4 – 62
Remote Operation
Weight
Bit
Flag
1
0
TEC ON
2
1
CT
/
CC
4
2
T STABLE
8
3
TUNING
16
4
IMAX
32
5
IMIN
64
6
VLIM
128
7
T FAULT
256
8
TMAX
512
9
TMIN
TEC ON : Set when the TEC current source is on.
CT
/
CC : Set when the TEC current source is in CT mode.
T STABLE : Set when the temperature is stable.
TUNING : Set when autotuning is in progress.
IMAX : Set when the output current is at the positive limit.
IMIN : Set when the output current is at the negative limit.
VLIM : Set when the TEC operating voltage is at or above the limit (see
TVLM
).
T FAULT : Set when the thermal sensor is disconnected
/
in fault.
TMAX : Set when temperature is above the maximum.
TMIN : Set when temperature is below the minimum.
4.6.5.1 TEC controller positive/negative transition (TEPT/TENT)
These two 16-bit wide registers control the mapping of transitions
in the TECR to setting flags in the TEEV register. For any particular
event, if the corresponding bit is set in TEPT, then a 0
→
1 transition
in the TECR causes the bit to be set in the TEEV. Likewise, if a bit is
set in TENT, then a 1
→
0 transition in the TECR causes the bit to be
set in the TEEV.
All combinations of TEPT and TENT settings are valid. At power-on,
both TEPT and TENT are cleared.
4.6.5.2 TEC controller event (TEEV)
This 16-bit wide register monitors selected events in the TECR, based
on transitions selected in TEPT and TENT. When the selected transi-
tion(s) occur, the corresponding bit is set. Reading the register clear
it (reading a single bit clears only that bit). This register is cleared by
the
*CLS
command.
LDC500 Series Laser Diode Controllers
