Microchip Technology DVA18XP280

Overview

DVA18XP280 from Microchip Technology Inc. is a device adapter for the MPLAB ICE 2000 in-circuit emulator system, designed to interface with 28-pin DIP-packaged PICmicro MCUs. It supports oscillator configuration via mechanical switches (S1/S2), provides target board clock routing, and enables emulation of devices requiring HS or IN oscillator modes. It is used during firmware development and debug of legacy PIC16/17-series microcontrollers.

For engineers reviewing the DVA18XP280 datasheet, DVA18XP280 pinout, DVA18XP280 application, or DVA18XP280 equivalent, this adapter's switch-controlled OSC1/OSC2 routing, DIP footprint compatibility, and integration with PCM16XE0/E1/PCM16XK0/L0 processor modules are critical selection criteria when emulating 28-pin PIC devices in development labs.

Technical Context

The DVA18XP280 implements dual-mode oscillator signal routing using two SPDT mechanical switches (S1 and S2) to select between internal emulator clock (OSC1INT/OSC2INT) and external target board clock (OSC1EXT/OSC2EXT). It interfaces directly with the emulator flex cable and targets 28-pin DIP footprints measuring 0.300" width.

No active circuitry is present - it is a passive interconnect assembly with plated-through-hole (PTH) contacts, oscillator buffering components, and mechanical switching logic. It draws ≤10 mA from the target system even when emulator power is active, due to on-board oscillator device biasing.

Key Specifications

Availability

DVA18XP280 is available at Aetrix Electronics and suitable for embedded firmware development, PIC microcontroller debugging, and legacy MCU validation requiring stable component supply across engineering lab deployments.

Supply support for DVA18XP280 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

Microchip Technology Inc. is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and development tools for embedded control applications.

The DVA18XP280 belongs to Microchip's MPLAB ICE 2000 device adapter product line, engineered specifically to enable low-risk, hardware-assisted debugging of 28-pin DIP-packaged PICmicro MCUs during firmware bring-up and validation.

FAQ

What is the primary function of the DVA18XP280 in the MPLAB ICE 2000 system?

The DVA18XP280 is a passive device adapter that physically and electrically connects the MPLAB ICE 2000 emulator pod to 28-pin DIP-packaged PICmicro MCUs. Its core function is to route oscillator signals (OSC1/OSC2) between the emulator's internal clock source and the target board's external clock, using mechanical switches S1 and S2. It does not contain active logic or programmable elements - DVA18XP280 serves solely as a configurable interface bridge for in-circuit emulation.

Which PICmicro MCU families are supported by the DVA18XP280?

The DVA18XP280 supports 28-pin DIP-packaged PICmicro MCUs compatible with PCM16XE0, PCM16XE1, PCM16XK0, and PCM16XL0 processor modules - including PIC16C716 and PIC16F716. It is not intended for use with PIC12, PIC14, or non-DIP packages. Confirmation of device support must be cross-referenced with Microchip's "Readme for MPLAB ICE 2000.txt" or DS00148 Product Selector Guide - DVA18XP280 does not support QFP, SOIC, or PLCC variants without transition sockets.

How do the S1 and S2 switches on the DVA18XP280 affect oscillator operation?

Switches S1 and S2 on the DVA18XP280 configure whether the emulator uses the internal oscillator (IN mode: S1→OSC2INT, S2→OSC1INT) or the target board's external crystal/resonator (HS mode: S1→OSC2EXT, S2→OSC1EXT). This selection determines clock source origin and affects timing fidelity during emulation. Incorrect switch positioning may prevent oscillator startup or cause inconsistent debug behavior - DVA18XP280 requires correct physical switch state before initiating MPLAB IDE session.

Does the DVA18XP280 require external power or generate heat during operation?

No - the DVA18XP280 is a passive adapter with no onboard power regulation, voltage conversion, or active components. It draws ≤10 mA from the target board solely to bias its oscillator circuitry and introduces negligible thermal load. Power is supplied either by the emulator pod (for control logic) or the target system (for oscillator reference); DVA18XP280 itself consumes no standalone power and does not require heatsinking or thermal derating.

Can the DVA18XP280 be used with modern MPLAB REAL ICE or PICkit debuggers?

No - the DVA18XP280 is mechanically and electrically designed exclusively for the legacy MPLAB ICE 2000 emulator system, including its specific flex circuit cable interface, pinout mapping, and processor module handshake protocol. It is incompatible with MPLAB REAL ICE, PICkit 3/4, or ICD 4 debuggers due to differing connector types, signaling voltages, and firmware-level communication requirements - DVA18XP280 has no functional role outside the MPLAB ICE 2000 ecosystem.