AN205124 F²MC-8FX Family MB95200H/210H Series 8-Bit Microcontroller Battery Charger Reference Solution Associated Part Family: MB95200H/210H Series This application note describes the features of a Power Tool Battery Charger demo board. The battery charger solution is based on LPC MCU MB95F223K and MB39A132. Contents 1 2 Introduction ............................................................... 1 Demo Platform.......................................................... 2 2.1 Platform .................................................................. 2 3 Features ................................................................... 3 3.1 Battery Insertion Detection ..................................... 3 3.2 Support 2, 3 and 4 Cell Battery Pack ...................... 3 3.3 Support Setting Charger Voltage ............................ 3 3.4 Support Setting Charger Current ............................ 3 3.5 LED Display the Charger Status ............................. 4 1 4 Hardware .................................................................. 4 4.1 System Block Diagram ........................................... 4 4.2 Schematic............................................................... 5 4.3 MCU Pin Assignment ............................................. 6 5 Firmware .................................................................. 7 5.1 Flowchart ................................................................ 7 5.2 Firmware Project .................................................... 8 6 Additional Information ............................................... 9 Document History............................................................ 10 Introduction Power Tool Battery Charger Demo Board is used to charge the battery of handset. The battery charger solution is based on LPC MCU MB95F223K and MB39A132. MB95F223K is a SOP16 package MCU, which integrates composite timer, 8/10 A/D converter on chip. The MB39A132 is a DC/DC converter IC for charging Li-ion battery. This demo set supports features below: Battery insertion detection 2, 3 and 4 cell battery pack Setting charger voltage Setting charger current LED display the charger status. www.cypress.com Document No. 002-05124 Rev. *A 1 MB95200H/210H Series Battery Charger Reference Solution 2 Demo Platform Demo Platform of Battery Charger 2.1 Platform Figure 1 shows the demo platform of battery charger. The red and green LEDs show the charger status. Figure 1. Demo Platform www.cypress.com Document No. 002-05124 Rev.*A 2 MB95200H/210H Series Battery Charger Reference Solution 3 Features Features of Battery Charger 3.1 Battery Insertion Detection When battery insertion is detected, the charger checks the voltage and temperature of the inserted battery. The charger is stopped if it is abnormal. Charger stops the charge process and the red LED starts to flash when charger detects that battery type is unmatched. Charger continues the charge process when a new battery is inserted. 3.2 Support 2, 3 and 4 Cell Battery Pack Adjusting R11 and R12 can change the number of charger cell. When R11 is unconnected and R12 is 0 Ω, the charger supports 2 cells. When R11 is unconnected and R12 is unconnected, the charger supports 3 cells. When R11 is 0 Ω and R12 is unconnected, the charger supports 4 cells. The demo current status supports 3 cells. 3.3 Support Setting Charger Voltage Upon the setting of cell number, R9 and R10 can be adjusted to change the charge voltage. When NADJ3 >= 0.82, one cell charge voltage is 4.20 V. When 0.48<= NADJ3 <= 0.78, one cell charge voltage is 4.35 V. When 0 <= NADJ3 <= 0.18, one cell charge voltage is 4.00 V. When 0.22 <= NADJ3 <= 0.44, one cell charge voltage is 2×5×NADJ3 V. Now the demo R9 is 2 K and R10 is 12 K, one cell charge voltage is 4.2 V and the charger voltage is 12.6 V. 3.4 Support Setting Charger Current Upon above setting, R15 and R16 can be adjusted to change the upper limit of charge current. When NADJ2 >= 0.92, the upper limit of charge current is 2.85 A. When 0 <= NADJ2 <= 0.88, the upper limit of charge current is 2× (5×NADJ2-0.075) A. Now the demo R15 is 100 K and R16 is 24 K, the upper limit of charge current is 1.8 A. www.cypress.com Document No. 002-05124 Rev.*A 3 MB95200H/210H Series Battery Charger Reference Solution 3.5 LED Display the Charger Status The demo has two LEDs: green LED and red LED. The green LED keeps on showing that the charger enters standby mode when charging is started or the battery is fully charged. The green light flashes to show that the charger is charging. The red LED keeps on showing that the charger detects an over temperature in battery. The red LED flashes to show that the battery is unmatched. Charger stops the charge process when the red LED lights on or flash. Charger continues the charge process when a new battery is inserted or resumes to normal status. 4 Hardware Hardware of Battery Charger 4.1 System Block Diagram Figure 2 shows the demo system block diagram. The demo charger is developed based on MCU MB95F223K and MB39A132. MCU: AD module, switch control module and LED signal module DC input Charge manager LED Battery Figure 2. System Block Diagram www.cypress.com Document No. 002-05124 Rev.*A 4 MB95200H/210H Series Battery Charger Reference Solution 4.2 Schematic Figure 3 shows the schematic. Figure 3. Battery Charger www.cypress.com Document No. 002-05124 Rev.*A 5 MB95200H/210H Series Battery Charger Reference Solution 4.3 MCU Pin Assignment Table 1 shows the MB95F223K pin assignment in this system. Table 1. Pin Assignment Pin Number Pin Function 10 P01/INT01 AD input, VOUT 9 P02/INT02 AD input, CURRENT_DETECT 11 P03/INT03 AD input, BATTERY_DETECT 12 P04/INT04 AD input, TEMP_DETECT 13 P05/INT05 LED output, Green LED 14 P06/INT06 LED output, Red LED 15 P07/INT07 Switch output www.cypress.com Document No. 002-05124 Rev.*A 6 MB95200H/210H Series Battery Charger Reference Solution 5 Firmware Firmware of Battery Charger 5.1 Flowchart MCU initializes the on-chip peripherals and initializes the system parameters when the battery is detected and battery temperature is normal. When above status is normal, the system will entry charging process and continue to check the battery status and temperature. When the battery is fully charged, the charge process stops. The description of main loop function is shown in Figure 4. Figure 4. Main Loop Flowchart Start System initialization and green led on Check Battery status ready? N Y Check Temp status ready? N Y Enter charge and green led flash Y N Check Battery status ready? Y Check Temp status ready? N Y Check Battery fully? N Y Stop charge and green led on www.cypress.com Document No. 002-05124 Rev.*A 7 MB95200H/210H Series Battery Charger Reference Solution 5.2 Firmware Project This demo uses MB95F223K to implement all the functions. MB2146-08-E and SOFTUNE V3 are used to debug the demo. The table below explains the functions of the main files. Table 2. Battery Charger Function Files Function ad.c Detect battery type, temperature, current and voltage Global.c Define global variable Handle.c Function module Main.c Main function Ma95200.asm Cypress MCU head file Startup.asm MCU configure file Timer0.c System clock function Vecter.c Interrupt setting file The project is shown in Figure 5. Figure 5. Demo Project www.cypress.com Document No. 002-05124 Rev.*A 8 MB95200H/210H Series Battery Charger Reference Solution 6 Additional Information For more information on Cypress products, visit the following website: http://www.cypress.com/cypress-microcontrollers www.cypress.com Document No. 002-05124 Rev.*A 9 MB95200H/210H Series Battery Charger Reference Solution Document History Document Title: AN205124 – F²MC-8FX Family MB95200H/210H Series 8-Bit Microcontroller Battery Charger Reference Solution Document Number: 002-05124 Revision ECN Orig. of Change Submission Date ** - HUAL 09/27/2010 Initial release *A 5276162 HUAL 05/18/2016 Migrated Spansion Application Note MCU-AN-500100-E-10 to Cypress format. www.cypress.com Description of Change Document No. 002-05124 Rev.*A 10 MB95200H/210H Series Battery Charger Reference Solution Worldwide Sales and Design Support Cypress maintains a worldwide network of offices, solution centers, manufacturer’s representatives, and distributors. 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