参数资料
| 型号： | ISL22444UFR20Z |
| 厂商： | Intersil |
| 文件页数： | 4/19页 |
| 文件大小： | 0K |
| 描述： | IC POT DGTL 256TP LN LP 20-QFN |
| 产品培训模块： | Solutions for Industrial Control Applications |
| 标准包装： | 600 |
| 系列： | XDCP™ |
| 接片： | 256 |
| 电阻（欧姆）： | 50k |
| 电路数： | 4 |
| 温度系数： | 标准值 ±45 ppm/°C |
| 存储器类型： | 非易失 |
| 接口： | 4 线 SPI（芯片选择） |
| 电源电压： | 2.25 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-VQFN 裸露焊盘 |
| 供应商设备封装： | 20-QFN 裸露焊盘（5x5） |
| 包装： | 管件 |
12
FN6426.0
May 24, 2007
contains all zeroes (WRi[7:0]= 00h), its wiper terminal (RWi)
is closest to its “Low” terminal (RLi). When the WRi register
of a DCP contains all ones (WRi[7:0]= FFh), its wiper
terminal (RWi) is closest to its “High” terminal (RHi). As the
value of the WRi increases from all zeroes (0) to all ones
(255 decimal), the wiper moves monotonically from the
position closest to RLi to the closest to RHi. At the same
time, the resistance between RWi and RLi increases
monotonically, while the resistance between RHi and RWi
decreases monotonically.
While the ISL22444 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 a
non-volatile Initial Value Register (IVRi). All the IVRs are
factory programmed with 80h.
The WRi and IVRi can be read or written to directly using the
SPI serial interface as described in the following sections.
Memory Description
The ISL22444 contains four non-volatile 8-bit Initial Value
Registers (IVRi), eleven non-volatile 8-bit General Purpose
(GP) registers, four volatile 8-bit Wiper Registers (WRi), and
volatile 8-bit Access Control Register (ACR). The memory
map of ISL22444 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 register at address 0Fh is a read-only reserved register.
Information read from this register should be ignored.
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 and General Purpose
registers are accessible. If VOL bit is 1, only the volatile WRi
are accessible. Note: value that 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, DCP is in Shutdown mode, i.e.
each DCP is forced to end-to-end open circuit and RWi is
shorted to RLi as shown on Figure 15. Default value of
SHDN bit is 1.
Setting SHDN bit to 1 is returned wipers to prior to Shutdown
Mode position.
The WIP bit (ACR[5]) is a read-only bit. It indicates that non-
volatile write operation is in progress. The WIP bit can be
read repeatedly after a non-volatile write to determine if the
write has been completed. It is impossible to write or read to
the WRi or ACR while WIP bit is 1.
The SDO bit (ACR[1]) configures type of SDO output pin.
The default value of SDO bit is 0 for Push - Pull output. SDO
pin can be configured as Open Drain output for some
application. In this case, an external pull up resistor is
required. See “Applications Information” on page 14.
SPI Serial Interface
The ISL22444 supports an SPI serial protocol, mode 0. The
device is accessed via the SDI input and SDO output with
data clocked in on the rising edge of SCK, and clocked out
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 #
76
5
4
3
2
1
0
BIT
NAME
VOL SHDN WIP
0
SDO
0
RLi
RWi
RHi
FIGURE 15. DCP CONNECTION IN SHUTDOWN MODE
ISL22444
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| ISL22444UFR20Z-TK | 功能描述:数字电位计 IC 277 TAP FL RNG IND QD SPI DCP 5X5 RoHS:否 制造商:Maxim Integrated 电阻:200 Ohms 温度系数:35 PPM / C 容差:25 % POT 数量:Dual 每 POT 分接头:256 弧刷存储器:Volatile 缓冲刷: 数字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作电源电压:1.7 V to 5.5 V 电源电流:27 uA 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:TQFN-16 封装:Reel |
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