ak2573a AKM Semiconductor, Inc., ak2573a Datasheet - Page 35

• Manufacturer Part Number: ak2573a
• Description: 125m / 156m Laser Diode Driver Apc - Asahi Kasei Microsystems
• Manufacturer: AKM Semiconductor, Inc.

each operation mode and Table 9-2 shows the command to change operation mode.
The AK2573A operation modes are changed through the I
Note: The I
Table 9-2 Operation mode change
When set WP = “ H” , only self-running mode is selected.
ASAHI KASEI
Fig 8-1 The data format of signed 9 bit register
9. Operation Mode
The AK2573A has 3 operating modes: Self-running, Adjustment and EEPROM mode.
9.1 Self-running Mode
Self-running mode is ready for normal operation after all adjustments are completed. In this mode, temperature
detection, EEPROM access and feeding current are automatically performed using the on-chip oscillator. The
AK2573A works in this mode after power-on.
9.2 Adjustment Mode
Adjustment mode is designed for training the LD characteristics. The AK2573A operates according to the register
9.3 EEPROM Mode
EEPROM mode is used for storing LD characteristics into EEPROM.
9.4 MODE Control
Table 9-1 Access limitation of each operation mode
9.5 Operation Mode Protection
<MS0189-E-01>
settings set through the I
Self-running mode
(WP=” L” )
Adjustment mode
(WP=” L” )
EEPROM mode
(WP=” L” )
WP = “ H”
Self-running mode only
Operation mode
Sign
D8
Device Address
1010100
1010100
1010100
2
C
D7
T M
interface access is prohibited for 1ms after power-on or mode transfer to self-running mode.
Read Data via Digital I/F (8 bit)
(Body 8bit, Negative Data can not be written)
D6
(Sign + Body (MSB 7bit)
Register (9bit 2's complement)
Write Data via Digital I/F (8 bit)
2
C
D5
TM
R/W
W
W
W
I/F. During adjustment mode, R_SFP should be 0.
(User Area Only)
D4
Body (8bit)
Read
-
-
-
-
Address
11111111
11111111
11111111
EEPROM Access
D3
D2
D1
Write
.
.
-
.
Data
10100000
10100111
10101110
2
D0
C
TM
-35-
interface. Table 9-1 shows the access limitation of
Read
-
-
-
.
Operation mode
Self-running mode
Adjustment mode
EEPROM mode
(except mode-change command)
(except mode-change command)
Register Access
Write
.
-
.
.
[AK2573A]
2004/5