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| MIC3000 Datasheet, PDF (14/68 Pages) Micrel Semiconductor – SFP Management IC | |||
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MIC3000
Block Diagram
TXFAULT
TXDISABLE
RSIN
RSOUT
RXLOS
INT
CLOCK
DATA
MIC3000
I2C
STATE-
MACHINES
TIMING
APC
MODULATION
CONTROL
MEMORY
ARBITRATION
FAULT DETECTION
NVRAM
REGISTERS
SERIAL ID
SCRATCH
LUTs
LASER
CONTROL
A-D CONVERTER
&
SIGNAL
CONDITIONING
POWER-ON
HOUR METER
CLOCK
&
POR
TEMP
SENSOR
Figure 1. MIC3000 Block Diagram
Micrel
VBIAS
COMP
FB
VMOD+
VMODâ
SHDN
VILD+
VILDâ
VMPD
VIN
VRX
XPN
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 MIC3000
are sampled in sequence. All five parameters are sampled
and the results updated within the tCONV internal given in the
âElectrical Characteristicsâ section. In OEM Mode, the chan-
nel that is normally used to measure VIN may be assigned to
measure the level of the VDDA pin or one of five other nodes.
This provides a kind of analog loopback for debug and test
purposes. The VAUX bits in OEMCFG0 control which voltage
source is being sampled. The various VAUX channels are
level-shifted differently depending on the signal source, re-
sulting in different LSB values and signal ranges. See Table
5.
M9999-101204
14
October 2004
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