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參數(shù)資料
| 型號(hào)： | ISL22343TFR20Z |
| 廠商： | Intersil |
| 文件頁(yè)數(shù)： | 5/18頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC POT DGTL 256TP LN LP 20-QFN |
| 標(biāo)準(zhǔn)包裝： | 600 |
| 系列： | XDCP™ |
| 接片： | 256 |
| 電阻（歐姆）： | 100k |
| 電路數(shù)： | 4 |
| 溫度系數(shù)： | 標(biāo)準(zhǔn)值 ±45 ppm/°C |
| 存儲(chǔ)器類(lèi)型： | 非易失 |
| 接口： | I²C（設(shè)備位址） |
| 電源電壓： | 2.25 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 20-VQFN 裸露焊盤(pán) |
| 供應(yīng)商設(shè)備封裝： | 20-QFN 裸露焊盤(pán)（5x5） |
| 包裝： | 管件 |
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13
FN6423.1
March 13, 2008
same time, the resistance between RWi and RLi increases
monotonically, while the resistance between RHi and RWi
decreases monotonically.
While the ISL22343 is being powered up, the WRi is reset to
80h (128 decimal), which locates RWi roughly at the center
between RLi and RHi. After the power supply voltage
becomes large enough for reliable non-volatile memory
reading, the WRi will be reloaded with the value stored in
corresponding non-volatile Initial Value Register (IVRi).
The WRi and IVRi can be read or written to directly using the
I2C serial interface as described in the following sections.
Memory Description
The ISL22343 contains four non-volatile 8-bit Initial Value
Register (IVRi), eleven General Purpose non-volatile 8-bit
registers and five volatile 8-bit registers: four Wiper Registers
(WRi) and Access Control Register (ACR). Memory map of
ISL22343 is in Table 1. The non-volatile registers (IVRi) at
address 0, 1, 2 and 3 contain initial wiper position and volatile
registers (WRi) contain current wiper position.
The non-volatile IVRi and volatile WRi registers are
accessible with the same address.
The Access Control Register (ACR) contains information
and control bits described below in Table 2.
The VOL bit (ACR[7]) determines whether the access to
wiper registers WRi or initial value registers IVRi.
If VOL bit is 0, the non-volatile IVRi registers are accessible.
If VOL bit is 1, only the volatile WRi are accessible.
Note: value is written to IVRi register also is written to the
corresponding WRi. The default value of this bit is 0.
The SHDN bit (ACR[6]) disables or enables Shutdown mode.
When this bit is 0, DCPs are in Shutdown mode. Default value
of the SHDN bit is 1.
The WIP bit (ACR[5]) is a read-only bit. It indicates that non-
volatile write operation is in progress. It is impossible to write
to the WRi or ACR while WIP bit is 1.
I2C Serial Interface
The ISL22343 supports an I2C bidirectional bus oriented
protocol. The protocol defines any device that sends data onto
the bus as a transmitter and the receiving device as the
receiver. The device controlling the transfer is a master and
the device being controlled is the slave. The master always
initiates data transfers and provides the clock for both transmit
and receive operations. Therefore, the ISL22343 operates as
a slave device in all applications.
All communication over the I2C interface is conducted by
sending the MSB of each byte of data first.
Protocol Conventions
Data states on the SDA line must change only during SCL
LOW periods. SDA state changes during SCL HIGH are
reserved for indicating START and STOP conditions
(see Figure 16). On power-up of the ISL22343, the SDA pin
is in the input mode.
All I2C interface operations must begin with a START
condition, which is a HIGH to LOW transition of SDA while
SCL is HIGH. The ISL22343 continuously monitors the SDA
and SCL lines for the START condition and does not
respond to any command until this condition is met (See
Figure 16). A START condition is ignored during the power-
up of the device.
All I2C interface operations must be terminated by a STOP
condition, which is a LOW to HIGH transition of SDA while
TABLE 1. MEMORY MAP
ADDRESS
(hex)
NON-VOLATILE
VOLATILE
10
N/A
ACR
F
Reserved
E
General Purpose
N/A
D
General Purpose
N/A
C
General Purpose
N/A
B
General Purpose
N/A
A
General Purpose
N/A
9
General Purpose
N/A
8
General Purpose
N/A
7
General Purpose
N/A
6
General Purpose
N/A
5
General Purpose
N/A
4
General Purpose
N/A
3IVR3
WR3
2IVR2
WR2
1IVR1
WR1
0IVR0
WR0
TABLE 2. ACCESS CONTROL REGISTER (ACR)
BIT #
7
6
5
4
3
210
NAME
VOL
SHDN
WIP
0
000
RLi
RWi
RHi
FIGURE 15. DCP CONNECTION IN SHUTDOWN MODE
ISL22343
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| ISL22343TFR20Z-TK | 功能描述:數(shù)字電位計(jì) IC 264 TAP FL RNG IND QD I2C DCP 5X5 RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲(chǔ)器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
| ISL22343TFV20Z | 功能描述:數(shù)字電位計(jì) IC 256 TAP FL RNG IND QD I2C DCP 20LD RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲(chǔ)器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
| ISL22343TFV20Z-TK | 功能描述:數(shù)字電位計(jì) IC 258 TAP FL RNG IND QD I2C DCP 20LD RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲(chǔ)器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
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