参数资料
| 型号： | DS1874T+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 28/88页 |
| 文件大小： | 0K |
| 描述： | IC CTLR SFP+ ANLG LDD 28-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 类型： | 激光二极管控制器 |
| 通道数： | 1 |
| 电源电压： | 2.85 V ~ 3.9 V |
| 电流 - 电源： | 2.5mA |
| 工作温度： | -40°C ~ 95°C |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
| 包装： | 管件 |
| 安装类型： | 表面贴装 |
| 其它名称： | 90-1874T+000 |
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SFP+ Controller with Digital LDD Interface
TYPICAL I 2 C WRITE TRANSACTION
MSB
LSB
MSB
LSB
MSB
LSB
START
1
0
1
0
0
0
1
R/W
SLAVE
ACK
b7
b6
b5
b4
b3
b2
b1
b0
SLAVE
ACK
b7
b6
b5
b4
b3
b2
b1
b0
SLAVE
ACK
STOP
SLAVE
ADDRESS*
READ/
WRITE
REGISTER ADDRESS
DATA
*IF ASEL IS 0, THE SLAVE ADDRESS IS A0h FOR THE AUXILIARY MEMORY AND A2h FOR THE MAIN MEMORY.
IF ASEL = 1, THE SLAVE ADDRESS IS DETERMINED BY TABLE 02h, REGISTER 8Ch FOR THE MAIN MEMORY. THE AUXILIARY MEMORY CONTINUES TO BE ADDRESSED AT A0h, EXCEPT WHEN THE PROGRAMMED
ADDRESS FOR THE MAIN MEMORY IS A0h.
EXAMPLE I 2 C TRANSACTIONS WITH A2h AS THE MAIN MEMORY DEVICE ADDRESS
A2h
BAh
00h
A) SINGLE-BYTE WRITE
-WRITE 00h TO REGISTER BAh
START 1 0 1 0 0 0 1 0
SLAVE
ACK
10111010
SLAVE
ACK
00000000
SLAVE
ACK
STOP
A2h
BAh
A3h
DATA
START 1 0 1 0 0 0 1 0 SLAVE 1 0 1 1 1 0 1 0 SLAVE
1 0 1 0 0 0 1 1 SLAVE
B) SINGLE-BYTE READ
-READ REGISTER BAh
ACK ACK
REPEATED
START
ACK
DATA IN BAh
MASTER
NACK
STOP
C) TWO-BYTE WRITE
-WRITE 01h AND 75h
TO C8h AND C9h
A2h
START 1 0 1 0 0 0 1 0
SLAVE
ACK
C8h
11001000
SLAVE
ACK
01h
00000001
SLAVE
ACK
75h
01110101
SLAVE
ACK
STOP
A2h
C8h
A3h
DATA
DATA
D) TWO-BYTE READ
-READ C8h AND C9h
START 1 0 1 0 0 0 1 0
SLAVE
ACK
11001000
SLAVE
ACK
REPEATED
START
10100011
SLAVE
ACK
DATA IN C8h
MASTER
ACK
DATA IN C9h
MASTER
NACK
STOP
Figure 18. Example I 2 C Timing
cycle. This can result in a whole page being worn out
over time by writing a single byte repeatedly. Writing
a page one byte at a time wears the EEPROM out
eight times faster than writing the entire page at
once. The DS1874’s EEPROM write cycles are speci-
fied in the Nonvolatile Memory Characteristics table.
The specification shown is at the worst-case temper-
ature. It can handle approximately ten times that
many writes at room temperature. Writing to SRAM-
shadowed EEPROM memory with SEEB = 1 does not
count as an EEPROM write cycle when evaluating
the EEPROM’s estimated lifetime.
Reading a single byte from a slave: Unlike the
write operation that uses the memory address byte
to define where the data is to be written, the read
operation occurs at the present value of the memory
address counter. To read a single byte from the
slave, the master generates a START condition,
writes the slave address byte with R/ W = 1, reads
the data byte with a NACK to indicate the end of the
transfer, and generates a STOP condition.
Manipulating the address counter for reads: A
dummy write cycle can be used to force the address
pointer to a particular value. To do this, the master
generates a START condition, writes the slave
address byte (R/ W = 0), writes the memory address
where it desires to read, generates a repeated
START condition, writes the slave address byte (R/ W
= 1), reads data with ACK or NACK as applicable,
and generates a STOP condition.
Memory Organization
The DS1874 features nine separate memory tables that
are internally organized into 8-byte rows.
The Lower Memory is addressed from 00h to 7Fh and
contains alarm and warning thresholds, flags, masks,
several control registers, password entry area (PWE),
and the table-select byte.
Table 01h primarily contains user EEPROM (with PW1
level access) as well as alarm and warning-enable
bytes.
Table 02h is a multifunction space that contains config-
uration registers, scaling and offset values, passwords,
interrupt registers as well as other miscellaneous con-
trol bytes.
Table 04h contains a temperature-indexed LUT for
control of the modulation voltage. The modulation LUT
can be programmed in 2°C increments over the -40°C
to +102°C range.
28
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相关代理商/技术参数 |
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|---|---|
| DS1874T+ | 功能描述:ADC / DAC多通道 SFP+ Controller w/ Dgtl LDD Interface RoHS:否 制造商:Texas Instruments 转换速率: 分辨率:8 bit 接口类型:SPI 电压参考: 电源电压-最大:3.6 V 电源电压-最小:2 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-40 |
| DS1874T+T&R | 制造商:Maxim Integrated Products 功能描述:SFP+ CONTROLLER WITH DIGITAL LDD INTERFACE - Tape and Reel 制造商:Maxim Integrated Products 功能描述:MXMDS1874T+T&R SFP+ CTRLR FOR USE W/MAX3 制造商:Maxim Integrated Products 功能描述:IC CTLR SFP+ ANLG LDD 28-TQFN |
| DS1874T+T&R | 功能描述:ADC / DAC多通道 SFP+ Controller w/ Dgtl LDD Interface RoHS:否 制造商:Texas Instruments 转换速率: 分辨率:8 bit 接口类型:SPI 电压参考: 电源电压-最大:3.6 V 电源电压-最小:2 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-40 |
| DS1874T+TR | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:SFP+ Controller with Digital LDD Interface |
| DS1875 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:PON Triplexer and SFP Controller |
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