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Page 97 12 HPR1V2 HPR1V2 is an opt ional accessory to t he PRESTO programmer for programming of the devices with supply voltage and logical levels bet ween 1.2V an d 3.3V as for example Xilinx CoolRunner-II . The PREST…
Page 96
V
OL
output pin voltage log.0 (25°C)
0.36
V
I
OUT
output pin current
4
mA
Table13: Technical specification
Page 97
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!
Page 98
12.2
HPR1V2 schematics
Fig.31: HPR1V2 schematics
12.3
Technical specification
min.
max.
V
CC
supply voltage
1.2
3.3
V
V
IH
input pin voltage log.1
0.65xV
CC
V
V
IL
input pin voltage log.0
0.35xV
CC
V
I
OUT
output pin current
4
mA
Table14: Technical specification