DS1876 datasheet(55/69 Pages) MAXIM

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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

231

230

229

228

227

226

225

224

B5h

223

222

221

220

219

218

217

216

B6h

215

214

213

212

211

210

B7h

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

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 VHBIAS2 compared against VBMON2 create an HBAL alarm.

HBIAS2

Full Scale

HBIAS2 DAC

256

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