|
|
PDF FIC98648 Data sheet ( Hoja de datos )
| Número de pieza | FIC98648 | |
| Descripción | Microprocessor | |
| Fabricantes | ETC | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de FIC98648 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
|
No Preview Available !
www.DataSheet4U.com
TECHNICAL INFORMATION FOR FIC98648
Technical Information for FIC98648--microprocessor for
use with TGS4160 in automatic CO2 monitors
The FIC98648 is a microprocessor
for handling signals from the
TGS4160 carbon dioxide sensor.
This microprocessor enables
maintenance-free automation of
the air quality control in buildings
when connected with appliances
such as ventilation fans, air
cleaning systems, etc.
Page
Introduction.........................................................................................2
Features................................................................................................2
Basic Function...............................................................................................3
Pin Arrangement...........................................................................................3
Pin Functions
Pins for the initial setting of operational conditions....................................3
Gas sensor signal Vg input .........................................................................5
Internal thermistor signal VT input ...........................................................5
Bias signal output......................................................................................5
Manual benchmark reset signal input........................................................5
Sensor signal output....................................................................................5
LED display signal output..........................................................................6
Malfunction signal output.........................................................................6
Benchmark renewal status signal output........................................................6
Line test mode...........................................................................................7
Electrical Circuits for FIC98648........................................................................7
Hardware Specifications....................................................................................12
Revised 08/03
IMPORTANT NOTE: OPERATING CONDITIONS IN WHICH FIGARO SENSORS ARE USED WILL VARY
WITH EACH CUSTOMER’S SPECIFIC APPLICATIONS. FIGARO STRONGLY RECOMMENDS
CONSULTING OUR TECHNICAL STAFF BEFORE DEPLOYING FIGARO SENSORS IN YOUR APPLICATION
AND, IN PARTICULAR, WHEN CUSTOMER’S TARGET GASES ARE NOT LISTED HEREIN. FIGARO
CANNOT ASSUME ANY RESPONSIBILITY FOR ANY USE OF ITS SENSORS IN A PRODUCT OR
APPLICATION FOR WHICH SENSOR HAS NOT BEEN SPECIFICALLY TESTED BY FIGARO.
1
1 page  
www.DataSheet4U.com
TECHNICAL INFORMATION FOR FIC98648
4-1-3 Input signal Tr for automatic benchmark reset (Pin
No. 13)
Whenever the benchmark level Vg has only been
adjusted (Sec. 4-1-2) and has not been renewed (Sec.
1-1) for a pre-set period of time (Tr), it should be auto-
matically reset at the current output signal in ambient
air. Table 4 shows the time intervals (Tr) which can
be pre-set by applying a signal to Port R52.
Setting
Auto reset time
(Tr)
Signal Input
"H" "L"
7 days
30 days
Table 4 - Auto reset timer setting (AM-4 default = 7 days)
4-1-4 Input signal for damper control (Pin No. 9)
Concentration levels of CO2 at which the damper
control signals are activated are selected by inputting
a voltage signal to port AIN2. Sensor output voltage
is first AD converted within the microprocessor. The
relationship between these AD converted values and
CO2 concentrations is shown in Table 5. Whenever a
CO2 concentration exceeds the threshold level for
opening the damper (Cd1), a low signal (L) is output
from port R60. A high signal (H) is output for closing
the damper when the CO2 concentration drops
beneath the Cd2 level. Figure 11 shows the circuit
for damper control signal threshold. Please note that
a high signal (H) is designed to be output during the
sensor’s initial warm-up period and also whenever
the malfunction signal is activated.
Signal input
(AD converted: 0-255*)
0 - 48
49 - 96
97 - 144
145 - 192
193 - 255
Cd1 (ppm)
800
1000
1500
2000
3000
Cd2 (ppm)
720
800
1300
1800
2700
Cd1: Threshold for OPEN signal
Cd2: Threshold for CLOSE signal
* 8-bit - Least significant byte=3.8V/256
Table 5 - Thresholds for damper OPEN/CLOSE signal
4-2 Gas sensor signal Vg input (Pin No. 7)
Since the raw sensor output voltage (EMF) actually
decreases as CO2 concentration increases, the sensor’s
output voltage is reversed, amplified and adjusted
(please refer to Figure 3, Sec. 4-4, and Sec. 5-1 for
details). The result of this process is a gas sensor signal
Vg with good resolution and which increases/
decreases as CO2 concentration increases/decreases.
This gas sensor signal Vg is input to port AIN0.
4-3 Internal thermistor signal VT input (Pin No. 8)
To compensate for the temperature dependency of
CO2 sensor, a signal from the sensor ’s internal
thermistor (VT) is input to port AIN1. This thermistor
also monitors the sensor’s built-in heater from 30
minutes after powering and after. By detecting a
sharp drop in the sensor’s internal temperature
indicative of a broken heater, the thermistor can cause
a malfunction signal to be generated by the
microprocessor.
4-4 Bias signal output (Pin No. 24)
A PWM signal, of which the pulse width is variable,
is output from port R90. To optimize the resolution
of Vg readings, this signal is introduced to the
differential circuit after being converted to an analog
voltage, and adjusts the benchmark level Vg to fall
between 25 and 51 counts at AD converted value, or
0.38 ~ 0.75V at 3.8V full scale. The bias signal starts
from 128 counts (1.9V at 3.8V full scale) when the
power is switched on, and reduces the count stepwise
along with the sensor’s initial action until Vg falls
and then stabilizes at the above stated level.
4-5 Manual benchmark reset signal input (Pin No. 27)
The benchmark level can be reset manually at any
time by inputting an “L” pulse to port KEO. This
manual benchmark reset should be done in a clean
atmosphere where the CO2 concentration is about
400ppm (please refer to Sec. 5-6 - Benchmark reset
circuit).
Note: If the benchmark level is manually reset under
a high CO2 concentration environment, the device’s
sensitivity would be decreased and calculated CO2
concentration values would be less than the actual
concentration.
4-6 Sensor signal output
4-6-1 PWM signal output for CO2 concentration (Pin No. 25)
A PWM signal is output from port R91 to show CO2
Revised 08/03
5
5 Page 
www.DataSheet4U.com
TECHNICAL INFORMATION FOR FIC98648
Revised 08/03
Figure 12 - Application circuit
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet FIC98648.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| FIC98648 | Microprocessor | ETC |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |