AK2570 데이터 시트보기 (PDF) - Asahi Kasei Microdevices
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AK2570 Datasheet PDF : 27 Pages
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ASAHI KASEI
[AK2570]
FUNCTIONAL DESCRIPTION
1. Explanation for the ‘mode’
AK2570 has the 2 operational modes, “Self-operation mode” and “Training mode”.
After executing the evaluation and the adjustment for the LD module including AK2570 in “Training mode”, it
is possible to use AK2570 ordinarily in “Self-operation mode” for compensating the temperature drift of the LD
module.
“Self-operation mode” is the ordinary operational mode. If the ambient temperature drifts, AK2570 can
maintain the emission intensity of the LD module constant by executing the APC operation, i.e. controlling the
Bias- and the Modulation- current for the LD module, periodically (the compensation period is about 100msec)
in “Self-operation mode”. (See p.6) On the other hand, in “Training Mode”, it is possible to evaluate and adjust
AK2570 and the LD module by the access to the data in the EEPROM and the registers. (See p.7)
[a] Constitution of the mode and the command
Self-operation mode
[Note1]
[Note2]
Training mode
Initial setting
Activating internal circuit
Register access EEPROM access
Command for Self-operation mode
Command for Training mode
Command for Selecting AD1
Command for Selecting AD2
Command for A/D operation
Command for Resetting data in RDA1-3
READ-REG
WRITE-REG
EWEN
EWDS
WRITE-EEP
READ-EEP
[Note 1] While operating in “Self-operation mode”, it is possible to shift to “Training mode” by executing
‘Command for Training mode’ and this is the only available command. That is to say that any other
command is not effective in “Self-operation mode”.
[Note 2] On the other hand, while operating in “Training mode”, it is possible to shift to “Self-operation mode”
by executing ‘Command for Self-operation mode’ or forcing the ‘L’ level signal to SK-pin for 50ms
more and AK2570 shifts to “Self-operation mode” with behaving as same as the operation at ‘Power
ON’.
<MS0115-E-00>
5
2001/10
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