Datasheet

LMH0303
SNLS285G –APRIL 2008–REVISED APRIL 2013 www.ti.com
Table 1. SMBus Registers (continued)
Address R/W Name Bits Field Default Description
05h R/W OUTPUTCTRL 7 RSVD 0 Reserved as 0. Always write 0 to this bit.
6 FLOSOF 0 Force LOS to always OFF in regard to its
effect on the output signal. This forces the
device into either the mute or “add offset”
state. The LOS bit in register 01h still reflects
the correct state of LOS.
0: LOS operates normally, muting or adding
offset as specified by the MUTE bit.
1: Muting or adding offset is always in place
as specified by the MUTE bit.
5 FLOSON 0 Force LOS to always ON in regard to its effect
on the output signal. This prevents the device
from muting or adding offset. The LOS bit in
register 01h still reflects the correct state of
LOS.
0: LOS operates normally, muting or adding
offset as specified in the MUTE bit.
1: Muting or adding offset never occurs.
4 LOSEN 0 Configures LOS to be combined with the
ENABLE functionality.
0: Only the PD bit and ENABLE pin affect the
power down state of the output drivers.
1: If the ENABLE pin is set to ground, it
powers down the output drivers regardless of
the state of LOS or the PD bit. With the
ENABLE pin set to V
CC
, LOS=0 will power
down the output drivers, and LOS=1 will leave
the power down state dependent on the PD
bit.
3 MUTE 0 Selects whether the device will MUTE when
loss of signal is detected or add an offset to
prevent self oscillation. When an input signal
is detected (LOS=1), the device will operate
normally.
0: Loss of signal will force a small offset to
prevent self oscillation.
1: Loss of signal will force the channel to
MUTE.
2:0 SDTFThresh 010 Sets the Termination Fault threshold for SDO,
when SD is set to SD rates (1). Combines
with SDTFThreshLSB in register 03h (default
for combined value is 0101).
06h R/W RSVD 7:0 RSVD 00000000 Reserved as 00000000. Always write
00000000 to these bits.
07h R/W RSVD 7:0 RSVD 00000000 Reserved as 00000000. Always write
00000000 to these bits.
08h R/W TEST 7:5 CMPCMD 000 Compare command. Determines whether the
peak value or the current value of the
Termination Fault counters is read in registers
0Ah and 0Bh.
000: Resets compare value to 00; registers
0Ah and 0Bh show current counter values.
Sets detection to look for MAX peak values.
001: Capture counter 0. Register 0Ah shows
peak value.
010: Capture counter 1. Register 0Bh shows
peak value.
011, 100: Reserved.
101: Resets compare value to 1Fh. Sets
detection to look for MIN peak values.
110, 111: Reserved.
4:0 RSVD 00000 Reserved as 00000. Always write 00000 to
these bits.
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