STMicroelectronics STEVAL-ISB005V1

Overview

STEVAL-ISB005V1 from STMicroelectronics is a low-cost, standalone Li-Ion/Li-polymer battery charger demonstration board based on the L6924D linear charger IC and ST72F63BK6M1 8-bit microcontroller. It supports dual-power input (USB 5 V or external DC adapter), delivers up to 1 A charging current, uses LEDs for real-time charge-status indication, and includes an ICC programming interface for firmware updates.

For engineers reviewing the STEVAL-ISB005V1 datasheet, STEVAL-ISB005V1 pinout, STEVAL-ISB005V1 application, or STEVAL-ISB005V1 equivalent, this board serves as a validated reference design for USB-compliant portable battery charging systems requiring automatic mode switching, thermal regulation, and programmable end-of-charge control.

Technical Context

The board implements a two-stage charging architecture: constant-current (CC) followed by constant-voltage (CV), with the L6924D handling analog power regulation and thermal foldback, while the ST72F63BK6M1 manages USB enumeration, SD pin control, and status reporting via LEDs. Charging current is set to 1 A via external resistor (R2 = 10 kΩ) and end-of-charge threshold is fixed at 10% of I_CHG.

In USB mode, the L6924D draws power directly from VBUS (5 V ±5%), complies with USB 2.0 high-power device limits (500 mA max before enumeration, 1 A after), and disables charging if VBUS drops below 4.35 V. In adapter mode, the L6924D operates autonomously without MCU intervention, accepting 5–12 V input at the ADPT_V terminal.

Key Specifications

Availability

STEVAL-ISB005V1 is available at Aetrix Electronics and suitable for portable medical monitors, handheld test equipment, rechargeable IoT sensors, and USB-powered consumer electronics requiring stable component supply and pre-validated charging architecture.

Supply support for STEVAL-ISB005V1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, analog devices, and MEMS sensors for industrial, automotive, and consumer applications.

The STEVAL evaluation board series targets rapid prototyping and reference implementation of ST's analog and mixed-signal ICs - specifically enabling fast validation of battery management, USB power delivery, and embedded control subsystems.

FAQ

What power sources does STEVAL-ISB005V1 support?

STEVAL-ISB005V1 accepts two independent inputs: 5 V USB power (via standard USB-B connector) and 5–12 V DC adapter power (via barrel jack). The board automatically selects source priority - USB first when present, otherwise defaults to adapter. No manual switching is required.

How is charging current configured on this board?

Charging current is set to 1 A by default using R2 (10 kΩ) per the L6924D datasheet formula I_CHG = 1000 / R_SET (kΩ). R2 is populated as a 10 kΩ resistor; changing it alters output current linearly - e.g., 20 kΩ yields 500 mA.

Does the board support battery temperature monitoring?

No - the STEVAL-ISB005V1 schematic shows no NTC thermistor interface or ADC channel dedicated to battery temperature sensing. Thermal protection relies solely on the L6924D's internal junction sensor (125 °C foldback), not external battery thermistors.

Can the ST72F63BK6M1 firmware be reprogrammed in-circuit?

Yes - the board includes a 6-pin ICC header (J1) compatible with ST's ST-LINK or legacy ST-ICC programmers. Pin assignments match ST's standard ICC protocol: ICCCLK, ICCDATA, VDD, VSS, RESET, and VPP - enabling full flash read/write/debug capability.