NJU9214 NJR Corporation, NJU9214 Datasheet
NJU9214
Related parts for NJU9214
NJU9214 Summary of contents
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... DIGIT SINGLE CHIP DIGITAL MULTIMETER LSI GENERAL DESCRIPTION The NJU9214 3/4 digits single chip digital multimeter LSI with 42 segments bargraph display. The NJU9214 realizes high precision of ±40,000 counts measurement by the NJRC original dual-slope converter and realizes also quick response bargragh ...
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... NJU9214 BLOCK DIAGRAM A VDDA AGND VSSA +5.0V IVSL, IVSH DCV, ACV, VI ,CAP, VR2 to 7, DCmA, ACmA, OVH, FRQ, rpm OVX ADP COM SGND RMSIN RELAY RD1 to 4 CONT- ROLER FC1 to 4, KI1 to 5 KEY CONTROLLER TRX TXS RST PON KEY MATRIX REGURATOR ...
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... Key Mode Select Terminal In Range Control Mode Select Terminal In Range Select Terminal with Input Pull-up Resistance ( 300k I/O Function Select Terminal with Input Pull-up Resistance ( 300k Optional Function Control Terminal with Input Pull-up Resistance In ( 300k ) NJU9214 55 SEG16 50 SEG15 SEG14 SEG13 SEG12 SEG11 45 SEG10 ...
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... NJU9214 No. SYMBOL 26 PON 27 RST COM1 to COM4 SEG1 to SEG28 63 DSR 64 DTR 65 TXD XT2 68 XT1 69 VDSP 70 VSSD 71 SLEEP 72 VSSA 73 BLD 74, 75 CIF2, CIF1 76 BUF 77, 78 CL2, CH2 VREF3 VREF1 82, 83 CH1, CL1 84, 85 INT1, INT2 ...
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... FUNCTION DESCRIPTION (1) Measurement function Each measurement functions shown below is available with the NJU9214. MEASUREMENT FUNCTION DC/AC Voltage DC/AC Current DC/AC Current Resistance ( ) Frequency ( f ) Capacitance Tacho (rpm) Diode ( ) Continuity 400mV range ( selected in only manual range. 2 4mA-4000mA range has Auto / Manual – 2 range and Manual – 4 range mode, each mode needs its own application circuit. 3 ADP is applied for ° ...
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... As shown in Application circuits ( input protective diode must be connected with the OVH terminal. In resistance measurement, continuity test, diode check and capacitance mode, if the NJU9214 is supplied high voltage on the OVH terminal from the external, the NJU9214 may be broken completely. In the R1 ( 400 ) range, sometimes the resistor value shows wrong display because of the influence by test leads and wiring resistances of a circuit board ...
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... KMS Terminal Both of lock and push type application have the chattering protective function which reject the chattering less than 20ms. RMS Terminal SWITCH H Lock type L Push type NJU9214 RANGE Full Auto Manual Full Auto : ( Don't Care ) ...
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... NJU9214 (2-1) Lock type switch (2-1-1) Measurement function selection ( KMS = " H " ) The measurement function is set by FC1 to FC4 terminal. Excepting the following settings, all others select the DCV measurement mode. Measurement mode Resistance( ) Continuity ( ) Diode ( ) Capacitance ( ...
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... ADP, DCA and ACA measurement are always fixed f rpm 400 100Hz 6000 4k 1000Hz 60000 40k 10kHz 600k 400k 100kHz – 4000k 1000kHz – 40M – – C 400 4nF 4k 40nF 40k 400nF 400k 4uF 4000k 40uF 40M 400uF 400 4nF 400 4nF NJU9214 C 4nF 40nF 400nF 4uF 40uF 400uF ...
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... NJU9214 (2-2) Push type switch (2-2-1) Measurement function selection ( KMS = " L ", ARMS = " X " ) Measurement function is set to the mode depending on the below matrix table; FC1 FC2 Selection Terminals FC3 FC4 All switches excepting for the power switch should be used non-locked push type switch. ...
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... FIXED 5 Auto – range 3 Ri→Ri+1 (R →HOLD 6 ), diode check ( DCmA ACmA – – 40mA 40mA 400mA 400mA – – – – – – NJU9214 Range Control Range up 400mV to 4000V (R → 400mV to 4000V (R → →R ) 40mA to 400mA →R ) 40mA to 400mA ...
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... NJU9214 (3) Example of the Latching Relay Driver Circuit RD1 to RD4 are normally " H ". ( Active " L " ) GND COM 10A DCV, ACV CAP, DCmA, ACmA, FRQ, rpm, ADP VDDA VSSA SW Changing coil of latching relay RESET SET SW1 SW2 SW3 Sw4 and SW8 is used ...
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... This mode is released by pressing the READ key connecting to terminal KI5. Relay SW1 SW2 SW3 Set Set SW4 SW5 SW6 SW7 SW1 SW2 SW3 Reset Reset SW4 SW5 SW6 SW7 NJU9214 RD1 RD2 RD3 RD4 ...
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... To void this function, the power should be turned on with pressing the switch connecting to the PON terminal. The NJU9214 gets some voltage surges during the power off mode by the auto power off operation, it might not return to usual operation correctly. (4-8) Setting the mode at Power-on, Function and Range changing ...
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... Serial Data output The NJU9214 has terminals (TXD,DTR,DSR) for serial data output with RS-232C format requiring a external RS-232C I/F LSI. When the TRX terminal is " L " level, data transmission is available, and when DSR terminal is also " L " level, the data starts to output. ...
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... NJU9214 (5-3) RS-232C Data format As shown below table, the data transmitted through the RS-232C is structured with 1 frame consisting of 17 characters. ( Example ) DCV measurement value = 100mV (5-3-1) Function (5-3-2) Measurement Mode (5-3-3) Sign This sign shows the polarity of data. (5-3-4) DATA The data consists of six figures including a decimal point. ...
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... DCV, R=+000.01, □[CR] Unit Name Mega- Kilo- – Milli- Micro- Nano- Condition Normal Low-Buttery warning C V &H43 &H52 1 m &H31 &H6D 100.01mV 100.01mV - 100.00mV = 0.01mV NJU9214 Character M K □ ( Space ) m μ n Character □ ( Space ) B , &H2C • • • , □ &H2C &H20 [CR] &H0D ...
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... NJU9214 [ Ex DCV400mV range, when overflow is occurred on the positive voltage side by 401mV input. Measured value overflow on the " + " side Format pattern DCV, A □[CR] " . " shows overflow, "+" shows overflow on the positive side DCV400mV range, when overflow is occurred on the negative voltage side by -401mV input. ...
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... Reference voltage The resolution of NJU9214 is 25ppm ( 1/40000 ), and high precision is required for the reference power supply. The reference voltage requires a high precision and a temperature compensated type like as a band-gap reference. Reference voltages, VREF1 and VREF2 are about 0.2V, and VREF3 is about 1.4V. (7) Example of Display Layout ...
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... NJU9214 BP- BP0 0 BPN (7-4) Explanation of Display Mark 1. BATT : Low-Battery Detecting mark Displayed in DC voltage and DC current measurement mode Displayed in AC voltage and DC current measurement mode Displayed in DC voltage and DC current measurement negative input. This mark doesn't display in AC voltage, AC current, resistance frequency ( f ), diode ( 5 ...
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... Polarity Display In cases of the “ 0 “ display value, AC voltage, AC current, resistance ( frequency ( f ), tacho ( rpm ) and continuity test ( However in relative measurement mode, any measurement modes display " – " diode ( ) measurement mode, " – " mark is not displayed. NJU9214 ), capacitance ( C ), ...
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... NJU9214 ABSOLUTE MAXIMUM RATINGS PARAMETER Supply Voltage Range Control Terminal Voltage Analog Terminal Voltage Supply Terminal Terminal OVH Terminal Current Others Operating Temperature Storage Temperature Range VDDD and VDDA must be same voltage level. ELECTRICAL CHARACTERISTICS (1) DC Characteristics PARAMETER Operating Voltage Operating Current ...
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... TYP MAX 0.25 0.75 – –0.25 –0.75 – 0.5 1.0 – –0.5 –1.0 – –0.5 –1.0 – – 0.4 – – 5 – VIN=0mV – – ±10 – – ±40 –0.8 –1.0 –1.2 –1.8 –2.0 –2.2 –1.4 –1.6 –1.8 –3.1 –3.3 –3.5 NJU9214 UNIT NOTE ...
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... NOTE5 : Terminals of digital line are protected by the ESD protection circuit, however terminals of analog line aren't protected enough because the parasitic capacitance must be decreased. Therefore, if the NJU9214 is given static electricity, it may be permanent breakdown. Therefore enough external surge protection is needed for assembling, carrying and keeping. ...
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... SW2 9 0.99 0.01 SW1 SW5 SW7 0.022uF 0.1uF REL HOLD MAX NJU9214 / / / CAP Reference Voltage element : over 2.5V SW1 is ON. Temperature coefficient : below 20ppm/°C SW2 is ON. VDDA +5V 10K VSSA -5V VDDD +5V CIF1 80 75 CIF2 VSSD BLD VSSA ...
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... NJU9214 (2) Circuit using lock type switch ( Current Manual-4 range mode, RMS = " L " ) DCV, ACV CAP, DCmA, ACmA, FRQ, rpm AC measurement : AC coupling side SW7 DC400mV : VI side 0.022uF Others : VR2 side SW3 Rectification circuit block ACOUT 100 1 VDDA VDDA RMSIN VDDD VDDD ...
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... When ACmA/DCmA, ADP SW2 9 0.99 0.01 SW5 0.1uF REL HOLD MAX NJU9214 / / CAP, Reference Voltage element : over 2.5V SW1 is ON. Temperature coefficient : below 200ppm/°C SW2 is ON. VDDA +5V 10K VSSA -5V VDDD +5V CIF1 80 75 CIF2 VSSD BLD VSSA ...
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... Rectifier circuit block (5) Notes of application circuits 1. The power source for NJU9214 is required stable, and enough current drivability. 2. Capacitors marked with 1 require low-leak type like as the polypropylene film. 3. Resistance ratio precision of input attenuator block affects measurement precision. Resistances marked with 2 requires within 0.01% tolerance resistors or adjustment by the trimmer potentiometer ...