Hz to V click
PID:
MIKROE-2890
Weight:
27 g
Frequency-to-voltage converter with a linear response
HZ to V click
is a device that can convert input frequency of the signal with virtually any
wave shape to a DC voltage output, with a level proportional to the input frequency. It has a
linear response, and by applying a signal with the frequency between 10Hz and 10kHz on
its input, the Click board™ will generate a DC voltage, ranging
from 0V to 3.3V.
Hz to V
click features very good linearity, covers a wide input frequency range
from 10Hz to
10kHz
and it has good temperature stability.
These features allow this device to be used in various frequency to voltage applications: in
instrumentation, industrial, and automation markets. It is well suited for use in AD
conversion, long-term integration, frequency to voltage conversion, RPM measurement,
frequency demodulation and similar
applications which can benefit from an accurate
and reliable frequency to voltage conversion.
How does it work?
The main component of the Hz to V click is the TC9400, a voltage-to-frequency and
frequency-to-voltage converter from Microchip. It accepts a signal with the frequency
within a range between 10Hz and 10kHz on the input and generates DC voltage with the
level corresponding to the input frequency, ranging from 0V to 10V, with a highly linear
response. This signal is further passed through the operational amplifier, in order to scale it
down to a level acceptable by the MCU. The input signal can be applied either to the PWM
pin of the mikroBUS™ or the external input terminal. The input source can be selected with
the onboard switch, labeled as INPUT SEL.
When Hz to V click is operated for the first time, it needs to be calibrated. The click is
equipped with a variable resistor for the offset fine tuning. The following procedure should
be followed to calibrate the device:
•
An input signal with a frequency of 10Hz should be applied to the input. The offset should be
adjusted so that a 10mV DC signal appears on the output.
HZ to V click is equipped with the input signal terminal (FREQ IN), which is used to connect
the signal with a frequency which is in the acceptable range between 10Hz and 10kHz.
Besides this signal input terminal, it is possible to select the PWM signal generated by the
host MCU as the input, too. INPUT SEL switch can be set so that the PWM pin from the
mikroBUS™ is used as the control voltage input. It is recommended that the signal
amplitude does not exceed 3.3V.
The output terminal (VOLT OUT) is used to output the generated voltage. As already
explained, the voltage level depends on the input signal frequency. This generated voltage
is also available on the AN pin of the mikroBUS™. The output signal is passed through the
operational amplifier (OPAMP) which is used both as the output buffer and a voltage adjust
stage for the output voltage. A well known general purpose operational amplifier LM318
from Texas Instruments is used for this purpose.
To provide 12V for the TC9400 and the LM318 OPAMP, Hz to V click employs a boost
converter built around the MIC2606, a boost regulator from Microchip, which works at
2MHz. This IC provides 12V for supplying the TC9400 out of 5V routed from the
mikroBUS™ socket. The EN pin of the boost regulator is routed to the mikroBUS™ CS pin
and it is used to enable power output from the boost regulator, effectively enabling the
TC9400 itself. The EN pin is pulled to a HIGH logic level (3.3V) by the onboard resistor.
Specifications
Type
Measurements
Hz to V is well suited for use in AD conversion, long-term
Applications
integration, frequency to voltage conversion, RPM measurement,
frequency demodulation and similar applications which can benefit
from an accurate and reliable frequency to voltage conversion.
TC9400 Voltage-to-Frequency / Frequency-to-Voltage Converters,
On-board
modules
MIC2605/6 a 1.2MHz/2MHz, PWM DC/DC Boost Switching
Regulator, both from Microchip, LM318, a dual opamp from Texas
Instruments
Hz to V click features very good linearity, covers a frequency range
from 10Hz to 10kHz and it has good temperature stability.
3.3V,5V
Key Features
Input Voltage
Click board
size
L (57.15 x 25.4 mm)
Pinout diagram
This table shows how the pinout on
Hz to V click
corresponds to the pinout on the
mikroBUS™ socket (the latter shown in the two middle columns).
Notes
Pin
Pin
Notes
Voltage Out
VO
NC
1
2
3
4
5
6
7
8
AN
RST
CS
SCK
MISO
MOSI
3.3V
GND
PWM
INT
RX
TX
SCL
SDA
5V
GND
16
15
14
13
12
11
10
9
FIN
NC
NC
NC
NC
NC
+5V
GND
Frequency In
Chip Enable
EN
NC
NC
NC
Power Supply
Ground
+3.3V
GND
Power Supply
Ground
Onboard settings and indicators
Label
LD1
TB1
Name
PWR
FREQ IN
Default
-
-
Description
Power indication LED
Frequency input terminal
TB2
VOLT OUT
-
Voltage output terminal
Hz to V click electrical specifications
Description
Input Signal Amplitude
Input Frequency
Output Voltage Level
Min
-
10
0
Typ
3.3
-
-
Max
-
10,000
3.3
Unit
V
Hz
V
Software support
We provide a library for Hz to V click on our LibStock page, as well as a demo application
(example), developed using MikroElektronika compilers and mikroSDK. The provided click
library is mikroSDK standard compliant. The demo application can run on all the main
MikroElektronika development boards.
Examples Description
The demo application shows how to control the Hz to V click using MCU's PWM module.
The demo application is composed of two sections:
•
•
Application Task - Alternates between different output voltages.
hz2v_setOutputVoltage - Sets the PWM frequency to the required value, changing the
output voltage.
//Sets the output voltage in millivolts
void hz2v_setOutputVoltage(uint16_t voltage)
{
pwmPeriod = PWM_TIM5_Init(voltage*2);
PWM_TIM5_Set_Duty(pwmPeriod/2, _PWM_NON_INVERTED, _PWM_CHANNEL1);
PWM_TIM5_Start(_PWM_CHANNEL1, &_GPIO_MODULE_TIM5_CH1_PA0);
}
void applicationTask()
{
hz2v_setOutputVoltage(5000); //5 V output
Delay_ms(3000);
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