admin 发表于 2010-4-17 17:47:20

MCP45/46XX DataSheet

http://www.microchip.com/stellent/images/mchpsiteimages/dwnfolder.gif7/8-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 NameValue
Temp. Range (°C)-40 to +125
Volatile / Non VolatileVolatile
Number of Taps128
Resistance (ohms) K5, 10, 50, 100
# per Package1
INL (Max)0.5
DNL (Max)0.25
InterfaceI²C™

   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)


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