ISL23425

Dual, 256-Tap, Low Voltage Digitally Controlled Potentiometer (XDCP™)

Product Status: 量産中

OVERVIEW

The ISL23425 is a volatile, low voltage, low noise, low power, 256-tap, dual digitally controlled potentiometer (DCP) with an SPI Bus™ interface. It integrates two DCP cores, wiper switches and control logic on a monolithic CMOS integrated circuit.

Each digitally controlled potentiometer is implemented with a combination of resistor elements and CMOS switches. The position of the wipers are controlled by the user through the SPI bus interface. Each potentiometer has an associated volatile Wiper Register (WRi, i = 0, 1) that can be directly written to and read by the user. The contents of the WRi controls the position of the wiper. When powered on, the wiper of each DCP will always commence at mid-scale (128 tap position).

The low voltage, low power consumption, and small package of the ISL23425 make it an ideal choice for use in battery operated equipment. In addition, the ISL23425 has a VLOGIC pin allowing down to 1.2V bus operation, independent from the VCC value. This allows for low logic levels to be connected directly to the ISL23425 without passing through a voltage level shifter.

The DCP can be used as a three-terminal potentiometer or as a two-terminal variable resistor in a wide variety of applications including control, parameter adjustments, and signal processing.

KEY FEATURES

  • Two potentiometers per package
  • 256 resistor taps
  • 10kΩ, 50kΩ or 100kΩ total resistance
  • SPI serial interface
  • No additional level translator for low bus supply
  • Daisy Chaining of multiple DCPs
  • Maximum supply current without serial bus activity (standby)
  • 4µA @ VCC and VLOGIC = 5V
  • 1.7µA @ VCC and VLOGIC = 1.7V
  • Shutdown Mode
  • Forces the DCP into an end-to-end open circuit and RWi is connected to RLi internally
  • Reduces power consumption by disconnecting the DCP resistor from the circuit
  • Power supply
  • VCC = 1.7V to 5.5V analog power supply
  • VLOGIC = 1.2V to 5.5V SPI bus/logic power supply
  • Wiper resistance: 70Ω typical @ VCC = 3.3V
  • Power-on preset to mid-scale (128 tap position)
  • Extended industrial temperature range: -40°C to +125°C
  • 14 Ld TSSOP or 16 Ld µTQFN packages
  • Pb-free (RoHS compliant)

PARAMETRICS

Parameters
ISL23425
Basic Information
Production Status
量産中
チャネル当たりのデバイス数
2
タップ数
256
メモリタイプ
Volatile
バス/出力インタフェース
SPI
抵抗オプション (kΩ)
10, 100
電源電圧Vcc (V) (min)
1.7
電源電圧Vcc (V) (max)
5.5
電源電流Icc
4 µA
抵抗変化特性
Linear
VL端子電圧 (min)
0 V
VL端子電圧 (max)
5.5 V
ワイパ電流 (mA)
3
ワイパ抵抗 (Ω)
70
二電源範囲 (V)
N/A
最大動作温度
125 °C
エンドツーエンド温度係数 (ppm/øC)
45, 65, 125
中間点レシオメトリック温度係数
8, 4, 2.3
特長
VLOGIC 1.2V to 5.5V; Daisy Chainable to minimize # I/0 pins on microcontroller
認定レベル
Standard
単一電源範囲 (V)
0 to 5.5
電源電圧Vcc範囲 (V)
1.7 to 5.5
CANサンプル
YES
温度範囲
-40 to +125

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