MCP3221_06 Datasheet, PDF (1/28 Pages) Microchip Technology – Low Power 12-Bit A/D Converter With I2C™ Interface

MCP3221
Low Power 12-Bit A/D Converter With I²C™ Interface
Features
• 12-bit resolution
• ±1 LSB DNL, ±2 LSB INL max.
• 250 µA max conversion current
• 5 nA typical standby current, 1 µA max.
• I²C™-compatible serial interface
- 100 kHz I²C Standard Mode
- 400 kHz I²C Fast Mode
• Up to 8 devices on a single 2-Wire bus
• 22.3 ksps in I²C Fast Mode
• Single-ended analog input channel
• On-chip sample and hold
• On-chip conversion clock
• Single-supply specified operation: 2.7V to 5.5V
• Temperature range:
- Industrial: -40°C to +85°C
- Extended: -40°C to +125°C
• Small SOT-23-5 package
Applications
• Data Logging
• Multi-zone Monitoring
• Hand-Held Portable Applications
• Battery-Powered Test Equipment
• Remote or Isolated Data Acquisition
Package Type
5-Pin SOT-23
V_DD 1
V_SS 2
5 ^SCL
A_IN 3
4 SDA
Description
The Microchip Technology Inc. MCP3221 is a
successive approximation A/D converter with 12-bit
resolution. Available in the SOT-23-5 package, this
device provides one single-ended input with very low
power consumption. Based on an advanced CMOS
technology, the MCP3221 provides a low maximum
conversion current and standby current of 250 µA and
1 µA, respectively. Low current consumption,
combined with the small SOT-23 package, make this
device ideal for battery-powered and remote data
acquisition applications.
Communication to the MCP3221 is performed using a
2-wire, I²C compatible interface. Standard (100 kHz)
and Fast (400 kHz) I²C modes are available with the
device. An on-chip conversion clock enables
independent timing for the I²C and conversion clocks.
The device is also addressable, allowing up to eight
devices on a single 2-wire bus.
The MCP3221 runs on a single supply voltage that
operates over a broad range of 2.7V to 5.5V. This
device also provides excellent linearity of ±1 LSB
differential non-linearity and ±2 LSB integral non-lin-
earity, maximum.
Functional Block Diagram
V_DD V_SS
DAC
Sample
A_IN
and
Hold
Comparator
–
12-bit SAR
+
Clock
Control Logic
I²C™ Interface
SCL SDA
© 2006 Microchip Technology Inc.
DS21732C-page 1