參數(shù)資料
型號： DS1878T+T
廠商： Maxim Integrated Products
文件頁數(shù)： 22/101頁
文件大小： 0K
描述： IC CTLR SFP W/DGTL LDD RX 28TQFN
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 2,500
類型： SFP+ 控制器
輸入類型： 模擬，數(shù)字
輸出類型： 數(shù)字
接口： I²C，LDD，串行
電流 - 電源： 2.5mA
安裝類型： 表面貼裝
封裝/外殼： 28-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 28-TQFN-EP（5x5）
包裝： 帶卷 (TR)
DS1878
SFP+ Controller with Digital LDD Interface
______________________________________________________________________________________
27
CSEL_OUT
SCLOUT
SDAOUT
CSEL_OUT
NOTE: SEE THE 3-WIRE DIGITAL INTERFACE SPECIFICATION TABLE FOR DETAILS. CSEL_OUT IMPLIES CSEL1OUT OR CSEL2OUT.
SCLOUT
SDAOUT
1
2
3
456
78
A6
9
10
11121314
15
0
1
2
3
456
789
10
11
12
13
14
15
0
A5
A4
A3
A2
A1
RWN
D7
D6
D5
D4
D3
D2
D1
D0
D7
D6
D5
D4
D3
D2
D1
D0
RWN
WRITE MODE
READ MODE
A0
A6
A5
A4
A3
A2
A1
A0
tL
tCH tCL
tL
tDS
tDH
tDS
tRS
tDH
tT
Figure 18. 3-Wire Timing
3-Wire Interface Timing
Figure 18 shows the 3-wire interface timing. Figure 19
shows the 3-wire state machine. See the
3-Wire Digital
Interface Specification table for more information.
DS1878 Master Communication
Interface
Normal Operation
The majority of the communications consist of bias
adjustments for the APC loop. After each temperature
conversion, the laser modulation setting must be updat-
ed. All registers are rewritten after every temperature
conversion. Status registers TXSTAT1 and TXSTAT2 are
read between temperature updates at a regular inter-
val, tRR (see the Analog Voltage Monitoring
Characteristics table). The results are stored in 3W
TXSTAT1 and 3W TXSTAT2 (Table 02h, FCh–FDh). Two
chip selects are provided: CSEL1OUT and CSEL2OUT.
In the case where a separate limiting amplifier and
laser driver are used, CSEL2OUT should be connected
to the limiting amplifier. CSEL2OUT is only active when
receiver-related registers are accessed. This minimizes
noise caused by the digital interface.
Manual Operation
The master interface is controllable using four registers in
the device: 3WCTRL, ADDRESS, WRITE, and READ.
Commands can be manually issued while the device is
in normal operation mode. It is also possible to suspend
normal 3-wire commands so that only manual operation
commands are sent (3WCTRL, Table 02h, Register F8h).
Initialization
During initialization, the device transfers all its 3-wire
EEPROM control registers to a Maxim laser driver and
limiting amplifier. The 3-wire control registers include
the following:
RXCTRL1
RXCTRL2
SETCML
SETLOS
TXCTRL
IMODMAX
IBIASMAX
SETPWCTL
SETTXDE
SETTXEQ
SETLOSTIMER
RXCTRL3
TXCTRL2
TXCTRL3
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