ds1878 Maxim Integrated Products, Inc., ds1878 Datasheet - Page 71

• Manufacturer Part Number: ds1878
• Description: Sfp+ Controller With Digital Ldd Interface
• Manufacturer: Maxim Integrated Products, Inc.

Table 02h, Register B9h: COMP RANGING
B9h
FACTORY DEFAULT
READ ACCESS
WRITE ACCESS
MEMORY TYPE
The upper nibble of this byte controls the full-scale range of the quick-trip monitoring for BIAS. The lower nibble of
this byte controls the full-scale range for the quick-trip monitoring of the APC reference as well as the closed-loop
monitoring of APC.
SFP+ Controller with Digital LDD Interface
RESERVED
BITS 6:4
BITS 2:0
BIT 7
BIT 7
BIT 3
______________________________________________________________________________________
RESERVED (Default = 0)
BIAS[2:0]: BIAS Full-Scale Ranging. 3-bit value to select the FS comparison voltage for BIAS found
on MON1. Default is 000b and creates an FS of 1.25V.
RESERVED (Default = 0)
APC[2:0]: APC Full-Scale Ranging. 3-bit value to select the FS comparison voltage for MON2 with
the APC. Default is 000b and creates an FS of 2.5V.
BIAS
BIAS[2:0]
APC[2:0]
2
000b
001b
010b
011b
100b
101b
110b
111b
000b
001b
010b
011b
100b
101b
110b
111b
00h
PW2
PW2
Nonvolatile (SEE)
BIAS
1
% OF 1.25V
% OF 2.50V
100.00
100.00
BIAS
80.00
66.67
50.00
40.00
33.33
28.57
25.00
80.00
66.67
50.00
40.00
33.33
28.57
25.00
0
RESERVED
FS VOLTAGE (V)
FS VOLTAGE (V)
1.250
1.000
0.833
0.625
0.500
0.417
0.357
0.313
2.500
2.000
1.667
1.250
1.000
0.833
0.714
0.625
APC
2
APC
1
APC
BIT 0
0
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