AK2570 Просмотр технического описания (PDF) - Asahi Kasei Microdevices

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производитель

AK2570

Feed Forward APC LSI for LD Module

Asahi Kasei Microdevices 

ASAHI KASEI

[AK2570]

(2) Training mode

“Training mode” is used for the evaluation and the adjustment about AK2570. It is possible to write and read

the data in the EERPOM and the registers and to execute activating the internal circuit for setting the

temperature compensation data with the serial interface. Notice that it is possible to shift to “Training mode”

by executing ‘Command for Training mode’ and any other command is not available while operating in

“Self-operation mode”.

After executing ‘Command for Training mode’, it is necessary to input the clock or the ‘H’ level signal to

SK-pin continuously to keep the operational mode is in “Training mode“. It is able to return to “Self-

operational mode” by forcing the ‘L’ level signal to SK-pin for 50msec more in “Training mode”.

In “Training mode”, the periodical operation of temperature compensation for the LD is stopped. Also at the

time of executing ‘Command for Training mode’ while operating in “Self-operational mode”, AK2570

transfers to “Training mode” after completing the periodical operation.

Recommended sequence in ”Training mode

START

Set the temperature at the minimum value for the use (e.g. -40℃ )

Execute 'Command for Training mode' --> Initial setting : Command for Training mode

Write '00000' in RINT register --> Register access : WRITE-REG(RINT)

Add '+1' to the data

in RINT register

--> Register access

WRITE-REG(RINT) Nｏ

AD2 executes A to D conversion --> Initial Setting : Command for Selecting AD2

for the T-SENSE output

--> Activating Internal Circuit :

Command for A/D operation

Confirm the code generated by AD2

is '00000010'~'00001000' (e.g. -40℃ )

--> Register Access : READ-REG(RTMP)

Yｅｓ

(See p.15)

Change the

ambient temperature

--> Register access :

READ-REG(RTMP)

Nｏ

Set the data for DA1 & DA2 that will be retained in --> Register Access : WRITE-REG(RDA1)

EDA1 &EDA2 to fit the LD characteristics

--> Register Access : WRITE-REG(RDA2)

--> Evaluation for the LD characteristics

After execting the A to D conversion in AD1 for

the input voltage to VPDIN-pin, read the data in

RVPD register that will be retained in EDA3

--> Adjusting the monitoring PD

--> Initial Setting : Command for Selecting AD1

--> Activating Internal Circuit :

Command for A/D operation

--> Register Access : READ-REG(RVPD)

Complete the measurement for the compensation data

Yｅｓ

Make the data for writing in the EEPROM

Write the compensatory data in the EEPROM

--> EEPROM Access : EWEN

--> EEPROM Access : WRITE-EEP

FINISH

<MS0115-E-00>

7

2001/10

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