MIC3001 Datasheet, PDF (64/74 Pages) Micrel Semiconductor – SFP Management IC with Internal Calibration

MIC3001
Bit(s)
D[7:4]
I_START[3:0]
Function
Reserved.
I_START current level selection:
0000 = No I_START current
0001 - 1111 = 0.375mA × I_START[3:0]
I_START is used to speed up the laser start-up
after a fault accures. The charging current
of the compensation cap starts from I_START
instead of ramping up from 0.
Operation
Reserved. Always write as zero; reads undefined.
Read/write; non-volatile.
Micrel
Power-On Hour Meter Data (POHDATA)
D[7]
read/write
D[6]
read/write
D[5]
read/write
D[4]
read/write
D[3]
read/write
D[2]
read/write
D[1]
read/write
D[0]
read/write
Default Value
0000 0000_b = 00_h
Serial Address
A6_h = 1010011_b
Byte Address
32-39 = 20_h - 27_h
These registers are used for backing up the POH result during power cycles. At power-up, the POH meter selects the
larger of the two values as the initial count. Incremental results are stored in alternate register pairs. The power-on
hour meter may be reset or preset by writing to these registers. These registers are non-volatile and will be maintained
through power and reset cycles. A valid OEM password is required for access to these registers.
BYTE
3
2
1
0
POHA, high-byte
POHA, low-byte
POHB, high-byte
POHB, low-byte
Weight
OEM Scratchpad Registers (SCRATCHn)
Default Value
0000 0000_b = 00_h
Serial Address
A6_h = 1010011_b
Byte Address
SCRATCH0: 126 = 7E_h
SCRATCH1: 127 = 7F_h
SCRATCH2: 128 = 80_h
.......................................
SCRATCH127: 253 = FD_h
The scratchpad registers are general-purpose non-volatile memory locations. They can be freely read from and written
to any time the MIC3001 is in OEM mode.
RX Power Look-up Table (RXLUTn)
Default Value
0000 0000_b = 00_h
Serial Address
A6_h = 1010011_b
Byte Address
40-71 = 28_h - 47_h
These registers are non-volatile and will be maintained through power and reset cycles. A valid OEM password is
required for access to these registers.
M9999-082404
64
August 2004