AK2572 Datasheet, PDF (42/50 Pages) Asahi Kasei Microsystems – APC for Burst Mode Applicable Direct Modulation Laser Diode

ASAHI KASEI
[AK2572]
Table 9-6 Register Configuration (Continued)
Register Address
Function
Bit Form R/W
Note
R_TEMP [7:0]
10h
Temperature equivalent value
(AD code of temperature sensor)
8
U
R_TEMP
_STDW [7:0]
14h
Temperature equivalent value at
just before Shutdown request
8
U
R_TXFLT_ST
[4:0]
19h
Alarm status
5U
R
Refer to Table 4-10
R
Refer to Section 7.2 and
Table 4-10
1: Active, 0: Inactive
[4] TEMPALM
R
[3] EXTALM2
[2] EXTALM1
[1] CURRALM
[0] OPTALM
R_DAC1 [7:0] 1Bh
I-DAC1 value
8U R
[*3]
R_DAC2 [7:0] 1Ch
I-DAC2 value
8U R
[*3]
R_DAC3 [7:0] 1Dh
V-DAC3 value
8U R
[*3]
R_APC_FB [7:0] 1Eh
APC_FB value
R_MODE [2:0] 1Fh
Operation mode
AKM test
28h~2Bh
2Eh
R_PWR
_SEL [1:0]
2Fh
For AKM test
EEPROM data switching at
Power Leveling [2]
8S
3U
－－
R
[7]Sign of APC_FB [*2]
[6:0] Upper 7bits of APC_FB
001:Self-Operation Mode
R 010:Adjustment Mode
100:EEPROM Access Mode
－
2 U R/FW Refer to Table 5-2 [*1]
［*1］ Finally modified value in either R_PWR_SEL [7:6] (R/W) at address “01h” or R_PWR_SEL [1:0] (R/FW) at
address “2Fh” becomes valid R_PWR_SEL set value and is updated and retained in R_PWR_SEL at both
address locations. And with R_PWR_LVL1_SET＝“0” and R_PWR_LVL2_SET＝“1”, Power Leveling[2] is
available and write in Self-Operation Mode can be executable only to R_PWR_SEL [1:0] (R/WF) at address
“2Fh” when Write Protect operation is released.
ï¼»*2ï¼½ Data configuration is shown in Figure 9-9. Register is configured with the signed 9 bits data, but Read /
Write operation via Digital I/F is processed in 8 bits configuration.
ï¼»*3ï¼½ In Bias current setting DAC and Modulation current setting DAC, Digital code for DAC is given as following
equation and negative value at R_DACx is set to “0”.
R_DACx＝R_DACx_FF＋R_DACx_FB (x＝1 ~ 3)
Figure 9-9 Signed Register Configuration
Register (9 bits 2's complement)
Sign
Body (8 bits)
D8 D7 D6 D5 D4 D3 D2 D1 D0
Read data via Digital I/F (R_APC_FB)
(Sign + Body [MSB 7 bits])
Write data via Digital I/F （R_APC_FBIV）
(Body 8 bits, Negative value cannot be written
-42-
< MS0290-E-01>
2004/8