AK2574 Datasheet, PDF (26/30 Pages) Asahi Kasei Microsystems – 156M Laser Diode Driver + APC for Burst Mode

ASAHI KASEI
[AK2574]
5.4 Register
Register memory map is shown in Table 5-6 and 5-7. Register access is limited with WP pin and Operation mode
(refer to Fig 6-1, for more information).
Table 5-6 Register (Device Address = A8h)
Register
Address Function
Bit R/W Remark
(Note 1)
R_VREFTRIM[7:4] 00h
Oscillator Frequency
4 R/W
R_TEMP_OFFSET 00h
[3:0]
Temperature sensor offset 4 R/W
R_TXDIS_POL[2] 01h
TXDIS Polarity
1 R/W 0: Shutdown at “H”
1: Shutdown at “L”
R_TXACT_POL[1] 01h
TXACT Polarity
1 R/W
0: “H” at TXACT detection
1: “L” at TXACT detection
R_CLKALM_POL[0] 01h
CLKALM Polarity
1 R/W
0: “H” at CLKALM detection
1: “L” at CLKALM detection
R_DAC_TXACT[2:0] 02h
DAC(TXACT)
3 R/W see Table 3-2
R_TXACT_THRU[0] 04h
TXACT Hold
1 R/W 0: TXACT Hold
(Normal Operation)
1: TXACT (Real-Time)
R_DAC1[7:0]
05h
I-DAC1 Current Setting 8 R/W see Table 2-5
R_DAC2[7:0]
06h
I-DAC2 Current Setting 8 R/W see Table 2-6
R_DUTY[4:0]
07h
Duty Adjustment
5 R/W see Table 2-4
R_MODE[3:0]
08h
Operation Mode Status 4 R
see Table 6-3
R_TEMP[6:0]
0Ch
Detected Temperature 7 R
see Table 2-8
AKM Test
0Dh - Test for AKM
13h (Reserved)
NA
Reserved
Note 1:
R: Read Only.
R/W: Read/Write, Write data is hold unless re-writing or operation mode changing. All adjustment would be
done by R/W registers.
Table 5-7 Register Map
Address D7
00h
01h
D6
D5
VREFTRIM
02h
03h
04h
05h
06h
07h
08h
09h
0Ah
0Bh
0Ch
0Dh –
13h
D4
D3
DAC1
DAC2
D2
D1
D0
TEMP_OFFSET
TXDIS_ TXACT_ CLKALM_
POL
POL
POL
DAC_TXACT
TXACT_
THRU
DUTY
MODE
TEMP
Reserved
(AKM Test)
<MS0266-E-00>
-26-
2003/12