STEVAL-ISB002V1 STMicroelectronics

STEVAL-ISB002V1 High efficiency step-down controller demonstration board with embedded 2 A LDO regulator based on the ST72F324L Data brief Features 1 % measurement accuracy Firmware easily upgradeable Li-ion battery or 2-cell NiMH batteries 5 V supply RoHS compliant Description The STEVAL-ISB002V1 is a universal battery charger (UBC) demonstration board based on the ST72F324L microcontroller. STEVAL-ISB002V1 The charger used in this demonstration board uses a modified form of a non-inverting buck- boost converter to support the charging voltage requirement for single-cell Li-ion batteries. The board includes a 3.3 V power supply generated from a KF33 regulator and a precision reference voltage generated from the TL1431, bearing in mind the accuracy requirement for charging. A status LED is used to show the charging status. This demonstration board is capable of charging single cell Li-ion batteries with in-built NTC or a 2- cell NiMH battery from a 5 V supply. The firmware is easily upgradeable and can be modified for other ST7 microcontrollers depending on application requirements. November 2010 Doc ID 18257 Rev 1 1/4 For further information contact your local STMicroelectronics sales office. www.st.com 4 Obsolete Product(s) - Obsolete Product(s) Circuit schematic STEVAL-ISB002V1 1 Circuit schematic Figure 1. Circuit schematic VDD 3PA 8R k1 VDD 52 0PE 7PC TFRON E 1PE 6PC 0PB 5PC 3PB 4PC 4PB 3PC O PD 2PC 1PD 1PC 2/4 Doc ID 18257 Rev 1 Obsolete Product(s) - Obsolete Product(s) R3 Vin VAREF 100 (1%) X1 Vsupply D3 F1 1 R16 2 FUSE2 IN4148 4.7k (0.1%) J2 V+ 1 U1 TL1431AIZ AIN8 2 VDD 1 8 D4 V- Li-ION BATTERY Vout Vin 3 R1 2 7 3 C2 GND GND 3 6 100nF (Not To BeMounted) 330 GND GND 4 5 NC INHIBIT Q3 R17 R15 3 4 KF33BDTR 15k (0.1%) B E 2 5 J3 10k C C 1 6 V+ C C 1 V- Ni-MH BATTERY 2 STT818B L1 D2 R2 75uH/1000mA AIN1 100 V+ Vsupply D1 BT1 1N5821 R22 R24 1N5821 C1 R19 Li-ION BATTERY 3.3k (0.5%) 13.32k(0.5%) Vin 470uF/16V 5k (0.5%) U3 R4 th AIN8 1 8 O1 VCC 100 2 7 1- O2 Q1 AIN0 V- 3 6 1+ 2- 4 5 GND 2+ R23 2 R20 Q5 LM258AD 0.5,1W(0.5%) R7 Q4 5k (0.5%) 3 1 Vin 1 2STF1360 1k R5 Q2 2STR1215 470 2 2STR1215 2STR2215 R26 470 R6 1k BT2 R13 Ni-MH BATTERY R27 68 470 R9 D5 LED1 LED 470 R10 D6 LED2 LED Q6 470 V- R11 D7 RT1 2 E FRONT LED3 LED AIN14 470 4.7k/NTC R12 D8 2STR1215 LED4 LED 470 OSC EXT C3 33pF Y1 16MHz OSC2 C4 ICC 33pF U2 CON1 J1 ICCDATA 1 2 ICCCLK GND 3 4 R21 VDD VAREF 1 24 OSC1 VDD RESET VAREF OSC1 5 6 GND 2 23 OSC2 R25 ICCSEL R14 10k(1%) VSS OSC2 4.7k VDD 7 8 AIN8 3 GND 22 OSC EXT 10k AIN8/PF0 VSS 9 10 C5 4 21 RESET PF1 RESET 5 20 ICCSEL 10nF HEADER 5X2 PWM-1 AIN10/PF4 ICCSEL 6 19 LED4 S1 PF6 PA7 7 ST72F324LK2T6 18 LED3 PF7 PA6 8 17 LED2 PC0 PA4 C6 VDD 2.2uF/16V STMicroelectronicsPvtLtd C7 Plot no. 1, Knowledge Park III, AIN0 Greater Noida-201308,UP 100nF PWM-2 INDIA C8 AIN1 100nF UNIVERSAL BATT CHARGER C9 VDD AIN8 R18 100nF 4.7k(1%) C10 AIN14 100nF 1 3 PWM-1 PWM-2 1 3 3 2 9 32 AIN1 10 31 AIN0 11 30 (HS)/ ICCDATA 12 29 AIN14 13 28 ICCCLK 14 27 15 26 LED1 16 2 1 t 2 1 3 1 OSC1 2 3