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ES51968(6600counts)
Dual Display/Inrush
Features
* 6,600 counts dual LCD display * 128L QFP package * 3.3V DC power supply * Slow ADC Conversion rate : 2.8 times/s * Bar-graph ADC conversion rate: 28 times/s * Full automatic measurement *Voltage measurement: 660.0mV - 1000V *Current measurement: A/mA/A *Frequency sub-display with Voltage or Current mode (VAHz): 66.00Hz ~ 66.00kHz *Resistance measurement: 660.0 - 66.00M *Resistance measurement for Clampmeter mode: 660.0 - 66.00K *Capacitance measurement: 6.600nF - 66.00mF *Frequency counter with duty cycle display: 66.00Hz - 66.00MHz 1% - 99% (< 10kHz) * Current modes for clamp meter with ZERO function * AC modes with frequency dual display * Diode measurement * Continuity check * 4 ADP modes with external reference voltage and independent "ADP" segment on LCD panel * Temperature mode with internal scale translation circuit from 0C to 0F * Push functions: *KEY function *Range change function *Inrush function: ACA clampmeter only *Relative function *Zero function: DCA clampmeter only *Data hold function with data record feature *MAX/MIN function *Back light function v2.5 1 09/04/14 * Low pass filter auto switching mode for ACA/ACV measurement * Band-gap reference voltage output * CE selection (DC/AC 1010V, DC/AC 610V) * Serial data output (RS232 format) * LCD segment check when power on * Auto power off (30min/15min) * Sleep state indicative signal output * Re-power on * On-chip buzzer driver * Low battery detection
Description
ES51968 is an integrated analog-to-digital converter (ADC) with dual 6,600-count LCD display (4-digit main-display and 4-digit sub-display), automatic range selection, and 3.3V DC power supply. Automatic range selection is provided for voltage (AC/DC) measurement, resistance measurement, current measurement, capacitance measurement, and frequency counter. Expensive and bulky mechanical range switches are not required. Other features include inrush function, relative value display, offset removing feature for DCA clampmeter, data holding, maximum and minimum value holding, duty cycle measurement, diode measurement, temperature measurement, continuity checking, low battery detection, auto power off, re-power on, backlight driver, buzzer driver and RS232 data output.
ES51968(6600counts)
Dual Display/Inrush
Application Digital multimeter Clamp meter
Pin Assignment
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ES51968
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Dual Display/Inrush
Pin Description
Pin No 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 v2.5 Symbol V+ DGND AGND AGND CH+ CHCIH BUFFH CAZH CL+ CLCIL CAZL BUFFL RAZ IVSH IVSL OVX OVH OVSG OR1 VR5 VR4 VR3 VR2 TEST5 ACVL ACVH ADI ADO OHMC3 OHMC2 OHMC1 VRH VR VA+ VASGND ADP VR1 CACA+ R9K R1K NC NC CSH+ CSHLPFC1 Type O P/G P/G P/G IO IO O O O IO IO O O O O I I I O O O O O O O O O O I O O O O O I I I G I I IO IO O O IO IO O Description Output of on-chip DC-DC converter. Digital ground. Analog ground. Analog ground. Positive connection for reference capacitor of high-speed A/D. Negative connection for reference capacitor of high-speed A/D. High-speed integrator output. Connect to integral capacitor. High-speed buffer output pin. Connect to integral resistor. High-speed auto-zero capacitor connection. Positive connection for reference capacitor of high-resolution A/D. Negative connection for reference capacitor of high- resolution A/D. High-resolution integrator output. Connect to integral capacitor. High-resolution auto-zero capacitor connection. High-resolution Buffer output pin. Connect to integral resistor Buffer output pin in AZ and ZI phase. Current measurement input for 6600A, 660mA and 66A modes. Current measurement input for 660A, 66mA. Sense input for resistance/capacitance measurement Output connection for resistance measurement Sense low voltage for resistance/voltage measurement Reference resistor connection for 660.00 range Voltage measurement /10000 attenuator(1000V) Voltage measurement /1000 attenuator(660.0V) Voltage measurement /100 attenuator(66.00V) Voltage measurement /10 attenuator(6.600V) Buffer output of OVSG DC signal low input in ACV/ACA mode. Connect to negative output of external AC to DC converter. DC signal high input in ACV/ACA mode. Connect to positive output of external AC to DC converter. Negative input of internal AC to DC OP Amp. Output of internal AC to DC OP Amp. Filter capacitor connection for resistance mode. Filter capacitor connection for resistance mode. Filter capacitor connection for resistance mode. Output of band-gap voltage reference. Typically -1.23V Reference input voltage connection. Typically -400mV For ADP mode. De-integrating voltage positive input. The input should be higher than VA-. For ADP mode. De-integrating voltage negative input. The input should be lower than VA+. Signal Ground. Measurement input in ADP mode. Measurement Input. Connect to a precise 10M resistor. Negative auto-zero capacitor connection for capacitor measurement Positive auto-zero capacitor connection for capacitor measurement Connect to a precise 9K resister for capacitor measurement. Connect to a precise 1K resister for capacitor measurement. Cap for duty-cycle mode Cap for duty-cycle mode Capacitor C1 connection for internal low-pass filter 3 09/04/14
ES51968(6600counts)
Dual Display/Inrush
50 51 52 53 54 LPFC2 LPFC3 LPFOUT SLEEP VBAR O O O O I I I O O O O O O Capacitor C2 connection for internal low-pass filter Capacitor C3 connection for internal low-pass filter Capacitor C1 connection for internal low-pass filter Sleep mode indicator, asserts low in SLEEP mode. In temperature mode, it is used to control decimal point. In A or mA modes, it is used to control the `' or `m' sign. Pull to V- to enable the BUZOUT. Frequency counter input, offset V-/2 internally by the chip. LCD segment line 01 - 35 LCD backplane 4 LCD backplane 3 LCD backplane 2 LCD backplane 1 Square wave output at the backplane frequency, synchronized to BP1. ANNUNC can be used to control display annunciator. Connect a LCD segment to ANNUNC to turn it on; connect an LCD segment to its backplane to turn it off. LCD bias voltage bypass capacitor Pulse to V- to enable HOLD function. Pulse to V- to enable manual mode and manual range selection. Pulse to V- to enable Relative function or Zero function. Pulse to V- to change mode. In ADP mode, if this pin is connected to V-, the buzzer output will be off when the ADP input overflows. Pulse to V- to enable MAX/MIN function. Pulse to V- to enable the INRUSH function for clamp ACA mode Back light function. Pulse low to set BKOUT pin output. Assert low to enable serial data output. Outputs a 2KHz audio frequency signal for driving piezoelectric buzzer when BUZIN is low. If BKLIT function is enabled, this pin will change from V- to V+ For 60 sec, once press BKLIT pin again within 60 sec, this pin will Change back to V-. Crystal oscillator output connection Crystal oscillator input connection Pull to V- to enable display-shift feature on duty cycle mode Idle time selection for auto power off feature. Pull to V- to enable the auto range voltage mode to start from 660.0V Pull to V- to disable the internal Low pass filter in measurement CE selection feature control pin. Switch 5 for function selection. Switch 4 for function selection. Switch 3 for function selection. Switch 2 for function selection. Switch 1 for function selection. Select initial state. Serial data output Positive capacitor connection for on-chip DC-DC converter. Negative capacitor connection for on-chip DC-DC converter. Low battery configuration input. If battery is used, the low battery segment is displayed when the voltage of this pin is less than VRH (-1.23V) Negative supply voltage. Negative supply voltage. Output of on-chip DC-DC converter.
55 BUZIN 56 FREQ 58 - 92 SEG35 - SEG01 93 BP4 94 BP3 95 BP2 96 BP1 97 ANNUNC
98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128
LCDCAP HOLD RANGE REL_ZERO KEY MAX/MIN ENIR BKLIT RS232 BUZOUT BKOUT OSC2 OSC1 SHIFT APOSEL VST LPFOFF CESEL FC5 FC4 FC3 FC2 FC1 SLACDC SDO C+ CLBAT9 VVV+
I I I I I I I I I O O O I I I I I I I I I I I I O O O I P P O
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Absolute Maximum Ratings
Characteristic Supply Voltage (V- to AGND) Analog Input Voltage V+ AGND/DGND Digital Input Power Dissipation. Flat Package Operating Temperature Storage Temperature Rating -4V V- -0.6 to V+ +0.6 V+ (AGND/DGND+0.5V) AGND/DGND (V- -0.5V) V- -0.6 to DGND +0.6 500mW 0 to 70 -25 to 125
Electrical Characteristics
TA=25, V- = -3.3V
Parameter Power supply Operating supply current In DCV mode Voltage roll-over error Voltage nonlinearity Input Leakage Zero input reading Band-gap reference voltage VREF Open circuit voltage for 660 measurement Open circuit voltage for other measurement Peak to peak backplane drive voltage Internal pull-high to 0V current AC frequency response at 6.600V range 3dB frequency for LPF mode Reference voltage temperature coefficient Capacitance measurement accuracy Note: 1. Full Scale 2. When capacitance measurement (Clamp mode) is selected, the additional error 1% should be increased. v2.5 5 09/04/14 TCRF Symbol Test Condition VIDD Normal operation In sleep mode ISS REV 10M input resistor Best case straight NLV line 10M input resistor 100K resistor between VRH and AGND Min. -- -- -- -- -- -10 -000 -1.3 -- -1.19 -3.5V V -2.2V Between V- pin and HOLD, RANGE, KEY, FC1-FC5 BKLIT,MAXMIN Between V- pin and RS232 1% 5% LPF auto ON when Hz < 500Hz (+3%) 100K resister Between VRH 0ES51968(6600counts)
Dual Display/Inrush
Function Description 1. Dual Display
1.1 Introduction ES51968 configures a dual display LCD driver for multi-meter applications. The dual display includes main-display and sub-display. Each display has 4 digits to show up to 6600 counts. The simplified representation of dual display is shown below. Main-display always shows current measurement value, however sub-display usually shows sub-measurement mode or some special reading, for example, maximum reading, minimum reading, and reference value of relative mode. By the dual display feature, ES51968 can also shows two different measurement mode at the same time, for example, AC voltage with frequency, frequency mode with duty cycle. It's very convenient for user to observe the ac voltage and frequency at the same time without changing the rotary switch or pushing any function button. Other features achieved by dual display will be introduced in later sections. The full LCD configuration is shown at section 6.1 of page 28. Sub-Display
Main-Display
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1.2 Dual display V.S. measurement mode The main-display always shows reading in main measurement mode, and sub-display shows reading in sub-measurement mode or special function. The configuration is shown at the table below. Main measurement mode Main-display Sub-display default DC voltage DC voltage N/A AC voltage AC voltage frequency DC current DC current N/A AC current for multimeter AC current frequency AC current for clampmeter AC current frequency Resistance mode Resistance N/A Capacitance mode Capacitance N/A Frequency mode Frequency Duty cycle Continuity Check Resistance N/A Diode mode Voltage N/A Temperature mode Temperature N/A ADP mode A/D result N/A Note: N/A means that sub-display shows nothing if no push function is enabled. 1.3 Dual display V.S. push function With dual display, user can observe current measurement result and special function at the same time. In other single-display DMM, it can not show the current value when some special function, for example, Relative, Max/Min, is enabled. In order to see the current measurement value, the enabled function must be canceled. Push function Main-display Sub-display Enable Hold Stop updating Stop updating Max/Min Current value Max. or Min. of current value Relative Relative value1 Reference Value 2 Zero Modified value N/A Inrush (waiting state) Four bars (- - - -) Four bars (- - - -) Inrush (done) Current value Inrush value 1 Relative value = Current A/D result - Reference value 2 Modified value = Current A/D result - zero offset value.
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2.
Operating Modes
2.1. Voltage Measurement A re-configurable voltage divider automatically provides a suitable range in voltage measurement mode. The following table summarizes the full-scale ranges in each configuration.
Configuration 1 VR1 VR2 VR3 2 VR4 VR5 Note: 1. 2. 660.0mV range only exists in manual mode. If VST (pin113) is set to V- level, the auto range mode will start from 660.0V range. 660.0mV - 66.00V ranges only exist in manual mode Full Scale Range 660.0mV 6.600V 66.00V 660.0V 1000V Divider Ratio 1 1/10 1/100 1/1000 1/10000 Resister Connection VR1 (10M) VR2 (1.111M) VR3 (101K) VR4 (10.01K) VR5 (1K)
2.1.2 CE selection ES51968 has a CE selection feature archived by configuring the pin CESEL. In automatic voltage mode, ES51968 will show OL when the voltage is over than the overflow level. If CESEL is connected to V- or DGND, ES51968 will have a 610.0V or 1010V overflow level in voltage mode relatively. If CESEL keeps floating, the overflow level will be set to 1510V in DCV and ACV mode. The configuration of CESEL is listed below. For fully automatic voltage modes: CESEL floating VDGND DCV 1510V 610V 1010V ACV 1010V 610V 1010V
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2.2 Resistance Measurement A re-configurable divider automatically provides a suitable full-scale range in resistance measurement mode. The following table summarizes the full-scale ranges and the reference resistors in each configuration. When the function code is set to FC1~5=(0,1,0,1,0), ES51968 enters the resistance mode for clampmeter. It only has 3 ranges from 660.0 to 66.00K.
Configuration OR1 OR2 OR3 OR4 OR5 OR6 Full Scale Range 660.0 6.600K 66.00K 660.0K 6.600M 66.00M Relative Resistor OR1 VR5 VR4 || VR1 VR3 || VR1 VR2 || VR1 VR1 Equivalent value 100 1K 10K 100K 1M 10M
2.3 Current measurement for multimeter ES51968 has 2 automatic and 1 manual current measurement modes for multimeter. The following table summarizes the full-scale range of each mode. When ES51968 operates in the current measurement modes for multimeter, It takes high input from pin IVSH or IVSL, low input from pin SGND and reference voltage from pin VR.
1 VBAR Mode FC1~4 Full Scale Input Terminal Automatic1 1,1,0,1 1 660.0A / 6600A IVSL/IVSH V.S. SGND (66mV) Automatic2 1,1,1,1 1 66.00mA / 660.0mA IVSL/IVSH V.S. SGND (66mV) Manual 0,0,0,0 X 66.00A IVSH V.S. SGND (66mV) Note: 1. Connect VBAR to V- will disable the "2" / "m2" symbol on LCD panel.
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2.4 Current measurement for clampmeter ES51968 has 2 automatic and 4 manual current measurement modes for Clampmeter. The following table summarizes the full-scale range of each mode. When ES51968 operate in the automatic mode1&2, it takes high input from IVSH/IVSL (higher range/lower range), low input from SGND and reference voltage from VR. When ES51968 operates in the manual mode1~4, It takes high input from ADP, low input from SGND and reference voltage from VA+ and VA-.
1 VBAR Full Scale Input Terminal Mode FC1~4 Automatic1 1,1,0,1 0 660.0A / 6600A IVSL/IVSH V.S. SGND (66mV) Automatic2 1,1,1,1 0 66.00A / 660.0A IVSL/IVSH V.S. SGND (66mV) Manual1 1,1,0,0 X 6.600A ADP V.S. SGND (660mV) Manual2 1,0,0,0 X 66.00A ADP V.S. SGND (660mV) Manual3 1,0,1,0 X 660.0A ADP V.S. SGND (660mV) Manual4 1,0,0,1 X 6600A ADP V.S. SGND (660mV) Note: 1. Connect VBAR to V- will disable the "2" / "m2" symbol on LCD panel. Inrush mode could be active when VBAR=0. 2. In DC current modes for clampmeter, ES51968 provides Zero function for offset removing.
2.5 Low pass filter (LPF) mode for ACA/ACV mode A 3rd order low-pass filter with is built in ES51968. The LPF mode is active automatically when the input AC frequency of voltage or current is less than 500Hz. That means if the frequency is lower, the LPF mode (3dB BW = 7.5kHz typ.) will be helpful to filter-out the high frequency noise of the main signal. When LPFOFF (pin 114) is pulled to V-, the LPF mode will be disabled always. For Inrush mode is active, the auto LPF is active always even LPFOFF is enable.
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2.6 Capacitance Measurement The following table summarizes the eight ranges of capacitance measurement mode.
Configuration C1 C2 C3 C4 C5 C6 C7 C8 Note: 1. In order to obtain an accurate reading, a capacitor must be discharged before measurement begins. The chip has a built-in discharge mode to automatically discharge the capacitor. In discharge mode, the main-display shows dIS.C 2. Discharging through the chip is quite slow. We recommend users to discharge the capacitor with some other apparatus. 3. The C2 range is calibrated by the VR near to the OVX pin. 4. The C1 range zero offset could be compensated by the small capacitors near to OVH pin. 5. When capacitance measurement (Clamp mode) is selected, C7-C8 range measurement period will be double Full Scale Range 6.600nF 66.00nF 660.0nF 6.600uF 66.00uF 660.0uF 6.600mF 66.00mF Relative Resistor Measurement Period 0.35 sec 3 0.35 sec 50k VR 0.35 sec 101k 0.35 sec 10.01k 0.7 sec R9K / R1K 1.4 sec R9K / R1K 1.4 sec R9K / R1K 7.0 sec R9K / R1K
2.7 Continuity Check Continuity check shares the same configuration with 660.0 manual resistance measurement mode and has buzzer output to indicate continuity. The buzzer generates 2KHz beep whenever the reading is less than 30. 2.8 Diode Measurement Diode measurement mode shares the same configuration with 6.600V manual voltage measurement mode and has buzzer output to indicate continuity. The buzzer generates a 2KHz sound whenever the reading is less than 30mV. If the test circuit is open or the voltage drop between the two ports of the device(diode) under test is larger than 2V, the LCD panel will show "OL".
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2.9 Frequency counter In frequency mode, main-display shows frequency and sub-display shows duty cycle at the same time. The time base of the frequency counter is derived from an external crystal oscillator by Tcounter = 4,000,000 Fosc
where Fosc is the frequency of the crystal oscillator. Thus, the counter has a 1-second time base when a 4MHz oscillator is used. The frequency counter can select the proper range automatically or manually. Auto-range operation extends over seven decades, from 66.00Hz to 66.00MHz. The following table summarizes the full-scale range of the frequency counter.
Range FR1* FR2 FR3 FR4 FR5 FR6 FR7 Full Scale 66.00Hz 660.0Hz 6.600KHz 66.00KHz 660.0KHz 6.600MHz 66.00MHz
*If input frequency is less than 6.0Hz, ES51968 will show 0.00Hz
2.10 Temperature measurement mode Temperature measurement mode takes input signal from ADP pin and reference voltage from (VA+ - VA-). ES51968 has a built-in C-to-F scale translation circuit, and only needs an external C scale application circuit. The application circuit for F scale is not required. In temperature measurement mode, the default range is 6600 C or 9999 F. The VBAR pin is used to control the first decimal point (DP1) on the LCD panel. When VBAR is pulled to V-, DP1 will be turned on and the full scale becomes 660.0 C or 999.9 F. 2.11 Duty Cycle measurement The duty cycle measurement is available in frequency mode simultaneously. The duty cycle mode range is within 1.00% to 98.90% (< 10kHz@3Vpp). The minimum resolution is 0.01%. If the source frequency duty cycle is smaller than 0.9%, the 0.00% will be shown on the LCD display. If the duty cycle is larger than 98.9%, the OL will be shown on the LCD sub-display. If the SHIFT pin is pull to V-, a display shifted feature is available for duty-cycle mode. The minimum resolution is 0.1% when SHIFT is active. When the frequency is zero, the duty cycle display will be 0.00% or OL shown.
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2.12 Auto power off and idle time selection ES51968 has a default auto power off function. If the meter is idle for more than the given Idle Time, the chip automatically turns the power off. The idle time to trigger the auto power off function is determined by pin `APOSEL'. If pin APOSEL is connected to V-, the Idle Time will be set to 30 minutes. If pin APOSEL is connected to DGND or floating, the Idle Time will be set to 15 minutes. When APO happens, the state of the meter is saved. The APO sign on the LCD panel indicates whether the auto power off is enabled or not. In some cases, user might want to disable Auto power off. There are two ways to disable this feature as following: 1. Power on the meter when any of the push functions, except for HOLD, is pressed down. 2. In addition, when RS232 output is active, the auto power off function is also disabled.
Note: Powering on the meter while pressing HOLD and lasts 2 seconds turns on all LCD segments until HOLD is pressed again.
2.13 Sleep The meter enters sleep mode after auto power off. The SLEEP pin asserts low (V-) in the sleep mode, and asserts high (V+, not 0V) after re-power on. 2.14 Re-power on After auto power-off, pushing any of the push function or changing the rotary mode can turn on the meter again. If the meter is re-powered on by changing the rotary mode, the saved state is cleared. If the meter is re-powered on by push functions, the chip restores the saved state and enters HOLD mode. The LCD displays the saved value.
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3. Measurement Mode Switching Measurement mode depends on the logic level of SLACDC, FC1, FC2, FC3, FC4, FC5, and KEY. When FC5 is high, the measurement mode list is below.
SLACDC 0 0 0 0 X 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 X FC1 1 1 1 0 1 1 1 1 1 0 0 0 0 0 0 1 1 1 0 1 1 1 1 0 0 0 0 0 0 0 FC2 0 1 1 0 1 1 0 0 0 0 0 1 0 1 1 0 1 1 0 1 0 0 0 0 0 1 0 1 1 1 FC3 1 0 1 0 1 0 0 1 0 1 0 1 1 1 0 1 0 1 0 0 0 1 0 1 0 1 1 1 0 0 FC4 1 1 1 0 0 0 0 0 1 1 1 1 0 0 0 1 1 1 0 0 0 0 1 1 1 1 0 0 0 1 Mode Voltage Measurement 12 Auto DC Current Measurement(A) 12 Auto DC Current Measurement(mA) 1 66A DC Current Measurement(A) -- 2 Manual DC 6.600A 2 Manual DC 66.00A 2 Manual DC 660.0A 2 Manual DC 6600A Resistance Measurement Continuity Check Resistance Measurement Frequency Measurement Capacitance Measurement Temperature Measurement Voltage Measurement 12 Auto AC Current Measurement(A) 12 Auto AC Current Measurement(mA) 1 66A AC Current Measurement(A) 2 Manual AC 6.600A 2 Manual AC 66.00A 2 Manual AC 660.0A 2 Manual AC 6600A *ADP0 (6600) *ADP1 (660.0) *ADP2 (66.00) *ADP3 (6.600) Capacitance Measurement (Clamp)3 Temperature Measurement Resistance Measurement Function of KEY DCV ACV DCA ACA DCA ACA DCA ACA -- DCA ACA DCA ACA DCA ACA DCA ACA Continuity Continuity Diode Continuity Diode -- -- ACV DCV ACA DCA ACmA DCmA ACA DCA ACA DCA ACA DCA ACA DCA ACA DCA -- -- -- -- -- Diode
X means "don't care". *When FC5 is high, the ADP0, ADP1, ADP2 and ADP3 modes can display minus sign.
1
These modes could be designed for multimeter current modes, please refer to section 2.3. These modes could be designed for clampmeter current modes, please refer to section 2.4. The external protection resistance of OVH path is allowed to be 2k PTC+ max 2k fixed resistor. The OVX 1nF.
2
3
capacitor should be modified from 220pF
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When FC5 is low, the KEY function is disable. The measurement mode list is below.
SLACDC 0 0 0 0 X 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 X FC1 1 1 1 0 1 1 1 1 1 0 0 0 0 0 0 1 1 1 0 1 1 1 1 0 0 0 0 0 0 0 FC2 0 1 1 0 1 1 0 0 0 0 0 1 0 1 1 0 1 1 0 1 0 0 0 0 0 1 0 1 1 1 FC3 1 0 1 0 1 0 0 1 0 1 0 1 1 1 0 1 0 1 0 0 0 1 0 1 0 1 1 1 0 0 FC4 1 1 1 0 0 0 0 0 1 1 1 1 0 0 0 1 1 1 0 0 0 0 1 1 1 1 0 0 0 1 Mode DC Voltage Measurement 12 Auto DC Current Measurement(A) 12 Auto DC Current Measurement(mA) 1 66A DC Current Measurement(A) 2 Manual DC 6.600A 2 Manual DC 66.00A 2 Manual DC 660.0A 2 Manual DC 6600A Resistance Measurement Continuity Check Diode Measurement Frequency Measurement Capacitance Measurement Temperature Measurement () AC Voltage Measurement 12 Auto AC Current Measurement(A) 12 Auto AC Current Measurement(mA) 1 66A AC Current Measurement(A) 2 Manual AC 6.600A 2 Manual AC 66.00A 2 Manual AC 660.0A 2 Manual AC 6600A *ADP0 (6600) *ADP1 (660.0) *ADP2 (66.00) *ADP3 (6.600) Capacitance Measurement (Clamp)3 Temperature Measurement () 4 Resistance Measurement (Clamp) KEY
X means "don't care". *When FC5 is low, the ADP0, ADP1, ADP2 and ADP3 modes can NOT display minus sign.
1
These modes could be designed for multimeter current modes, please refer to section 2.3. These modes could be designed for clampmeter current modes, please refer to section 2.4. The external protection resistance of OVH path is allowed to be 2k PTC+ max 2k fixed resistor. The 1nF. This mode has 3 ranges only from 660.0 (with continuity check) to 66.00K.
2
3
OVX capacitor should be modified from 220pF
4
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4. Push function All the enabled push functions will be reset when the measurement mode is changed by rotary switch. Change measurement mode by KEY function will reset enabled Range, Hold, Max/Min, REL, Inrush and Zero functions. The following table lists the available function versus every measurement mode. Function Mode Voltage Current Mode for Multimeter 2 Current Mode for Clampmeter Resistance Frequency Capacitance Continuity Diode Temperature ADP Note:
1 2
Range O O O O O O X X X X
Hold O O O O O O O O O O
Max/Min O O O O X O O O O O
REL O O AC O X O O O O O
Zero X X DC X X X X X X X
Inrush X X AC X X X X X X X
1
Include automatic A, automatic mA and manual 66A modes, please refer to section 2.3. Include 2 automatic modes and 4 manual modes, please refer to section 2.4.
4.1. HOLD and Delay Hold feature HOLD mode makes the meter stop updating the LCD panel. This mode can be nested in most of the special modes. Enabling HOLD function in automatic mode makes the meter switch to manual mode, but the full-scale range remains the same. ES51968 provides a Delay HOLD feature. To activate Delay HOLD feature, press down the HOLD bottom and last for 2 seconds. The meter will delay for 6 seconds, than enters HOLD mode. In the 6-secnod delayed time, the HOLD symbol on LCD panel will blink. HOLD function and the delayed state can be cancelled by changing the measurement mode, pressing RANGE, or push HOLD again.
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Normal mode Push < 2s HOLD mode (Auto/Manual) Push < 2s (Manual) Push > 2s Push < 2s Delay State (Auto/Manual) Push > 2s 6sec past
4.2. Range RANGE pin switches to and from automatic and manual mode, and while in manual mode, changes the full-scale range. The following figure shows the state transition.
1 push < 1 sec
Automatic Mode
1 push > 1 sec
Manual Mode Range up
1 push < 1 sec
Control Range 660.0mV - 1000V 660.0A - 6600A 66.00mA - 660.0mA 66.00A 66.00A - 660.0A 660.0A - 6600A 6.600nF- 66.00mF 660.0 - 66.00M 660.0 - 66.00K 660.0 6.600V 66.00Hz - 66.00MHz Initial Range 6.600V 660.0A 66.00mA 66.00A 66.00A 660.0A 6.600nF 660.0 660.0 660.0 6.600V 66.00Hz
Measurement Mode
Manual VRi VRi + 1, V(DC/AC) VR2 - VR5 VR5 VR1 R1 R2, Auto A(DC/AC) R1 - R2 R2 R1 R1 R2 Auto mA(AC/DC) R1R2 R2 R1 66 A(DC/AC) fixed fixed R1 R2 Auto 66A/660A R1R2 (DC/AC) R2 R1 R1 R2 Auto 660A/6600A R1R2 (DC/AC) R2 R1 Ci Ci + 1, Capacitance C1 - C8 C8 C1 ORi ORi + 1, OR1 - OR6 OR6 OR1 ORi ORi + 1, (Clamp) OR1 - OR3 OR3 OR1 Continuity fixed fixed Diode fixed fixed FRi FRi + 1 Frequency FR1 - FR7 FR7 FR1
Auto
Note: Pushing RANGE resets all existing special modes.
4.3. KEY See Section "Measurement Mode Switching" for the function of this pin.
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Dual Display/Inrush
4.4. REL + HOLD In REL mode, the main-display shows DN+K - DN(relative value), where N = 1, 2, 3, ... ,and the DN value is shown on sub-display. DN(reference value) is the last value before REL is pushed, and DN+K is the current value. The meter returns to normal operation if REL is pressed again. Pressing HOLD in REL mode makes the meter stop updating the LCD panel.
push REL push HOLD
Original State (Auto/Manual)
push REL
RELactive. The relative value
RELandHactive. Hold the relative value
push HOLD
Note: It's possible that relative value exceeds 6,600 or -6,600 counts, but never exceeds 9,999 or -9,999 counts. Such relative values are displayed. The LCD shows OL in REL mode only if DN or DN+K is more than 6,600 counts or the relative value is more than 9,999. 4.5. Max/Min + HOLD The meter displays maximum or minimum value of input in Max/Min mode. When Max/Min is pressed for the first time, sub-display shows maximum value. Sub-display shows minimum value, when it is pressed again. Main-display always shows current value in Max/Min mode. The meter returns to normal operation if Max/Min is pressed and held for longer than one second. Pressing HOLD in Max/Min mode makes the meter stop updating the maximum or the minimum value.
Original state (Automatic/manual) 1 push>1s 1push<1s 1push<1s Push HOLD Push HOLD "MIN" "H" active "MAX" "H" active hold max value. 1push<1s hold min value. 1push<1s 1 push>1 sec "MIN" active min value
1 push<1s
"MAX" active max value
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ES51968(6600counts)
Dual Display/Inrush
4.6. Relative + Max/Min + HOLD Max/Min mode can be nested in REL mode. Sub-display shows maximum or minimum value which is relative to the reference and shows the reference value when Max/Min is pressed in REL mode. Main-display always shows current relative value. Pressing HOLD under REL + Max/Min makes the meter stop updating the LCD panel. Original State (Auto/Manual)
Push REL Push REL
MD: Main-Display SD: Sub-Display
RELactive. MD: relative value, SD: reference value
Push Max/Min REL andMaxactive. Push Max/Min > 1s
RELandMinactive. SD: Minimum rel. value
REL Max Min blink. SD: Reference value
SD: Maximum rel. value
Push Max/Min Push HOLD
Push Max/Min Push HOLD Push HOLD
REL,Max, Hactive. Hold max. rel. value
REL, Min, Push Max/Min
Hactive. Hold min. rel. value
Push Max/Min Push Max/Min
REL Max , Min , , Hblink. Hold the reference value
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Dual Display/Inrush
4.7. INRUSH function ES51968 provides an INRUSH function for AC current measurement for clampmeter to dectect the starting-up current of a motor. Push ENIR key to enable the INRUSH function. In INRUSH mode, main-display and sub-display all show "- - - -" until the motor starting up and being detected. If the starting-up current is detected, ES51968 execute the inrush current measurement and held the INRUSH value with 100ms integration period at sub-display. Then ES51968 enters normal run and the main-display shows the normal run current value. When the inrush current measurement is done, press ENIR could enter INRUSH mode again. To exit INRUSH mode, press ENIR key more than one second. Enter INRUSH mode in automatic ACA modes will force the range be locked in manual range. To have the detail application circuit, please refer to application circuit. Any change of the component value may have influence on the INRUSH characteristic. So it's not recommended to have any change on these component value. For INRUSH function, an external true RMS-to-DC ES636 IC must be required. The flow chart of INRUSH function is shown below. Press KEY>1sec Normal State Press KEY Inrush Mode Inrush Mode Detected "Main-display: normal run" "Wait for signal" "Sub-display: INRUSH value" Press KEY<1sec
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ES51968(6600counts)
Dual Display/Inrush
4.8. ZERO function In manual DC 6.600A, 66.00A, 660.0A and 6600A, auto DC 66.00A/660.0A and auto DC 660.0A/6600A mesurement modes, ES51968 provides Zero function to remove the residual current value. Push ZERO bottom less than one second to enter Zero mode. In Zero mode, main-display shows DN+K - DN, where N = 1, 2, 3, ... , DN is the last conversion value before Zero is pushed, and DN+K is the current conversion value. Sub-display shows nothing if no other function is activated. If Zero is pushed again in Zero mode, main-display will update the DN value and displays the DN+K - DN again. The meter returns to normal operation if Zero is pressed and held for longer than one second. Pressing HOLD in Zero mode makes the meter stop updating the LCD panel. In 2-range auto DCA modes for clampmeter (660.0A/6600A or 66.00A/660.0A), the system will stay in automatic mode, even if the Zero function is activated. In other words, it could achieve real automatic operation. In automatic mode, Zero function could not be entered from higher range, but it could be still activated if current range is lower one. This is because most residual current value is so small that the range should stay at lower one in automatic mode. When enter Zero mode from lower range, the system will store the nonzero counts (residual current value). If the range goes up to higher one automatically, the non-zero counts will be divided by ten. So this function will still work well in automatic modes. State diagram for Zero mode: Original State Press Zero Press Zero > 1s `Zero' Active Main-display: DN+K - DN State diagram for Zero + HOLD mode: Original State Press Zero Press Zero > 1s `Zero' Active Main-display: DN+K - DN Press Hold `Zero' `Hold' Active LCD stops updating
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Press Zero < 1s
Press Zero < 1s
ES51968(6600counts)
Dual Display/Inrush
State diagram for Zero + Max/Min + HOLD mode: Original State Press Zero Press Zero > 1s `Zero' Active MD: DN+K - DN SD: No data Press Max/Min > 1s `Zero' `Min' Active MD: DN+K - DN SD: Min. DN+K - DN Value Press HOLD Press Zero < 1s
Press Max/Min
`Zero' `Max' Active MD: DN+K - DN SD: Max. DN+K - DN Value Press HOLD
Press Max/Min < 1s
`Zero' `Max' `Hold' Active SD: Max. DN+K - DN Value
`Zero' `Min' `Hold' Active SD: Min. DN+K - DN Value
Press Max/Min < 1s
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Dual Display/Inrush
5. Serial Data Output The RS232 function will be activated if the RS232 pin is pulled to and asserts at V-. The serial data sent to SDO pin once every A/D conversion cycle. The data format complies with JIS 7Bits transmission code with a baud rate of 19230. The host can use RS232 interface to read the data. A single data packet includes a start bit (always 0), 7 data bits, an odd parity check bit, and a stop bit (always 1). The high and low voltage levels correspond to DGND and V- respectively. SDO remains at 1 (high) when it is inactive. Hence the start bit (0) could be used as the triggering signal to begin the reading process. The following figure shows the data format of a single packet. The LSB is sent first and the MSB is sent last. single package
0V -3V
0
LSB
D0 ~D6
p P1
MSB
One data block consists of 17 packets, or 170 bits. The following figure shows the format of a data block. The M_range or S_range packet indicates the full-scale range of main measurement mode or sub-measurement mode. M_digit3 through M_digit0 are the conversion result of main measurement mode, and S_digit3 through S_digit0 are the conversion result of sub-measurement mode(Hz or duty). The function packet indicates the measurement mode of the meter. Status, option1, option2 and option3 give the status of the meter. CR and LF are delimiters used to separate the blocks. all package 0 M_range 0 M_digit1 0 S_digit1 0 Option1 0 LF
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10 S_range 10 M_digit0 10 S_digit0 10 Option2 1
10 M_digit3 10 S_digit3 10 Function 10 Option3
10 M_digit2 10 S_digit2 10 Status 10 CR
1
1
1
1
ES51968(6600counts)
Dual Display/Inrush
5.1. FUNCTUON This packet indicates the measurement mode of the meter. The following table summarizes the transmitted code for each mode. Note that the encoding of this packet is different from the encoding of FC1-FC5 switch.
Code 0111011 2 0111101 2 0111111 0110000 0111001 0110011 0110101 0110001 0110010 0110110 0110100 0111110
1
Measurement Mode Voltage Auto A Current Auto mA Current 66 A current Manual A Current Continuity Diode Frequency Capacitance 1 Temperature ADP
VBAR=0 Don't care Auto A Current Auto mA Current
VBAR=1 Auto 660.0A/6600A Auto 66.00A/660.0A
Don't care
When the function code = 0110100, the TF bit in the Status packet determines whether the unit is Celsius or When the function code = 0111101 or 0111111, the measurement mode is determined by VBAR bit of
Fahrenheit.
2
STATUS packet.
5.2. RANGE This packet indicates the full-scale range of the meter. When the meter operates in continuity mode or diode mode, this packet is always 0110000 since the full-scale ranges in these modes are fixed. The following table lists the code for each range in each measurement mode.
Code V *2-range auto A 66 A Manual A ADP 0110000 6.600V Lower Range(IVSL) 66.00 A 6.600A ADP3 660.0 0110001 66.00V Higher Range(IVSH) 66.00A ADP2 6.600K 0110010 660.0V 660.0A ADP1 66.00K 0110011 1000V 6600A ADP0 660.0K 0110100 660.0mV 6.600M 0110101 66.00M 0110110 0110111 *It includes auto 660.0/6000A, 66.00/660.0mA, 66.00A/660.0A, 660.0A/6000A. Frequency Capacitor 66.00Hz 6.600nF 660.0Hz 66.00nF 6.600KHz 660.0nF 66.00KHz 6.600F 660.0KHz 66.00F 6.600MHz 660.0F 66.00MHz 6.600mF 66.00mF
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ES51968(6600counts)
Dual Display/Inrush
5.3. Mdigit_3 - Mdigit_0 and Sdigit_3 - Sdigit_0 Mdigit_3 - Mdigit_0 is the measurement result of main measurement mode. This result is shown on main-display of LCD panel. Sdigit_3 - Sdigit_0 is the measurement result of sub-measurement mode, for example, frequency in AC voltage/current mode or duty cycle in frequency mode. This result will be shown on sub-display of LCD panel. Mdigit3 and Sdigit3 is the most significant digit, and Mdigit0 and Sdigit0 is the least significant digit.
Digit 0 1 2 3 4 5 6 7 8 9 Code 0110000 0110001 0110010 0110011 0110100 0110101 0110110 0110111 0111000 0111001
5.4. STATUS The format of this package is shown below. The TF field is meaningful only when the Function packet indicates Temperature mode. In Temperature mode, the TF is 1 if the unit is C and is 0 of the unit is F. BATT field is one when battery low condition is true. In ACA clamp mode, the Judge bit indicates the inrush key was pushed and the waiting state has been triggered. When Judge field is set to high(check the last one), the inrush value which is shown on sub-display will be Mdigit_3~Mdigit_0 of the same packet. The Judge bit is also available in duty cycle mode. If the Judge bit is 1, the final result should be calculated by (100-X) % which X is the output data from Sdigit_3~Sdigit0. If the Judge bit is 0, then the final data is X %. The VBAR will be 1 only when the VBAR pin is connected to V-.
0 BIT6 1 BIT 5 1 BIT 4 TF BIT 3 BATT BIT 2 Judge BIT1 VBAR BIT 0
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ES51968(6600counts)
Dual Display/Inrush
5.5. OPTION 1 DC field indicates that the meter operates in DC measurement mode, either voltage or current. AC field indicates that the meter operates in AC measurement mode, either voltage or current. AUTO field is set to 1 if the meter operates in automatic mode, and is set to 0 when the meter operates in manual mode. SIGN field indicates whether the minus sign of main measurement on the LCD panel is on or off.
0 BIT 6 1 BIT 5 1 BIT 4 DC BIT 3 AC BIT 2 AUTO BIT 1 SIGN BIT 0
5.6. OPTION 2
0 BIT 6 1 BIT 5 1 BIT 4 OLM BIT 3 OLS BIT 2 BIT1 BIT 0
OLM bit is 1 when the main measurement mode is over range. OLS bit is 1 when the sub-measurement mode (Hz or duty) is over range in voltage/current with frequency or frequency with duty cycle modes. 5.7. OPTION 3 VAHz bit is set to high when the sub-display is available for HZ mode of ACV/ACA. If MAX/MIN or REL key is pushed actively, the Hz mode will be inactive and the VAHz bit will be set to low.
0 BIT 6 1 BIT 5 1 BIT 4 BIT 3 BIT 2 BIT 1 VAHz BIT 0
5.8. CR Carriage return. The transmitted code is 0001101. 5.9. LF Line feed. The transmitted code is 0001010.
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ES51968(6600counts)
Dual Display/Inrush
6. Miscellaneous The conditions, which the meter turns on the buzzer, include: (1) Changing measurement mode generates one beep. (2) Pressing any of the push functions generates one beep, if the function is valid. (3) Power on and re-power on generate one beep. (4) Input overflow in voltage and current mode generates one beep every 0.3 seconds (or 3.33 beeps per second.) (5) Continuity(diode) check generates a continuous 2KHz beep whenever the measurement is less then 30(30mV) (6) Auto power off generates a 2KHz beep which lasts for 1.5 seconds. The following figures show the output waveform from the BUZOUT pin.
0.5 mS
(a) Continuous 2KHz beep
0.15 sec
0.3 sec
(b) 3.33 beep/sec
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ES51968(6600counts)
Dual Display/Inrush
6.1. LCD Panel S01 S02 S03
APO bar5 bar6 bar9 bar10
S04
AC bar7 bar8 bar11 bar12
S05
MINUS DC bar13 bar14 bar17 bar18
S06
4F 4E bar15 bar16 bar19 bar20
S07
4A 4G 4D bar21 bar22
S08
4B 4C DP3 bar23 bar24
S09
3F 3E bar25 bar26 bar27 bar28
S10
3A 3G 3D bar29 bar30
S11
3B 3C bar31 bar32 bar33 bar34
S12
2F 2E DP2 bar35 bar36
BP1 ADP0 ADP1 BP3 BP4
barbar1 bar2 bar0 bar3 bar4
BP2 ADP2 ADP3 RS232 LBAT
S13 BP1 BP2 BP3
2A 2G 2D bar37
S14
2B 2C bar39 bar40 bar41 bar42
S15
1F 1E DP2 bar43 bar44
S16
1A 1G 1D bar45 bar46
S17
1B 1C bar47 bar48 bar49 bar50
S18
S19
S20
V
S21
A F Hz bar57 bar58
S22
S23
S24
%
2
n M bar51 bar52
m2 1
K bar53 bar54
m1
bar55 bar56

bar59 bar60 bar63 bar64 bar61 bar62 bar65 bar66
K2 Hz2
BP4 bar38 S25 BP1 BP2 BP3 BP4
S1B S1G S1C S1D
S26
S1A S1F S1E SDP1
S27
S2B S2G S2C S2D
S28
S2A S2F S2E SDP2
S29
S3B S3G S3C S3D
S30
S3A S3F S3E SDP3
S31
S4B S4G S4C S4D
S32
S4A S4F
SMINUS
S33
S34
AUTO
S35
INRUSH
MAX MANU MIN HOLD ZERO REL
S4E
S35 S34
S33
S32
S31
S29 S30
S27 S28
S25 S26 S24
MAX MIN HOLD AUTO MANU ZERO REL INRUSH BP1 ADP0 APO AC ADP1 DC BP2 ADP2 LBAT ADP3 RS232 BP3 BP4
0 S01 S02 10 S03 S04 20 30 S11 S13 S12 40 50
% K2 Hz2
2 m2 V A n 1 m1 F M K Hz
66
60 S22 S23
S05 S07 S09 S06 S08 S10
S14 S16 S17 S19 S21 S15 S18 S20
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Dual Display/Inrush
LCD Backplane Waveform
V- +3.1 V- +3.1
V-
V-
V- +3.1 V- +3.1
V-
V-
V- +3.1 V- +3.1
VV- +3.1
VV- +3.1
V-
6.2. LCD display on condition
LCD Annunciator V A F % Hz ADP1 ADP2 ADP3 ADP4 DC AC AUTO MANU HOLD REL Max / Min ZERO INRUSH m1 Condition In voltage measurement mode, and diode measurement mode. In current measurement mode. In resistance measurement mode, and continuity mode. In capacitance measurement mode. In continuity check mode. In diode mode. In duty cycle measurement. In frequency mode. When ADP1 mode is active When ADP2 mode is active When ADP3 mode is active When ADP4 mode is active In DC voltage or DC current mode. In AC voltage or AC current mode. When automatic full scale range selection is enabled. In manual mode. When HOLD function is enabled. When Relative function is enabled. When Max/Min function is enabled. When ZERO function is enabled. When INRUSH function is enabled. In capacitor measurement mode and the full scale range is in the order of mF. In capacitor measurement mode and the full scale range is in the order of uF. In capacitor measurement mode and the full scale range is in the order of nF. In voltage or current measurement mode and the full scale range is in the order of 10-3. In current measurement mode and the full scale range id in the order of uA. In resistance measurement mode and the full scale range is in the order of M 29 09/04/14
1
n m2
2
M v2.5
ES51968(6600counts)
Dual Display/Inrush
K APO RS232 In resistance measurement mode and the full scale range is in the order of K In temperature measurement mode and when the unit is In temperature measurement mode and when the unit is When auto power off function is enabled. When RS232 output is enabled.
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Dual Display/Inrush
6.3. Operating Timing ES51968 incorporates a dual slope ADC with four phases: ZI, AZ, INT and DINT. The timing of each phase is listed below. The Bar-graph ADC is 10X faster than slow ADC. *Voltage / Ohm /ADP / Manual Current (for clampmeter) measurement: Phase ZI AZ INT DINT Lo-speed 60ms 24ms 100ms 166ms Hi-speed 6ms 2.4ms 10ms 16.6ms
*Current mode for multimeter / Current mode for clampmeter Phase ZI AZ INT DINT *Capacitance measurement: Range 6.600nF 66.00nF 660.0nF 6.600F 66.00F 660.0F 6.600mF 66.00mF Total Measurement Time 0.35sec 0.35sec 0.35sec 0.35sec 0.70sec 1.40sec 1.40sec(max) 7.0sec(max) Lo-speed 60ms 24ms 1000ms 166ms Hi-speed 6ms 2.4ms 100ms 16.6ms
*Frequency + Duty cycle mode measurement In range 66.00Hz~66MHz, the measurement cycle = 1.05 sec P.S. In the frequency measurement with auto mode, if the range is changed, the internal clock rate will increase ten times and the new measurement cycle becomes 1/10 times of the original cycle until the range is stable.
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Dual Display/Inrush
1
2
3
4
5
6
Metallized Polypropylene Film Capacitor : C17 Metallized Polyester Capacitor : C18 Polyester Capacitor : C14 , C16 Current measurement input terminals should be protected by voltage clamping devices.
Function Switch
Regulator DC3.3V VSW4 ZR 5 Power S witch 5.6V 10uF 0.1uF V + ZR 6 U1 V+ VVLBAT9 CC+ SDO SLADC FC1 FC2 FC3 FC4 FC5 CESEL LPFOFF VST APOSEL SHIFT OSC1 OSC2 BKOUT BUZOUT RS232 BKLIT ENIR M AX/MIN V+ 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 V+ DGND AGND AGND CH+ CHCIH BUFH CAZH CL+ CLCIL CAZL BUFL RAZ IVS H IVS L OVX OVH OVSG OR 1 VR 5 VR 4 VR 3 VR 2 TEST5 AC VL AC VH ADI ADO OHMC3 OHMC2 OHMC1 VR H VR VA+ VASGND C14 R8 470K C15 C22 C17 220nF 220nF R9 R10 R11 R12 470K 150K 100K 100K OVH OVSG 100 1K 10.01K 101K 1.111M TEST5 AC VL AC VH C13 SW13 AC RM VS 0-100pF 0-100pF Q2 C23 C19 47nF 220nF C9 VR 2 10K R19 27K C24 4.7uF + 470nF R21 56K VR VA+ VAR7 R14 R15 R16 R20 Detailed ADO 100nF 22nF 22nF C21 10nF SDO SLACDC FC1 FC2 FC3 FC4 FC5 CESEL LPFOFF VST APOSEL En_Shift LBAT9 + V+ VC8 470nF Y1 4M Hz BKOUT BUZOUT RS232 BKLIT Inrush M AX/MIN
uA
V-
D SW SPDT J6
SW1
SW2
uA
SW5
BKLIT
BKLIT
SW6
D
mA
R1
Inrush
Inrush
1
90
SW3 C5 C2 10uF + C6 SW10 R3 mA 0.1uF 7.5V uA
C1
MAX/M IN
SW7
MAX/M IN
128 127 126 125 124 123 122 121 120 119 118 117 116 115 114 113 112 111 110 109 108 107 106 105 104 103
uA / mA
R2
SW8
KEY
KEY
SW9 KEY REL RANGE HOLD LC DCAP ANNUC BP1 BP2 BP3 BP4 SEG01 SEG02 SEG03 SEG04 SEG05 SEG06 SEG07 SEG08 SEG09 SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 SEG16 SEG17 SEG18 SEG19 SEG20 SEG21 SEG22 SEG23 SEG24 SEG25 SEG26 SEG27 SEG28 102 KEY 101 REL_ZERO 100 RANGE HOLD 99 98 ANNUNC 97 BP1 96 BP2 95 BP3 94 BP4 93 SEG01 92 SEG02 91 SEG03 90 SEG04 89 SEG05 88 SEG06 87 SEG07 86 SEG08 85 SEG09 84 SEG10 83 SEG11 82 SEG12 81 SEG13 80 SEG14 79 SEG15 78 SEG16 77 SEG17 76 SEG18 75 SEG19 74 73 SEG20 SEG21 72 SEG22 71 SEG23 70 69 SEG24 68 SEG25 67 SEG26 66 SEG27 65 SEG28
9
REL_ZERO
REL_ZERO
SW19
RANGE
RANGE
SW20
HOLD C7 0.1uF V-
HOLD
0.9
SW11 R4 mA
SW14
V-
SLACDC
SLACDC
C
20A
1 J1 R5 Close to IC R6 Q1 R18 1.5K PTC C12 100 SW12 IVS H IVS L A
0.099
C18
SW15
C
FC5
FC5
SW16
FC4
FC4
Gnd 0.001
1 J5 C11 220pF
ES51968_QFP_128
SW17
FC3
FC3
SW18
SW22
FC1
FC1
VR 1 50K 180K
B 1 J2 R17
VIN
RMS Circuit
ADP VR1 CACA+ R9K R1K NC NC CSH+ CSHLPC1 LPC2 LPC3 LPFOUT SLEEP VBAR BUZIN FREQ NC SEG35 SEG34 SEG33 SEG32 SEG31 SEG30 SEG29
B
- VS
C3
10uF
C4
+ VS 10uF
( For IVS H/IVSL mode ) SW21 SW_RC
7. Application Circuit
VR 3
200 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
R/C/D/Cont
470nF
22nF
VBAR BUZIN FREQ
SEG35 SEG34 SEG33 SEG32 SEG31 SEG30 SEG29
ADP
J3 R25 10M
1
R13
100K
100pF
ADO C30 22uF C20 2.2nF C10 C16 +
S1
SW-SPDT
1 2 3 4 5 6 7 SLEEP
U2
ES636
Vin + VS En NC - VS NC CAV NC dB COMMON BUF out RL BUF in Iout
14 13 12 11 10 9 8
AC VH
C27
R23 10K Q5 BUZOUT A R22 10K
C26 + R24 BZ1 Buz zer Hi-impedance Buzz er Detailed 1K
1uF R26 9K
200 C29 C28 470pF LPF 3dBBW = 7.5KHz R27 200 Q6 2.2uF + R28 2.2K PTC 1 J4 Q4 Q3 Q7
VR 5
500K
FIN
C31
V-
Title
ES51968_RMS(ES636) Circuit(Inrush)
Size
Number
Date: File: 1 2 3 4
14-Apr-2009 F:\Protel file\KA026.ddb
Sheet of Drawn B y:
5
6
v2.5
B
+
Buzzer Circuit
VR 4
200
C25
2.2uF
+
( For AC V/ADP mode )
4.7uF
R29 10K
+ VS
- VS
R30
A
Revision
Ver:4
32
FC2
FC2
09/04/14
+
+
ES51968(6600counts)
Dual Display/Inrush
8. Package Information
8.1 128L QFP Outline drawing
8.2
Dimension parameters
v2.5
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