参数资料
型号: ISPNANO S3 KIT
厂商: Equinox Technologies
文件页数: 81/134页
文件大小: 0K
描述: ISP PORTABLE PROGRAMMER
标准包装: 1
类型: 便携式 ISP
适用于相关产品: ATMEL AT90S、AT90CAN、AT90USB、ATtiny、ATmega、AT91SAM7xx、Zensys Z-Wave、24xxx 系列 EEPROM
所含物品: 编程器,线缆,电源
其它名称: 483-1022
ISPNANO S3 KIT-ND
Q5595084
T1310537
?
?
Discharging the Target Vcc to <200 mV also forces most target microcontrollers to perform a
‘Power-on-RESET’ which they would not perform if power had not been fully removed.
User-programmable ‘discharge timeout’ and ‘discharge voltage’
Please note:
Many microcontroller based target systems feature low-power microcontrollers and do not have a
resistive path to ground capable of discharging the reservoir capacitors on the board. This effectively
means that after the power is removed from the Target System, the Target Vcc rail may not decay for
minutes, hours and sometimes days. This has the effect of keeping power on the microcontroller so it
may keep running even after the power has been removed. It also means that there is a potential
ESD problem when the Target System is removed from the programmer.
For many target microcontrollers, the target voltage must drop below e.g. 400 mV before the on-chip
reset circuitry detects that power has been removed. If the power is not completely removed, then the
target device can either remain in programming mode after the next power-up or it may end up getting
stuck in a brown-out state where it never comes of reset. Using the ‘Target Discharge Circuit’
should prevent these problems from happening.
Scope trace showing the voltage decay with the ‘Target Discharge Circuit’ DISABLED….
The ‘Target Voltage’ decays from 3.0V to 0V in approximately 20ms.
ISPnano Series Programmer - User Manual – V1.11 – 12 May 2011
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