presto_en.pdf - 第95页
Page 95 11 HPR3V3 HPR3V3 is an opt ional accessory to t he PRESTO programmer for p rogramming o f stan d-alone 3.3V devices as for example DataFlash Memories. The PRESTO programmer can supply a prog rammed d evice with …
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Fig.27: Tester PRESTO
After you start the tester, make sure that the
programmer's output buffers are fed. You can either use
the 5VfromUSB option or connect an external power-
supply voltage to the VDD pin. The level of detected
voltage is displayed in the lower part of the VDD&AUX
panel.
Basic communication with the programmer can easily be
recognized by the Active diode being on. You can also
use the Test ➙ USB Flood Test menu option, which
tests the USB communication with the programmer in
both directions.
The programmer's serial number is displayed in the
window title bar. This number is necessary for any
communication with the service shop. You can also find
this number on the bar code label attached to the
programmer bottom.
Now you can switch logical levels for individual output
pins (pins P, D, D and L) and check the output signal
quality using a voltmeter. At the same time, the input
pins (pins P, D, I and L) indicate what logical level is
currently seen by the programmer.
In addition, a pull-up resistor may be connected to pin D.
This means that if its output is in the Tristate mode, pin D
starts reading log.1.
The programming voltage of 13V can be connected to
the output of pin P.
If everything seems to be in order, but the device still fails
to get programmed, it is recommended to check the
application connection according to instructions for
connecting a microcontroller to the programmer.
If in doubt as to whether the programmer is in order or
faulty, do not hesitate to contact our technical support.
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11
HPR3V3
HPR3V3 is an optional accessory to the PRESTO
programmer for programming of stand-alone 3.3V
devices as for example DataFlash Memories. The PRESTO
programmer can supply a programmed device with 5V.
However, some devices require 3.3V supply voltage and
3.3V logic levels on their pins. In such case, the HPR3V3
level shifter or an external 3.3V power supply have to be
used.
11.1
Usage
Plug the HPR3V3 level shifter directly to the pins of the
PRESTO programmer (NOT to the programmed device
connector!). Pin 2 is used as a key, so that it is not
possible to connect it wrong way. Now, connect the
programmed device to HPR3V3 using ICSP cable.
Connection of the programmed device pins is the same as
connection of the device to PRESTO.
Common connection diagram is below.
Fig.28: Use of HPR3V3
Set internal power supply for programming.
Important warnings
The HPR3V3 pins are unidirectional, so this
level shifter can be used for devices with
unidirection signals like SPI Flash memories,
AVR devices or MSP430 devices without SBW
interface, but it cannot be used for PIC
devices or MSP430 devices with SBW
interface.
Never connect an external voltage to the
output 3.3V supply pins!
11.2
HPR3V3 schematics
Fig.29: HPR3V3 schematics
11.3
Technical specification
min.
typ.
max.
V
CC
output supply voltage
3.2
3.3
3.37
V
I
CC
output supply current
90
mA
V
OH
output pin voltage log.1
2.9
V
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V
OL
output pin voltage log.0 (25°C)
0.36
V
I
OUT
output pin current
4
mA
Table13: Technical specification