MIC3003 datasheet(63/75 Pages) MICREL

63 / 75 page

Micrel, Inc.

MIC3003

November 2009

M9999-111209-C

hbwhelp@micrel.com or (408) 955-1690

Bit

Function

Operation

D[7]

Reserved

Always write as zero; reads undefined.

D[6]

FLTDIS

Fault Comparator disable

0 = Fault Comparator faults enabled

1 = Fault Comparator faults disabled

When FLTDIS is high, the Fault Comparator does not run,

and the following faults are not detected:

•

High IBIAS faults

•

High transmit power faults

•

Low receive power faults

If a fault condition was detected prior to the assertion of

FLTDIS, the fault flag will remain active until cleared, but

cannot be set again until the Fault Comparator is allowed

to run.

D[5]

FSPIN

Fault Comparator “spin-on-channel” mode

select; do not enable ADC and FC spin-

on-channel modes simultaneously.

0 = Normal Fault Comparator operation

1 = Force the Fault Comparator to spin on one channel

When the Fault Comparator spins on just one channel

(selected via OEMCAL1[1:0]), the two channels not being

examined will not, of course, respond to fault conditions.

D[4]

WRINH

Inhibit NVRAM write cycles.

0 = Normal NVRAM operation

1 = Inhibit NVRAM writes

When WRINH is high, writes to the MIC3003’s internal

memory do not occur. Registers that are non-volatile are

written with the new value, but will not retain that value

through a power cycle, since the NVRAM backing storage

has not been modified.

D[3]

APCCAL

Selects APC DAC calibration mode -

DACs may be controlled directly.

0 = Normal mode

1 = DAC calibration mode.

When DAC calibration mode is enabled, the temperature

compensation lookup tables are disabled, so the DACs

are presented with the values written into their

corresponding registers.

D[2:1]

Reserved

Always write as zeros; reads undefined.

D[0]

FRCOPS

Forces outputs for board-level or system-

level testing

0 = Normal operation

1 = Force outputs for testing: The following outputs are

driven to their active states:

•

TXFAULT (active polarity set in OEMCFG5)

•

/INT (only driven if the OEMIM bit is clear in

FLTMSK)

•

RXLOS (active polarity and RXLOS selection are

set in OEMCFG6)

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