MIC3001 Datasheet, PDF (15/74 Pages) Micrel Semiconductor – SFP Management IC with Internal Calibration

MIC3001
Block Diagram
TXFAULT
TXDISABLE
RSIN
RSOUT(GPO)
RXLOS
INT
CLOCK
DATA
MIC3001
I²C
STATE-
MACHINES
TIMING
APC
MODULATION
CONTROL
MEMORY
ARBITRATION
FAULT DETECTION
NVRAM
REGISTERS
SERIAL ID
SCRATCH
LUTs
LASER
CONTROL
A-D CONVERTER
&
SIGNAL
CONDITIONING
Micrel
VBIAS
COMP
FB
VMOD+
VMOD–
SHDN(TXFIN)
VILD+
VILD–
VMPD
VIN
POWER-ON
HOUR METER
CLOCK
&
POR
RXPOT
TEMP
SENSOR
VRX
XPN
Figure 1. MIC3001 Block Diagram
MIC3000 Compatibility
In general, the MIC3001 is completely hardware and soft-
ware backward-compatible with the MIC3000. Every feature
available in the MIC3000 is still present in the MIC3001. New
features have, of course, been added. The following differ-
ences between the MIC3000 and MIC3001 would be evident
to host software:
1. Faults do not set alarm or warning bits as in the
MIC3000.
2. RXOPl at register address 69_h at serial address
x2_h now contains four bits of data rather than being
fixed at zero as in the MIC3000.
Analog-to-Digital Converter/Signal Monitoring
A block diagram of the monitoring circuit is shown below.
Each of the five analog parameters monitored by the MIC3001
are sampled in sequence. All five parameters are sampled
and the results updated within the t_CONV internal given in the
“Electrical Characteristics” section. In OEM Mode, the chan-
nel that is normally used to measure V_IN may be assigned to
measure the level of the V_DDA pin or one of five other nodes.
This provides a kind of analog loopback for debug and test
purposes. The V_AUX bits in OEMCFG0 control which voltage
source is being sampled. The various V_AUX channels are
level-shifted differently depending on the signal source, re-
sulting in different LSB values and signal ranges. See Table
5.
August 2004
15
M9999-082404