Instruction Manual

______________________________________________________________________________________ 55
DS1876
SFP Controller with Dual LDD Interface
Table 02h, Register B4h–B7h: PW2
Table 02h, Register B8h: RESERVED
Table 02h, Register B9h: HBIAS2 DAC
FACTORY DEFAULT FFFF FFFFh
READ ACCESS N/A
WRITE ACCESS PW2
MEMORY TYPE Nonvolatile (SEE)
B4h 2
31
2
30
2
29
2
28
2
27
2
26
2
25
2
24
B5h 2
23
2
22
2
21
2
20
2
19
2
18
2
17
2
16
B6h 2
15
2
14
2
13
2
12
2
11
2
10
2
9
2
8
B7h 2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
BIT 7 BIT 0
The PWE value is compared against the value written to this location to enable PW2 access. At power-on, the
PWE value is set to all ones. Thus, writing these bytes to all ones grants PW2 access on power-on without writing
the password entry. All reads of this register are 00h.
FACTORY DEFAULT
READ ACCESS N/A
WRITE ACCESS N/A
A2h AND B2h MEMORY N/A
MEMORY TYPE N/A
This register is reserved.
FACTORY DEFAULT 00h
READ ACCESS PW2 or (PW1 and RWTBL2) or (PW1 and RTBL2)
WRITE ACCESS (PW2 and QT2EN = 0) or (PW1 and RWTBL2 and QT2EN = 0)
A2h AND B2h MEMORY Common A2h and B2h memory location
MEMORY TYPE Volatile
B9h 2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
BIT 7 BIT 0
The digital value used for the HBIAS2 reference and recalled from Table 06h (Registers E0h–E7h) (transmitter 2) at
the adjusted memory address found in TINDEX. This register is updated at the end of the temperature conversion.
Comparisons greater than V
HBIAS2
compared against V
BMON2
create an HBAL alarm.
HBIAS2
Full Scale
V HBIAS2 DAC
256
= ×