- 您现在的位置：买卖IC网 > PDF目录383129 > ISL22349 (Intersil Corporation) Low Noise, Low Power, I2C Bus, 128 Taps, Wiper Only(低噪声,低功率，I2C总线, 128抽头电位器) PDF资料下载
参数资料
| 型号： | ISL22349 |
| 厂商： | Intersil Corporation |
| 英文描述： | Low Noise, Low Power, I2C Bus, 128 Taps, Wiper Only(低噪声,低功率，I2C总线, 128抽头电位器) |
| 中文描述： | 低噪声，低功耗，I2C总线，128抽头，雨刷，只有（低噪声，低功率和I2C总线，128抽头电位器） |
| 文件页数： | 9/12页 |
| 文件大小： | 332K |
| 代理商： | ISL22349 |
9
FN6331.2
September 15, 2006
Bus Interface Pins
Serial Data Input/Output (SDA)
The SDA is a bidirectional serial data input/output pin for I
2
C
interface. It receives device address, operation code, wiper
address and data from an I
2
C external master device at the
rising edge of the serial clock SCL, and it shifts out data after
each falling edge of the serial clock.
SDA requires an external pull-up resistor, since it is an open
drain input/output.
Serial Clock (SCL)
This is the serial clock input of the I
2
C serial interface. SCL
requires an external pull-up resistor, since it is an open drain
input.
Device Address (A2 - A0)
The address inputs are used to set the least significant 3 bits
of the 7-bit I
2
C interface slave address. A match in the slave
address serial data stream must match with the Address
input pins in order to initiate communication with the
ISL22349. A maximum of 8 ISL22349 devices may occupy
the I
2
C serial bus.
Principles of Operation
The ISL22349 is an integrated circuit incorporating four
DCPs with their associated registers, non-volatile memory
and an I
2
C serial interface providing direct communication
between a host and the potentiometers and memory. The
resistor arrays are 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 are recalled and
loaded into the corresponding WRi to set the wipers 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 V
CC
.
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 V
CC
.
While the ISL22349 is being powered up, all four WRs are
reset to 40h (64 decimal), which locates RW roughly at the
center between GND and V
CC
. 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 WRs can be read or written to directly using the I
2
C
serial interface as described in the following sections. The
I
2
C interface Address Byte has to be set to 00h, 01h, 02h or
03h to access the WR of DCP0, DCP1, DCP2 or DCP3
respectively.
Memory Description
The ISL22349 contains seven non-volatile and five volatile
8-bit registers. The memory map of ISL22349 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 at
access control register (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 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. This bit is logically OR’d with SHDN pin. When this bit
is 0, DCPs are in Shutdown mode. Default value of SHDN bit
is 1.
TABLE 1. MEMORY MAP
ADDRESS
NON-VOLATILE
VOLATILE
8
—
ACR
7
Reserved
6
5
4
General Purpose
General Purpose
General Purpose
Not Available
Not Available
Not Available
3
2
1
0
IVR3
IVR2
IVR1
IVR0
WR3
WR2
WR1
WR0
TABLE 2. ACCESS CONTROL REGISTER (ACR)
VOL
SHDN
WIP
0
0
0
0
0
ISL22349
相关PDF资料 |
PDF描述 |
|---|---|
| ISL23710UIU10Z | Terminal Voltage +-3V or +-5V, 128 Taps Up/Down Interface |
| ISL23710WIU10Z | Terminal Voltage +-3V or +-5V, 128 Taps Up/Down Interface |
| ISL23710 | Terminal Voltage +-3V or +-5V, 128 Taps Up/Down Interface |
| ISL23711UIU10Z | Terminal Voltage +-3V or +-5V, 128 Taps IC Serial Interface |
| ISL23711WIU10Z | Terminal Voltage +-3V or +-5V, 128 Taps IC Serial Interface |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL22349_09 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Quad Digitally Controlled Potentiometers |
| ISL22349UFV14Z | 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) |
| ISL22349UFV14Z-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) |
| ISL22349WFV14Z | 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) |
| ISL22349WFV14Z-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) |
发布紧急采购，3分钟左右您将得到回复。