MIC3000BML datasheet(14/68 Pages) MICREL

14 / 68 page

MIC3000

Micrel

M9999-101204

October 2004

Block Diagram

APC

MODULATION

CONTROL

STATE-

MACHINES

TIMING

FAULT DETECTION

A-D CONVERTER

SIGNAL

CONDITIONING

LASER

CONTROL

MEMORY

ARBITRATION

I2C

DATA

XPN

VRX

VIN

VMPD

VILD–

VILD+

SHDN

VMOD–

VMOD+

COMP

VBIAS

CLOCK

INT

RXLOS

RSOUT

RSIN

TXDISABLE

TXFAULT

MIC3000

NVRAM

REGISTERS

SERIAL ID

SCRATCH

LUTs

POWER-ON

HOUR METER

CLOCK

POR

TEMP

SENSOR

Figure 1. MIC3000 Block Diagram

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

“Electrical Characteristics” 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

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