参数资料
| 型号： | ISL22449UFV14Z |
| 厂商： | Intersil |
| 文件页数： | 13/13页 |
| 文件大小： | 0K |
| 描述： | IC POT DGTL 128TP LN LP 14-TSSOP |
| 标准包装： | 96 |
| 系列： | XDCP™ |
| 接片： | 128 |
| 电阻（欧姆）： | 50k |
| 电路数： | 4 |
| 温度系数： | 标准值 ±80 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： | 14-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 14-TSSOP |
| 包装： | 管件 |
9
FN6333.3
July 17, 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 ISL22449, 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 ISL22449 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 ISL22449 is an integrated circuit incorporating four 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 ISL22449 is being powered up, all four 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, 0001b, 0010b or 0011b to access the WR of DCP0,
DCP1, DCP2 or DCP3 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 ISL22449 contains seven non-volatile and five volatile 8-
bit registers. The memory map of ISL22449 is on Table 1. The
four non-volatile registers (IVRi) at address 0, 1, 2 and 3,
contain initial wiper value and volatile registers (WRi) contain
current wiper position. In addition, three non-volatile General
Purpose registers from address 4 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 WR or initial value registers IVR.
If VOL bit is 0, the non-volatile IVR 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. 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
General Purpose
Not Available
3
2
1
0
IVR3
IVR2
IVR1
IVR0
WR3
WR2
WR1
WR0
TABLE 2. ACCESS CONTROL REGISTER (ACR)
BIT #
7
6
5
432
1
0
Bit Name
VOL
SHDN
WIP
000
0
ISL22449
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| ISL22449UFV14Z-TK | 功能描述:IC POT DGTL 128TP LN LP 14-TSSOP 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) |
| ISL22449WFV14Z | 功能描述:IC POT DGTL 128TP LN LP 14-TSSOP 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) |
| ISL22449WFV14Z-TK | 功能描述:IC POT DGTL 128TP LN LP 14-TSSOP 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) |
| ISL22511 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Low Noise, Low Power, 32 Taps, Push Button Controlled Potentiometer Single Push Button Controlled Potentiometer XDCP |
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