Rainbow Electronics DS1876 - Manual (Page 50)

50 _____________________________________________________________________________________
DS1876
SFP Controller with Dual LDD Interface
Table 02h, Register 8Ch: RANGING 2
FACTORY DEFAULT 00h
READ ACCESS PW2 or (PW1 and RWTBL2) or (PW1 and RTBL2)
WRITE ACCESS PW2 or (PW1 and RWTBL2)
A2h AND B2h MEMORY Common A2h and B2h memory location
MEMORY TYPE Nonvolatile (SEE)
8Ch RESERVED HBIAS2 2 HBIAS2 1 HBIAS2 0 RESERVED TXP2 2 TXP2 1 TXP2 0
BIT 7 BIT 0
The upper nibble of this byte controls the full-scale range of the QT monitoring for BMON2. The lower nibble of
this byte controls the full-scale range for the QT monitoring for PMON2.
BITS 7, 3 RESERVED (default = 0)
BITS 6:4
HBIAS2 [2:0] : HBIAS2 full-scale ranging: 3-bit value to select the full-scale comparison voltage for
BMON2. Default is 000b and creates a full scale of 1.25V.
HBIAS2 [2:0] % OF 1.25V FS VOLTAGE (V)
000b 100.00 1.250
001b 80.03 1.000
010b 66.71 0.834
011b 50.07 0.626
100b 40.08 0.501
101b 33.41 0.418
110b 28.65 0.358
111b 25.08 0.314
BITS 2:0
TXP2 [2:0] : TXP2 full-scale ranging: 3-bit value to select the full-scale comparison voltage for
PMON2. Default is 000b and creates a full scale of 2.5V.
TXP2 [2:0] % OF 2.5V FS VOLTAGE (V)
000b 100.00 2.507
001b 80.03 2.006
010b 66.71 1.672
011b 50.07 1.255
100b 40.08 1.005
101b 33.41 0.838
110b 28.65 0.718
111b 25.08 0.629