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參數(shù)資料
| 型號(hào)： | X95820 |
| 元件分類： | 數(shù)字電位計(jì) |
| 英文描述： | Dual Digitally Controlled Potentiometers (XDCP)(雙數(shù)控電位器) |
| 中文描述： | 雙數(shù)控電位器（數(shù)字電位器）（雙數(shù)控電位器） |
| 文件頁(yè)數(shù)： | 8/13頁(yè) |
| 文件大小： | 849K |
| 代理商： | X95820 |
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X95820
8 of 13
REV 1.20 7/28/04
www.xicor.com
PRINCIPLES OF OPERATION
The X95820 in as integrated circuit incorporating two
DCPs with their associated registers, non-volatile
memory, and a 2-wire serial interface providing direct
communication between a host and the potentiometers
and memory.
DCP Description
Each DCP is implemented with a combination of resistor
elements and CMOS switches. The physical ends of
each DCP are equivalent to the fixed terminals of a
mechanical potentiometer (RH and RL pins). The RW pin
of each DCP is connected to intermediate nodes, and is
equivalent to the wiper terminal of a mechanical
potentiometer. The position of the wiper terminal within
the DCP is controlled by an 8-bit volatile Wiper Register
(WR). Each DCP has its own WR. When the WR of a
DCP contains all zeroes (WR<7:0>: 00h), its wiper
terminal (RW) is closest to its “Low” terminal (RL). When
the WR of a DCP contains all ones (WR<7:0>: FFh), its
wiper terminal (RW) is closest to its “High” terminal (RH).
As the value of the WR increases from all zeroes (00h) to
all ones (255 decimal), the wiper moves monotonically
from the position closest to RL to the closest to RH. At the
same time, the resistance between RW and RL increases
monotonically, while the resistance between RH and RW
decreases monotonically.
While the X95820 is being powered up, all two WRs are
reset to 80h (128 decimal), which locates RW roughly at
the center between RL and RH. Soon after the power
supply voltage becomes large enough for reliable non-
volatile memory reading, the X95820 reads the value
stored on two different non-volatile Initial Value Registers
(IVRs) and loads them into their corresponding WRs.
The WRs and IVRs can be read or written directly using
the 2-wire serial interface as described in the following
sections.
Memory Description
The X95820 contains eight non-volatile bytes. they are
accessed by 2-wire interface operations with Address
Bytes 0 through 7 decimal. The first two non-volatile bytes
at addresses 0 and 1 contain the initial value loaded at
power-up into the volatile Wiper Registers (WRs) of
DCP0 and DCP1 respectively. Bytes at addresses 2, 3, 4,
5, and 6 are available to the user as general purpose
registers. The byte at address 7 is reserved; the user
should not write to it, and its value should be ignored if
read.
The volatile WR, and the non-volatile Initial Value
Register (IVR) of a DCP are accessed with the same
Address Byte.
A volatile byte at address 8 decimal, controls what byte is
read or written when accessing DCP registers: the WR,
the IVR, or both.
When the byte at address 8 is all zeroes, which is the
default at power up:
– A read operation to addresses 0 or 1 outputs the
value of the non-volatile IVRs.
– A write operation to addresses 0 or 1 writes the
same value to the WR and IVR of the corresponding
DCP.
When the byte at address 8 is 80h (128 decimal):
– A read operation to addresses 0 or 1 outputs the
value of the volatile WR.
– A write operation to addresses 0 or 1only writes to
the corresponding volatile WR.
It is not possible to write to an IVR without writing the
same value to its corresponding WR.
00h and 80h are the only values that should be written to
address 8. All other values are reserved and must not be
written to address 8.
To access the general purpose bytes at addresses 2, 3,
4, 5, or 6, the value at address 8 must be all zeros.
The X95820 is pre-programed with 80h in the two IVRs.
Table 1. Memory Map
WR: Wiper Register, IVR: Initial value Register.
Address
8
7
6
5
4
3
2
1
0
Non-Volatile
—
Volatile
Access Control
Reserved
General Purpose
Not Available
IVR1
IVR0
WR1
WR0
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| X95820_06 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Dual Digital Controlled Potentiometers |
| X95820UV14I-2.7 | 功能描述:IC XDCP DUAL 256TAP 50K 14-TSSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:XDCP™ 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 接片:32 電阻（歐姆）:50k 電路數(shù):1 溫度系數(shù):標(biāo)準(zhǔn)值 50 ppm/°C 存儲(chǔ)器類型:易失 接口:3 線串行（芯片選擇，遞增，增/減） 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 細(xì)型，TSOT-23-6 供應(yīng)商設(shè)備封裝:TSOT-23-6 包裝:帶卷 (TR) |
| X95820UV14I-2.7T1 | 功能描述:IC XDCP DUAL 256TAP 50K 14-TSSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:XDCP™ 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 接片:32 電阻（歐姆）:50k 電路數(shù):1 溫度系數(shù):標(biāo)準(zhǔn)值 50 ppm/°C 存儲(chǔ)器類型:易失 接口:3 線串行（芯片選擇，遞增，增/減） 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 細(xì)型，TSOT-23-6 供應(yīng)商設(shè)備封裝:TSOT-23-6 包裝:帶卷 (TR) |
| X95820UV14IZ-2.7 | 功能描述:IC XDCP DUAL 256TAP 50K 14-TSSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:XDCP™ 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 接片:256 電阻（歐姆）:100k 電路數(shù):2 溫度系數(shù):標(biāo)準(zhǔn)值 35 ppm/°C 存儲(chǔ)器類型:易失 接口:6 線串行（芯片選擇，遞增，增/減） 電源電壓:2.6 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:帶卷 (TR) |
| X95820UV14IZ-2.7T1 | 功能描述:IC XDCP DUAL 256TAP 50K 14-TSSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:XDCP™ 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 接片:256 電阻（歐姆）:100k 電路數(shù):2 溫度系數(shù):標(biāo)準(zhǔn)值 35 ppm/°C 存儲(chǔ)器類型:易失 接口:6 線串行（芯片選擇，遞增，增/減） 電源電壓:2.6 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:帶卷 (TR) |
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