QW1 TechTools, QW1 Datasheet - Page 2

• Manufacturer Part Number: QW1
• Description: PROGRAMMER PIC MCU QUICKWRITER
• Manufacturer: TechTools
• Series: QuickWriter™r
• Type: QuickWriterr

Specifications of QW1

• Contents: MCU Programmer with In-Circuit Serial Programming Cable and Optional GANG Adapters
• For Use With/related Products: PIC Micro® MCU
• For Use With: CBL-ICSP - CABLE PROG QUICKWRITER SERIALQW-4SSOP18 - ADAPTER QUICKWRITER 4GANG 18SSOPQW-4SSOP28 - ADAPTER QUICKWRITER 4GANG 28SSOPQW-4SO8/14W - ADAPT QUICKWRTR 4GANG 8/14SOIC WQW-4SO8/14N - ADAPT QUICKWRTR 4GANG 8/14SOIC NQW-4SOIC18 - ADAPTER QUICKWRITER 4GANG 18SOICQW-4ZIF18 - ADAPTER QUICKWRITER 4-GANG 18ZIFQW-4SOIC28 - ADAPTER QUICKWRITER 4GANG 28SOICQW-4PLCC44 - ADAPTER QUICKWRITER 4GANG 44PLCCQW-4ZIF40/28 - ADAPT QUICKWRITER 4GANG 40/28ZIFMP-ZIF14 - ADAPTER QUICKWRITER 14-PIN ZIFMP-SOIC8/14 - ADAPTER QUICKWRITER 8/14-SOICMP-SSOP18 - ADAPTER QUICKWRITER 18-SSOPMP-SSOP28 - ADAPTER QUICKWRITER 28-SSOPMP-14000 - ADAPTR QUICKWRTR PIC14000 28-PINMP-SOIC18 - ADAPTER QUICKWRITER 18-SOICMP-SOIC28 - ADAPTER QUICKWRITER 28-SOICMP-PLCC44 - ADAPTER QUICKWRITER 44-PIN PLCCMP-ZIF18/28 - ADAPTER QUICKWRITER 18/28PIN ZIFMP-ZIF40 - ADAPTER QUICKWRITER 40-PIN ZIF

IMPLEMENTATION
QuickWriter is designed to make In-Circuit programming as hassle free as possible. It allows the
hardware and firmware developers to come as close to their ideals as possible and still do
reliable in-circuit programming. QuickWriter includes several features to support this.
High Dynamic and Static Drive
QuickWriter includes high dynamic current and static current capabilities on MCLR and VCC.
This allows it to over-come capacitance and loads on these circuits.
Inter-locked VPP and VCC enable/disable
QuickWriter monitors the voltage on the MCLR and VCC pins, allowing it to adapt to different
target loads. Each time QuickWriter enables or disables either of these signals, it monitors its
voltage to ensure it has risen or fallen fully before continuing to the next phase of the
programming algorithm. This interlock is crucial to reliable programming with a wide range of
power, load and capacitance variations in the target.
Target Monitoring
QuickWriter checks for error conditions and complains if it sees indications that the target is not
properly designed to do in-circuit programming safely. For example, it verifies that it can pull
MCLR low before starting. A failure here indicates a wiring problem or a very low value pull-up on
MCLR. QuickWriter verifies that when it turns on VCC, it rises to 5V +- .5 V within a reasonable
amount of time. A failure here would indicate improper wiring, excessive capacitance on VCC or
excessive loading on VCC. Similar checks are made when enabling MCLR. Additionally,
QuickWriter verifies that when MCLR is enabled, it does not drive VCC above its nominal level,
indicating that MCLR is too tightly coupled to VCC or that there is a wiring error.
Passive MCLR/VPP and VCC pull-downs
The MCLR and VCC drivers use active HIGH DRIVE but passive LOW DRIVE. This allows the
programmer to safely evaluate the target’s suitability for in-circuit programming before it applies
ANY power to the board. It also permits monitoring of interaction between the two power rails.