EMC2302 datasheet(29/70 Pages) MICROCHIP

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DS20006532A-page 29

EMC2301/2/3/5

6.2

Configuration Register

The Configuration register controls the basic function-

ality of the EMC2301/2/3/5. The Configuration Register

is software locked.

CONFIG - CONFIGURATION REGISTER (ADDRESS 20H)

R-0

MASK

DIS_TO

WD_EN

—

DRECK

USECK

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7

MASK: Blocks the ALERT pin from being asserted

1 = The ALERT pin is masked and will not be asserted.

0 = The ALERT pin is unmasked. If any bit in the status registers is set, the ALERT pin will be asserted

(unless individually masked via the Fan Interrupt Enable Register).

bit 6

DIS_TO: Disables the SMBus Time-Out function for the SMBus client (if enabled)

1 = The SMBus Time-Out function is disabled, allowing the device to be fully I2C compatible.

0 = The SMBus Time-Out function is enabled.

bit 5

WD_EN: Enables the Watchdog Timer (see Section 4.11 “Watchdog Timer”) to operate in

Continuous Mode

1 = The Watchdog Timer operates continuously.

0 = The Watchdog Timer does not operate continuously. It will function upon power-up and at no other

time.

bit 4-2

Unimplemented bits, read as ‘0’.

bit 1

DRECK: Enables the internal tachometer clock to be driven out on the CLK pin so that multiple devices

can be synced to the same source

1 = The CLK pin acts as a clock output and is a push-pull driver.

0 = The CLK pin acts as a clock input.

bit 0

USECK: Enables the EMC2301/2/3/5 to use a clock present on the CLK pin as the tachometer clock.

If the DR_EXT_CLK bit is set, then this bit is ignored and the device will use the internal oscillator.

1 = The EMC2301/2/3/5 will use the oscillator presented on the CLK pin for all tachometer

measurements.

0 = The EMC2301/2/3/5 will use its internal oscillator for all tachometer measurements.

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