标题: MCP45/46XX DataSheet [打印本页] 作者: admin 时间: 2010-4-17 17:47 标题: MCP45/46XX DataSheet 7/8-Bit Single/Dual I2C Digital POT with Volatile Memory
The MCP45XX devices offer a wide range of product offerings using an I2C™Compatible interface. This family of devices support a 7-bit resistor network, Non-Volatile memory configurations, and Potentiometer and Rheostat pinouts. WiperLock Technology allows application-specific calibration settings to be secured in the EEPROM.
Parameter Name Value
Temp. Range (°C) -40 to +125
Volatile / Non Volatile Volatile
Number of Taps 128
Resistance (ohms) K 5, 10, 50, 100
# per Package 1
INL (Max) 0.5
DNL (Max) 0.25
Interface I²C™
Features
Single or Dual Resistor Network options
Potentiometer or Rheostat configuration options
Resistor Network Resolution
- 7-bit: 128 Resistors (129 Steps)
RAB Resistances options of:
- 5kΩ
- 10kΩ
- 50kΩ
- 100 kΩ
Zero-Scale to Full-Scale Wiper operation
Low Wiper Resistance: 75Ω (typ.)
Low Tempco:
- Absolute (Rheostat): 50 ppm typical(0°C to 70°C)
- Ratiometric (Potentiometer): 15 ppm typical
Non-volatile Memory
- Automatic Recall of Saved Wiper Setting
- WiperLock™ Technology
- 10 General Purpose Memory Locations
I2C™Compatible Serial interface
- (100 kHz, 400 kHz and 3.4 MHz support)
- Internal weak pull-up on SDA and SCL pins
Serial protocol allows:
- High-Speed Read/Write to wiper
- Read/Write to EEPROM
- Write Protect to be enabled/disabled
- WiperLock to be enabled/disabled
Resistor Network Terminal Disconnect Feature via the Terminal Control (TCON) Register
Write Protect Feature:
- Hardware Write Protect (WP) Control pin
- Software Write Protect (WP) Configuration bit
Brown-out reset protection (1.5V typical)
Serial Interface Inactive current (2.5 uA typ.)
High-Voltage Tolerant Digital Inputs: Up to 12.5V
Internal weak pull-up on all digital inputs
Wide Operating Voltage:
- 2.7V to 5.5V - Device Characteristics Specified
- 1.8V to 5.5V - Device Operation
Wide Bandwidth (-3dB) Operation:
- 2 MHz (typ.) for 5.0 kΩ device
Extended temperature range (-40°C to +125°C)
