DS1863 Datasheet, PDF (59/62 Pages) Maxim Integrated Products – Burst-Mode PON Controller With Integrated Monitoring

Burst-Mode PON Controller
With Integrated Monitoring
Table 02h, Register BFh: MAX IBIAS
FACTORY DEFAULT:
READ ACCESS
WRITE ACCESS
00h
PW2
PW2
MEMORY TYPE:
Nonvolatile (SEE)
BFh
2¹²
2¹¹
2¹⁰
2⁹
2⁸
2⁷
2⁶
2⁵
bit7
bit0
This value will define the maximum DAC value allowed for the upper 8 bits of IBIAS output during all operations. During the initial step
and binary search, this value will not cause an alarm but will still clamp the IBIAS DAC output. After the startup sequence (or normal
APC operations), if the APC loop tries to create an IBIAS value greater than this setting, IBIAS is clamped, and creates a BIAS MAX
alarm. Settings 00h through FEh are intended for normal APC mode of operation. Setting FFh is reserved for manual IBIAS mode.
Table 02h, Register C0h to F7h: Empty
Table 02h, Register F8h–F9h: MAN IBIAS
FACTORY DEFAULT:
READ ACCESS
00h
PW2
WRITE ACCESS
PW2 and (BIAS-EN = 0)
MEMORY TYPE:
Volatile
F8h RESERVED RESERVED
2¹²
2¹¹
2¹⁰
2⁹
2⁸
2⁷
F9h
2⁷
2⁶
2⁵
2⁴
2³
2²
2¹
2⁰
bit7
bit0
When “BIAS-EN” (Table 02h, 80h) is written to 0, writes to these bytes will control the lower portion of the IBIAS DAC [7:0].
Table 02h, Register FAh: MAN_CNTL
FACTORY DEFAULT:
READ ACCESS
WRITE ACCESS
00h
PW2
PW2 and (BIAS-EN = 0)
MEMORY TYPE:
Volatile
FAh RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED RESERVED MAN_CLK
bit7
bit0
When “BIAS-EN” bit (Table 02h, 80h) is written to zero, bit zero of this byte will control the updates of the MAN IBIAS value to the
Bias output. The Values of MAN IBIAS should be written with a separate write command. Setting bit zero to a ‘1’ will clock the MAN
IBIAS value to the output DAC.
1. Write the MAN IBIAS value with a write command.
2. Set the MAN CLK bit to a ‘1’ with a separate write command.
3. Clear the MAN CLK bit to a ‘0’ with a separate write command.
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