AS3953 datasheet(26/71 Pages) AMSOSRAM

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ams Datasheet

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[v1-05] 2019-Feb-15

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AS3953A − Detailed Description

Figure below defines the coding of the AS3953A reply

information field to Read EEPROM command, if command is

normally processed.

Figure 30:

Read EEPROM Reply (successful)

Figure below defines the coding of the AS3953A reply

information field to Read EEPROM command, in case of an

error.

Figure 31:

Read EEPROM Reply (error code)

Write EEPROM

The Write EEPROM command is used to write one EEPROM

word (32 bits). The request information field contains 6 bytes

• Command code byte (04h)

• Address of the word to be written

• Four bytes (32 bits) of data to be written

Figure below defines coding of Write EEPROM command

information field.

Figure 32:

Write EEPROM Command

The AS3953A reply contains one byte informing whether the

writing of EEPROM was executed or whether there was an error.

Prior to actual programming of data in EEPROM, the control

logic checks whether there is enough power available. This is

done by performing so called power check during which a

dummy EEPROM programming is started. If the power check

fails, EEPROM programming is not performed and an error code

is sent. The EEPROM programming is a time consuming

operation. Therefore, if the EEPROM programming is executed,

the AS3953A reply comes after 8ms typical.

90h

Data

1byte

4 to 32 bytes

Information Field

Comment

61h

Error (no diagnostic)

04h

Address of Word to be

Written

Data

1 byte

4 bytes

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