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參數資料
| 型號： | X9521V20I |
| 廠商： | INTERSIL CORP |
| 元件分類： | 數字電位計 |
| 英文描述： | Fiber Channel/Gigabit Ethernet Laser Diode Control for Fiber Optic Modules |
| 中文描述： | DUAL 100K DIGITAL POTENTIOMETER, 2-WIRE SERIAL CONTROL INTERFACE, 256 POSITIONS, PDSO20 |
| 封裝： | PLASTIC, TSSOP-20 |
| 文件頁數： | 5/26頁 |
| 文件大?。?/td> | 434K |
| 代理商： | X9521V20I |
REV 1.1.9 1/30/03
Characteristics subject to change without notice.
5 of 26
www.xicor.com
X9521
– Preliminary Information
Nonvolatile Write Acknowledge Polling
After a nonvolatile write command sequence (for either
the EEPROM array, the Non Volatile Memory of a DCP
(NVM), or the CONSTAT Register) has been correctly
issued (including the final STOP condition), the X9521 ini-
tiates an internal high voltage write cycle. This cycle typi-
cally requires 5 ms. During this time, no further Read or
Write commands can be issued to the device. Write
Acknowledge Polling is used to determine when this high
voltage write cycle has been completed.
To perform acknowledge polling, the master issues a
START condition followed by a Slave Address Byte. The
Slave Address issued must contain a valid Internal Device
Address. The LSB of the Slave Address (R/W) can be set
to either 1 or 0 in this case. If the device is still busy with
the high voltage cycle then no ACKNOWLEDGE will be
returned. If the device has completed the write operation,
an ACKNOWLEDGE will be returned and the host can
then proceed with a read or write operation. (Refer to Fig-
ure 5.).
DIGITALLY CONTROLLED POTENTIOMETERS
DCP Functionality
The X9521 includes two independent resistor arrays.
These arrays respectively contain 99 and 255 discrete
resistive segments that are connected in series. The
physical ends of each array are equivalent to the fixed
terminals of a mechanical potentiometer (R
inputs - where x = 1,2).
Hx
and R
Lx
At both ends of each array and between each resistor
segment there is a CMOS switch connected to the wiper
(R
w
x
may be turned on at any one time. These switches are
controlled by the Wiper Counter Register (WCR) (See
Figure 6). The WCR is a volatile register.
) output. Within each individual array, only one switch
On power up of the X9521, wiper position data is auto-
matically loaded into the WCR from its associated Non
Volatile Memory (NVM) Register. The Table below shows
the Initial Values of the DCP WCR’s before the contents of
the NVM is loaded into the WCR.
The data in the WCR is then decoded to select and
enable one of the respective FET switches. A “make
ACK
returned
Issue Slave Address
Byte (Read or Write)
Byte load completed
by issuing STOP.
Enter ACK Polling
Issue STOP
Issue START
NO
YES
High Voltage Cycle
complete. Continue
command sequence
Issue STOP
NO
Continue normal
Read or Write
command sequence
PROCEED
YES
Figure 5.
Acknowledge Polling Sequence
DECODER
RESISTOR
ARRAY
R
Hx
FET
SWITCHES
R
Lx
R
Wx
0
1
2
N
WIPER
COUNTER
REGISTER
(WCR)
NON
MEMORY
(NVM)
VOLATILE
“WIPER”
Figure 6.
DCP Internal Structure
DCP
Initial Values Before Recall
R
1
/ 100 TAP
R
2
/ 256 TAP
V
L
/ TAP = 0
V
H
/ TAP = 255
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相關代理商/技術參數 |
參數描述 |
|---|---|
| X9521V20I-A | 功能描述:IC DCP DUAL EEPROM MEM 20-TSSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 激光驅動器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:60 系列:- 類型:激光二極管驅動器 數據速率:- 通道數:4 電源電壓:3.3V 電流 - 電源:- 電流 - 調制:- 電流 - 偏置:- 工作溫度:0°C ~ 70°C 封裝/外殼:40-TQFN 裸露焊盤 供應商設備封裝:40-TQFN EP 包裝:托盤 安裝類型:表面貼裝 |
| X9521V20I-B | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Dual DCP, EEPROM Memory |
| X9521V20IZ-A | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Dual DCP, EEPROM Memory |
| X9521V20IZ-B | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Dual DCP, EEPROM Memory |
| X9522 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Laser Diode Control for Fiber Optic Modules |
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