MCP3421DM-BFG Microchip Technology, MCP3421DM-BFG Datasheet - Page 9

• Manufacturer Part Number: MCP3421DM-BFG
• Description: BOARD DEMO FOR MCP3421
• Manufacturer: Microchip Technology

Specifications of MCP3421DM-BFG

• Main Purpose: Power Management, Battery Gauge
• Utilized Ic / Part: MCP3421
• Processor To Be Evaluated: MCP3421
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

1.1
© 2007 Microchip Technology Inc.
INTRODUCTION
The MCP3421 Battery Fuel Gauge Demo Board is used to demonstrate the MCP3421
device for battery fuel gauging applications.
The MCP3421 Battery Fuel Gauge Demo Board includes two MCP3421 devices,
MCP73831(single cell Li-Ion/Li-Polymer Charger), and PIC18F4550 MCU.
The MCP3421 device is a low-power, single channel 18-bit delta-sigma Analog-to-Dig-
ital Converter (ADC) in a SOT-23 package. It has an internal voltage reference
(V
with a master device with I
The MCP3421 Battery Fuel Gauge Demo Board measures: (a) the battery voltage and
(b) the current coming out from the battery in the discharging mode and into the battery
in the charging mode using the ADC device (if charging mode is enabled (optional)). It
calculates the total fuel used and also remaining fuels. The measurement takes places
approximately every one second and updates the measurement data and calculated
results on the LCD for about every second.
The MCP3421 Battery Fuel Gauge Demo Board includes 2x16 LCD. The LCD
displays: (a) measured battery voltage and current, (b) calculated results of battery fuel
used.
The MCP3421 Battery Fuel Gauge Demo Board also includes a buzzer. This buzzer
makes a buzzing sound when the battery voltage drops 50% or the battery is not
connected.
The PIC18F4550 communicates with the MCP3421 and calculates the fuels. The
board also includes a USB connector for a PC graphic user interface (GUI) utility. This
GUI is available only for the training class and not included with this demo kit.
Figure 1-1 shows the picture of the MCP3421 Battery Fuel Gauge Demo Board. The
board includes device foot prints for the two channel 18-bit ADC (MCP3422). The
MCP3421 and MCP3422 are the same device family with the same electrical
performance, but the MCP3422 has two channels. Therefore, the two MCP3421
devices on the board can be replaced with one MCP3422 device.
REF
Note:
Chapter 1. Product Overview
= 2.048V) and programmable gain amplifier (x1,x2, x4, x8). It communicates
MCP3421 Battery Fuel Gauge Demo Board has a feature to charge the
battery in use. This feature is currently disabled in firmware. Please contact
Microchip Technology Inc. if you need the battery charging feature.
MCP3421 BATTERY FUEL GAUGE
2
DEMO BOARD USER’S GUIDE
C interface.
DS51683A-page 5