AK2574 Datasheet, PDF (24/30 Pages) Asahi Kasei Microsystems – 156M Laser Diode Driver + APC for Burst Mode

ASAHI KASEI
[AK2574]
5.2.6 Data Change
The SDA pin is normally pulled high with 4.7k to 10kΩ. Data on the SDA pin may change only during SCL low time
period. Data changes during SCL high periods will indicate a start or stop condition.
SCL
SDA
Data
Stable
Data
Change
5.2.7 Start / Stop Condition
Start Condition: A high-to-low transition of SDA with SCL high is a start condition that must precede any other
command.
Stop Condition: A low-to-high transition of SDA with SCL high is a stop condition.
SCL
SDA
START
STOP
5.3 EEPROM
EEPROM memory map is shown in Table 5-3, 5-4 and 5-5.
EEPROM access islimited with WP pin and Operation mode (refer to Table 6-1, for more information).
WP = “L”: Full access
WP = “H”: User area only with read only
(Note) The AKM factory adjusted data are stored in advance at address (Device Address = A6h, Address = 60h) for
the offset of the on-chip temperature sensor. If such excess temperature stress is to be applied to this device
which exceeds a guaranteed EEPROM data retention conditions ( for 10 years at 85℃), it is important to read
the pre-determined value in advance and to re-write the same data back into EEPROM after an exposure to
the excess temperature environment. Even if the exposure time is shorter than the retention time, any
accelerated temperature stress tests (such as baking) are performed, it is recommended to read the pre-set
data first and to re-write it after the tests.
<MS0266-E-00>
-24-
2003/12