Texas Instruments LMH0318 Programmer's Manual page 18

Device Configuration
4.2.14 Signal Quality Alert HEO Interrupt Threshold
The LMH0318 can be optioned to cause interrupt if HEO goes below certain threshold and reg 0x56[3] =
1'b. The LMH0318 compares HEO value, reg 0x27[7:0], vs threshold setting of reg 0x32[7:4]*4. Note:
Register 0x54[7:0] indicates source of interrupt. Also, reg 0x FF[5] needs to be set to enable interrupt on
to LOS pin.
RAW FF 04
RAW 11 00
RAW 32 60
RAW 56 08
RAW FF 20
RAW 0A 0C
RAW 0A 00
4.2.15 Signal Quality Alert VEO Threshold Settings
Similar to HEO setting, the VEO can also be programmed to cause if VEO drops below a threshold.
RAW FF 04
RAW 11 00
RAW 32 06
RAW 56 04
RAW FF 80
RAW 0A 0C
RAW 0A 00
18
LMH0318 Programming Guide
07 //Select Channel Registers
20 //Enable EOM
F0 //Set HEO interrupt threshold level: 6*4 = 24/64 = .37 If HEO drops below
0.37UI enable interrupt
08 //Enable HEO/VEO Signal Quality Alert interrupt
20 //Enable interrupt onto LOS pin
0C //Reset CDR
0C //Release CDR Reset so changes will go into effect
07 //Select Channel Registers
20 //Enable EOM
0F //Set VEO interrupt threshold level: 6*4*3.125 = 75mV If VEO drops below 75
mV enable interrupt
08 //Enable HEO/VEO Signal Quality Alert interrupt
20 //Enable interrupt onto LOS pin
0C //Reset CDR
0C //Release CDR Reset so changes will go into effect
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SNLU183 – September 2015
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