Diode channels have digital averaging disabled. The temperature data is the last

measured data.

Bits 3-2 - QUEUE[1:0] - Determines the number of consecutive out of limit conditions that are

necessary to trigger an interrupt. Each measurement channel has a separate fault queue associated

with the high limit, low limit, and diode fault condition.

APPLICATION NOTE: If the fault queue for any channel is currently active (i.e. an out of limit condition has been

detected and caused the fault queue to increment) then changing the settings will not take

effect until the fault queue is zeroed. This occurs by the ALERT pin asserting or the out of

limit condition being removed.

Bit 1 - 0 - CONV[1:0] - determines the conversion rate of the temperature monitoring. This conversion

rate does not affect the fan driver. The supply current from VDD_3V is nominally dependent upon the

conversion rate and the average current will increase as the conversion rate increases.

The Configuration 2 Register is software locked.

Table 7.18 Fault Queue

QUEUE[1:0]

NUMBER OF CONSECUTIVE OUT OF LIMIT CONDITIONS

1 (disabled)

4 (default)

Table 7.19 Conversion Rate

CONV[1:0]

CONVERSION RATE

1 / sec

2 / sec

4 / sec (default)

Continuous

EMC2113 Datasheet(PDF) 52 Page - SMSC Corporation