NJRC NJU9214

NJU9214
PRELIMINARY
4•3/4 DIGIT SINGLE CHIP DIGITAL MULTIMETER LSI
! GENERAL DESCRIPTION
PACKAGE OUTLINE
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.
! 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
NJU9214FG1
NJU9214
!BLOCK DIAGRAM
REGURATOR
COM
IVSL,
IVSL, IVSH
VI,,
VI
VR2 to 7,
OVH,
OVH,
OVX
ADP
RMS-DC
CONVERTER
VREF3
BATT
REFERENCE
SGND
RD1 to 4
VDDD VSSD
0V
5.0V
VREF2
VDDA AGND VSSA
+5.0V 0V -5.0V
SWITCH
NETWORK
EXTERNAL
DCV,
DCV, ACV,
ACV,
Ω,
,
,CAP
,CAP,
CAP,
DCmA,
DCmA, ACmA,
ACmA,
FRQ,
FRQ, rpm
RESISTORS and SWITCHS
A
VREF1
REFERENCE
LOW
BUFFER
DETECTOR
FRQ
HIGH
SPEED
A/D SECTION
HIGH
RESOLUTION
A/D SECTION
ANALOG
SECTION
BUFFER
CAPACITOR
A/D SECTION
RMSIN
SWITCH
HIGH SPEED
NETWORK I/F
A/D I/F
RELAY
SWITCH
HIGH SPEED
CONT-
NETWORK
A/D CONTROLER
ROLER
CONTROLER
HIGH RESOLUTION A/D I/F
HIGH RESOLUTION
A/D CONTROLER
DIGITAL
SECTION
POWER ON
INITIALIZE
4bitBUS
TRX
TXS
RST
PON
KEY MATRIX
KEY
CONTROLE
RS232C
BUZZER
CONTROLER
CONTROLER
4bit CPU
LCD
CONTROLER
LCD DRIVER and
TXD
DTR
DSR
FC1 to 4,
KI1 to 5
RS232C
DRIVER
BZ
BUZZER
COM1 to 4
SEG1 to 28
LCD
TEST
OSC
POWER
T1 to T3
XT1
XT2
NJU9214
75
BUF
CL2
CH2
VREF3
VREF2
VREF1
70
65
60
SEG18
SEG17
SEG19
SEG20
SEG21
SEG23
SEG22
SEG26
SEG25
SEG24
SEG28
SEG27
DTR
DSR
TXD
XT2
BZ
XT1
VDSP
VSSD
VSSA
SLEEP
BLD
CIF1
CIF2
! PIN CONFIGURATION
55
50
SEG14
SEG13
80
45
SEG12
SEG11
SEG10
SEG9
SEG8
CH1
CL1
INT1
85
INT2
SGND2
SGND1
AGND
40
NJU9214FG1
90
35
95
30
SEG7
SEG6
SEG5
SEG4
SEG3
SEG2
SEG1
COM4
COM3
CMO2
COM1
T3
T2
T1
RST
PON
KI5
25
KI2
KI3
KI4
FC4
KI1
FC3
20
RC3
FC1
FC2
RC2
RC0
RC1
RMS
15
KMS
TXS
RD3
RD4
10
RD1
RD2
VDDD
RMSIN
VDDA
5
TRX
100
1
ACOUT
IVSH
IVSL
ADP
OVX
OVH
VR7
VR6
VR5
VR4
VR3
VR2
V1
SEG16
SEG15
! TERMINAL DESCRIPTION
No.
SYMBOL
I/O
FUNC TION
1
AC OUT
Out
2
VD D A
-
Analog VD D (VD D A = 5.0 ± 0.25V)
3
RMSIN
In
RMS-Voltage Input Termi nal
4
VD D D
-
D i gi tal VD D (VD D D = 5.0 ± 0.25V)
5 to 8
RD 1 to RD 4
Out
9
TXS
In
RS232C Output-Rate Select Termi nal L ; 9600bps H ; 2400bps
10
TRX
In
RS232C Functi on Select Termi nal
11
KMS
In
Key Mode Select Termi nal
12
RMS
In
Range C ontrol Mode Select Termi nal
13 to 20
RC 0 to RC 3
In
Range Select Termi nal wi th Input Pull-up Resi stance (300kΩ)
17 to 20
FC 1 to FC 4
I/O
Functi on Select Termi nal wi th Input Pull-up Resi stance (300kΩ)
21 to 25
KI1 to KI5
In
Opti onal Functi on C ontrol Termi nal wi th Input Pull-up Resi stance (300kΩ)
Attenuator output termi nal (used at AC A, AC mA, FRQ, rpm)
Relay D ri vi ng Termi nal
NJU9214
No.
SYMBOL
I/O
F UNC TION
26
PON
In
Auto Power-off Mode Release Terminal with Input Pull-up Resistance (300Ωk)
27
RST
In
System Reset Terminal with Input Pull-up Resistance(10kΩ)
28 to 30
T1 to T3
In
Test Terminal with Input Pull-up Resistance (300kΩ)
31 to 34 COM1 to COM4
Out
LCD Common Terminal
35 to 62 SEG1 to SEG28
Out
LCD Segment Terminal
63
D SR
In
RS232C Data Set Ready Terminal
64
DTR
Out
RS232C Data-Terminal Terminal
65
TXD
Out
RS232C Data Output Terminal
66
BZ
Out
Piezo Buzzer Driving Terminal
67
XT2
Out
Crystal oscillation Inverter (Output)
68
XT1
In
Crystal oscillation Inverter (Input)
69
VD SP
I/0
LCD driving voltage I/O Terminal
Opened : VDSP=(VDDD-VSSD) X 3/5
Connected to VSSD : VDSP=(VDDD-VSSD)
70
VSSD
-
71
S LE E P
Out
72
VSSA
-
Analog VSS VSSA=-5.0V
73
B LD
In
Buttery Life Detector Terminal, Detection: BLD<4.0V
74,75
CIF2, CIF1
I/0
High-speed integration capacitor connecting Terminal
76
BUF
Out
High-speed integrator buffer output Terminal
77,78
CL2, CH2
I/0
High-speed integrator reference capacitor connecting Terminal
79 to 81
VREF3
to
VREF1
In
VREF1:High-accurate integrator reference voltage input Terminal
VREF2:High-speed integrator reference voltage input Terminal
VREF3:Capacitance measurement integrator reference voltage
input Terminal
82,83
CH1, CL1
I/0
High-accurate integrator Reference capacitor connecting Terminal
CL1;"-",CH1;"+"
84,85
INT1, INT2
I/0
High-accurate integrator capacitor connecting Terminal
86,87
SGND2, SGND1
In
Analog sensing Terminal
88
AGND
-
Analog GND Terminal
89
IVSH
In
Current measurement (A) sensing Terminal
90
IVSL
In
Current measurement (mA) sensing Terminal
91
AD P
In
Adapter input Terminal
92
OVX
In
Sensing Terminal (Resistance,Continuity,Capacitance)
93
OVH
Out
Voltage supply Termina l(Resistance,Continuity,Diode,Capacitance)
94
VR7
I/0
Bleeder Resistance Terminal for 4V,40V range
95
VR6
I/0
Bleeder Resistance Terminal for 400Ω renge
96
VR5
I/0
Bleeder Resistance Terminal for 4000V,4kΩ renge
97
VR4
I/0
Bleeder Resistance Terminal for 400V,40kΩ renge
98
VR3
I/0
Bleeder Resistance Terminal for 40V,400kΩ renge
99
VR2
I/0
Bleeder Resistance Terminal for 4V,4000kΩ renge
100
VI
In
Voltage input Terminal for 400mV range
Digital VSS
VSSD=0V
Auto Power-off signal Terminal (Power-off:"H" Level)
NJU9214
! FUNCTION DESCRIPTION
( 1 )Measurement function
Each measurement functions shown below is available with the NJU9214.
MEASUREMENT
FUNCTION
RANGE
Auto/Manual
DC/AC Voltage
400mV to 4000V
Auto:4-range/Manual:5-range
*1
DC/AC Current
4mA to 4000mA
Auto·Manual-2range/Manual-4range
*2
DC/AC Current
40A
Fixed
Resistance (Ω)
400Ω to 40MΩ
Auto:6-range/Manual:6-range
Frequency (f)
100Hz to 1000kHz
Auto:5-range
Capacitance (C)
4nF to 400µF
Auto:6-range/Manual:6-range
Tacho (rpm)
6000rpm to 600Krpm
Auto:3-range
D i ode( )
Continuity(
Fixed
)
Fixed
AD P
Fixed
*3
*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 ºC, 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.
10MΩ resistor for input terminal may be easy to be affected by noises.
Therefore 10MΩ 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
(10MΩ, 10kΩ, 1kΩ) for 400V, 4000V ranges should be selected carefully. For example, when 4,000V is input,
0.4mA (4,000V÷10MΩ) flow through 10MΩ, and the resistor consumes power of 1.6W (4,000V×0.4mA) 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
DIVISION RATE
R1(400mV)
1
R2(4V)
1MΩ/10MΩ
R3(40V)
100kΩ /10MΩ
R4(400V)
10KΩ /10MΩ
R5(4000V)
1kΩ/10MΩ
NJU9214
( 1 - 2 ) Resistance measurement(Ω)
As shown below, six type resistors ( 10MΩ,1MΩ,100kΩ,10kΩ,1kΩ,100Ω ) 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 (400Ω) 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
Ω resistance.
In the R6 (40MΩ) 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
( 1 - 3 ) Continuity test(
Refer.Resistance Value
R1(400Ω)
100Ω
R2(4KΩ)
1 kΩ
R3(40KΩ)
1 0 kΩ
R4(400KΩ)
1 0 0 kΩ
R5(4000KΩ)
1MΩ
R6(40KΩ)
10MΩ
)
The input attenuator is fixed to 400Ω range of the resistance measurement mode. When the value is less than
40Ω, the buzzer sounds. The output voltage on the measurement terminal is about 0.4V.
If the display doesn't show 0Ω by resistances of lead wire when the terminals are shorted,
this case requires adjustment at 0Ω 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
RMS Terminal
H
H
H
L
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
FC 1
FC 2
FC 3
FC 4
D
C
V
H
H
H
H
A
C
V
L
H
H
H
D
C
mA
H
L
H
H
A
C
mA
L
L
H
H
Resistance ( Ω )
H
H
L
H
Continuity (
L
H
L
H
H
L
L
H
Capacitance ( C )
L
L
L
H
D
C
A
H
H
H
L
A
C
A
L
H
H
L
Frequency ( f )
H
L
H
L
rpm
L
L
H
L
H
H
L
L
D i ode (
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
Manual
1push(<1sec)
Range up
Ranging control
Default
Range
1push(<1sec)
D
C
V
R2 to R5
(R5→R2)
4V to 4000V
4V
A
C
V
R2 to R5
(R5→R2)
4V to 4000V
4V
D
C mA
R2 to R3
40mA to 400mA
40mA
A
C mA
R2 to R3
(R3→R2)
40mA to 400mA
40mA
R1 to R6
(R6→R1)
400Ω to 40MΩ
400Ω
Resistance ( Ω )
Continuity (
→ H O L D Ri→ Ri+1 (R3→R2)
400Ω
)
D i ode (
)
4V
A
D
P
D
C
A
40A
A
C
A
40A
Frequency ( f )
R1 to R5
Tacho ( r p m )
R1 to R3
Capacitance ( C )
400mV
F IX E D
R1 to R6
Auto-range
→H O L D
Ri→Ri+1 (R6→R1)
100Hz to 999.9kHz
100Hz
6000rpm to 600krpm
6000rpm
4nF to 400uF
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
DCV
ACV
Ω
D C mA A C mA
f
rpm
C
R1
400mV
400mA


*400Ω
*100Hz
*6000
*4nF
R2
*4V
*4V
*40mA
*40mA
4 kΩ
1000Hz
60000
40nF
R3
40V
40V
400mA
400mA
4 0 kΩ
10kHz
600k
400nF
R4
400V
400V


4 0 0 kΩ
100kHz

4uF
R5
4000V
4000V


4 0 0 0 kΩ
1000kHz

40uF
R6




40MΩ


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
RC 2
RC 3
D C V, AC V
D C mA, AC mA
Ω
C
H
H
H
400mA
4mA
400Ω
4nF
L
H
H
4V
40mA
4 kΩ
40nF
H
L
H
40V
400mA
4 0 kΩ
400nF
L
L
H
400V
4000mA
4 0 0 kΩ
4uF
H
H
L
4000V
4mA
4 0 0 0 kΩ
40uF
L
H
L
400mV
4mA
40MΩ
400uF
H
L
L
400mV
4mA
400Ω
4nF
L
L
L
400mV
4mA
400Ω
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
Selecti on
Termi nals
KI1
KI2
KI3
KI4
KI5
FC 1
D on't care
HOLD
MIN/MAX
MEN
READ
FC 2
D on't care
FRQ
AD P
REL
C AP
FC 3
D on't care
D C /AC
FC 4
rpm
V
mA
A
RANGE
Ω
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 : FC4→FC3→FC2→FC1
Control terminal : KI5 → KI4 → KI3 → KI2 → KI1
< Example of the switch circuit >
rpm
VSSD
V
mA
A
RANGE
Ω
DC/AC
FRQ
KI5
KI4
KI3
KI2
KI1
FC4
FC3
FC2
FC1
KMS
NJU9214
ADP
HOLD
MIN/MAX
REL
CAP
MEM
READ
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
Range up
Manual
1push(<1sec)
Rangi ng C ontrol
D efault
Range
1push(<1sec)
D
C
V
R1 to R5
(R5→R1)
400mV to 4000V
4V
D
C
V
R1 to R5
(R5→R1)
400mV to 4000V
4V
D
C
mA
R2 to R3
40mA to 400mA
40mA
D
C
mA
R2 to R3
(R3→R2)
40mA to 400mA
40mA
R1 to R6
(R6→R1)
400Ω to 40MΩ
400Ω
Resi stance ( Ω )
C onti nui ty (
D i ode (
→ HOLD
Ri → Ri +1 (R3 →R2)
400Ω
)
)
A
D
P
D
C
A
A
C
A
4V
400mV
F IX E D
40A
40A
Frequency ( f )
R1 to R5
Tacho ( r p m )
R1 to R3
C apaci tance ( C )
R1 to R6
100Hz to 999.9kHz
100Hz
6000rpm to
600krpm
6000rpm
4nF to 400uF
4nF
Auto-range
→ HOLD
Ri →Ri +1 (R6→R1)
( 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
DCV
AC V
D C mA
AC mA
Ω
f
rpm
C
R1
400mV
400mA
-
-
*400Ω
*100Hz
*6000
*4nF
R2
*4V
*4V
*40mA
*40mA
4 kΩ
1000Hz
60000
40nF
R3
40V
40V
400mA
400mA
4 0 kΩ
10kHz
600k
400nF
R4
400V
400V
-
-
4 0 0 kΩ
100kHz
-
4uF
R5
4000V
4000V
-
-
4 0 0 0 kΩ
1000kHz
-
40uF
R6
-
-
-
-
40MΩ
-
-
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
GND
COM
10A
0.01Ω
Ω
< Example of the Latching Relay Driver Circuit >
RD1 to RD4 are normally " H ". ( Active " L " )
SGND2
SGND1
0.99Ω
Ω
AGND
33k
33k
9Ω
Ω
SW1
100kΩ
Ω
,
,
Ω ,CAP
PTC 500Ω
Ω
IVSH
IVSL
ADP
OVX
SW5
SW2
0.1uF
DCmA,
ACmA
DCV, ACV ,
, , Ω, CAP,
ACV,ACmA,
FRQ,rpm
DCmA, ACmA,
OR2
1k
OR1
10k
VR5
VR4
100k
0.022uF
FRQ, rpm, ADP
100
SW7
others
SW3
others
VR3
1M
DC400mV,ADP
NJU9214
OVH
10M
100k
VR2
VI
ACOUT
VDDA
RMSIN
SW7
RD1 RD2 RD3 RD4
Rectifier circuit
block
VSSA
SW Changing coil of latching relay
RMS-DC Converter
Power source SW
VDDD
1kΩ X 14
SW1
RESET
SET
VDDD
74HC138
74HC138
SW3
16
15
14
13
12
11
10
9
16
15
14
13
12
11
10
9
SW4 is used into
1
2
3
4
5
6
7
8
VSSD
1
2
3
4
5
6
7
8
SW2
the rectifier circuit
block shown in the
SW4
Example of application
SW5
circuit.
SW8
VDDD
SW7
VSSD
VDDD
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
Ω,
,
Relay
RD 4
SW3
AC 400mV
S et
SW4
Ω,
SW5
AC A
SW6
AC mA,AC A,AC V,FRQ,rpm
SW7
S et
SW1
, C AP
D C mA, AD P
SW2
D C 400mA, AD P
SW3
AC 400mV
RD 3
SW2
D C 400mV, AD P
,
RD 2
SW1
, AP
D C mA, AC mA
Ω,
RD 1
Reset
SW4
Ω,
SW5
AC A
SW6
AC mA,AC A,AC V,FRQ,rpm
SW7
Reset
( 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 40Ω
[ 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
Power-on
Function changing
Range changing
Range(Auto range)
Default range
Default range
-
Range Hold
Data Hold
Relative Measure
Hold
Reset
Reset
Reset
MIN / MAX Hold
Data Memory
All " 0 " display
Hold
Hold
Auto power-off
Auto off
Auto off
Auto off
( 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
RC2
RC3
Mark Display Decimal Point
Application Example
H
H
H
Non
Non
hfe Measurement
L
H
H
AD P1
P1
°C ( Temp. Measurement )
H
L
H
AD P2
P1
F ( Temp. Measurement )
L
L
H
*
*
*
H
H
L
*
*
*
L
H
L
*
*
*
H
L
L
*
*
*
L
L
L
*
*
*
* : ( 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
8 bit data
D0 D1 D2 D3 D4 D5 D6 D7
BIT
STOP BIT
START
BIT
STOP BIT
START
D0 D1 D2 D3 D4 D5 D6 D7
0 1 0 0 1 1 1 0 0 1 0 1 0 1 1 1 0 0 0 1
DATA
39(HEX)
1 Character
DATA 1D(HEX)
1 Character
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
C HARAC TER
DCV
AC V
DCA
AC A
RESISTANC E
C onti nui ty
D i ode
C apaci tance
Frequency
Tacho
AD P
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
C haracter
Absolute Value
A
R
Relati ve Value
( 5 - 3 - 3 ) Sign
This sign shows the polarity of data.
S i gn
Character
Positive Number
+ (PLUS)
Negative Number
- (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
C haracter
Mega-
M
K
Ki lo-
(Space)
Nano-
m
µ
n
C ondi ti on
C haracter
Mi lli Mi cro-
( 5 - 3 -6 ) Buttery Life Detector
It shows the condition of buttery.
Normal
Low-Buttery warni ng
(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
overflow on the "+" side
Format pattern
DCV, A=+∗∗∗.∗∗m, [CR]
"∗∗∗.∗∗" shows overflow, "+" shows overflow on the positive side.
[ Ex.4 ] In DCV400mV range, when overflow is occurred on the negative voltage side by -401mV input.
Measured value
overflow on the "-" side
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]
[ Ex.7 ] In resistance 400kΩ range, when the following resistance is measured.
Measured value
100.10kΩ
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
C F
DC
µmVA
nFrpm
COM3
AUTO
MKΩHz
COM2
RS232C
COM1
0
10
20
30
40
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
( 7 - 2 ) Connection of Segment Line
BATT
REL
HOLD
MAX
MIN
MEN
APF
AC
C
F
µm V A
DC
n F rpm
AUTO
M k Ω Hz
RS232C
0
10
20
30
40
( 7 - 3 ) Segment Assignment
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9
SEG10
C OM1
BPN
BP2
BP4
BP6
BP7
BP9
PB11
P B 13
B P 14
B P 16
C OM2
BP0
BP1
BP3
BP5
d4
BP8
B P 10
B P 12
d3
B P 15
C OM3
BP-
-
AUTO
e4
g4
c4
P4
e3
g3
c3
C OM4
DC
BATT
AC
f4
a4
b4
REL
f3
a3
b3
SEG11 SEG12 SEG13 SEG14 SEG15 SEG16 SEG17
SEG18
SEG19 SEG20
C OM1
B P 18
B P 20
B P 21
B P 23
B P 25
B P 27
B P 28
B P 30
B P 32
B P 34
C OM2
B P 17
B P 19
d2
B P 22
B P 24
B P 26
d1
B P 29
B P 31
B P 33
C OM3
P3
e2
g2
c2
P2
e1
g1
c1
P1
e0
C OM4
HOLD
f2
a2
b2
MAX
f1
a1
b1
MIN
f0
SEG28
/
/
C OM1
SEG21 SEG22 SEG23 SEG24 SEG25 SEG26 SEG27
B P 35
B P 37
B P 39
B P 40
M
k
Hz
RS232C
/
/
C OM2
d0
B P 36
B P 38
n
F
rpm
Ω
/
/
/
C OM3
g0
c0
µ
m
V
F
A
/
/
/
C OM4
a0
b0
MEM
APF
/
/
/
°C
NJU9214
a4
a3
b4
b3
f4
g4
f3
e4
c4
e3
d4
BP-
a2
g3
c3
p4
d3
a1
b2
f2
e2
p3
b1
f1
g2
c2
e1
d2
p2
BPN
b0
f0
g1
c1
d1
e0
p1
g0
c0
d0
BP40
BP0
0
a0
10
20
30
40
BPN
BPN
BPN
BPN
( 7 - 4 ) Explanation of Display Mark
1.
2.
3.
4.
BATT
DC
AC
-
: 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( Ω ),
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. µF
: Displayed in capacitance measurement mode.( 4µF, 40µF, 400µF ranges )
19. Ω
: Displayed in resistance measurement mode.( 400Ω range )
20. kΩ
: Displayed in resistance measurement mode.( k Ω range )
21. MΩ : Displayed in resistance measurement mode.( MΩ 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.
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 ( Ω ), 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
( Ta=25°C )
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage Range
VD D A - VSSA
11
V
VD D D - VSSD
5.5
V
Control Terminal Voltage
Vi d
VDDD to VSSD
V
Analog Terminal Voltage
Vi a
VDDA to VSSA
V
Supply Teminal
IDD, IGND, ISS
50
OVH Terminal
IOVH
50
Others
II
10
Operating Temperature
Topr
0 to +50
°C
Storage Temperature Range
Tstg
-40 to +125
°C
Terminals
Current
mA
VDDD and VDDA must be same voltage level.
!ELECTRICAL CHARACTERISTICS
( 1 )DC Characteristics
( VDD = + 5.0V, VSSA= - 5.0V, AGND = DGND = 0V, DC400mV range, Ta=25°C)
PARAMETER
SYMBOL
Operating Voltage
VD D
CONDITIONS
MIN
TYP
MAX
UNIT
NOTE
4.75
5.0
5.25
V
1
IDD
VDD Terminal
-
-
1.5
mA
IPOF
VDD Terminal,in auto Power off
-
-
0.01
mA
Negative Supply Voltage
VSS
VDD Terminal
-5.25
V
Low-Battery Detection Voltage
V B LD
VBLD terminal
4.4
V
Operating Current
-4.75 -5.0
3.6
4.0
Digital Display
Linn
-
-
Bargraph
Ling
-
-
Digital Display
E pn
-
-
Bargraph
E pg
-
-
±5
%FS
Zero Reading Display
Zero
0
0
0
COUNT
Digital Display
tsn
-
100
-
Capacitance M.
tsnc
-
500
-
Bargraph
tsg
-
5
-
Digital Display
Nrn
-
2
-
Capacitance M.
Nrnc
-
1
-
Bargraph
Nrg
-
20
-
4.2
-
-
V
-
-
0.8
V
100
300
500
-
10
-
Linearity
Polarity
Error
Sampling
Time
Sampling
Rate
Input Series Resistor = 100k Ω
High Level Input Voltage
VIH
Low Level Input Voltage
VIL
TXS, TRX, FC1 to 4, RC0 to 3,
KI1 to 5, T1 to 3,
PON, KMS, RMS, RST Terminal
RI
TXS, TRX, FC1 to 4, RC0 to 3,
KI1 to 5, T1 to 3, PON Terminal
Input Pull-Up Resistance
RST Terminal
±0.07+2 %FS±COUNT
±5
%FS
±0.07+2 %FS±COUNT
ms
cyc./s
kΩ
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 ( 300kΩTYP. ) 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 ( 10kΩ TYP. ).
2
NJU9214
DC Characteristic (A/D conversion)
( VDD = +5.0V, VSSA = -5.0V, AGND = DGND = 0V, DC 400mV range, Ta = 25°C)
PARAMETER
SYMBOL
IOH1
Buzzer Driving Current
IOL1
IOH2
Digital Output Current
IOL2
IOH3
Select Terminal
Output Current
IOL3
CONDITIONS
BZ Terminal
MIN
TYP
MAX
VOH = 4.7V
0.25
0.75
-
VOL = 0.3V
-0.25
-0.75
-
DTR, TXD Terminal
RD1 to 4 Terminal
VOH = 4.6V
0.5
1.0
-
VOH = 0.4V
-0.5
-1.0
-
FC1 to 4 Terminal
(Push Switch Mode)
VOH = 4.6V
0.5
1.0
-
VOH = 0.4V
-0.5
-1.0
-
Open volltage
in Resistance Measurement
VOHM
used for Ω,
measurement
-
0.4
-
Charging Voltage
in Capacitance Measurement
VC AP
used for " C " measurement
-
5
-
VIN=0mV
-
-
± 10
VIN=±400mV
-
-
± 40
NOTE
mA
V
ILO
Input Leakage Current
UNIT
ILF
VI Terminal
LCD Driving Voltage
(VDSP is floating.)
VH
-0.9
-1.0
-1.2
VL
-1.8
-2.0
-2.2
LCD Driving Voltage
(VDSP and VSSD are shorted.)
VH
-1.4
-1.6
-1.8
-3.1
-3.3
-3.5
SEG1 to 28, COM1 to 4 Terminal
( vs VDDD Voltage )
VL
3
pA
V
4
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
0V
SW1
OVH
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, 25°C)
PARAMETER
SYMBOL
Buzzer Output Frequency
FB Z
BZ Termi nal
C OND ITIONS
D ata transmi ssi on rate
tOUT
TXD termi nal
LC D dri ver frequency
F LC D
Relay dri ver pulse wi dth
twrd
MIN
TYP
MAX
UNIT
-
2.0
-
kHz
(TXS:H)
-
2400
-
(TXS:L)
-
9600
-
SEG1 to 28,
C OM1 to 4 termi nal
-
50
-
Hz
RD 1 to 4 termi nal
-
10
-
ms
bps
NJU9214
!Examples of application circuit.
( 1 ) Circuit using lock type switch. ( Current Auto • Manual-2 range mode, RMS = " H " )
90
85
80
75
5
70
10
65
NJU9214
15
60
20
55
25
30
35
40
45
100uF
100uF
0.01u ∗1
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
100K
95
Regulator
50k
50k 180k
0.01u ∗1
VDDD
+5V
VSSD
4MHz
10p
10p
BZ
100K
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
1 100
VSSA
-5V
510Ω
Ω
ACOUT
VDDA VDDA
VDDA
+5V
10K
0.1u
180k
40k
30k
0.01u ∗1
0.33u ∗1
0.1u ∗ 1
33k
100k
33k
33k
0.1uF
10M ∗2
1M ∗2
∗
100K ∗2
10K ∗ 2
1K ∗ 2
100 ∗2
BATTERY
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
100K ∗ 2
0.01
SW5
Others:VR2 side
Rectification
circuit
block
0.99
100Ω
SW7
0.022uF
DC400mV:VI side
SW3
9
SW1
180k
SW2
Temperature coefficient:below 20ppm/ C
AGND
100uF
100uF
When AcmA/DcmA,SW2 is ON.
FRQ, rpm
AC measurement: AC coupling side
Reference Voltage element:over 2.5V
/ cap,
SW1 is ON.
ADP
DCmA, ACmA,
/
40k
, Ω , CAP,
When Ω /
FUSE
,
10A COM
FUSE
30k
DCV, ACV,
VSSD
VSSD
RS232C Driver
50
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
: Lock type switch
VSSD
BATT
REL
HOLD
MAX
MIN
: Push type switch
MEM
APF
C
AC
DC
F
µmVA
AUTO
nFrpm
M k Ω Hz
0
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 " )
10A COM
When Ω /
/
90
85
80
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
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
5
70
10
65
NJU9214
15
60
20
55
25
30
35
40
45
100uF
100uF
AGND
0.1u
0.01u ∗1
0.33u ∗1
0.1u ∗1
33k
100k
33k
33k
95
50
100K
1 100
VSSD
10p
4MHz
10p
100K
ACOUT
VDDA VDDA
VSSA
-5V
VDDD
+5V
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
10M ∗ 2
1M ∗2
100K ∗2
10K ∗2
1K ∗2
100 ∗ 2
100K ∗2
SW3
Regulator
SW5
0.1uF
100uF
Others:VR2 side
100uF
100Ω
SW7
0.022uF
DC400mV:VI side
510Ω
Ω 0.01u ∗ 1
0.01
SW1
50k
AC measurement:AC coupling side
50k 180k
0.1
ADP
BATTERY
VDDA
+5V
10K
0.01u ∗1
0.9
180k
4000mA
Temperature coefficient:below 20ppm/ C
When AcmA/DcmA,SW2 is ON.
180k
FRQ, rpm
9
40k
400mA
SW1 is ON.
40k
40mA
DCmA, ACmA,
Reference Voltage element:over 2.5V
/ CAP,
99
30k
, Ω , CAP,
4mA
30k
,
FUSE
FUSE
DCV, ACV,
BZ
VSSD
VSSD
RS232C Driver
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
: Lock type switch
VSSD
BATT
REL
HOLD
MAX
MIN
: Push type switch
MEM
APF
C F
AC
DC
µmVA
AUTO
nFrpm
MkΩHz
0
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.
NJU9214
( 3 ) Circuit using push type switch ( Current Auto • Manual-2range mode, KMS = " L " )
FUSE
10A
COM
Reference Voltage element:over 2.5V
When Ω /
/
/ cap,
When ACmA/DCmA,SW2 is ON.
RMSIN
VDDD VDDD
RD1
RD2
RD3
RD4
TXS
TRX
KMS
RMS
RC0
RC1
RC2
RC3
FC1
FC2
FC3
FC4
KI1
KI2
KI3
KI4
KI5
90
85
80
5
70
10
65
NJU9214
15
60
20
55
25
30
35
40
45
50
Regulator
100uF
AGND
100uF
100uF
100uF
0.01u ∗ 1
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
75
100K
95
0.1u
50k
50k 180k
0.01u ∗ 1
0.33u ∗ 1
0.1u ∗ 1
33k
100k
33k
33k
10M ∗2
1M ∗2
∗
100K ∗2
10K ∗2
1K ∗2
100 ∗2
1 100
VSSA
-5V
VSSD
10p
4MHz
10p
BZ
100K
ACOUT
VDDA VDDA
BATTERY
VDDA
+5V
10K
VDDD
+5V
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
100K ∗2
0.1uF
180k
SW5
0.022uF
40k
0.01
100Ω
SW7
DC400mV:VI side
Others:VR2 side
0.99
30k
9
SW1
180k
AC measurement:AC coupling side
40k
SW2
FRQ, rpm
30k
FUSE
ADP
DCmA, ACmA,
SW3
Temperature coefficient:below 20ppm/ C
SW1 is ON.
, , Ω , CAP,
510Ω
Ω 0.01u ∗ 1
DCV, ACV,
VSS
VSSD
RS232C Driver
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
: Lock type switch
VSSD
BATT
REL
HOLD
MAX
MIN
: Push type switch
MEM
APF
C F
µmVA
nFrpm
MkΩHz
RS232C
AC
DC
AUTO
0
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.
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)
0.022uF
ACOUT(PIN1)
VDDA
SW4_1
RMSIN(PIN3)
AC4V to 4000V range
1N4148
SW4_2
47K
10uF
1N4148
AD736
1
AC400mV
Full-wave
rectifier
VSSA
2
3
8
AGND
7
VDDA
6
RMS
AC400mV
4
Converter
block
Rectifier circuit block
10uF
5
+
33uF
VSSA
( 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.