ES51986 6000 Count AUTO DMM . Features Description • 6000 count display ES51986 is an integrated analog-to-digital Converter(ADC) with 6000 counts LCD display ,automatic range selection, and 3V DC power supply. Automatic range selection is provided for voltage(AC/DC) measurement, resistor measurement, current measurement, capacitor measurement, frequency counter. Expensive and bulky mechanical range switches are not required. Other features include data holding, MAX and MIN holding, diode measurement, temperature measurement, continuity checking, low battery detection, auto- power off, re-power on, and RS232 data output. • Full automatic measurement *Voltage measurement *Current measurement *Resistor measurement • Capacitor measurement (Auto range: 6n to 6mF) (Taiwan patent no.: 453443) • 60MHz Frequency counter • Range change function • Data hold function Application • MAX/MIN function Digital Multimeter • Diode measurement • ADP mode with external reference voltage • Serial data output (RS232 format) • Auto power off (10 mins) and re-power on • Low battery detect (3V and 9V) • 3V DC power supply • Back light function 1 11/01/05 ES51986 6000 Count AUTO DMM Pin Assignment HOLD RANGE SLACDC KEY FC5 FC4 FC3 FC2 FC1 NC C+ CNC SDO LBAT9 VVDGND AGND AGND 100 NC V+ V+ NC CL+ CLCIL CAZL BUFL IVSH IVSL OVX OVH OVSG NC OR1 VR5 VR4 VR3 VR2 TEST5 ACVL ACVH NC ADI NC ADO NC VRH VR 90 80 1 10 70 20 30 60 40 50 MAXMIN BKOUT NC XTAL NC OSC1 OSC2 NC BUZOUT BUZIN NC ANNUNC BP1 BP2 BP3 BP4 SEG01 SEG02 SEG03 SEG04 SEG05 SEG06 SEG05 SEG07 SEG08 SEG09 SEG10 SEG11 SEG12 NC SEG13 SEG14 SEG15 SEG16 SEG17 BKLIT RS232 NC FREQ SLEEP CA+ CAR1K R9K VBAR NC VR1 SGND ADP VAVA+ 2 11/01/05 ES51986 6000 Count AUTO DMM 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 Symbol NC V+ V+ NC CL+ CLCIL CAZL BUFL IVSH IVSL OVX OVH OVSG NC OR1 VR5 VR4 VR3 VR2 TEST 5 ACVL ACVH NC ADI NC ADO NC VRH VR VA+ Type Description P P Positive supply voltage, output of on-chip DC-DC converter. Positive supply voltage, output of on-chip DC-DC converter. IO IO O O O I I I I I High resolution positive connection for reference capacitor. High resolution negative connection for reference capacitor. High resolution integrator output. Connected to integral capacitor High resolution auto-zero capacitor connection. Integral resistor connection for high resolution buffer output High current measurement input. Low current measurement input Input high voltage for resistance measurement Output connection for resistance measurement Sense low voltage for resistance measurement O O O O O I/O O O Reference resistor connection for 600.0Ω range Voltage measurement ÷10000 attenuator(6000V) Voltage measurement ÷1000 attenuator(600.0V) Voltage measurement ÷100 attenuator(60.00V) Voltage measurement ÷10 attenuator(6.000V) Test pin Negative output of AC to DC converter Positive output of AC to DC converter. I Negative input of internal AC to DC Opamp. O Output of internal AC to DC Opamp. O I I Output of band-gap voltage reference .Typically –1.2V Reference input voltage connection. Typically –100mV For ADP. Deintegrating voltage positive input. The input should be higher than VA-. For ADP. Deintegrating voltage negative input. The input should be lower than VA+. ADP input Signal Ground Measurement input 32 VA- 33 34 35 36 37 ADP SGND VR1 NC VBAR I G I 38 39 40 41 42 43 44 45 46 47~51 R9K R1K CACA+ SLEEP FREQ NC RS232 BKLIT O O IO IO O I In capacitance mode, a compensation capacitance is connected In temperature mode, it is used to control decimal point. See page 11 Connect to a 9KΩ resister for capacitor measurement. Connect to a 1KΩ resister for capacitor measurement. Negative auto-zero capacitor connection for capacitor measurement Positive auto-zero capacitor connection for capacitor measurement Asserts low in the sleep mode. See page 9, function description Frequency counter input, offset V-/2 internally by the chip. I I O Pulse low to enable serial data output. Back light function. Pulse low to set BKOUT pin output LCD segment line 17~13 SEG17~SEG13 I 3 11/01/05 ES51986 6000 Count AUTO DMM …continued from previous page NC 52 53~64 SEG12~SEG01 O 65 BP4 O 66 BP3 O 67 BP2 O 68 BP1 O 69 ANNUNC O 70 71 72 NC BUZIN BUZOUT 73 74 75 76 77 NC OSC2 OSC1 NC XTAL 78 79 LCD segment line 12~01 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 an LCD segment to ANNUNC to turn it on; connect an LCD segment to its backplane to turn it off. I O Enables the buzzer. Low active. Outputs an 2KHz audio frequency signal for driving piezoelectric buzzer when BUZIN is low. O I Crystal oscillator output connection Crystal oscillator input connection I NC BKOUT The chip uses internal RC oscillator if pin is connected to V-, and uses external crystal oscillator if this pin is floating or connected to DGND O 80 81 82 83 84 MAXMIN HOLD RANGE SLACDC KEY I I I I I 85 86 87 88 89 90 91 92 93 94 95 FC5 FC4 FC3 FC2 FC1 NC C+ CNC SDO LBAT9 I I I I I If BKLIT function is enabled, this pin will change from –3V to +3V for 60 sec, once press BKLIT pin again within 60 sec, this pin will change back to –3V. Max/Min input pin. Pulse to V- to enable function. Pulse low to enable HOLD mode. Pulse low to enable manual mode and manual range selection. Select AC/DC initial state. This pin is pull low. Please refer to page 10 Pulse low to change mode. In ADP mode, if this pin is connected to V-, the buzzer output will be off when the ADP input overflows. 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. O O Positive capacitor connection for on-chip DC-DC converter. Negative capacitor connection for on-chip DC-DC converter. O I 96 97 98 99 100 VVDGND AGND AGND RS232 compliant serial data output. Low battery configuration. If 3V battery is used, connect it to AGND. The default low-battery threshold voltage is –2.3V. If 9V battery is used, the low battery annunciator is displayed when the voltage of this pin is less than VRH (-1.2V) Negative supply voltage. Connecting to battery negative terminal. Negative supply voltage. Connecting to battery negative terminal. Digital ground, connected to battery positive terminal. Analog ground. Analog ground. P P G G G 4 11/01/05 ES51986 6000 Count AUTO DMM 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- = -3V Parameter Power supply Operating supply current In DCV mode Voltage roll-over error Voltage nonlinearity Input Leakage Low battery flag voltage Zero input reading Reference voltage and open circuit voltage for 600Ω measurement Peak to peak backplane drive voltage Counter time base period Open circuit voltage for Ω measurement (except 600Ω) Internal pull-high to 0V current Internal pull-low to Vcurrent AC frequency response at 6V range 6.000V range Symbol Test Condition VIDD Normal operation ISS In sleep mode REV 10MΩ input resistor NLV Best case straight line VREF V- to AGND 10MΩ input resistor 100KΩ resistor between VRH and AGND -3.5V≤ V ≤-2.2V fOSC = 4MHZ Ω and Continuity Mode Between V- pin and HOLD, RANGE, KEY, FC1, FC2, FC3, FC4, FC5, XTAL, BKLIT,MAXMIN Between V- pin and RS232 Between GND Pin and SLACDC ±1% ±5% 5 Min. -3.5 — — — Typ. -3.0 0.9 2.5 — Max -2.2 1.4 5 ±0.1 Units V mA µA %F.S — — ±0.1 %F.S -10 -2.5 -000 1 -2.3 000 10 -2.1 +000 PA V counts -1.3 -1.2 -1.1 V 2.90 3.1 3.3 V — 1 — sec -0.54 -0.47 -0.4 V — 1.2 — — 11 — 1.5 — — 40-400 40-2000 µA µA — — HZ 11/01/05 ES51986 6000 Count AUTO DMM Reference voltage temperature Coefficient TCRF 100KΩ resister Between VRH 0℃<TA<70℃ 6nF range Capacitance Measurement accuracy 60nF – 6µF 6µF~6mF — 50 — ppm/℃ -1.5 -2 — — 1.5 2 %F.S counts -0.8 -2 -1.1* -2 — — — — 0.8 2 1.1* 2 %F.S counts %F.S counts *The accuracy of 60uF range is 1.5% F.S Function Description 1. Operating Modes 1.1 Voltage Measurement A reconfigurable voltage divider automatically provides a suitable range in voltage measurement mode. The following table summarizes the full scale ranges in each configuration. Configuration VR1 VR2 VR3 VR3 VR5 1. 2. Full Scale Range 600.0mV 6.000V 60.00V 600.0V 6000V Divider Ratio 1 1/10 1/100 1/1000 1/10000 Resister Connection R2 / (R1+R2) R3 / (R1+R3) R4 / (R1+R4) R5 / (R1+R5) 600.0mV range only exist in manual mode. In the 6000V range, if the digit number is larger than 1000V, LCD will display “OL”. The measurement of true RMS using ES636 If ES636 (or other true RMS-to-DC converter chip) is used for true RMS measurement, the suggested application circuit is shown in Figure 1. When ES636 is used for true RMS, make ADO and ADI pin short, keep TEST5 pin float, and connect ACVL pin to SGND. And connect OVSG pin to AGND through a switch in ACV mode. 6 11/01/05 ES51986 6000 Count AUTO DMM 2.2u + -Vs ES636 4.7u 1 2 3 4 5 6 7 100 1K 10K 101K 1.111M +Vs 14 13 12 11 10 150 9 8 10K +Vs OVSG OR1 VR5 VR4 VR3 VR2 ES51986 ACV TEST5 ACVL ACVH 500K 2.2u + -Vs ADI ADO AGND 22k 1k Figure 1. Ture RMS measurement using ES636 1.2 Resistance Measurement A reconfigurable 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. Configuration OR1 OR2 OR3 OR4 OR5 OR6 Full Scale Range 600.0Ω 6.000KΩ 60.00KΩ 600.0KΩ 6.000MΩ 60.00MΩ Divider Ratio R6 R5 R4 R1‖ R3 R1‖ R2 R1 7 Resister Connection 100Ω 1KΩ 10KΩ 100KΩ 1MΩ 10MΩ 11/01/05 ES51986 6000 Count AUTO DMM 1.3 Current measurement Current measurement has three modes. The following table summarizes the full scale range of each mode. Mode Automatic Mode 1 Automatic Mode 2 Automatic Mode 3 Manual Mode Range Selection µA mA A A Full Scale 600.0µA / 6000µA 60.00mA / 600.0mA 60.00A / 6.000A 60.00A 1.4 Capacitance Measurement The following table summarizes the eight ranges of capacitance measurement mode. Configuration C1 C2 C3 C4 C5 C6 C7 Full Scale Range 6.000nF 60.00nF 600.0nF 6.000µF 60.00µF 600.0µF 6mF Resistance Ratio R1 R1‖ R2 R1‖ R3 R4 - 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 LCD displays DS.C 2. Discharging through the chip is quite slow. We recommend the user to discharge the capacitor with some other apparatus. 1.5 Continuity Check Continuity check shares the same configuration with 600.0Ω manual resistance measurement mode, but with buzzer output to indicate continuity. The buzzer generates a 2KHz sound whenever the digit number less than 25Ω. Because the cycle time of measurement is only 90ms, the least significant digit will not display. 1.6 Diode Measurement Diode measurement mode shares the same configuration with 6.000V manual voltage measurement mode. 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”. The buzzer generates a 2KHz sound whenever the digit number is less than 0.25V. Because the cycle time of measurement is only 90ms, the least significant digit will not display. 8 11/01/05 ES51986 6000 Count AUTO DMM 1.7 Frequency counter The time base of the frequency counter is derived from an external crystal oscillator by 4000000 Fosc Tcounter = 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 five decades, from 6KHz to 60MHz The following table summarizes the full scale range of the frequency counter. Range FR1 FR2 FR3 FR4 FR5 Full Scale 6.000KHz 60.00KHz 600.0KHz 6.000MHz 60.00MHz 1.8 Auto power off ES51986 has a default auto power off function. If the meter idles for more than 10 minutes, the chip automatically turns the power off. When this happens, the state of the meter is saved. In order to disable auto power off function, power on the meter when any of the push function, except for HOLD, is pressed down. In addition, when RS232 output is active, the auto power-off function is also disabled. The APO sign on the LCD panel indicates whether the auto power-off is enabled or not. Note: Powering on the meter while pressing HOLD turns on all LCD segment until HOLD is pressed again. 1.9 Sleep The meter enters sleep mode after auto power off. The SLEEP pin asserts low (-3V) in the sleep mode, and asserts high (+3V, not 0V) after re-power on. 1.10 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. 9 11/01/05 ES51986 6000 Count AUTO DMM 2. Measurement Mode Switching Measurement mode depends on the logic level of FC1, FC2, FC3, FC4, FC5, and KEY. When FC5 is HIGH, the measurement modes are listed in the following table. SLACDC FC1 0 1 0 1 0 1 0 1 0 0 1 1 1 1 1 1 1 1 1 0 X 0 X 0 X 0 X 0 X 0 X 0 X 0 FC2 0 1 1 0 0 0 1 1 0 0 0 1 0 1 0 1 1 FC3 1 0 1 0 0 1 0 1 0 0 1 0 0 1 1 1 0 FC4 1 1 1 1 0 1 1 1 1 0 1 1 1 1 0 0 0 Mode Function of KEY Voltage Measurement DCV(initial) ↔ACV Current Measurement(µA) DCA(initial) ↔ACA Current Measurement(mA) DCA(initial) ↔ ACA Manual Current Measurement(A) DCA (initial) ↔ACA Auto Current Measurement(A) DCA (initial) Voltage Measurement ACV (initial) ↔DCV Current Measurement(µA) ACuA(initial) ↔DCuA Current Measurement(mA) ACmA (initial) ↔DCmA Manual Current Measurement(A) ACA (initial) ↔DCA Auto Current Measurement(A) ACA (initial) Resistance Measurement Ω ↔ Continuity Resistance Measurement Ω ↔ Diode Continuity Check Continuity Diode Resistance Measurement Ω ↔ Continuity ↔Diode Frequency Measurement — Capacitance Measurement — — Temperature(℃) Ps. X means “don’t care” When FC5 is LOW, KEY is disable. The corresponding measurement modes are list below SLACDC FC1 0 1 0 1 0 1 0 1 0 0 1 1 1 1 1 1 1 1 1 0 X 0 X 0 X 0 X 0 X 0 X 0 X 0 FC2 0 1 1 0 0 0 1 1 0 0 0 1 0 1 0 1 1 FC3 1 0 1 0 0 1 0 1 0 0 1 0 0 1 1 1 0 FC4 1 1 1 1 0 1 1 1 1 0 1 1 1 1 0 0 0 Mode AC Voltage Measurement AC Current Measurement(µA) AC Current Measurement(mA) Manual AC Current Measurement(A) Auto AC Current Measurement(A) DC Voltage Measurement DC Current Measurement(µA) DC Current Measurement(mA) Manual DC Current Measurement(A) Auto DC Current Measurement(A) Resistance Measurement Resistance Measurement Continuity Check Diode Measurement Frequency Measurement Capacitance Measurement Temperature(℉) Ps. X means “don’t care” 10 11/01/05 ES51986 6000 Count AUTO DMM 1.SLACDC pin is used to set initial mode (AC or DC) for voltage and current measurement. Using SLACDC pin to switch AC or DC will not reset enabled functions like max/min, manual/auto range….etc. If you want to have reset function during the change between AC and DC, please use FC1~FC5 and KEY. The other combinations of FC1, FC2, FC3, and FC4 are for ADP modes. In ADP modes , if FC5 is LOW, the minus sign on the LCD panel will not be displayed. And if KEY pin is floating, the buzzer beeps when the input signal is overflow. The ADP mode function is summarized below. FC1 1 1 1 1 FC2 1 1 0 0 FC3 1 0 0 1 FC4 0 0 0 0 Mode ADP0 ADP1 ADP2 ADP3 Note: Temperature measurement mode takes input signal from ADP pin. In temperature measurement mode, VBAR pin is used to control the right most digit point on the LCD panel. When VBAR is LOW, this digit point is displayed. 3. Push function 3.1 HOLD 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. HOLD function can be cancelled by changing the measurement mode, pressing RANGE, or push HOLD again. 3.2 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. Automatic Mode 1 push < 1 sec Manual Mode 1 push > 1 sec Range up 1 push < 1 sec 11 11/01/05 ES51986 6000 Count AUTO DMM Measurement Mode Auto Manual V(DC/AC) VR2 – VR5 VRi → VRi + 1, VR5 → VR1 µA(DC/AC) R1 – R2 R1 → R2, R2 → R1 mA R1－R2 R1 → R2 (AC/DC) R2 → R1 Auto A(DC/AC) R1 – R2 R1 → R2, R2 → R1 Manual A(DC/AC) fixed fixed ORi → Ω OR1- OR6 ORi + 1, OR6 → OR1 Capacitor C1-C7 Ci → Ci+1, C7 → C1 Continuity fixed fixed Diode fixed fixed Frequency FR1 – FR5 FRi→ FRi+1 FR5→ FR1 Control Range Initial Range 600.0mV – 6000V 6.000V 600.0µA - 6000µA 600.0µA 60.00mA – 600.0mA 60.00mA 6.000A – 60.00A 6.000A 60.00A 60.00A 600.0Ω – 60.00MΩ 600.0Ω 6.000nF – 6.000mF 6.000nF 600.0Ω 6.000V 6.000KHz – 60.00MHz 600.0Ω 6.000V 6.000KHz Note: Pushing RANGE resets all existing special modes. 3.3 KEY See Section “Measurement Mode Switching” for the function of this pin. 3.4 Max/Min + HOLD Original state (Automatic/manual) 1 push<1 sec 1 push>1 sec 1 push>1 sec “MAX” active max value 1 push<1 sec Push HOLD “MAX”&”H” active held max value. “MIN” active min value Push HOLD 1 push<1 sec 12 “MIN”&”H” active held min value. 11/01/05 ES51986 6000 Count AUTO DMM The meter displays the maximum or minimum value of the input in MAX/MIN mode. When MAX/MIN is pressed for the first time, the meter displays the maximum value. When MAX/MIN is pressed again, the meter displays the minimum value. When MAX/MIN is pressed for the third time, the meter displays max value. 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. 4. Serial Data Output The serial data sent to SDO pin twice 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 D0 ~D6 LSB p 1 P MSB One data block consists of 11 packets, or 110 bits. The following figure shows the format of a data block. The range packet indicates the full scale range of the meter. Digit 3 through digit 0 are just the digits on the LCD panel. The function packet indicates the measurement mode of the meter. Status, option 1 and option 2 give the status of the meter. CR and LF are delimiters used to separate the blocks. 13 11/01/05 ES51986 6000 Count AUTO DMM all package range digit3 digit1 digit0 CR p 1 option2 p 1 p 1 0 0 function option1 status p 1 p 1 0 p 1 0 0 digit2 p 1 0 p 1 0 0 p 1 p 1 0 p 1 0 0 LF The meter always outputs the current input value to the serial port in spite of HOLD mode. Each block is repeated twice in one conversion cycle. The detailed data format of each packet is listed below. 4.1 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-FC4 switch. Code 0111011 0111101 0111111 0110000 0111001 0110011 0110101 0110001 0110010 0110110 0110100 0111110 0111100 0111000 0111010 Measurement Mode Voltage µA Current mA Current Auto A current Manual A Current Ω Continuity Diode Frequency Capacitor 1*Temperature ADP0 ADP1 ADP2 ADP3 Note: 1*.The judge bit in the Status packet determines whether the unit is Celcius or Fahrenheit. 14 11/01/05 ES51986 6000 Count AUTO DMM 4.2 RANGE This packet indicates the full scale range of the meter. When the meter operates in continuity mode, diode mode, or current (A) mode, this packet is always 0110000 since the full scale range in these modes are fixed. The following table lists the code for each range in each measurement mode. Code 0110000 0110001 0110010 0110011 0110100 0110101 0110110 V 6.000V 60.00V 600.0V 6000V 600.0mV mA 60.00mA 600.0mA µA 600.0µA 6000µA Auto A 6.000 A 60.00 A Frequency Ω 600.0Ω 6.000KHz 6.000KΩ 60.00KHz 60.00KΩ 600.0KHz 600.0KΩ 6.000MHz 6.000MΩ 60.00MHz 60.00MΩ Capacitor 6.000nF 60.00nF 600.0nF 6.000µF 60.00µF 600.0µF 6.000mF 4.3 DIGIT 3 – DIGIT 0 Digit 3 is the most significant digit on the LCD panel, and digit 0 is the least significant digit. When the LCD panel shows OL, the serial port outputs 6000. Digit 0 1 2 3 4 5 6 7 8 9 Code 0110000 0110001 0110010 0110011 0110100 0110101 0110110 0110111 0111000 0111001 Because the cyle time of measurement for continuity/diode mode is only 90ms, the least significant digit may not be accurate 4.4 STATUS The format of this shown below. The Judge field is meaningful only when the Function packet indicates Temperature mode. In Temperature mode, judge is 1 if the unit is ℃ and is 0 of the unit is ℉ . Sign field indicates whether the minus sign on the LCD panel is on or off. BATT field is one of battery low condition is true. OL indicates input overflow. 0 1 BIT 5 1 BIT 4 Judge BIT 3 15 Sign BIT 2 BATT BIT1 OL BIT 0 11/01/05 ES51986 6000 Count AUTO DMM 4.5 OPTION 1 This packet is not used. 0 BIT 6 1 BIT 5 1 BIT 4 HOLD BIT 3 MAX BIT 2 MIN BIT1 0 BIT 0 If Hold field is 1, Hold function is active. Hold function will not influence Digital 3~0 which is related to current measured value. If MAX field is 1, MAX/MIN is active and LCD panel display max value. If MIN field is 1, MAX/MIN is active and LCD panel display min value. 4.6 OPTION 2 This packet contains information on the operation mode of the meter. The format is shown below. The DC field indicates that the meter operates in DC measurement mode, either voltage or current. The AC field indicates that the meter operates in AC measurement mode, either voltage or current. The AUTO field is set to one if the meter operates in automatic mode, and is set to zero when the meter operates in manual mode. 0 BIT 6 1 BIT 5 1 BIT 4 DC BIT 3 AC BIT 2 AUTO BIT1 0 BIT 0 4.7 CR Carrage return. The transmitted code is 0001101. 4.8 LF Line feed. The transmitted code is 0001010. 5. Miscellaneous The conditions on which the meter turn on the buzzer include: (1) Changing measurement mode generates one beep. (2) Pressing any of the push junctions 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 25Ω(0.25V) (6) Auto power off generates a 2KHz beep which lasts for 1.5 seconds. 16 11/01/05 ES51986 6000 Count AUTO DMM The following figures shows 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 1 BATT AUTO MANU DC AC Max Min ℃ ℉ n µ1 m1 F HOLD µ2 m2 V A APO M KΩ HZ RS232 5.1 LCD Panel SEG01 SEG02 BP1 LBATT DC BP2 AC F4 BP3 APO — BP4 RS232 E4 SEG09 SEG10 F1 E1 DP1 A1 G1 D1 SEG11 V B1 C1 K SEG03 SEG04 SEG05 AUTO MANU A3 A4 B4 F3 G4 C4 E3 D4 DP3 D3 SEG06 B3 G3 C3 DP2 SEG07 HOLD F2 E2 D2 SEG08 A2 B2 G2 C2 SEG12 A M Hz Ω SEG15 u2 × × × SEG16 n u1 m1 F SEG17 ℃ ℉ × × SEG13 MIN MAX 17 SEG14 m2 × × × 11/01/05 ES51986 6000 Count AUTO DMM 5.1 LCD Backplane Waveform V- +3.1 VV- +3.1 VV- +3.1 VV- +3.1 VV- +3.1 V- 5.2 LCD display on condition LCD Annunciator V A Ω F Hz DC AC AUTO MANU HOLD m1 u1 n m2 u2 M K ℃ ℉ APO - 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 frequency mode. 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. 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 MΩ In resistance measurement mode and the full scale range is in the order of KΩ 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. In voltage or current measurement mode and when the input is negative. 18 11/01/05 ES51986 6000 Count AUTO DMM 5.3 Operating Timing ES51986 incorporates a dual slope ADC with four phases: ZI, AZ, INT and DINT. The timing of each phase of the two parts are listed below. *Voltage /ohm /ADP measurement: Phase ZI AZ INT DINT Time 100ms 100ms 100ms 600ms Ps. In the voltage and ohm 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. *Current mode Phase ZI AZ INT DINT Time 100ms 100ms 100ms 300ms *Continuity/diode measurement Phase ZI AZ INT DINT Time 10ms 10ms 10ms 60ms *Capacitance measurement: Range 6.000nF 60.00nF 600.0nF 6.000uF 60.00uF 600.0uF 6.000mF Total Measurement Time 0.9sec 0.9sec 0.9sec 0.9sec 0.9sec 1.8sec 4.5sec 19 11/01/05 ES51986 6000 Count AUTO DMM *.Frequency measurement one measurement cycle = 1.05 sec ps. 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. 20 11/01/05 ES51986 6000 Count AUTO DMM 6. Test circuit 1. Voltage test 4.Current test AGND OVSG 100 1K 10K 101K 1.11M D2 D1 1.0u 0.47u 1.0u OR1 VR5 VR4 VR3 VR2 ADO 88M ADI ACVL ACVH TEST5 0.1u 30K 20K 30K 10K 0.005 60A 0.045 0.45 6A mA 4.5 A mA uA V R 1 mA 45 100K uA uA IVSL 450 5.Frequency test -100mV F R E Q Voltage input 2.Resistor test 200 OVH OVSG 6.ADP test OR1 VR5 VR4 VR3 VR2 VA+ ADPin+ SGND AGND VAADP -100mV 100K ADPin- SGND AGND 3.Diode test AGND Z1 6V Z2 V- Fin 100 100 1K 10K 101K 1.11M 2.2u PTC 1.5K OVX PTC 1.5K IVSH 100K V R 10M Z1 6V Z2 AGND SGND 100 7. Low battery OVH PTC 1.5K 9V 10M 1.11M VR1 BA 680K TT VR2 270K LBAT9 0.1u AGND V- 0V OVSG 21 11/01/05 ES51986 6000 Count AUTO DMM 7. Application circuit 7.5V 5.6V ZI 0.1u + mA 450 uA 10u + 0.1u -3V 0.1u HOLD RANGE SLACDC KEY FC5 FC4 FC3 FC2 FC1 NC C+ CNC SDO LBAT9 VVDGND AGND AGND uA 4.7u 3V uA C 1.5K PTC 1815 -3V Note: In order to prevent IC from damaging by inappropriate operation, the Zener diodes MUST be required as protection. 22 11/01/05 -3V Display 1K 100K 1u 200 2.2u 9K Cp 10M 100K 470n 4MHz LCD 20K (50)SEG14 SEG15 SEG16 SEG17 BKLIT RS232 NC FREQ SLEEP CA+ (40)CAR1K R9K VBAR NC VR1 SGND ADP VAVA+ + -3V … MAX BKOUT NC XTAL NC OSC1 OSC2 NC BUZOUT BUZIN NC ANNUNC BP1 BP2 BP3 BP4 SEG01 SEG02 SEG03 SEG04 SEG05 SEG06 SEG07 SEG08 SEG09 SEG10 SEG11 SEG12 NC SEG13 NC 45 V+ V+ 4.5 mA NC mA CL+ 0.1u CL0.45 6A 0.22u A CIL 0.1u CAZL 0.045 60A 200K BUFL 0.005 SGND 100K IVSH(10) IVSL 100K OVX 100 100K 110pF OVH 1.5K OVSG PTC NC 100 OR1 1K Zener 6V VR5 10K C R 101K VR4 VR3 1.11M VR2(20) 10K TEST5 ACVL 10K ACVH NC 15K 15K 0.1u ADI 1u 1u NC 88M D1 D2 0.47u ADO NC 91K VRH 1u VR(30) ES51986 6000 Count AUTO DMM Package 1 100 Pin QFP Package 2 Dimension Paramenters 23 11/01/05