Universal Frequency-to-Digital
Converter
UFDC-1
FEATURES
16 measuring modes and one generator mode
2 channels for frequency and period
measurements
Provides frequency (time)-to-digital conversion
for many types of sensors and transducers
Frequency range from 0.05 Hz up to 7.5 MHz
without prescaling and 120 MHz with
prescaling;
Programmable accuracy (relative error) for
frequency (period) conversion from 1 % to
0.001%
Relative quantization error is constant in all
specified frequency range
Non-redundant conversion time
Scalable resolution
Internal reference clock 500 kHz
@ 16 MHz quartz oscillator
Quartz-accurate automated calibration
3-wire serial interface (SPI compatible)
2-wire interface (I
2
C compatible)
RS232/485 serial interface
Master and slave communication modes
Frequency generator mode 8 MHz with quartz
crystal stability
FUNCTIONAL BLOCK DIAGRAM
The UFDC-1 can be easy included into digital
environment, controlled by an external microcontroller
(slave mode) or work independently as a separate
measuring unit without an external control (master
mode). The function selection can be configured in
both software and hardware.
The IC converts frequency-time domain signals into
digital
domain
and
provides
interface
to
microcontroller, DAQ or sensor system to read these
digital results. resolution and programmable accuracy
during the non-redundant conversion time.
The UFDC-1 has 16 measuring and one generating
modes. The measuring mode can be hardware-
selected by using four selection external pins M0-M2
and the relative error by using four selection pins
N0-N2 (RS232 master communication mode). The
mode and accuracy can be also selected by using any
of three possible interfaces (slave communication
mode). A communication interface type (RS232, SPI or
I
2
C) can be automatically selected according to the
circuit connection.
APPLICATIONS
Physical and Chemical Sensor Systems
Digital Sensors, SoC, SiP
Smart and Intelligent Sensors and Systems
Industrial and Process Control
Data Acquisition Systems
Instrumentations
Customer Electronics
Automotive
GENERAL DESCRIPTION
The
Universal
Frequency-to-Digital
Converter
(UFDC-1) is a fully digital CMOS integrated circuit
based on novel patented methods for frequency,
period, its ratio, duty-cycle and phase-shift
measurements. By using this IC it is possible to build a
wide variety of digital, smart sensors and intelligent
sensor systems. The device represents a high-
resolution conversion for data acquisition systems
designed to support all range of frequency-time
domain and digital sensor applications. It offers high
performance with flexibility and requires minimum
possible number of external components.
MEASURING MODES
Frequency,
f
x1
0.05 Hz – 7.5 MHz directly and up to
120 MHz with prescaling
Period,
T
x1
150 ns – 20 s
Phase shift,
x
0 - 360
0
at
f
xmax
= 500 kHz at 50 %
duty-cycle
Time interval between start – and stop-pulse,
x
2
s
– 250 s
Duty-cycle, D.C. 0 – 1 at
f
xmax
500 kHz
Duty-off factor,
Q
10
-8
– 8
.
10
6
at
f
xmax
500 kHz
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
.
10
8
Period ratio,
T
x1
/T
x2
7.5
.
10
-9
– 1.33
.
10
8
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
.
10
9
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.
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).
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:
PIN FUNCTION DESCRIPTIONS
1
q
½
100%,
6
16
10
t
x
where
t
x
is the appropriate measuring value of
t
p
, t
s
or
x
depending on the mode.
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
MOSI
__
SS/TEST
N1
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 I
2
C. The UFDC-1 works
as a standard element in different systems with I
2
C
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.
TQFP/MLF TOP VIEW
UFDC-1
NOTE: Bottom Pad for MLF Package Should be
Soldered to Ground.
2
Table. 1
Pin Function Description for TQFP/MLF
packages.
Pin
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Function
FX2
ST1
GND
VCC
GND
VCC
OS1
OS2
ST2
N2
N3
N0
N1
SS/TEST
MOSI
MISO
Pin Number
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
Function
SCK
VCC
-
-
GND
-
A0 (M0)
A1 (M1)
A2 (M2)
M3
SDA
SCL
-
RXD
TDX
FX1
This device can also be supplied in wafer form. Please
contact Technology Assistance BCNA 2010 S. L. sales
office for detailed ordering information and minimum
quantities.
For more detailed information, specifications and
application notes the following document are strongly
recommended:
Universal
Frequency-to-Digital
Converter (UFDC-1): Specification and Application
Note
Technology Assistance BCNA 2010, S. L.
Riera de Tena, No. 9 Local 4, 08014,
Barcelona, Spain
Tel.:+34 680 282 682
E-mail: info@techassist2010.com
Web: http://www. techassist2010.com
3
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