参数资料
| 型号： | ISL22429WFU10Z |
| 厂商： | Intersil |
| 文件页数： | 13/13页 |
| 文件大小： | 0K |
| 描述： | IC POT DGTL 128TP LN LP 10-MSOP |
| 标准包装： | 50 |
| 系列： | XDCP™ |
| 接片： | 128 |
| 电阻（欧姆）： | 10k |
| 电路数： | 2 |
| 温度系数： | 标准值 ±50 ppm/°C |
| 存储器类型： | 非易失 |
| 接口： | 4 线 SPI（芯片选择） |
| 电源电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 管件 |
9
FN6332.2
May 28, 2009
SERIAL DATA INPUT (SDI)
The SDI is the serial data input pin for the SPI interface. It
receives device address, operation code, wiper address and
data from the SPI external host device. The data bits are
shifted in at the rising edge of the serial clock SCK, while the
CS input is low.
CHIP SELECT (CS)
CS LOW enables the ISL22429, placing it in the active
power mode. A HIGH to LOW transition on CS is required
prior to the start of any operation after power up. When CS is
HIGH, the ISL22429 is deselected and the SDO pin is at
high impedance, and (unless an internal write cycle is
underway) the device will be in the standby state.
Principles of Operation
The ISL22429 is an integrated circuit incorporating two
DCPs with its associated registers, non-volatile memory and
the SPI serial interface providing direct communication
between host and potentiometers and memory. The resistor
array is comprised of individual resistors connected in
series. At either end of the array and between each resistor
is an electronic switch that transfers the potential at that
point to the wiper.
The electronic switches on the device operate in a “make
before break” mode when the wiper changes tap positions.
When the device is powered down, the last value stored in
IVRi will be maintained in the non-volatile memory. When
power is restored, the contents of the IVRi is recalled and
loaded into the corresponding WRi to set the wiper to the
initial value.
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 and internally connected to Vcc and GND.
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 volatile Wiper Register (WR).
Each DCP has its own WR. When the WR of a DCP contains
all zeroes (WR[6:0] = 00h), its wiper terminal (RW) is closest
to GND. When the WR register of a DCP contains all ones
(WR[6:0] = 7Fh), its wiper terminal (RW) is closest to VCC.
As the value of the WR increases from all zeroes (0) to all
ones (127 decimal), the wiper moves monotonically from the
position closest to GND to the closest to VCC.
While the ISL22429 is being powered up, all two WRs are
reset to 40h (64 decimal), which locates RW roughly at the
center between GND and Vcc. After the power supply
voltage becomes large enough for reliable non-volatile
memory reading, all WRs will be reload with the value stored
in corresponding non-volatile Initial Value Registers (IVRs).
The SPI interface register address bits have to be set to
0000b or 0001b to access the WR of DCP0 or DCP1
respectively. 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 ISL22429 contains seven non-volatile and three volatile
8-bit registers. The memory map of ISL22429 is on Table 1.
The two non-volatile registers (IVRi) at address 0 and 1,
contain initial wiper value and volatile registers (WRi) contain
current wiper position. In addition, five non-volatile General
Purpose registers from address 2 to address 6 are available.
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 is to
wiper registers WRi or initial value registers IVRi.
If VOL bit is 0, the non-volatile IVRi register is accessible. If
VOL bit is 1, only the volatile WRi is accessible. Note, value
is written to IVRi register also is written to the WRi. The
default value of this bit is 0.
The SHDN bit (ACR[6]) disables or enables Shutdown
mode. This bit is logically AND with SHDN pin. When this bit
is 0, DCPs are in Shutdown mode. The default value of
SHDN bit is 1.
The WIP bit (ACR[5]) is 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 to the
IVRi, WRi or ACR while WIP bit is 1.
Shutdown Mode
The device can be put in Shutdown mode either by pulling the
SHDN pin to GND or setting the SHDN bit in the ACR register
to 0. The truth table for Shutdown mode is in Table 3.
TABLE 1. MEMORY MAP
ADDRESS
NON-VOLATILE
VOLATILE
8—
ACR
7
Reserved
6
5
4
3
2
General Purpose
Not Available
1
0
IVR1
IVR0
WR1
WR0
TABLE 2. ACCESS CONTROL REGISTER (ACR)
BIT #
7
6
5
432
1
0
Bit Name
VOL
SHDN
WIP
000
0
ISL22429
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL22429WFU10Z-TK | 功能描述:IC POT DGTL 128TP LN LP 10-MSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数字电位器 系列:XDCP™ 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 接片:32 电阻（欧姆）:50k 电路数:1 温度系数:标准值 50 ppm/°C 存储器类型:易失 接口:3 线串行（芯片选择，递增，增/减） 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 细型，TSOT-23-6 供应商设备封装:TSOT-23-6 包装:带卷 (TR) |
| ISL22444 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Quad Digitally Controlled Potentiometer XDCP |
| ISL22444TFR20Z | 功能描述:数字电位计 IC 273 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 |
| ISL22444TFR20Z-TK | 功能描述:数字电位计 IC 276 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 |
| ISL22444TFV20Z | 功能描述:数字电位计 IC 267 TAP FL RNG IND QD SPI DCP 20LD 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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