參數(shù)資料
型號(hào): DS1878T+T&R
廠商: Maxim Integrated Products
文件頁數(shù): 75/101頁
文件大?。?/td> 0K
描述: IC CTLR SFP W/DGTL LDD RX 28TQFN
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
______________________________________________________________________________________
75
Table 02h, Register BAh: ISTEPH
FACTORY DEFAULT
00h
READ ACCESS
PW2 or (PW1 and RWTBL246) or (PW1 and RTBL246)
WRITE ACCESS
PW2 or (PW1 and RWTBL246)
MEMORY TYPE
Nonvolatile (SEE)
BAh
28
27
26
25
24
23
22
21
BIT 7
BIT 0
ISTEP is the initial step value used at power-on or after a TXD pulse to control the BIAS register. The particular
ISTEP used depends on the value of TINDEX and ISTEPTI (Table 02h, Register C5h). When TINDEX > ISTEPTI,
ISTEPH is used. When TINDEX < ISTEPTI, ISTEPL is used. At startup, this value plus 20 = 1 is continuously added
to the BIAS register value until the APC feedback (MON2) is greater than its threshold. At that time, a binary
search is used to complete the startup of the APC closed loop. If the resulting math operation is greater than
IBIASMAX (Table 02h, Register EEh), the result is not loaded into the BIAS register, but the binary search is
begun to complete the initial search for APC. During startup, the BIAS register steps causing a higher bias value
than IBIASMAX do not create the BIAS MAX alarm. The BIAS MAX alarm detection is enabled at the end of the
binary search.
FACTORY DEFAULT
00h
READ ACCESS
PW2 or (PW1 and RWTBL246) or (PW1 and RTBL246)
WRITE ACCESS
PW2 or (PW1 and RWTBL246)
MEMORY TYPE
Nonvolatile (SEE)
BBh
28
27
26
25
24
23
22
21
BIT 7
BIT 0
See the ISTEPH register description.
Table 02h, Register BBh: ISTEPL
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