Renesas ISL6271AEVAL1

Overview

ISL6271AEVAL1 from Intersil (now Renesas Electronics) is an evaluation board designed to validate the ISL6271A power management IC - a multi-output PMIC for Intel Bulverde XScale processors. It delivers three regulated outputs: 0.85–1.6V core voltage (VID/DVM controllable), 1.3V PLL voltage, and 1.1V SRAM voltage, all synchronized via a common enable signal. The board supports static VID configuration via on-board DIP switches and dynamic voltage management via USB-to-I2C interface.

For engineers reviewing the ISL6271AEVAL1 datasheet, ISL6271AEVAL1 pinout, ISL6271AEVAL1 application, or ISL6271AEVAL1 equivalent, this kit enables rapid functional validation of Vcore transient response, slew rate control, power sequencing, efficiency measurement setup, and I2C-based DVM implementation for XScale processor power systems.

Technical Context

The ISL6271AEVAL1 implements the full reference design for the ISL6271A controller, including a synchronous buck regulator for Vcore (PVCC input), two LDOs for VPLL and VSRAM (LVCC input), and integrated monitoring circuitry. It features dedicated test points (TP1–TP10), LED status indicators (LED1/LED2), and configurable jumpers (H1–H4) for power domain isolation and transient load injection.

Hardware interfaces include J1 (dual-input power header), J2 (I2C interface connector), J3 (electronic load output), and J4 (optional variable load access). Strapping options on S1 provide 4-bit VID selection, EN control, and I2C mode activation - enabling both static and dynamic voltage testing without external programming hardware.

Key Specifications

Availability

ISL6271AEVAL1 is available at Aetrix Electronics and suitable for XScale-based embedded computing, portable industrial controllers, and legacy mobile processor development requiring stable component supply, full-featured evaluation capability, and documented I2C-based DVM validation.

Supply support for ISL6271AEVAL1 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

Renesas Electronics Corporation is a global semiconductor manufacturer formed from the merger of NEC Electronics, Renesas Technology, and Elpida Memory. It specializes in microcontrollers, analog, power, and timing solutions for industrial, automotive, and infrastructure markets.

The ISL6271AEVAL1 belongs to Renesas' legacy power management evaluation platform family, developed specifically to accelerate adoption and validation of PMICs for Intel's XScale architecture - emphasizing low-noise regulation, precise VID sequencing, and dynamic voltage scaling in space-constrained portable systems.

FAQ

What is the primary function of the ISL6271AEVAL1 evaluation board?

The ISL6271AEVAL1 evaluation board is a fully assembled, tested hardware platform designed exclusively to evaluate the ISL6271A power management IC. It provides immediate access to all three regulated outputs (Vcore, VPLL, VSRAM), supports both static VID and dynamic I2C-based voltage control, and includes built-in test points, LEDs, and transient load generation - enabling comprehensive functional validation without custom PCB design. The ISL6271AEVAL1 is not a standalone power solution but a characterization and debug tool for the ISL6271A PMIC.

Does the ISL6271AEVAL1 support dynamic voltage management (DVM) for the ISL6271A?

Yes, the ISL6271AEVAL1 fully supports DVM functionality via its J2 connector and included USB-to-I2C interface module. When S1 position 6 is set to 'right', the board enters I2C mode, allowing PC-based software to write voltage setpoints (0.85–1.3V in 16 steps) and slew rates (0.1–5 mV/µs in 4 steps) directly to the ISL6271A. Real-time Vcore response can be observed using TP5 (AC-coupled) and triggered off the I2C clock signal accessible on the interconnect cable - confirming DVM operation as specified in the ISL6271A datasheet.

How do I configure the ISL6271AEVAL1 for static VID voltage selection?

To configure the ISL6271AEVAL1 for static VID, set all positions of DIP switch S1 to the 'left' (default), except for positions 1–4 which encode the 4-bit VID code. For example, sliding S1 positions 1–4 right sets Vcore to 0.85V; returning them left restores 1.6V. S1 position 5 controls global enable/disable, and position 6 must remain left for VID mode. Jumpers H1 (enabled), H2–H4 (open) isolate auxiliary circuits during static testing - ensuring accurate DC measurements at TP8/TP9 (Vcore), TP6/TP7 (VPLL), and TP10/TP9 (VSRAM).

What power supplies are required to operate the ISL6271AEVAL1?

The ISL6271AEVAL1 requires two independent DC power sources: 3.7V (±50mV) applied to the PVCC input (J1 pin +) and 2.5V (±50mV) applied to the LVCC input (J1 pin LVCC+). Both supplies must share a common ground (J1 pin –). Under no circumstances should either supply exceed 6.0V. The 3.7V rail powers the synchronous buck regulator (Vcore), while the 2.5V rail powers the two LDOs (VPLL and VSRAM). External loads must be connected via J3 or J4, not across test points.

Can the ISL6271AEVAL1 be used to measure efficiency of the ISL6271A core regulator?

Yes, the ISL6271AEVAL1 supports core regulator efficiency measurement when configured correctly: remove the shunt from H1 to disable LED and transient generator circuits, separate LVCC from PVCC by leaving H2 open, and eliminate all non-core loads. Input power is measured at J1 (PVCC and GND), output power at TP8/TP9 (Vcore) and J3 (load current). The board's layout isolates the buck stage, and TP2 provides access to the phase node for switching loss analysis - enabling accurate η = (Vcore × Iload) / (PVCC × Iin) calculation per the ISL6271A datasheet test conditions.