UFDC-1 Datasheet, PDF (2/3 Pages) TECHNOLOGY ASSISTANCE BCNA 2010, S. L. – Universal Frequency-to-Digital Converter

 Frequency difference, f_x1 – f_x2 with sign recognition,
0 – 7.5 MHz
 Period difference, T_x1 – T_x2 with sign recognition,
0 – 20 s
 Frequency ratio, f_x1/f_x2 7 ^.10^-9 – 1.4 ^. 10⁸
 Period ratio, T_x1/T_x2 7.5 ^. 10^-9 – 1.33 ^. 10⁸
 Rotation speed, n_x = (f_x ^. 60)/Z, where Z is the
number of encoder teeth
 Pulse width, t_p 2 s – 250 s
 Space interval, t_s 2 s – 250 s
 Pulse number (events) counting, N_x 0 – 4^.10⁹
NOTE: The UFDC-1 can also work with any voltage
and current output sensors. It this case, any voltage–
to-frequency converter (VFC) can be used. The
accuracy of such system will be determined by sensor
accuracy as well as by VFC accuracy.
ACCURACY
The UFDC-1 has programmable relative error from 1
to 0.001 % in all specified range of frequencies for
frequency and period measurements. This error is
constant and does not depend on the measuring
frequencies in all frequency ranges. The UFDC-1 has
non-redundant conversion time. The higher conversion
accuracy needs longer conversion time. However, it is
non-redundant for any selected accuracy and
frequency. For time interval, phase shift, pulse width
and space measurements the relative error is
determined mainly by measurand and can be
calculated according to the following equation:
_q

1
16 10⁶
t_x
100%,
where tx is the appropriate measuring value of tp, ts or
x depending on the mode.
COMMUNICATION MODES
The UFDC-1 can work as an independent measuring
unit (master mode), controlled by any external
microcontroller (or embedded into a sensor), DAQ
board or PC (slave mode). In the master mode, the
conversion accuracy and measurement mode should
be selected by external switches. In this mode the
UFDC-1 works only through the RS232 interface in a
unidirectional mode. In the slave mode (with an
external microcontroller), all measuring modes and
programmed accuracy can be set up by a data bus or
through communication I/O ports of master
microcontroller. This allows us use the UFDC-1 as a
simple peripheral circuit for a microcontroller. A
bidirectional data exchange is possible with any of
three interfaces RS232, SPI or I²C. The UFDC-1 works
as a standard element in different systems with I²C
bus architecture, or can be controlled through the
RS232 or SPI interfaces. The choice of interface can
be performed automatically depend on the circuit
connections.
CHARACTERISTICS
 Single power supply, V: 4.5 – 5.5
 External reference frequency, MHz: 16
 Internal reference frequency, kHz: 500
 Conversion time, s: 0.0002 to 0.2
 Supply current (at 16 MHz, 4.5V, 25ºC), mA: 17.5
 Operating temperature range -40ºC to +85ºC
 Storage temperature range -65°C to +150°C
PIN-OUT AND HOUSING
The UFDC-1 is available in a 28-lead (0.300"/7.62 mm
Wide) Plastic Dual Inline Package (PDIP); 32-lead
7 x 7 mm Body Size, 1.0 mm Body Thickness, 0.8 mm
Lead Pitch small Thin Profile Plastic Quad Flat
Package (TQFP); and 32-pad, 5 x 5 x 1.0 mm Body,
Lead Pitch 0.50 mm, 3.10 mm Exposed Pad, Micro
Lead Frame Package (MLF).
PIN FUNCTION DESCRIPTIONS
RXD
TXD
FX1
FX2
ST1
VCC
GND
OS1
OS2
ST2
N2
N3
N0
UFDC-1
SCL
SDA
M3
A2 (M2)
A1 (M1)
A0 (M0)
GND
VCC
SCK
MISO
M__OSI
SS/TEST
N1
TQFP/MLF TOP VIEW
UFDC-1
NOTE: Bottom Pad for MLF Package Should be
Soldered to Ground.
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