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NJU9214
PRELIMINARY 4*3/4 DIGIT SINGLE CHIP DIGITAL MULTIMETER LSI
! GENERAL DESCRIPTION
The NJU9214 is a 4*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 A to D converter and realizes also quick response bargragh display and auto-ranging by another high speed dual-slope A to D converter. The input attenuator part is simplified because the resistor for resistance measurement is applied for voltage bleeder resistor. Furthermore, the NJU9214 realizes root-mean-square measurement for AC voltage and current by connecting a External RMS-DC Converter, and Data output by the on chip RS-232C interface circuit. The NJU9214 is suitable for high precision and high performance multimeter.
PACKAGE OUTLINE
NJU9214FG1
! FEATURES
* 4*3/4 Digit Display (Available for UP to 39,999 Display) * 42 Segments Quick Response Bargraph Display * NJRC Original Dual-Slope A to D Converter (40,000Counts) * High Speed Dual-Slope A to D Converter (400Counts) * Quick Response Auto-Ranging (20times/sec) * Frequency/Capacitance/Tachometer/Adapter Measurement * Root-Mean-Square Measurement by connecting a External RMS-DC Converter * External Relay Driving * Data Memory/Data Hold/Relative Display/MAX, MIN Display * Power-on Initializing * Auto Power-off * Buttery Life Detector * Rotary/Push SW Mode Selection * 1/4 Duty LCD Display Driver * Piezo Buzzer Direct Driving * RS-232C Interface * External Reference Input required * Low Operating Current * C-MOS Technology * Package Outline TQFP100
NJU9214
!BLOCK DIAGRAM
REGURATOR
REFERENCE
VREF1
VREF2
RESISTORS and SWITCHS
VDDA AGND VSSA +5.0V 0V -5.0V IVSL, IVSL, IVSH VI, VI, VR2 to 7, OVH, OVH, OVX ADP SGND
VDDD VSSD 0V 5.0V
VREF3
A
EXTERNAL
SWITCH NETWORK
DCV, ACV, DCV, ACV, ,CAP CAP, , , ,CAP, DCmA, ACmA, DCmA, ACmA, FRQ, FRQ, rpm
REFERENCE BUFFER
BATT LOW DETECTOR
FRQ
ANALOG SECTION
COM
HIGH SPEED A/D SECTION
HIGH RESOLUTION A/D SECTION
CAPACITOR A/D SECTION
BUFFER
CONVERTER
RMS-DC
RMSIN
SWITCH NETWORK I/F
HIGH SPEED A/D I/F
HIGH RESOLUTION A/D I/F
RD1 to 4
RELAY CONTROLER
SWITCH NETWORK CONTROLER
HIGH SPEED A/D CONTROLER
HIGH RESOLUTION A/D CONTROLER
POWER ON INITIALIZE
DIGITAL SECTION
4bitBUS FC1 to 4, KI1 to 5
KEY
CONTROLE
RS232C
CONTROLER
BUZZER
CONTROLER CONTROLE
4bit CPU
LCD CONTROLER
LCD DRIVER and
TXD DTR DSR
TRX TXS RST PON KEY MATRIX
TEST
OSC
POWER
BZ BUZZER
COM1 to 4
SEG1 to 28
T1 to T3
XT1
XT2
RS232C DRIVER
LCD
NJU9214
! PIN CONFIGURATION
VSSA SLEEP SEG28 SEG27 SEG26 SEG25 SEG24 SEG23 SEG22 SEG21 SEG20 SEG19 SEG18 SEG17 VSSD VDSP CIF2 CIF1 DTR DSR TXD
65
BLD
XT1
BUF CL2 CH2 VREF3 VREF2 VREF1 CH1 CL1 INT1 INT2 SGND2 SGND1 AGND IVSH IVSL ADP OVX OVH VR7 VR6 VR5 VR4 VR3 VR2 V1
75
70
XT2 BZ
60
55
50
SEG16 SEG15 SEG14 SEG13
80 45
SEG12 SEG11 SEG10 SEG9 SEG8
85 40
NJU9214FG1
90 35
SEG7 SEG6 SEG5 SEG4 SEG3 SEG2 SEG1 COM4 COM3 CMO2 COM1 T3 T2 T1 RST PON
95 30
100 1
5
10
15
20
25
ACOUT
RMSIN
VDDD
VDDA
RD1 RD2
RD3 RD4
RC0 RC1
RC2
RC3 FC1 FC2
TRX
FC4 KI1
KI2 KI3 KI4
RMS
TXS
KMS
! TERMINAL DESCRIPTION
No. 1 2 3 4 5 to 8 9 10 11 12 13 to 20 17 to 20 21 to 25 SYMBOL AC OUT VD D A RMSIN VD D D RD 1 to RD 4 TXS TRX KMS RMS RC 0 to RC 3 FC 1 to FC 4 KI1 to KI5 I/O Out In Out In In In In In I/O In FUNC TION Attenuator output termi nal (used at AC A, AC mA, FRQ, rpm) Analog VD D (VD D A = 5.0 0.25V) RMS-Voltage Input T rmi nal e D i gi tal VD D (VD D D = 5.0 0.25V) Relay D ri vi ng T rmi nal e RS232C Output-Rate Select T rmi nal L ; 9600bps H ; 2400bps e RS232C Functi on Select T rmi nal e Key Mode Select T rmi nal e Range C ontrol Mode Select T rmi nal e Range Select T rmi nal wi th Input Pull-up Resi stance (300k) e Functi on Select T rmi nal wi th Input Pull-up Resi stance (300k) e Opti onal Functi on C ontrol T rmi nal wi th Input Pull-up Resi stance (300k) e
FC3
KI5
NJU9214
No. 26 27 28 to 30 SYMBOL PON RST T1 to T3 I/O In In In Out Out In Out Out Out Out In I/0 Out In I/0 Out I/0 F UNC TION Auto Power-off Mode Release Terminal with Input Pull-up Resistance (300k) System Reset Terminal with Input Pull-up Resistance(10k) Test Terminal with Input Pull-up Resistance (300k) LCD Common Terminal LCD Segment Terminal RS232C Data Set Ready Terminal RS232C Data-Terminal Terminal RS232C Data Output Terminal Piezo Buzzer Driving Terminal Crystal oscillation Inverter (Output) Crystal oscillation Inverter (Input) LCD driving voltage I/O Terminal Opened : VDSP=(VDDD-VSSD) X 3/5 Connected to VSSD : VDSP=(VDDD-VSSD) Digital VSS VSSD=0V Auto Power-off signal Terminal (Power-off:"H" Level) Analog VSS VSSA=-5.0V Buttery Life Detector Terminal, Detection: BLD<4.0V High-speed integration capacitor connecting Terminal High-speed integrator buffer output Terminal High-speed integrator reference capacitor connecting Terminal VREF1:High-accurate integrator reference voltage input Terminal VREF2:High-speed integrator reference voltage input Terminal VREF3:Capacitance measurement integrator reference voltage input Terminal High-accurate integrator Reference capacitor connecting Terminal CL1;"-",CH1;"+" High-accurate integrator capacitor connecting Terminal Analog sensing Terminal Analog GND Terminal Current measurement (A) sensing Terminal Current measurement (mA) sensing Terminal Adapter input Terminal Sensing Terminal (Resistance,Continuity,Capacitance) Voltage supply Termina l(Resistance,Continuity,Diode,Capacitance) Bleeder Resistance Terminal for 4V,40V range Bleeder Resistance Terminal for 400 renge Bleeder Resistance Terminal for 4000V,4k renge Bleeder Resistance Terminal for 400V,40k renge Bleeder Resistance Terminal for 40V,400k renge Bleeder Resistance Terminal for 4V,4000k renge Voltage input Terminal for 400mV range
31 to 34 COM1 to COM4 35 to 62 SEG1 to SEG28 63 64 65 66 67 68 69 70 71 72 73 74,75 76 77,78 D SR DTR TXD BZ XT2 XT1 VD SP VSSD S LE E P VSSA B LD CIF2, CIF1 BUF CL2, CH2 VREF3 to VREF1 CH1, CL1 INT1, INT2 SGND2, SGND1 AGND IVSH IVSL AD P OVX OVH VR7 VR6 VR5 VR4 VR3 VR2 VI
79 to 81
In
82,83 84,85 86,87 88 89 90 91 92 93 94 95 96 97 98 99 100
I/0 I/0 In In In In In Out I/0 I/0 I/0 I/0 I/0 I/0 In
NJU9214
! 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 (C) Tacho (rpm) D i ode( ) Continuity( AD P ) RANGE 400mV to 4000V 4mA to 4000mA 40A 400 to 40M 100Hz to 1000kHz 4nF to 400F 6000rpm to 600Krpm Auto/Manual Auto:4-range/Manual:5-range Auto*Manual-2range/Manual-4range Fixed Auto:6-range/Manual:6-range Auto:5-range Auto:6-range/Manual:6-range Auto:3-range Fixed Fixed Fixed *3 *1 *2
*1 400mV range (AC/DC) is selected in only manual range. *2 4mA-4000mA range has Auto/Manual-2range and Manual-4range mode, each mode needs its own application circuit. *3 ADP is applied for C, hfe and other measurement.
( 1 - 1 ) Voltage (DCV, ACV) measurements The divided voltages which are output from each resistance R1 to R5 shown in following table are supplied to A/ D converter. In the AC measurement, after the dividing voltage, these output voltages are converted to DC Voltages with the external RMS/DC converter. This DC voltage is supplied into A/D converter. 10M resistor for input terminal may be easy to be affected by noises. Therefore 10M and peripheral circuits require some protection like shields and so on for stable display. The resistors for attenuating should be selected with a flat temperature characteristic. Especially, the resistors (10M, 10k, 1k) for 400V, 4000V ranges should be selected carefully. For example, when 4,000V is input, 0.4mA (4,000V/10M) flow through 10M, and the resistor consumes power of 1.6W (4,000Vx0.4mA) and the temperature of the reference resistor. After measuring at 400V, 4,000V ranges, sometimes the uncorrect value is shown on the display at 4V, 40V ranges because the value of resister as the attenuator is changed by the temperature.
RANGE R1(400mV) R2(4V) R3(40V) R4(400V) R5(4000V)
DIVISION RATE 1 1M/10M 100k /10M 10K /10M 1k/10M
NJU9214
( 1 - 2 ) Resistance measurement() As shown below, six type resistors ( 10M,1M,100k,10k,1k,100 ) connecting VR2 to VR7 are used for reference resistors of each range. The output voltage on the measurement terminal is almost same as the voltage inputted Vref3. As shown in Application circuits (1) to (3), an 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. In this case, it needs to adjust on the relative function using the 0 resistance. In the R6 (40M) range, it may take a time to get the correct measurement value by the influence of parasitic capacitance and may not show the stable value by the noise effects.
RANGE R1(400) R2(4K) R3(40K) R4(400K) R5(4000K) R6(40K)
Refer.Resistance Value 100 1 k 1 0 k 1 0 0 k 1M 10M
( 1 - 3 ) Continuity test(
)
The input attenuator is fixed to 400 range of the resistance measurement mode. When the value is less than 40, the buzzer sounds. The output voltage on the measurement terminal is about 0.4V. If the display doesn't show 0 by resistances of lead wire when the terminals are shorted, this case requires adjustment at 0 using the relative function.
( 1 - 4 ) Diode check(
)
The input attenuator is fixed to DC4V range. The output voltage on the OVH terminal is about 5V (VDDA), and it is supplied to the measurement terminal through the SW1 (external switch or relay).
( 1 - 5 ) Current ( DCmA, ACmA ) measurement Current measurement provides the Auto-Manual 2-range mode(RMS=H) and the Manual 4-range mode (RMS=L). These are changed by status of the RMS terminal. Each mode needs its own application circuit. In the Auto-manual 2-range mode, the sense terminal is IVSL terminal at the 40mA range and IVSH terminal at the 400mA range. In the Manual 4-range mode, the sense terminal is IVSL. In this mode, switching range is performed by changing the reference resistors. The SW for the reference resistor change must be operated together with the SWs connecting to ' RC1 to RC3 '. ( Refer to ( 2 - 1 - 3 ) ) ( 1 - 6 ) Current ( DCA, ACA ) measurement It is fixed to the 40A range. The sense terminal is the IVSH terminal.
NJU9214
( 1 - 7 ) Frequency ( f ) measurement The input voltage is divided by the attenuator, and then the attenuator output is supplied to counter through the buffer. The divided voltage is converted to DC voltage by the external RMS/DC converter, and the dividing voltage ratio of the input attenuator is changed by this DC voltage, Noises or distorted waveforms sometimes show different display against actual frequency. The frequency range is always fixed to the Auto-range mode. It is able to switch from 100Hz to 1,000kHz and the measurement cycle is 1 time a second. ( 1 - 8 ) RPM measurement It is possible to measure numbers of revolution like as the revolutions of engine. The measurement is same way as the frequency measurement. The revolutions are calculated by the value of 60 times the frequency. The revolution range is always selected one of 6,000 to 600krpm automatically. The minimum input voltage ( wave amplitude ) is about 300mV and the measurement cycle is 1 time a second.
( 1 - 9 ) Capacitance ( C ) measurement The constant-current charges the measured capacitor, and the charging time, while the voltage of capacitance reaches to the reference voltage, is measured and converted to the capacitance value. If the measured capacitor has any electric charges, accurate measurement is not available. Therefore the measured capacitor must be discharged before measurement. The sense terminal is the OVX terminal. ( 1 - 10 ) Adapter ( ADP ) measurement The voltage between the ADP terminal and the SGND is supplied to the A/D converter directly. Both of ADP terminal ( + ) and SGND terminal ( - ) are High-impedance in DC400mV range. Therefore, it is also used as differential input.
( 2 ) Switch input Mode The lock or push type input switch is applied for function selection. The switch type is selected in both of auto and manual ranges by the RMS terminal setting. When the push type switch is selected, auto ranging is always selected. When the lock type switch is selected and the RMS terminal is GND ( L ) level, all ranges are selected by switches. But if the RMS terminal is VDD level ( H ), auto range, manual range selection and the range set are performed by a push type switch.
KMS Terminal H H L
RMS Terminal H L *
SWITCH Lock type Push type
RANGE Full Auto Manual Full Auto * : Don't Care
Both of lock and push type application have the chattering protective function which reject the chattering less than 20ms.
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 D A D A C C C C V V mA mA ) ) A A
FC 1 H L H L H L H L H L H L H
FC 2 H H L L H H L L H H L L H
FC 3 H H H H L L L L H H H H L
FC 4 H H H H H H H H L L L L L
Resistance ( ) Continuity ( D i ode ( D A C C
Capacitance ( C )
Frequency ( f ) rpm A D P
( 2 - 1 - 2 ) Range setting ( Lock type & Auto-Ranging : KMS = RMS = " H " ) The range shown in below table is controlled by a switch of the RC0 terminal which must go to "L" level ( GND ) when it is pressed. When the switch is pressed once, the range is changed from Auto-range to manual-range, and its range is held. Then, the range is changed in every time by the switch operation. The range always returns to Auto-range from any kinds of range when the switch is pressed over than 1 second.
1push(>1sec)
Measurement Mode
Auto
1push(<1sec)
Manual
Range up
Ranging control
Default Range 4V 4V 40mA 40mA 400 400 4V
1push(<1sec)
D A D A
C C
V V
R2 to R5 R2 to R5 R2 to R3 R2 to R3 R1 to R6
(R5R2) (R5R2) H O L D Ri Ri+1 (R3R2) (R3R2) (R6R1)
4V to 4000V 4V to 4000V 40mA to 400mA 40mA to 400mA 400 to 40M
C mA C mA ) ) P A A
Resistance ( ) Continuity ( D i ode ( A D A D C C
F IX E D
400mV 40A 40A
Frequency ( f ) Tacho ( r p m ) Capacitance ( C )
R1 to R5 R1 to R3 R1 to R6 H O L D
Auto-range RiRi+1 (R6R1)
100Hz to 999.9kHz 6000rpm to 600krpm 4nF to 400uF
100Hz 6000rpm 4nF
NJU9214
( Note ) Frequency measurement and revolution measurement are always set to the Auto-Range. Ranges of continuity test ( ), diode check ( ), ADP, DCA and ACA measurement are always fixed to the default ranges. Just after the power-on operation or mode changing, the range is set to the default range. In the ADP measurement, three units are displayed by setting of RC1 to RC3 terminals. The R1 to R6 of above range control table are set as a range corresponding to below table.
RANGE R1 R2 R3 R4 R5 R6 DCV 400mV *4V 40V 400V 4000V ACV 400mA *4V 40V 400V 4000V D C mA A C mA *40mA 400mA *40mA 400mA *400 4 k 4 0 k 4 0 0 k 4 0 0 0 k 40M f *100Hz 1000Hz 10kHz 100kHz 1000kHz rpm *6000 60000 600k C *4nF 40nF 400nF 4uF 40uF 400uF
(NOTE) The " * " mark means the default range. Changing to DC400mA range or AC400mA is available by only manual operation. Auto-range operation cannot change to these ranges.
( 2 - 1 - 3 ) Range setting ( Lock type switch & Manual-range : KMS = " H ", RMS = " L " ) The range setting shown in below table is available with RC1 to RC3 terminal.
RC 1 H L H L H L H L RC 2 H H L L H H L L RC 3 H H H H L L L L D C V, AC V 400mA 4V 40V 400V 4000V 400mV 400mV 400mV D C mA, AC mA 4mA 40mA 400mA 4000mA 4mA 4mA 4mA 4mA 400 4 k 4 0 k 4 0 0 k 4 0 0 0 k 40M 400 400 C 4nF 40nF 400nF 4uF 40uF 400uF 4nF 4nF
( NOTE ) Frequency and revolution measurements are always set to the Auto-range. Ranges of continuity test ( ), diode check ( ), ADP, DCA and ACA measurement are always fixed to the default ranges.
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;
C ontrol Termi nals KI1 FC 1 Selecti on Termi nals FC 2 FC 3 FC 4 D on't care D on't care D on't care rpm KI2 HOLD FRQ D C /AC V mA A KI3 MIN/MAX AD P KI4 MEN REL KI5 READ C AP RANGE
All switches excepting for the power switch should be used non-locked push type switch. The range is set to the full auto-range mode and selected by the "RANGE" key. When the power is turned on, the mode is set to the DCV. When the auto power-off is released, the mode returns to the previous mode of auto power-off. The functions of HOLD, MIN/MAX, MEM, READ and REL are same as KI1 to KI5 input using lock type switch which is explained in ( 4 ) Attached functions. If some of switches are pressed at the same time, the input order is as follows, Selection terminal : FC4FC3FC2FC1 Control terminal : KI5 KI4 KI3 KI2 KI1
< Example of the switch circuit >
NJU9214
KMS FC1 FC2 FC3 FC4 KI1 KI2 KI3 KI4 KI5 RANGE ADP REL MEM MIN/MAX CAP READ
rpm
VSSD
V DC/AC FRQ HOLD
mA
A
NJU9214
Range setting ( Push type switch : KMS = " L ", RMS = " X " ) The range setting shown in below table is available with the " RANGE " switch. When the switch is pressed once, the range is changed from auto to manual, and it's range is held. Then, the range is changed in everytime by the switch operation. When the switch is pressed over than 1 second, the range always returns to Auto-range is possible from any range statuses.
1push(>1sec)
Measurement Mode
Auto
1push(<1sec)
Manual
Range up
Rangi ng C ontrol
D efault Range 4V 4V 40mA 40mA 400 400 4V
1push(<1sec)
D D D D
C C C C
V V mA mA ) ) P A A
R1 to R5 R1 to R5 R2 to R3 R2 to R3 R1 to R6 HOLD
(R5R1) (R5R1) Ri Ri +1 (R3 R2) (R3R2) (R6R1)
400mV to 4000V 400mV to 4000V 40mA to 400mA 40mA to 400mA 400 to 40M
Resi stance ( ) C onti nui ty ( D i ode ( A D A D C C
F IX E D
400mV 40A 40A
Frequency ( f ) Tacho ( r p m ) C apaci tance ( C )
R1 to R5 R1 to R3 R1 to R6 HOLD Auto-range Ri Ri +1 (R6R1)
100Hz to 999.9kHz 6000rpm to 600krpm 4nF to 400uF
100Hz 6000rpm 4nF
( NOTE ) Frequency measurement and Tacho are always set to the auto-range. Ranges of continuity test ( ), diode check ( ), ADP, DCA and ACA measurements are always fixed to their default ranges. Just after power-on operation or changing mode, their ranges are set to the default range. In the ADP measurement, 3 units are displayed by setting of RC1 to RC3 terminals.
The R1 to R6 of above range control table are set a range corresponding to below table.
RANGE R1 R2 R3 R4 R5 R6 DCV 400mV *4V 40V 400V 4000V AC V 400mA *4V 40V 400V 4000V D C mA *40mA 400mA AC mA *40mA 400mA *400 4 k 4 0 k 4 0 0 k 4 0 0 0 k 40M f *100Hz 1000Hz 10kHz 100kHz 1000kHz rpm *6000 60000 600k C *4nF 40nF 400nF 4uF 40uF 400uF
( NOTE ) The " * " mark means the default range. Changing to DC400mV range or AC400mV range is available by only manual operation. Auto-range operation cannot change to these ranges. When the auto-range is switched in DC400mV or AC400mV range, measurement is continued in the 400mV range. When overflow occurs in 400mV of the auto-range, its range changes to 4V range automatically.
NJU9214
< Example of the Latching Relay Driver Circuit > RD1 to RD4 are normally " H ". ( Active " L " )
0.01
GND
COM 10A
SGND2 SGND1
0.99
AGND 33k 33k
SW1
, , ,CAP
IVSH IVSL ADP OVX OVH
9
100k PTC 500
100
SW5
OR2 OR1 VR5 VR4 VR3
1k 10k 100k
SW2
DCV, ACV , , , , CAP, DCmA, ACmA, FRQ, rpm, ADP
DCmA, ACmA
0.1uF
ACV,ACmA, FRQ,rpm
0.022uF
others
1M 10M 100k
SW7
others
SW3
DC400mV,ADP
VR2 VI ACOUT
VDDA
RMSIN
SW7 Rectifier circuit block
RD1 RD2 RD3 RD4
VSSA
SW Changing coil of latching relay VDDD
RMS-DC Converter Power source SW
1k X 14 SW1 RESET SET
VDDD
SW2
VSSD
SW4 is used into the rectifier circuit block shown in the Example of application
74HC138
16 15 14 13 12 11 10 9
74HC138
16 15 14 13 12 11 10 9
SW3
SW4
SW5
circuit.
SW8 VDDD SW7 VDDD
VSSD
NJU9214
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
NJU9214
About 10ms pulse width signal shown in below table is outputted from RD1 to RD4. This pulse controls the Latching Relay Driving.
FUNC TION RANGE , , , AP Relay SW1 SW2 SW3 S et SW4 SW5 SW6 SW7 SW1 SW2 SW3 Reset SW4 SW5 SW6 SW7 Reset S et RD 1 RD 2 RD 3 RD 4
D C mA, AC mA D C 400mV, AD P AC 400mV , AC A AC mA,AC A,AC V,FRQ,rpm , , , C AP
D C mA, AD P D C 400mA, AD P AC 400mV , AC A AC mA,AC A,AC V,FRQ,rpm
( 4 ) Attached functions ( Functions with KI1 to KI5 are available by only lock type switches. ) ( 4 - 1 ) Data Hold : HOLD The hold or release of all display data is performed alternately by KI1 terminal input. However, A/D conversion is operating even though in the HOLD status, therefore the buzzer sounds at the overrange and the continuity test. In the auto-range operation, changing of range is available. ( 4 - 2 ) Relative Measurement : FREL The relative measurement is selected when the switch connecting to KI2 terminal is pressed. In this mode, the value of difference between the present and the just before value is displayed. In case of the auto-range, the range is held at the just before range. However, the bargraph displays the absolute value, not the relative value. And the over-range also occurs from the absolute value of input. When the KI2 is pressed over than 1 second, the relative mode is released. ( 4 - 3 ) Min. / Max. Hold : MIN/MAX When the switch connecting to terminal KI3 is pressed, the mode is circulated as follows ; MIN Value Hold MAX Value Hold HOLD Release The bargraph always displays the input value. ( 4 - 4 ) Data Memory : MEN When the switch connecting to terminal KI4 is pressed, all of display data is stored into the memory. The stored data can be read out and displayed on LCD by pressing the READ key connecting to terminal KI5, and [MEM] mark blinks during this mode. This mode is released by pressing the READ key connecting to terminal KI5.
NJU9214
( 4 - 5 ) Buzzer output 2kHz buzzer sounds at following cases ; [ 1 ] Key operation ( except function changing and range changing ) [ 2 ] Auto-power off operation [ 3 ] Continuity test ( ) ; less than 40 [ 4 ] Releasing from relative mode and MIN / MAX display [ 5 ] Changed between manual-range and auto-range by RCO terminal [ 6 ] Auto-range: Overflowing at 4,000V range Manual-range: Overflowing at every range except 400mV range [ 7 ] Power-on operating and Releasing from the Auto-power off mode [ 8 ] Twice sounds from 24 seconds before and every 8 seconds ( 4 - 6 ) Low-Battery Detector : BLD If the supply voltage is less than 4.0 0.4V, [ BATT ] mark is blinked. ( 4 - 7 ) Auto power-off If the key-operation doesn't work over than 30 minutes, the power is turned off automatically after 1 second buzzer sound, and all display is disappeared. ( the data in the memory is kept ) When the PON terminal is pressed or power switch is turned off, this mode is released. In case of release by PON terminal, the previous value of the auto power-off operation is displayed for 2 seconds. 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
FUNCTIONS Range(Auto range) Range Hold Data Hold Relative Measure MIN / MAX Hold Data Memory Auto power-off All " 0 " display Auto off Hold Auto off Reset Reset Reset Hold Auto off Power-on Default range Function changing Default range Range changing Hold
( 4 - 9 ) Display of ADP setting In measurement operation by the ADP function, the following display setting by RC1 to RC3 terminals is available.
NJU9214
RC1 H L H L H L H L RC2 H H L L H H L L RC3 H H H H L L L L Mark Display Decimal Point Non AD P1 AD P2 * * * * * Non P1 P1 * * * * * Application Example hfe Measurement C ( Temp. Measurement ) F ( Temp. Measurement ) * * * * *
* : ( Don't Care ) ( 5 ) Serial Data output The NJU9214 has terminals (TXD,DTR,DSR) for serial data output with RS-232C format requiring a external RS232C 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. It selects the transmission rate by the TXS terminal, "L" level : 9,600bps, "H" level : 2,400bps. The logic levels from all of output terminals are " L " 0.8V, " H " 4.2V.
( 5 - 1 ) The structure of the serial data An unit of serial data consists of 10bits. The first bit of data is Start bit, the 2nd to the 9th bits are Data bits, the 10th is Stop bits, therefore 11bits data structures a character as an unit. The data is transmitted from the LSB in sequence. Regarding the data order, please refer to [ ( 5 - 3 ) RS-232C Data Format ]. The data is outputted with the ASCII code.
( 5 - 2 ) Example of transmission waveform Example of transmission waveform on the TXD terminal is shown below.
8 bit data
START BIT STOP BIT START
8 bit data
STOP BIT
D0 D1 D2 D3 D4 D5 D6 D7
D0 D1 D2 D3 D4 D5 D6 D7
01001110010101110001
DATA 39(HEX) DATA 1D(HEX) 1 Character 1 Character
BIT
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
D C V .,A = + 100.01 m ,
[CR]
BLD Unit Data Sign Measurement Mode FUNCTION
( 5 - 3 - 1 ) Function
FUNC TION DCV AC V DCA AC A RESISTANC E C onti nui ty D i ode C apaci tance Frequency Tacho AD P
C HARAC TER
D A D A O C D C F r A
C C C C H H I A R p D
V V A A M K O P Q m P
( 5 - 3 - 2 ) Measurement Mode
Measurement Mode Absolute Value Relati ve Value
C haracter
A R
( 5 - 3 - 3 ) Sign This sign shows the polarity of data.
S i gn Positive Number Negative Number
Character + (PLUS) - (MINUS)
( 5 - 3 - 4 ) DATA The data consists of six figures including a decimal point.
NJU9214
( 5 - 3 - 5 ) Unit This unit name shows the following characters.
Uni t Name MegaKi loMi lli Mi croNanoC haracter
M K
(Space)
m n
( 5 - 3 -6 ) Buttery Life Detector It shows the condition of buttery.
C ondi ti on Normal Low-Buttery warni ng C haracter (Space)
B
( 5 - 3 - 7 ) Examples of various data [ Ex.1 ] In DCV400mV range, when following voltage is measured. Measured value 100.01mV Format Pattern DCV, A=+100.01m, [CR]
The actual data from RS-232C line is shown below. ASCII CODE D C V , HEX CODE &H44 &H43 &H52 &H2C *** RS-232C DATA 00010001011 01100001011 00100101011 00011010011 0 1 m , [CR] &H30 &H31 &H6D &H2C &H20 &H0D 00000110011 0100011011 01011011011 00011010011 00000010011 01011000011
***
[ Ex.2 ] On the condition of Ex.1, when relative mode is used. To calculate the relative value, the reference voltage must be required. The reference voltage is the measured voltage of relative mode. Example of the reference voltage = 100.00mV. measured value 100.01mV relative value 100.01mV - 100.00mV = 0.01mV Format pattern DCV, R=+000.01m, [CR]
NJU9214
[ Ex.3 ] In DCV400mV range, when overflow is occurred on the positive voltage side by 401mV input. Measured value Format pattern DCV, A=+.m, [CR] "." shows overflow, "+" shows overflow on the positive side. overflow on the "+" side
[ Ex.4 ] In DCV400mV range, when overflow is occurred on the negative voltage side by -401mV input. Measured value Format pattern DCV, A=-.m, [CR] "." shows overflow, "-" shows overflow on the negative side. [ Ex.5 ] In DCV400mV range, when the battery life detector warns under the condition of Ex.1. Measured value 100.01mV Format pattern DCV, A=+100.01m, B[CR] Battery life detector [ Ex.6 ] In ACA400mA range, when the following current is measured. Measured value 40.00mA Format pattern ACA, A=+040.00m, [CR] overflow on the "-" side
[ Ex.7 ] In resistance 400k range, when the following resistance is measured. Measured value 100.10k Format pattern OHM, A=+100.10k, [CR]
[ Ex.8 ] In frequency 10kHz range, when the following frequency is measured. Measured value 5.35kHz Format pattern FRQ, A=+005.35k, [CR]
[ Ex.9 ] In tachometer 6000rpm range, the following revolution is measured. Measured value 2500rpm Format pattern rpm, A=+02500 , [CR]
NJU9214
( 6 ) 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 2V. ( 7 ) Example of Display Layout ( 7 - 1 ) Connection of Common Line BATT REL AC
COM4
HOLD
MAX
MIN
MEN
APF CF mVA nFrpm MKHz RS232C
DC
COM3 COM2 COM1
AUTO
0
10
20
30
40
( 7 - 2 ) Connection of Segment Line
SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 SEG16 SEG17 SEG18 SEG19 SEG20 SEG21 SEG22 SEG23 SEG24 SEG25 SEG26 SEG27 SEG28
BATT AC DC AUTO 0 ( 7 - 3 ) Segment Assignment
SEG1 C OM1 C OM2 C OM3 C OM4 C OM1 C OM2 C OM3 C OM4 C OM1 C OM2 C OM3 C OM4 BPN BP0 BPDC B P 18 B P 17 P3 HOLD B P 35 d0 g0 a0 SEG2 BP2 BP1 BATT B P 20 B P 19 e2 f2 B P 37 B P 36 c0 b0 SEG3 BP4 BP3 AUTO AC B P 21 d2 g2 a2 B P 39 B P 38 MEM SEG4 BP6 BP5 e4 f4 B P 23 B P 22 c2 b2 B P 40 n m APF SEG5 BP7 d4 g4 a4 B P 25 B P 24 P2 MAX M F V SEG6 BP9 BP8 c4 b4 B P 27 B P 26 e1 f1 k rpm F C SEG7 PB11 B P 10 P4 REL B P 28 d1 g1 a1 Hz A SEG8 P B 13 B P 12 e3 f3 SEG18 B P 30 B P 29 c1 b1 SEG28 RS232C / / / SEG9 B P 14 d3 g3 a3 B P 32 B P 31 P1 MIN / / / / / SEG10 B P 16 B P 15 c3 b3 B P 34 B P 33 e0 f0 / / / / /
REL
HOLD
MAX
MIN
MEN
APF C
F
m V A n F rpm M k Hz RS232C
10
20
30
40
SEG11 SEG12 SEG13 SEG14 SEG15 SEG16 SEG17
SEG19 SEG20
SEG21 SEG22 SEG23 SEG24 SEG25 SEG26 SEG27
NJU9214
a4
b4 f4 g4 c4 f3
a3
b3 g3 c3 f2
a2
b2 g2 c2 f1
a1
b1 g1 c1 e0 f0
a0
b0 g0 c0
e4
e3
e2
e1
BPBP0
d4
p4
d3
p3
d2
p2
d1
p1
d0
BP40
0
BPN
10
BPN
20
BPN
30
BPN
40
BPN
( 7 - 4 ) Explanation of Display Mark : 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 ( ), and capacitance ( C ) and continuity ( ) measurement mode. 5. AUTO : Displayed in the auto range measurement mode. 6. REL : Displayed in the relative display measurement mode. 7. HOLD : Data Hold. Displayed in Memory READ with READ key. 8. MAX : Displayed in maximum display mode. 9. MIN : Displayed in minimum display mode. 10. MEM : Displayed during memorizing data. Blinked during recalling the data. 11. : Displayed in continuity test measurement mode. 12. : Displayed in diode check measurement mode. 13. mV : Displayed in DCmV and ACmV ranges. 14. mA : Displayed in DCmA and ACmA ranges. 15. C : In ADP measurement mode, displayed with ADP1 mark. 16. F : In ADP measurement mode, displayed with ADP2 mark. 17. nF : Displayed in capacitance measurement mode. ( 4nF, 40nF, 400nF ranges ) 18. F : Displayed in capacitance measurement mode.( 4F, 40F, 400F ranges ) 19. : Displayed in resistance measurement mode.( 400 range ) 20. k : Displayed in resistance measurement mode.( k range ) 21. M : Displayed in resistance measurement mode.( M range ) 22. Hz : Displayed in frequency measurement mode.( Hz range ) 23. kHz : Displayed in frequency measurement mode.( kHz range ) 24. rpm : Displayed in tachometer measurement mode. 25. RS-232C : Displayed in available mode of RS-232C Blinking under RS-232C operation. 26. APF : Displayed under Auto Power Off operation. After 30 minutes from the last key input, the power is turned off automatically. 1. 2. 3. 4. BATT DC AC -
NJU9214
( 7 - 5 ) Bargraph display The bargraph displays 10 times speed comparing with numeric display. However it is not displayed in frequency, revolution and capacitance measurement mode. 1. BP: Displayed when negative signal is input. 2. BP0 : Displayed when the digital display is more than about "00400". 3. BP1 to 40 : BP1 is displayed when the digital display is more than about "01000", then 1 segment display increases at every 1,000 counts. If overflow occurs, all of BP0 to BP40 are displayed. 4. The figures of " 0, 10, 20, 30, 40 "under the bargraph is displayed expecting for frequency, tacho and capacitance measurement mode. ( 7 - 6 ) Over-range Display When the over-range is occurred, the display becomes " 40000 " and all digit blinks. However " 0000 " is displayed in frequency measurement mode, " 60000 " is displayed in revolution measurement mode, " 4000 " is displayed in capacitance measurement mode, and also every digit blinks in these modes. In relative measurement mode, but it is not concerned with the display value. All of digits blink when over-range occurs by the absolute input value.
( 7 - 7 ) Polarity Display In cases of the " 0 " display value, AC voltage, AC current, resistance ( ), diode ( ), capacitance ( C ), frequency ( f ), tacho ( rpm ) and continuity test ( ) measurement mode, " - " mark is not displayed. However in relative measurement mode, any measurement modes display " - " .
NJU9214
!ABSOLUTE MAXIMUM RATINGS
PARAMETER Supply Voltage Range Control Terminal Voltage Analog Terminal Voltage Terminals Current Supply Teminal OVH Terminal Others SYMBOL VD D A - VSSA VD D D - VSSD Vi d Vi a IDD, IGND, ISS IOVH II Topr Tstg RATINGS 11 5.5 VDDD to VSSD VDDA to VSSA 50 50 10 0 to +50 -40 to +125 C C mA
( Ta=25C )
UNIT V V V V
Operating Temperature Storage Temperature Range
VDDD and VDDA must be same voltage level.
!ELECTRICAL CHARACTERISTICS
( 1 )DC Characteristics
PARAMETER Operating Voltage Operating Current Negative Supply Voltage Low-Battery Detection Voltage Linearity Polarity Error Digital Display Bargraph Digital Display Bargraph Digital Display Sampling Time Capacitance M. Bargraph Digital Display Sampling Rate Capacitance M. Bargraph High Level Input Voltage Low Level Input Voltage
( VDD = + 5.0V, VSSA= - 5.0V, AGND = DGND = 0V, DC400mV range, Ta=25C)
SYMBOL VD D IDD IPOF VSS V B LD Linn Ling E pn E pg Zero tsn tsnc tsg Nrn Nrnc Nrg VIH VIL TXS, TRX, FC1 to 4, RC0 to 3, KI1 to 5, T1 to 3, PON, KMS, RMS, RST Terminal TXS, TRX, FC1 to 4, RC0 to 3, KI1 to 5, T1 to 3, PON Terminal RST Terminal Input Series Resistor = 100k VDD Terminal VDD Terminal,in auto Power off VDD Terminal VBLD terminal CONDITIONS MIN 4.75 3.6 0 4.2 100 TYP 5.0 4.0 0 100 500 5 2 1 20 300 10 MAX 5.25 1.5 0.01 -5.25 4.4 5 5 0 0.8 500 V V cyc./s ms UNIT V mA mA V V %FS %FS COUNT 2 NOTE 1
-4.75 -5.0
0.07+2 %FSCOUNT 0.07+2 %FSCOUNT
Zero Reading Display
Input Pull-Up Resistance
RI
k
NOTE 1 : VDD is the general term for VDDA and VDDD. NOTE 2 : In this case, all of key input levels are High. In case of "LOW" level input into the key, 16uA current flow from a pin through an internal pull up resistance ( 300kTYP. ) in TXS, TRX, KMS, RMS, RC 0 to 3, FC1 to 4, KI1 to 5, PON, T 1 to 3 terminals and 500uA current flow from RST terminal though a pull up resistance ( 10k TYP. ).
NJU9214
DC Characteristic (A/D conversion) ( VDD = +5.0V, VSSA = -5.0V, AGND = DGND = 0V, DC 400mV range, Ta = 25C)
PARAMETER Buzzer Driving Current Digital Output Current Select Terminal Output Current Open volltage in Resistance Measurement Charging Voltage in Capacitance Measurement Input Leakage Current LCD Driving Voltage (VDSP is floating.) LCD Driving Voltage (VDSP and VSSD are shorted.) SYMBOL IOH1 IOL1 IOH2 IOL2 IOH3 IOL3 VOHM VC AP ILO ILF VH VL VH VL SEG1 to 28, COM1 to 4 Terminal ( vs VDDD Voltage ) CONDITIONS BZ Terminal DTR, TXD Terminal RD1 to 4 Terminal FC1 to 4 Terminal (Push Switch Mode) used for , VOH = 4.7V VOL = 0.3V VOH = 4.6V VOH = 0.4V VOH = 4.6V VOH = 0.4V MIN 0.25 -0.25 0.5 -0.5 0.5 -0.5 -0.9 -1.8 -1.4 -3.1 TYP 0.75 -0.75 1.0 -1.0 1.0 -1.0 0.4 5 -1.0 -2.0 -1.6 -3.3 MAX V used for " C " measurement VI Terminal VIN=0mV VIN=400mV 10 40 -1.2 -2.2 -1.8 -3.5 V 4 pA 3 mA UNIT NOTE
measurement
NOTE 3 : The current source outputs VDD = 5V as an open voltage, however in normal operation, about 1V as the threshold of comparator is maximum voltage.
NJU9214 about 1V
Measured capacitor OVX
OVH
SW1
0V
SW1
SW2
about 1V
SW2
NJU9214
NOTE4 : LCD Diving Voltage ( Example of output waveform ) Waveform of 1/4 Duty, DC400mV range, VIN = 0mV
VDD
COM1
VDSP VDD
COM2
VDSP VDD
COM3
VDSP VDD
COM4
VDSP VDD
SEG1
VDSP VDD
SEG2
VDSP VDD
SEG3
VDSP VDD
SEG4
VDSP
1 cycle
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. ( 2 ) Switching characteristic ( VDDA = VDDD = +5.0V, VSSA = -5.0V, AGND = DGND = 0V, DC4V range, fXT=4MHz, 25C)
PARAMETER Buzzer Output Frequency D ata transmi ssi on rate LC D dri ver frequency Relay dri ver pulse wi dth SYMBOL FB Z tOUT F LC D twrd C OND ITIONS BZ T rmi nal e TXD termi nal SEG1 to 28, C OM1 to 4 termi nal RD 1 to 4 termi nal (TXS:H) (TXS:L) MIN TYP 2.0 2400 9600 50 10 MAX UNIT kHz bps Hz ms
NJU9214
!Examples of application circuit.
( 1 ) Circuit using lock type switch. ( Current Auto * Manual-2 range mode, RMS = " H " )
DCV, ACV, , , , CAP,
FUSE
ADP
10A COM
When /
/
/ cap, SW1 is ON.
Reference Voltage element:over 2.5V Temperature coefficient:below 20ppm/ C
FUSE
DCmA, ACmA, FRQ, rpm
When AcmA/DcmA,SW2 is ON.
BATTERY AGND 100uF 100uF 100uF VDDA +5V 10K
0.1u
SW2
180k
180k 40k 30k
AC measurement: AC coupling side
SW1
9
0.99
0.01
40k
30k
Others:VR2 side
100K 2
0.33u 1
0.01u 1
SW3
10M 2 2 1M 100K 2 10K 2 1K 2 100 2
0.1uF
VSSA -5V VDDD +5V
0.01u 1
0.01u 1
0.1u 1
33k 100k 33k 33k
VI VR2 VR3 VR4 VR5 VR6 VR7 OVH OVX ADP IVSL IVSH AGND SGND1 SGND2 INT1 INT2 CL1 CH1 VREF1 VREF2 VREF3 CH2 CL2 BUF
Rectification circuit block
ACOUT
510
100uF
Regulator
VSSD VSSD 100K 100K
DC400mV:VI side
SW7 0.022uF
SW5
VDDA VDDA
1 100
95
90
85
80
75
50k 180k
CIF1 CIF2 BLD VSSA SLEEP VSSD VDSP XT1 XT2 BZ TXD DTR DSR SEG28 SEG27 SEG26 SEG25 SEG24 SEG23 SEG22 SEG21 SEG20 SEG19 SEG18 SEG17
100
50k
VSSD
RMSIN VDDD VDDD RD1 RD2 RD3 RD4 TXS TRX KMS VDDD RMS RC0 RC1 RC2 RC3 FC1 FC2 FC3 FC4 KI1 KI2 KI3 KI4 KI5
5 70
4MHz
10p 10p
BZ
10 65
15
NJU9214
60
RS232C Driver
20 55
25
30
35
40
45
50 : Lock type switch : Push type switch
PON RST T1 T2 T3 COM1 COM2 COM3 COM4 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 SEG16
VSSD
BATT AC DC AUTO
0
REL
HOLD
MAX
MIN
MEM
APF
C mVA
F
nFrpm M k Hz
10 20 30 40
RS232C
1 Low-leak capacitors like as the polypropylene film type are required for accurate measurement. 2 Within 0.01% tolerance resisters or the adjustment by the trimmer potentiometer are recommended.
NJU9214
( 2 ) Circuit using lock type switch ( Current Manual-4 range mode, RMS = " L " )
DCV, ACV, , , , CAP,
10A COM
When /
/
/ CAP, SW1 is ON.
Reference Voltage element:over 2.5V Temperature coefficient:below 20ppm/ C
FUSE
4mA 40mA 400mA 4000mA
99 9 0.9 0.1
DCmA, ACmA, FRQ, rpm
ADP
FUSE
When AcmA/DcmA,SW2 is ON.
180k
180k
50k
50k 180k
40k
100
40k
AGND
AC measurement:AC coupling side
SW1
0.01
0.1u
DC400mV:VI side Others:VR2 side
30k
30k
0.1uF
100K 2
0.33u 1
0.01u 1
SW3
10M 2 1M 2 100K 2 10K 2 1K 2 100 2
VSSA -5V VDDD +5V
0.01u 1
510 0.01u 1
VI VR2 VR3 VR4 VR5 VR6 VR7 OVH OVX ADP IVSL IVSH AGND SGND1 SGND2 INT1 INT2 CL1 CH1 VREF1 VREF2 VREF3 CH2 CL2 BUF
100uF
Rectification circuit block ACOUT
VDDA VDDA
0.1u 1
33k 100k 33k 33k
Regulator
VSSD VSSD
SW7 0.022uF
SW5
100uF
100uF
1 100
95
90
85
80
75
RMSIN
VDDD VDDD
VDDD
RD1 RD2 RD3 RD4 TXS TRX KMS RMS RC0 RC1 RC2 RC3 FC1 FC2 FC3 FC4 KI1 KI2 KI3 KI4 KI5
70
4MHz
10p 10p
BZ
10 65
NJU9214
15 60
RS232C Driver
20 55
25
30
35
40
45
50
: Lock type switch PON RST T1 T2 T3 COM1 COM2 COM3 COM4 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 SEG16 : Push type switch
VSSD
BATT AC DC AUTO
0
REL
HOLD
MAX
MIN
MEM
APF
CF mVA nFrpm MkHz
10 20 30 40
RS232C
1 Low-leak capacitors like as the polypropylene film type are required for accurate measurement. 2 Within 0.01% tolerance resistors or the adjustment by the trimmer potentiometer are recommended.
100K
5
CIF1 CIF2 BLD VSSA SLEEP VSSD VDSP XT1 XT2 BZ TXD DTR DSR SEG28 SEG27 SEG26 SEG25 SEG24 SEG23 SEG22 SEG21 SEG20 SEG19 SEG18 SEG17
VSSD
100K
100uF
VDDA +5V 10K
BATTERY
NJU9214
( 3 ) Circuit using push type switch ( Current Auto * Manual-2range mode, KMS = " L " )
DCV, ACV, , , , CAP,
FUSE
ADP
10A
COM
When /
Reference Voltage element:over 2.5V
/ / cap, SW1 is ON.
Temperature coefficient:below 20ppm/ C
FUSE
DCmA, ACmA, FRQ, rpm
When ACmA/DCmA,SW2 is ON.
SW2
AGND 100uF 100uF
180k
180k
50k
SW1 SW7 100
9
0.99
0.01
DC400mV:VI side Others:VR2 side 0.022uF
0.1uF
100K 2
0.33u 1
0.01u 1
SW3
10M 2 1M 2 100K 2 10K 2 1K 2 100 2
VSSA -5V VDDD +5V
0.01u 1
510 0.01u 1
VI VR2 VR3 VR4 VR5 VR6 VR7 OVH OVX ADP IVSL IVSH AGND SGND1 SGND2 INT1 INT2 CL1 CH1 VREF1 VREF2 VREF3 CH2 CL2 BUF
100uF
Rectification circuit block
0.1u 1
33k 100k 33k 33k
Regulator
VSS VSSD 100K 100K
30k
30k
SW5
ACOUT
VDDA VDDA
1 100
95
90
85
80
75
50k 180k
40k
40k
RMSIN VDDD VDDD RD1 RD2 RD3 RD4 TXS TRX KMS RMS RC0 RC1 RC2 RC3 FC1 FC2 FC3 FC4 KI1 KI2 KI3 KI4 KI5
5 70
10 65
NJU9214
15 60
20 55
25
30
35
40
45
50
CIF1 CIF2 BLD VSSA SLEEP VSSD VDSP XT1 XT2 BZ TXD DTR DSR SEG28 SEG27 SEG26 SEG25 SEG24 SEG23 SEG22 SEG21 SEG20 SEG19 SEG18 SEG17
0.1u
AC measurement:AC coupling side
VSSD
4MHz
10p 10p
BZ
RS232C Driver
: Lock type switch PON RST T1 T2 T3 COM1 COM2 COM3 COM4 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 SEG16 : Push type switch
VSSD
BATT AC DC AUTO
0
REL
HOLD
MAX
MIN
MEM
APF
CF mVA nFrpm MkHz RS232C
10 20 30 40
1 Low-leak capacitors like as the polypropylene film type are required for accurate measurement. 2 Within 0.01% tolerance resistors or the adjustment by the trimmer potentiometer are recommended.
100uF
VDDA +5V 10K
BATTERY
NJU9214
( 4 ) Application circuit of AC voltage and AC current measurement In case of AC voltage and AC current measurement, AC-DC conversion is required in the external circuit. In use of the mean square circuit, the measurement circuit realizes low cost system. And also in use of RMS/DC converter, it realizes a root-mean-square measurement. The circuit example using AD736 ( Analog Devices,Inc. ) is shown below for a root-mean-square measurement. ( The circuit is for only reference, so please refer to the data book of Analog Devices, Inc. for details. )
10M
NJU9214 VR2(PIN99) ACOUT(PIN1) RMSIN(PIN3)
0.022uF
SW4_1 1N4148 47K
VDDA
AC4V to 4000V range
SW4_2
10uF
1N4148 1 AC400mV VSSA 2 3
RMS
AD736
Full-wave rectifier
8 7 6
AGND VDDA
AC400mV
4
Converter block
5
+
33uF VSSA
Rectifier circuit block
10uF
( 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. 4.Designing of circuit pattern requires low wiring resistance between AGND terminal and SGND terminal. 5.Constants of resistances for voltage dividing and decoupling capacitor are not guaranteed value as to characteristic. Re adjustment is sometime required depending on elements and peripheral circuit. 6.RMS/DC converter requires full-scale and zero adjustment.
NJU9214 MEMO
[CAUTION] The specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights.

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