ak2574 AKM Semiconductor, Inc., ak2574 Datasheet - Page 26

• Manufacturer Part Number: ak2574
• Description: 156m Laser Diode Driver Apc For Burst Mode
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
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)
Note 1:
Table 5-7 Register Map
<MS0266-E-00>
Address
R_V REFTRIM[7:4]
R_TEMP_OFFSET
[3:0]
R_TXDIS_POL[2]
R_TX ACT_POL[1]
R_CLKALM_POL[0] 01h
R_DAC_TXA CT[2:0]
R_TX ACT_THRU[0]
R_DAC1[7:0]
R_DAC2[7:0]
R_DUTY[4:0]
R_MODE[3:0]
R_TEMP[6:0]
AKM Test
Register
0Dh –
0Ah
0Bh
0Ch
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
13h
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.
D7
Address Function
00h
00h
01h
01h
02h
04h
05h
06h
07h
08h
0Ch
0Dh -
D6
VREFTRIM
13h
TXDIS Polarity
TXA CT Polarity
CLKALM Polarity
DAC(TX ACT)
TXA CT Hold
I-DAC1 Current Setting
I-DAC2 Current Setting
Duty Adjustment
Detected Temperature
Test for AKM
(Reserved)
Oscillator Frequency
Temperature sensor offset 4
Operation Mode Status
D5
D4
(AKM Test)
Reserved
-26-
DAC1
DAC2
TEMP
Bit R/W
4
1
1
1
3
1
8
8
5
4
7
D3
(Note 1)
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
R
NA
TXDIS_
DUTY
POL
D2
TEMP_OFFSET
Remark
see Table 3-2
0: TXACT Hold
1: TXACT (Real-Time)
see Table 6-3
see Table 2-8
Reserved
0: Shutdown at “H”
1: Shutdown at “ L”
0: “ H” at TXACT detection
1: “ L” at TXACT detection
0: “ H” at CLKALM detection
1: “ L” at CLKALM detection
see Table 2-5
see Table 2-6
see Table 2-4
MODE
(Normal Operation)
DAC_TX ACT
TXA CT_
POL
D1
CLKALM_
[AK2574]
TXA CT_
THRU
2003/12
POL
D0