Micrel
TXRX_982_R1 Evaluation Board
Set-Up and Operation
Follow the step-by-step procedure to set-up the board
safely and properly:
1. Connect the on board DB-25 connector to the
parallel port of a computer.
2. Connect the differential input of the laser
driver to DATA output of the pattern generator.
3. Use a multimode fiber jumper, with
appropriate connectors to connect optical
output of the VCSEL to a VOA (variable
optical attenuator) preset to 0dB attenuation.
4. Connect the output of the VOA to the optical
input of the DCA, power-meter, or optical to
electrical converter.
5. Pre-adjust the power supply to 3.3V and turn it
off. Connect TP3 to V
CC
(3.3V) and TP5 to
GND, then turn the power supply ON. The
total current drawn from the power supply
should be less than 300mA.
6. Launch the MIC3000/1 software. The
MIC3001 Optical Transceiver Management
IC
panel opens with
Panels
and
Help
grayed
out and only
Utilities
can be run.
7. Refer to MIC3000/1 Software User’s Guide for
the detailed settings.
8. On the main window select
Utilities
to open
the utilities panel, then select
SCAN
to read
the address of the MIC3001 and
GET
to read
the manufacturer ID, Device ID, and Die
Revision. If there is a failure in reading one of
these parameters, you cannot proceed further.
If all the parameters are read correctly, close
the
Utilities window
to return to the main
window where
Panels
and
Help
are no longer
grayed out.
9. Select
Panels
to display the list of setting
panels.
10. All the bits displayed on the panels can be
read and/or modified on the panels or by
accessing the registers directly by selecting
ALL REGISTERS,
enter the serial address,
the register address, select
GET
to read the
content or type a value and select
SET NEW
to write. In this procedure the bits are set on
the panels.
11. Select
OEM CONFIG 0-2
to open the OEM
configuration registers 0, 1, and 2 windows.
12. In
OEM Configuration Register 0
window,
set
ENABLE/DISABLE
to DISABLE,
VMOD
REFERENCE to GND,
and
temperature
zone
to
INTERNAL.
13.
In
OEM Configuration Register 1
window:
a. Set
APC OP-AMP TYPE
to
COMMON
EMITTER.
Note: Set the selection bit to 0, 0 should correspond
to EMITTER FOLLOWER, which should be displayed
on the bottom and COMMON EMITTER on the top.
b. Select the voltage to report in
VINH:VINL.
c.
Set Feedback voltage source to 1.22V.
d. Set
FEEDBACK BIAS REF and RES
TERMINATION to GND
and
VBIAS
DRIVE
to
SOURCE
(NPN). Set
INTERNAL FEEDBACK RESISTOR
to
an arbitrary value (1.6K for example).
e. Set
FEEDBACK BIAS REF and RES
TERMINATION
to
GND
and
VBIAS
DRIVE
to
SOURCE
(NPN).
f.
Set
INTERNAL FEEDBACK
RESISTOR
to arbitrary value (1.6K for
example).
14. In
OEM Configuration Register 2,
the
MIC3001 address and look-up table offset can
be modified. The look-up table covers 128°C.
The temperature range for offset = 0 is 0° to
+127°C.) This range can be shifted down by
2x the value. The offset is set to. If offset = 15,
the temperature range becomes –30° to
+97°C.
15. In
OEM Configuration Register 0
window,
set
ENABLE/DISABLE
to
ENABLE.
16. On
Panels
list select
OEM CONFIG 3-4
and
select
EXTERNAL CALIBRATION
(default
setting),
LOS COMPARATOR ENABLE,
SHDN, RXLUT INPUT TEMPERATURE, and
RSOUT.
If needed, later set
ISTART
to a
different value to speed up the APC loop
during laser turn ON after a FAULT
occurrence. Close the window to return to
main window.
17. On
Panels
list, select
External Calibration.
Set all the
offsets
to 0 and
slopes
to 1. Set
RX_PWR(1)
to 1. These parameters might
need to be changed later to correct the
measured values (calibration). Return to the
main window.
September 2004
3
M9999-092304
hbwhelp@micrel.com
or (408) 955-1690
MICREL [ MICREL SEMICONDUCTOR ]
