CHARGER 11 CLICK
PID: MIKROE-3650
Weight: 21 g
Charger 11 Click is a LiFePO4 (lithium iron phosphate) battery charger. This click can be used for
Low-Cost LiFePO4 battery chargers, or Power Tools, toys, backup energy storage solutions, etc.
Charger 11 is based on MCP73123T controller which has some extra features enabling charging
without too much hassle. This click board has charging current control which uses SPI interface
through MCP4161 IC, which is an 8-bit digital potentiometer. For battery voltage monitoring this click
board uses MCP3221A5T analog to digital converter through I2C interface. On the board, there is a
Power LED and two extra LED’s which can be used for charging indications.
Charger 11 click is supported by a mikroSDK compliant library, which includes functions that simplify
software development. This Click board™ comes as a fully tested product, ready to be used on a
system equipped with the mikroBUS™ socket.
As a Lithium Iron Phosphate battery requires a very accurate current and voltage for
charging, Charger 11 click can be a perfect solution for such a task. Charger 11 click is
equipped with a highly integrated LiFePO4 battery charger. This click has a charging
current control IC over SPI interface which ensures perfect and efficient charging. With
Analog-To-Digital Converter through its 12-bit resolution and I2C interface, Charger 11
click has precise battery voltage monitoring. Charger 11 click meets all requirements for
charging this higher specific capacity, but low-density batteries.
HOW DOES IT WORK?
Charger 11 click is based on the MCP73123 - a highly integrated Lithium Iron Phosphate
(LiFePO4) battery charge management controller for use in space-limited and costsensitive applications, from Microchip. MCP73123 is an efficient Lithium Iron Phosphate
battery charger, thanks to specific charge algorithms for LiFePO4 batteries to achieve
optimal capacity and safety in shortest charging time possible. Along with its small
physical size, the low number of external components makes this IC ideally suitable for
various applications. MCP73123 is designed to employ a constant current and constant
voltage charge algorithm. The 3.6V factory preset reference voltage simplifies design.
The fast charge constant current is set by a digital potentiometer, on this Click it
is MCP4161 with external 1K resistor in series. The MCP73123 also limits the charge
current based on the temperature during high power or high ambient conditions. This
thermal regulation optimizes the charge cycle time while maintaining device reliability.
PROG pin of the MCP73123 also serves as the enable pin, where on this Click it is
wired in rheostat configuration with the digital potentiometer. That way the charging
current can be controlled.
The digital potentiometer on Charger 11 click is MCP4161 which offers a wide range of
product offerings using a SPI interface. WiperLock technology allows applicationspecific calibration settings to be secured in EEPROM. This digital pot is tied with
charger IC over its P0A control pin. By assigning values on MCP4161 from 0 to 10
kiloohms battery charging can be controlled. As there is a 1 K resistor in series it can
never be 0 ohms on MCP73123 chargers PROG pin. However, maximum resistance
cannot exceed 11 kiloohms. Fast charging can be regulated with 10K on PROG pin to
get 130 mA. To get 1000 mA digital potentiometer needs to go down to 0,1 K, along
with external resistor, which makes 1,1 K. Communication with digital potentiometer on
this Click and that way controlling the charger is done through SPI interface.
Another feature of Charger 11 click is a battery voltage monitoring which is done by
using a MCP3221A5T Analog-To-Digital converter. It is a 12-bit resolution SOT12
package device which provides one single ended input and is based on advanced
CMOS technology. Communication to the MCP3221A5T is done by I2C interface where
standard and fast modes are available for this device.
Charger 11 click for voltage reference use a MCP1541, which has a high precision
output voltage of 4.096 volts, and which is then compared to battery voltage in order to
get precise measurements. This voltage reference circuit uses a combination of an
advanced CMOS design and EPROM timing to provide initial tolerance of ±1% max.
On the right side of the click board is an input screw terminal with corresponding
markings, where the recommended external voltage of 6V can be applied. The left
screw terminal is reserved for a Lithium Iron Phosphate battery with GND and VBAT+
markings. When connected to power source, the green PWR LED will indicate it. Red
LED1 and green LED2 can be used for visual charge monitoring. As those two LEDs
are multipurpose, they can be used for various things.
SPECIFICATIONS
Type
Battery charger
Applications
Charger 11 is a perfect choice for development LiFePO4 battery
charging applications. It offers two screw terminal connections,
LED indicators for fast and easy prototyping.
On-board
modules
MCP73123, a highly integrated Lithium Iron Phosphate LiFePO4
battery charge management controller.
Key Features
Designed for safe and efficient charging one LiFePO4 battery,
battery voltage monitoring, two screw terminals, two multipurpose
indicators over LEDs and mikroBUS™ pins, etc.
Interface
I2C,SPI,GPIO
Click board
size
M (42.9 x 25.4 mm)
Input Voltage
3.3V,5V
PINOUT DIAGRAM
This table shows how the pinout on Charger 11 click corresponds to the pinout of the
mikroBUS™ socket (the latter shown in the two middle columns).
Notes
Pin
Pin
Notes
Red LED Indicator
LR
1
AN
PWM
16
LG
Green LED Indicator
NC
2
RST
INT
15
ST
Status Out
Chip Select
CS
3
CS
RX
14
NC
Serial Clock
SCK
4
SCK
TX
13
NC
Serial data out
SDO
5
MISO
SCL
12
SCL
I2C Clock
Serial data in
SDI
6
MOSI
SDA
11
SDA
I2C Data
Power Supply
3.3V
7
3.3V
5V
10
5V
Ground
GND
8
GND
GND
9
GND
Power Supply
Ground
SOFTWARE SUPPORT
We provide a library for the Charger 11 click on our LibStock page, as well as a demo
application (example), developed using MikroElektronika compilers. The demo can run
on all the main MikroElektronika development boards.
Library Description
Library contains function for getting INT pin state Library contains functions for setting
AN, PWM and CS pin states Library contains function for spi transfer Library contains
functions for getting and setting registers via SPI Library contains functions for wiper
increment and decrement Library contains function for getting wiper position Library
contains function for getting raw adc data Library contains function for getting output
voltage
Key functions:
void charger11_spi_increment_wiper( void ) - increments wiper position by sending 8bit
increment wiper command
void charger11_spi_decrement_wiper( void ) - decrements wiper position by sending 8bit
decrement wiper command
float charger11_i2c_get_volt( float reference_voltage ) - gets raw ADC data and converts it to
voltage based on reference voltage setting
Examples description
The application is composed of three sections :
System Initialization - Initalizes INT, PWM, CS, AN pins and SPI, I2C, LOG modules
Application Initialization - Initializes SPI and I2C drivers
Application Task - Waits for user input in order to increment, decrement wiper or log report (Wiper
position and Output voltage)
void applicationTask( )
{
uart_ready = UART_Data_Ready( );
if (uart_ready == 1)
{
uart_char = UART_Read( );
switch (uart_char)
{
case '+' :
{
charger11_case_Plus( );
break;
}
case '‐' :
{
charger11_case_Minus( );
break;
}
case 'r' :
{
charger11_case_Report( );
break;
}
default :
{
mikrobus_logWrite( "> Invalid command", _LOG_LINE );
break;
}
}
}
}
Additional Functions :
charger11_FloatCut( ) - Rounds float value to two decimals
charger11_log_wiper_position( ) - Logs current Wiper position
charger11_case_Plus( ) - Increments Wiper position
charger11_case_Minus( ) - Decrements Wiper position
charger11_case_Report( ) - Logs current Wiper position and Output voltage
The full application code, and ready to use projects can be found on our LibStock page.
Other mikroE Libraries used in the example:
I2C
SPI
UART
Conversions
Additional notes and informations
Depending on the development board you are using, you may need USB UART
click, USB UART 2 click or RS232 click to connect to your PC, for development systems
with no UART to USB interface available on the board. The terminal available in all
MikroElektronika compilers, or any other terminal application of your choice, can be
used to read the message.
MIKROSDK
This Click board™ is supported with mikroSDK - MikroElektronika Software
Development Kit. To ensure proper operation of mikroSDK compliant Click board™
demo applications, mikroSDK should be downloaded from the LibStock and installed for
the compiler you are using.
For more information about mikroSDK, visit the official page.
https://www.mikroe.com/charger‐11‐click/9‐10‐19
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