MIC3000 Datasheet, PDF (53/68 Pages) Micrel Semiconductor – SFP Management IC

MIC3000
Bit(s)
D[7]
INV
D[6]
GAIN
D[5]
BIASREF
D[4:2]
RFB[2:0]
D[1]
SRCE
D[0]
SPOL
Micrel
Function
Operation
Inverts the APC op-amp inputs. When set to “0”
the BIAS DAC output is connected to the “+”
input and FB is connected to the “–” input of the
op amp. Set to “0” to use the ADC feedback loop.
0 = emitter follower (no inversion);
1 = common emitter (inverted); read/write;
non-volatile.
Sets the feedback voltage range by changing the
APCDAC output swing; 0-V_REF for optical
feedback, 0-V_REF/4 for electrical feedback.
Selects whether FB and VMPD are referenced to
ground or V_DD and selects feedback resistor
termination voltage (V_DDA or GNDA).
Selects internal feedback resistance. (Resistors
will be terminated to VDDA or GNDA according
to BIASREF.)
1 = VREF/4 full scale;
0 = VREF full scale; read/write ;non-volatile.
1 = VDD; 0 = GND; read/write; non-volatile.
000 = ∞;
001 = 800Ω,
010 = 1.6kΩ,
011 = 3.2kΩ,
100 = 6.4kΩ,
101 = 12.8kΩ,
110 = 25.6kΩ,
111 = 51.2kΩ;
read/write; non-volatile.
V_BIAS source vs. sink drive.
1 = source (NPN),
0 = sink (PNP); read/write; non-volatile.
Polarity of shutdown output, SHDN, when active. 1 = high;
0 = low; read/write; non-volatile.
OEM Configuration Register 2 (OEMCFG2)
D[7]
I2CADR[3]
read/write
D[6]
I2CADR[2]
read/write
D[5]
I2CADR[1]
read/write
D[4]
I2CADR[0]
read/write
D[3]
LUTOFF
read/write
D[2]
LUTOFF
read/write
D[1]
LUTOFF
read/write
D[0]
LUTOFF
read/write
Default Value
1010 xxxx_b = xx_h (slave address = 1010xxx_b)
Serial Address
A6h = 1010011_b
Byte Address
2 = 02_h
CAUTION: Changes to I2CADR take effect immediately! Any accesses following a write to I2CADR must be to the
newly programmed serial bus address. A valid OEM password is required for access to this register. This register is
non-volatile and will be maintained through power and reset cycles.
Bit(s)
D[7:4] I2CADR[3:0]
D[3:0]
LUTOFF
Function
Upper four MSBs of the serial bus slave address;
writes take effect immediately.
LUT offset. LUTOFF is added to the result of the
digital temperature sensor to derive the table
index; writes take effect after reset.
Operation
Read/write; non-volatile.
Read/write; non-volatile.
October 2004
53
M9999-101204