ASAHI KASEI

[AK2570]

<MS0115-E-00>

2001/10

7

(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'

Write '00000' in RINT register

AD2 executes A to D conversion

Confirm the code generated by AD2

Add '+1' to the data

Nｏ

Set the data for DA1 & DA2 that will be retained in

After execting the A to D conversion in AD1 for

Complete the measurement for the compensation data

Make the data for writing in the EEPROM

Write the compensatory data in the EEPROM

FINISH

Change the

Yｅｓ

Yｅｓ

Nｏ

--> Initial setting : Command for Training mode

--> Register access : WRITE-REG(RINT)

--> Initial Setting : Command for Selecting AD2

--> Activating Internal Circuit :

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

--> Register access

--> Register Access : WRITE-REG(RDA1)

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

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

--> EEPROM Access : WRITE-EEP

--> EEPROM Access : EWEN

--> Evaluation for the LD characteristics

--> Adjusting the monitoring PD

is '00000010'~'00001000' (e.g. -40℃ )

in RINT register

WRITE-REG(RINT)

ambient temperature

for the T-SENSE output

Command for A/D operation

EDA1 &EDA2 to fit the LD characteristics

RVPD register that will be retained in EDA3

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

--> Initial Setting : Command for Selecting AD1

--> Activating Internal Circuit :

Command for A/D operation

--> Register access :

READ-REG(RTMP)

(See p.15)