an ISO9001 company 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 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. Revised 08/03 1 TECHNICAL INFORMATION FOR FIC98648 Introduction The FIC98648 is a microprocessor for handling signals from the TGS4160 carbon dioxide sensor, enabling maintenance-free automation of air quality control in buildings when connected with appliances such as ventilation fans, air cleaning systems, etc. The microprocessor takes in the output voltage, or electromotive force (EMF), from the TGS4160 sensor and outputs a signal which corresponds to a concentration of CO2 in the environment. CO2 concentrations are calculated in the microprocessor based on ∆EMF, which is the change in the value of EMF from the value in a normal clean environment. The microprocessor also contains software to compensate the sensor ’s signal for changes in temperature and basic environmental factors. 1. Features 1-1 Automatic calibration The FIC98648 uses the concept of a benchmark value of EMF in order to provide automatic calibration. The 1 XOUT benchmark value is assumed to be equal to the level of CO2 which exists in ambient air (approx. 400ppm). CO2 concentrations are calculated periodically by determining the change of EMF from the benchmark level (∆EMF). In order to offset the effects of sensor signal drift which are caused by environmental temperature and air contaminants, the microprocessor automatically renews the benchmark level to the current EMF value whenever a lower CO2 concentration than the current benchmark is calculated. Using this method of automatic calibration, very stable characteristics can be expected for the sensor, allowing for reliable monitoring of CO2 levels and long term maintenance-free ventilation control. 1-2 High CO2 sensitivity and wide detectable range of 400~3000ppm By programming the microprocessor to take into consideration the unique performance characteristics of the TGS4160, reliable readings of CO2 concentrations within a wide range (400~3000ppm) can be achieved, satisfying the requirements of building ventilation control applications. VDD 28 X-TAL Input port for +4.4V Input port for manual benchmark reset 2 XIN KEO 27 Input port for microprocessor reset 3 RESET R92 26 Output port for benchmark renewal status signal Input port for test mode 4 R70 R91 25 Output port for CO2 concentration signal Input port for +4.4V 5 R71 R90 24 Output port for bias signal Input port for +3.8V 6 VAREF R83 23 GND Gas sensor signal input port 7 AIN0 R82 22 GND Thermistor signal input port 8 AIN1 R81 21 GND Input port for damper control thresholds 9 AIN2 R80 20 GND Input port for setting warm up period 10 R43 R63 19 Output port for green LED Input port for setting benchmark renewal (VL) 11 R50 R62 18 Output port for red LED Input port for setting benchmark renewal (TK) 12 R51 R61 17 Output port for malfunction signal Input port for automatic benchmark reset (Tr) 13 R52 R60 16 Output port for damper control signal 14 VSS R53 15 GND GND Figure 1 - Pin arrangement for FIC98648 Revised 08/03 2 TECHNICAL INFORMATION FOR FIC98648 1-3 Two output signals FIC98648 generates two separate output signals: a) For calculating CO2 concentrations, a pulse width modulated (PWM) signal is output. b) An On/Off signal is generated as a control signal for devices such as ventilation fans, dampers, etc. 4-1 Pins for the initial setting of operational conditions To optimize sensor performance, the following pins are provided for setting operational conditions at the time of power-on. No change can be made to operational conditions after the initial setting without powering off and then repowering the device. Notes: 1) The microprocessor is designed to assume the highest value of EMF reading is representative of 400ppm of CO2 (ambient air levels). As a result, an accurate reading cannot be expected if the sensor is used in an environment where CO2 constantly exists at higher concentrations than can be found in a normal clean environment. 2) This device is not suitable for usage in life saving equipment. 4-1-1 Input signal for setting the sensor’s initial warmup time (Pin No. 10) Initial warm-up time, which is necessary to stabilize the sensor’s output signal after an unpowered period, is set by input of a signal to port R43 (see Table 2). No signal can be taken from the microprocessor’s output ports during initial warm-up time. 2. Basic Functions 2-1 Initial setting of operational conditions In order to achieve optimal performance of the sensor, manual preset of operational conditions is provided. 2-2 Automatic operation Once power is supplied, an initial warm-up timer is activated. When the initial warm-up time is finished, the microprocessor will automatically begin operation and commence generating the two output signals mentioned above. 2-3 Line test The microprocessor has the ability to perform a line test for checking the functionality of the microprocessor and the surrounding circuits. This allows users to eliminate tool testing which is normally done on the production line after assembly. 3. Pin Arrangement Pin arrangement of FIC98648 is shown in Figure 1. 4. Pin Functions The basic pin functions of FIC98648 are shown in Table 1 (shown on Page 4). Revised 08/03 Signal Input Setting Initial warm-up time (T1) "H" "L" 30 minutes 120 minutes Table 2 - Initial warm-up time setting (AM-4 default = "L") 4-1-2 Input signals VL and TK for benchmark adjustment (Pins No. 11 and 12) The benchmark level is normally set at the lowest value of the sensor’s signal (Vg), which is considered as 400ppm of CO2 (ambient levels). The benchmark level Vg is renewed whenever a lower signal voltage than the present benchmark level is read from the sensor (as described in Sec. 1-Automatic calibration). If the benchmark level Vg is not renewed for a preset period of time (TK), it is automatically adjusted upward by a pre-set voltage (VL) which corresponds to an equivalent concentration of CO2. Table 3 shows the user-determined settings for VL and TK which can be selected by applying a signal to Ports R50 and R51 respectively. Terminal Signal input Setting Symbol Pin No. "H" "L" Benchmark adjustment level (V L ) R50 11 5ppm equivalent 20ppm equivalent Benchmark adjustment time (TK) R51 12 1 day 7 days Table 3 - Benchmark adjustment level and timer setting (AM-4 default = 20ppm equiv. and 1 day) 3 TECHNICAL INFORMATION FOR FIC98648 Terminal Category Power Pin No. Power supply VDD 28 Connect to +4.4V power supply Ground VSS 14 Connect to ground Reference voltage VAREF 6 Connect to 3.8V power supply (Reference voltage for A/D converter) Reset RESET 3 Microprocessor reset when "L" is input for one machine cycle or longer XIN 2 XOUT 1 Initial warm-up time R43 10 Benchmark adjustment level (VL) R50 11 Benchmark adjustment time (TK) R51 12 Auto reset time R52 13 Gas sensor signal (Vg) AIN0 7 Input gas sensor signal (Vg) See Sec. 4-2 - Gas sensor signal Vg input Thermistor signal (VT) AIN1 8 Thermistor signal (VT) for temperature compensation circuit See Sec. 4-3 - Internal thermistor signal VT input Control signal threshold AIN2 9 Calibration of CO2 levels for damper control See Sec. 4-1-4 - Input signal for damper control Manual benchmark reset KEO 27 See Sec. 4-5 - Manual benchmark reset signal input Bias signal R90 24 See Sec. 4-4 - Bias signal output Damper control signal R60 16 See Sec. 4-6-2 - Damper control signal output CO2 concentration signal R91 25 See Sec. 4-6-1 - PWM signal output for CO2 concentration Green LED R63 19 See Sec. 4-7 - LED display signal output Red LED R62 18 See Sec. 4-7 - LED display signal output Test mode (Input) R70 4 See Sec. 4-10 - Line test mode Malfunction (Output) R61 17 See Sec. 4-8 - Malfunction signal output Benchmark renewal status (Output) R92 26 See Sec. 4-9 - Benchmark renewal status signal output Microprocessor control Clock in Clock out Switch input Signal output Other Connect to ceramic oscillator of 4.19MHz (ports to internal clock circuit) Input optional "H" or "L" signal See Sec. 4-1 - Pins for initial setting of operation conditions Settings Analog signal input Functions Symbol Name Table 1 - Pin functions of FIC98648 Revised 08/03 4 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 automatically 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. Signal Input Setting Auto reset time (Tr) "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 Cd1 (ppm) Cd2 (ppm) 0 - 48 800 720 49 - 96 1000 800 97 - 144 1500 1300 145 - 192 2000 1800 193 - 255 3000 2700 (AD converted: 0-255*) Cd1: Threshold for OPEN signal Cd2: Threshold for CLOSE signal * 8-bit - Least significant byte=3.8V/256 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 CO 2 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. 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 Revised 08/03 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 5 TECHNICAL INFORMATION FOR FIC98648 concentration readings. The pulse width against a cycle corresponds to the CO2 concentration as shown in Figure 2. This pulse width is then converted to an analog output voltage between 0 ~ 3V by the circuit (please refer to Sec. 5-4 - CO2 concentration circuit). 4-6-2 Damper control signal output (Pin No. 16) The output from port R60 is set to “H” under normal conditions in a clean environment, indicating that the damper should be closed. When a CO2 reading exceeds the preset level of the Open Damper Threshold (Cd1) as shown in Table 2, an “L” signal is output from port R60 as a signal for opening the damper. When CO2 drops below the preset level of the Close Damper Threshold (Cd2), the output from port R60 returns to an “H” signal for closing a damper. “H” is also output from port R60 during initial warm-up time and whenever a malfunction signal is output. 4-7 LED display signal output (Pin Nos. 18 & 19) The following LED display signals are output from port R62 (red LED) and port R63 (green LED): 4-7-1 Initial warm-up time During the initial warm-up period (see Sec. 4-1-1), an alternating H/L signal is output from port R63 every 0.5 seconds, causing the green LED to alternate between on and off every 0.5 seconds. “L” is output continuously from R62 during this period. 4-7-2 Normal operation mode When the CO2 concentration is lower than the preset threshold level for the damper control (Cd1), “L” is output from port R62 and “H” is output from the R63, causing the green LED to be lit continuously. Conversely, if the CO2 concentration is higher than the preset threshold level for the damper control (Cd1), “H” is output from port R62 and “L” is output from port R63, causing the red LED to be lit continuously. 4-7-3 Malfunction mode When a malfunction has been detected (see Sec. 4-8), an alternating H/L signal is output from port R62 every 0.5 seconds, causing the red LED to alternate between on and off every 0.5 seconds. “L” is output continuously from R63 during this period. Revised 08/03 H L A B C A: [(CO2 concentration) / 3000 ] x C Approx. 65 msec. B: C - [(CO2 concentration) / 3000] x C C: approx. 65msec. Figure 2 - PWM signal for CO2 concentration 4-8 Malfunction signal output (Pin No. 17) An “H” signal is output from port R61 under normal operation conditions. When a malfunction is detected on the gas sensor’s heater and/or the benchmark level Vg, an “L” signal is output from port R61. The following conditions would generate a malfunction signal: (a) Sensor heater breakage—when the thermistor’s signal (VT) remains at a level equivalent to 50°C or lower for over 10 seconds, the heater can be considered to have malfunctioned. Monitoring of this condition commences 30 minutes after powering on. (b) Benchmark level Vg malfunction—when the benchmark level Vg (gas sensor’s signal) cannot be adjusted in the range between 25 and 51 counts at AD converted value within 10 minutes after the adjustment is started, a malfunction is considered to have occurred. The relationship between signal output ports and their output signals under malfunction mode can be seen in Table 6. Terminal Signal Indication CO2 concentration signal (R91) “L” signal 0ppm Damper control signal (R60) “H” signal Close Red LED (R62) Alternate H/L signal (0.5 sec./0.5 sec.) On/Off Green LED (R63) “L” signal Off Bias signal (R90) Hold the level Off Table 6 - Malfunction signal 4-9 Benchmark renewal status signal output (Pin No. 26) When the benchmark level has been renewed, an “L” signal is output from port R92 for one second to indicate the status. An “H” signal is normally output from this port. 6 TECHNICAL INFORMATION FOR FIC98648 4-10 Line test mode (Pin No. 4) A line test mode can be activated by the input of an “L” signal to port R70 at the moment of power supply. Operation of the microprocessor and the surrounding circuits will be tested according to the schedule shown in Table 7. After powering on, signal outputs change from Step 1 to Step 4 according to the table, with Steps 1-3 lasting 5 seconds each. Afterwards, Step 4 outputs will be maintained continuously until the power is shut off. Terminal Signal Output Name Symbol Pin No. Step 1 Step 2 Step 3 Step 4 CO2 concentration signal R91 25 Cd1 (ppm) Note *1 Cd1 (ppm) Cd1 (ppm) Cd1 (ppm) Bias signal Note *2 R90 24 0 255 128 128 Green LED R63 19 L H (Note 3) H Red LED R62 18 H L (Note 4) H Damper control signal R60 16 H L (Note 5) H Malfunction R61 17 H L (Note 6) H Benchmark renewal status R92 26 H L H H Notes: (1) Please refer to Sec. 4-1-4 - Input signal for damper control (2) Please refer to Sec. 4-4 - Bias signal output (3) H or L, as input to Pin #10 for initial warmup setting - refer to Sec. 4-1-1 (4) H or L, as input to Pin #11 for benchmark adjustment - refer to Sec. 4-1-2 (5) H or L, as input to Pin #12 for benchmark adjustment - refer to Sec. 4-1-2 (6) H or L, as input to Pin #13 for benchmark reset - refer to Sec. 4-1-3 (7) Outputs shown are held until power is shut off Table 7 - Line test mode 5. Electrical Circuit for FIC98648 The following peripheral circuits are suggested when using the FIC98648 with the TGS4160 sensor. 5-1 Circuit for driving sensor and for processing sensor signals The block/circuit diagrams for driving the sensor and processing its signals are shown in Figure 3 (below) +3.8V +5V Thermistor signal (VT) Heater voltage (VH) FIC98648 Sensor voltage (EMF) Bias signal (PWM signal) Convert to DC and Figure 4 (Page 8) respectively. Please note the following items: a) +5.0V should be applied to Pin No. 6 for the heater of TGS4160. b) +3.8V is the specified voltage to sensor pin No. 5 for the built-in thermistor which is connected in series with an 8.2kΩ resistor. Output voltage across the 8.2kΩ resistor is designed to be input to port 4.5 times Buffer + amplification circuit circuit 10 times Regulation amplification + circuit circuit Buffer circuit Figure 3 - Block diagram for driving sensor and processing sensor signal Revised 08/03 7 TECHNICAL INFORMATION FOR FIC98648 FIC98648 AIN0 10k 7 10µ 104 +5V +3. 8V TLC271CP 8 3 6 5 2 3 7 220k 22k 6 9 10 4 LM324N SENSOR AIN1 8 2 30k 4 1 R90 8.2k 10k 24 47k 30k 10k 100p 103 + 4.4V 8 6 7 100k 5 1M 104 LM324N 1m Figure 4 - Circuit for driving sensor and processing sensor signal AIN1 (Pin No. 8) as a thermistor signal for the temperature compensation circuit. c) As a first stage, the sensor’s output (pin No. 3), which is of very high impedance, should be amplified by 4.5 times with a high impedance (100MΩ or higher) operational amplifier, such as Texas Instrument’s Model No. TLC271. This amplified signal is designed to be further amplified by ten times in the second stage. The output from the amplifier is input into port AIN0 (Pin No. 7) after being adjusted by a regulator (differential circuit) with a bias signal. 5-2 Power supply circuit As illustrated in Figure 5, the circuit is designed to be operated by +5V. The sensor’s heater, which requires a large current, is powered directly by +5V. The microprocessor is powered by +4.4V (downstream from a diode). A diode is connected between the power supply and the microprocessor to protect the microprocessor from a surge current. Taking the saturation voltage of the operational amplifiers into consideration, the analog reference voltage (VAREF) is set at +3.8V. Voltage is provided downstream from another diode. FIC98648 +4.4V +5V 1SS176 28 +3.8V 1SS176 6 5V 103 104 220 µ 6. 2V 220 µ VDD VAREF 2. 2k 14 VSS Figure 5 - Power supply circuit Revised 08/03 8 TECHNICAL INFORMATION FOR FIC98648 5-3 System reset circuit Under normal operating conditions, an “H” signal is continuously applied to the RESET port (Pin #3). When an “L” signal is applied to the RESET port for a period of one machine cycle or longer, the internal logic circuit of FIC98648 and the micro-processor’s program return to the same condition which exists just after powering on the unit, effectively resetting the system. +4.4V FIC98648 2SA1015Y 28 VDD 1k 104 3 RESET 3.9k 4. 7 k 103 14 To perform the above described system reset function automatically, a circuit such as that shown in Figure 6 is suggested. This kind of automatic system reset circuit is useful in circumstances such as just after powering on, after a momentary power interruption, at the moment of recovery after a sudden drop of voltage, etc. The microprocessor’s program sometimes does not run correctly in these cases due to a malfunction of the internal logic circuit in the processor. Manual resets help to assure normal operation of the microprocessor’s program. Figure 6 - Reset circuit DC. A delay of several seconds is anticipated in the DC voltage concentration signal because a C-R combination is used in the circuit. A 100Ω resistor is connected in series to protect the external circuit from excessive current. 5-5 Circuit for damper control signal Figure 8 shows an example circuit in which an H/L signal which is output from port R60 (Pin No. 16) and converted to an On/Off signal for controlling the opening/closing of a damper. A 100Ω resistor is connected in series to protect the external circuit from excessive current. 5-4 CO2 concentration signal circuit Port 91 (Pin No. 25) outputs a PWM signal which represents a CO2 concentration in the range between 400 and 3000ppm. Figure 7 illustrates a sample circuit for converting a PWM signal to a linear output of 0~3V 1M FIC98648 2 10k R91 VSS 1 25 1M 22k 3 100 10µ LM 324N Analog output (0~3V) for CO2 concentration 6.2V Figure 7 - CO2 concentration signal circuit 10k FIC98648 R60 2SA1015Y 16 100 1k Damper control signal 10k 6. 2V Figure 8 - Damper control circuit Revised 08/03 9 TECHNICAL INFORMATION FOR FIC98648 5-6 Circuit for manual benchmark reset A circuit designed to allow for manual benchmark reset is shown in Figure 9. +4.4V FIC98648 10k 27 KEO Figure 9 - Manual benchmark reset circuit 5-7 Circuit for clock signal generator When a ceramic oscillator is connected with the clock in and out ports, Xin and Xout (Pins No. 2 and 1 respectively), a clock signal is activated in FIC98648 by a built-in clock signal generator. A sample circuit for connecting such an oscillator is shown in Figure 10. Murata Electronics model CST4.19MGW is a well-matched ceramic oscillator for FIC98648. Before using a different oscillator, please consult with Figaro or the oscillator manufacturer. FIC98648 XIN XOUT 2 1 CST4. 19 MGW Figure 10 - Clock signal generator circuit +3. 8V 5-8 Circuit for damper control signal threshold A recommended circuit design for setting the damper control signal threshold can be seen in Figure 11. 1k JP 5-9 Sample circuit of damper control with TGS4160 and FIC98648 A sample application circuit for damper control when using a TGS4160 CO 2 sensor and a FIC98648 microprocessor is shown in Figure 12. Please refer to Technical Information for AM-4 for details. 4. 3k JP 10k JP 24k JP 100k FIC98648 9 AIN2 10k 103 Figure 11 - Damper control signal threshold circuit Revised 08/03 10 Revised 08/03 2 CN1 B2B-XH-A 0V 5V 1 R6 C14 104 C13 C1 104 220m ZD1 6.2V D1 1SS176 C2 220m JP8 R2 4.7k R1 1k R4 2.2k C5 103 R3 4.7k C3 103 2SA1015Y Q1 C4 104 D2 1SS176 R13 100k JP7 R14 10k R16 10k R12 24k R7 R8 R15 10k R11 10k JP6 JP1 JP2 JP3 JP4 R5 10k ~4 R24(8/8) 10k LED2 LED1 R24(2/8) 10k R10 4.3k SW1 SKHHAJ R19 750 JP5 R9 1k R24(1/8) 10k R18 470 2 X1 CST4.19MGW 14 3 28 6 13 12 11 10 9 5 4 26 17 27 18 19 FIC98648 (IC4 TMP47C243N) 1 15 23 16 25 R27 47k 24 8 7 20 21 22 5 R35 8.2k 1 C15 104 3 R20 10k 3 C6 10m 5 6 R37 30k 2 5 3 2 C16 104 IC2 1/4 LM324N ZD3 6.2V 3 2 1 11 0V 14 IC2 4/4 4 CN2 B3B-XH-A R23 100 12 13 104 C12 IC2 3/4 8 R40 220k R21 100 ZD2 6.2V 1 R26 1M IC2 2/4 7 C7 1m 9 R39 22k 10 R45 100k 6 C11 104 VR1 30k C9 100p 4 8 7 IC3 93LC468 8 Sensor pins 2,5 : thermistor " " 1,6 : heater " " 3,4 : sensor 2SA1015Y Q2 R43 10k 1 2 R36 10k 4 4 3 TLC271CP IC1 R24(7/8) 10k R22 1M R24(4/8) 10k R25 1M R24(4/8) 10k R44 1k R28 22k C8 103 2 6 R50 10k SENSOR1 C10 10m R24(5/8) 10k R24(6/8) 10k TECHNICAL INFORMATION FOR FIC98648 Figure 12 - Application circuit 11 TECHNICAL INFORMATION FOR FIC98648 *8-bit successive approximate type A/D converter with sample and hold - 8 analog inputs - Conversion time: 24µs (at 8MHz) *Serial Interface with 8-bit buffer - Simultaneous transmission and reception capability - 8/4-bit transfer, external/internal clock, and leading/trailing edge shift mode *Zero-cross detector (and external interrupt handler) *Pulse output - Buzzer drive/Remocon carrier *High current outputs - LED direct drive capacity: typ. 20mA x 8 bits (Ports R5, R6) *Reset function - Watchdog timer reset *Hold function - Battery/Capacitor back-up 6. Hardware Specifications 6-1 Features *4-bit single chip microcomputer *Instruction execution time: 1.0µs (at 8MHz) *Low voltage operation: 2.2V (at 4.2MHz) *Basic instructions: 92 - ROM table look-up instructions - 5-bit to 8-bit data conversion instruction *Subroutine nesting: 15 levels maximum *6 interrupt sources (External: 2, Internal: 4) - All sources each have independent latches, and multiple interrupt control is available *I/O port (23 pins) *Two 12-bit Timer/Counters - Timer, event counter, and pulse width measurement mode *Interval Timer *Emulation pod: BM47C443 6-2 DC characteristics (see Table 8) Parameter Symbol Pins Conditions Min. Typ. Max. Unit Hysteresis voltage VHS Hysteresis input - - 0.7 - V IIN1 RESET, HOLD VDD = 5.5V, VIN = 5.5V/0V - - IIN2 Open drain ports ±2 µA Input resistance RIN RESET - 100 220 450 kΩ Output leakage current ILO Open drain output ports VDD = 5.5 V, VOUT = 5.5 V - - 2 µA Output low voltage Ports R4, R7, R8, R9 VDD = 4.5V, IOL = 1.6mA - - 0.4 VOL VDD = 2.2V, IOL = 20µA - - 0.1 Output low current IOL Ports R5, R6 VDD = 4.5V, VOL = 1.0V 7 20 - VDD = 5.5V, fc = 4MHz - 2 4 VDD = 3.0V, fc = 4MHz - 1 2 VDD = 3.0V, fc = 400kHz - 0.5 1 VDD = 5.5V - 0.5 10 Input current Supply current (NORMAL operating mode) IDD Supply current (HOLD operating mode) IDDH - - V mA mA µA Table 8 - DC characteristics (Vss = 0, Topr = -30~+70˚C) Revised 08/03 12 TECHNICAL INFORMATION FOR FIC98648 6-3 A/D conversion characteristics (Table 9) Parameter Symbol Conditions Min. Typ. Max. Unit Analog reference voltage VAREF (Mask option) VDD - 1.5 - VDD V Analog reference voltage range ∆VAREF VAREF - Vss 2.7 - - V Analog input voltage VAIN - Vss - VDD V Analog supply current IREF - - 0.5 1.0 mA - - ±1 - - ±1 - - ±1 - - ±2 Nonlinearity error Zero point error - Full scale error VDD = 2.7 ~5.5V VAREF = VDD ± 0.001V Vss = 0.000V Total error LSB Table 9 - A/D conversion characteristics (Topr = -30~+70˚C) 6-4 AC characteristics (Table 10) Parameter Instruction Cycle Time High level clock pulse width Low level clock pulse width Symbol tcy tWCH tWCL Condition Min. VDD = 2.7~5.5V 1.0 VDD = 2.2~5.5V 1.9 in RC oscillation 3.2 For external clock (XIN input) VDD≥2.7V 60 VDD<2.7V 120 VDD≥2.7V 60 VDD<2.7V 120 Typ. Max. Unit - 20 µs - - ns A/D Conversion Time tADC - - 24tcy - A/D Sampling Time tAIN - - 2tcy - Shift data Hold Time tSDH - 0.5tcy-300 - - µs ns Table 9 - A/D conversion characteristics (Vss = 0, Topr = -30~+70˚C) Revised 08/03 13 TECHNICAL INFORMATION FOR FIC98648 6-5 Dimensions Dimensions of FIC98648 are shown in Figure 13. 15 1 14 0.25 +0.1 -0.05 10.16 8.8±0.2 0-15˚ 28 26.1 Max. 1.243 Typ 1.0±0.1 0.46±0.1 0.18 3.0±0.3 3.8±0.3 0.3 Min. 3.3±0.2 25.6 ± 0.2 M 1.778 Figure 13 - Dimensions of FIC98648 Figaro Engineering Inc. (Figaro) reserves the right to make changes without notice to any products herein to improve reliability, functioning or design. Information contained in this document is believed to be reliable. However, Figaro does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, nor the rights of others. Figaro's products are not authorized for use as critical components in life support applications wherein a failure or malfunction of the products may result in injury or threat to life. FIGARO GROUP Revised 08/03 HEAD OFFICE OVERSEAS Figaro Engineering Inc. 1-5-11 Senba-nishi Mino, Osaka 562 JAPAN Tel.: (81) 72-728-2561 Fax: (81) 72-728-0467 email: [email protected] Figaro USA Inc. 3703 West Lake Ave. Suite 203 Glenview, IL 60025 USA Tel.: (1) 847-832-1701 Fax.: (1) 847-832-1705 email: [email protected] 14