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Page 96 V O L o u t p u t p i n v o l t a g e l o g . 0 ( 2 5 ° C ) 0 . 3 6 V I O U T o u t p u t p i n c u r r e n t 4 m A Table13: Technical specification
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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
Page 96
V
OL
output pin voltage log.0 (25°C)
0.36
V
I
OUT
output pin current
4
mA
Table13: Technical specification
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12
HPR1V2
HPR1V2 is an optional accessory to the PRESTO
programmer for programming of the devices with supply
voltage and logical levels between 1.2V and 3.3V as for
example Xilinx CoolRunner-II .
The PRESTO programmer can program devices with signal
levels between 3 and 5V ± 10%, but sometimes it is
necessary to program a device with less signal levels. In
such case, the HPR1V2 level shifter have to be used. The
level shifter have to be used with external supply voltage
from application, it cannot be supplied from the
programmer.
12.1
Usage
Plug the HPR1V2 level shifter directly to the pins of the
PRESTO programmer (NOT to the programmed device
connector!). Pin2 is used as a key, so that it is not
possible to connect it a wrong way. Now, connect the
programmed device to HPR1V2 using ICSP cable.
Connection of the programmed device pins is the same as
connection of the device to the PRESTO. Common
connection diagram is below.
Fig.30: Use of HPR1V2
Important warning
The HPR1V2 pins are unidirectional, this level
shifter can be used for example with JTAG
devices, but it cannot be used with devices
that have save bidirectional signals on the
programming interface, like PIC
microcontrollers.
The HPR1V2 have to be supplied with external
supply voltage from application.
Never turn on the internal supply voltage
from the programmer, when the HPR1V2 is
connected!