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| ver. 1.2 10/05/27 1 ES51931 22,000 counts auto dmm features ? 22,000 counts lcd driver with 46-segment bargraph display ? conversion rate : 2 times/s ? full automatic measurement *voltage measurement: manual 220.00mv / auto 2.2000v ? 1000.0v / auto 220.00 ? 1000.0v *current measurement: a/ma/a *resistance measurement: 220.00 ? ? 220.00m ? *capacitance measurement: 22.000nf ? 220.00mf(25sec) ( taiwan patent no.: 323347, 453443 ) *frequency counter 22.00hz ? 220.00mhz ? current modes for clamp meter ? duty cycle measurement (5.0% ~ 94.9%) ? diode measurement ? continuity check ? adp mode with independent reference voltage ? temperature mode with in ternal scale translation circuit from o c to o f ? push functions *range change function *vahz function *relative function *zero function in manual dca mode * data hold function with delay hold feature *max/min function *back-light function *key function ? programmable lcd segment display ? support a selectable low pass filter 3db bandwidth for acv & aca measurement ( taiwan patent no.: 362409 ) ( china patent no.: 1363073 ) ? shift function ? high-crest-factor signal detection ( taiwan patent no.: 234661 ) ? band-gap reference voltage output ? ce selection (610v, 1010v or 1500v) ? serial data output (rs232 format) ? lcd segment check when power on ? auto power off with idle time selection ? sleep output ? re-power on ? on-chip buzzer driver ? 3v dc power supply ? low battery detection for 3v or 9v battery description ES51931 is an integrated analog - to - digital converter (adc) with 22,000 counts lcd display, automatic rang e selection, and 3v dc power supply. automatic range selection is provided for voltage (a c/dc) measurement, resistance measurement, current measurement, capacitance measurement, and frequency counter. expensive and bulky mechanical range switches are not required. other features include rel/zero function, data holding, maximum and mini mum holding, diode measurement, temperature measurement, continuity checking, lo w battery detection, auto power off, re-power on, and rs232 data output.
ver. 1.2 10/05/27 2 ES51931 22,000 counts auto dmm application digital multimeter clamp meter thermometer pin assignment lqfp-128l 1 2 34 a b c d 4 3 2 1 d c b a v+ 1 cl+ 11 v+ 2 dgnd 3 agnd 4 agnd 5 ch+ 6 ch- 7 cih 8 buffh 9 cazh 10 cl- 12 cil 13 cazl 14 bufl 15 raz 16 ivsh 17 ivsl 18 ovx 19 ovh 20 ovsg 21 or1 22 vr5 23 vr3 25 vr2 26 test5 27 acvl 28 vr4 24 acvh 29 adi 30 ado 31 ohmc4 32 ohmc3 33 ohmc2 34 nc 36 ohmc1 35 vrh 37 vr 38 sgnd 39 adp 40 va+ 41 va- 42 v220m 43 vr1 44 vbar 45 ca- 46 ca+ 47 r9k 48 r1k 49 nc 50 nc 51 lpfc1 52 lpfc2 53 lpfout 54 lpfc3 55 buzi n 56 sleep 57 freq 58 seg31 59 nc 60 seg30 61 seg29 62 seg28 63 seg27 64 seg26 65 seg25 66 seg24 67 seg23 68 seg22 69 seg21 70 seg20 71 seg19 72 seg18 73 seg17 74 seg16 75 seg15 76 seg14 77 seg13 78 seg12 79 seg11 80 seg10 81 seg09 82 seg08 83 seg07 84 seg06 85 seg05 86 seg04 87 seg03 88 seg02 89 seg01 90 bp4 91 bp3 92 bp2 93 bp1 94 annunc 95 hold 96 range 97 rel_zero 98 key 99 max/min 100 nc 101 bklit 102 vahz 103 buzout 104 bkout 105 osc2 106 osc1 107 sclk 108 sdata 109 uplcd 110 rs232 111 aposel 112 bksel 113 vst 114 shi ft 115 cesel 116 slacdc 117 fc5 118 fc4 119 fc3 120 fc2 121 fc1 122 sdo 123 c+ 124 c- 125 v- 126 v- 127 lbat9 128 ES51931 ver. 1.2 10/05/27 3 ES51931 22,000 counts auto dmm pin description pin no symbol type description 1 v+ o output of on-chip dc-dc converter. 2 v+ o output of on-chip dc-dc converter. 3 dgnd p/g digital ground. connecting to 3v battery positive terminal. 4 agnd p/g analog ground. 5 agnd p/g analog ground. 6 ch+ io positive connection for refere nce capacitor of high-speed a/d. 7 ch- io negative connection for reference capacitor of high-speed a/d. 8 cih o high-speed integrator output. connect to integral capacitor. 9 buffh o high-speed buffer output pin. connect to integral resistor. 10 cazh o high-speed auto-zero capacitor connection. 11 cl+ io positive connection for refere nce capacitor of high-resolution a/d. 12 cl- io negative connection for reference capacitor of high- resolution a/d. 13 cil o high-resolution integrator output. connect to integral capacitor. 14 cazl o high-resolution auto-zero capacitor connection. 15 buffl o high-resolution buffer output pin. connect to integral resistor 16 raz o buffer output pin in az and zi phase. 17 ivsh i current measurement input for 2200 a, 220ma and 22a modes. 18 ivsl i current measurement input for 220 a, 22ma. 19 ovx i input high voltage for resistance measurement 20 ovh i output connection for resistance measurement 21 ovsg o sense low voltage for resistance measurement 22 or1 o reference resistor connection for 220.00 ? range 23 vr5 o voltage measurement 10000 attenuator(1000.0v) 24 vr4 o voltage measurement 1000 attenuator(220.00v) 25 vr3 o voltage measurement 100 attenuator(22.000v) 26 vr2 o voltage measurement 10 attenuator(2.2000v) 27 test5 io test pin 28 acvl o dc signal low input in acv/ aca mode. connect to negative output of external ac to dc converter. 29 acvh o dc signal high input in acv/aca mode. connect to positive output of external ac to dc converter. 30 adi i negative input of internal ac to dc op amp. 31 ado o output of internal ac to dc op amp. 32 ohmc1 o filter capacitor connection for resistance mode. 33 ohmc2 o filter capacitor connection for resistance mode. 34 ohmc3 o filter capacitor connection for resistance mode. 35 ohmc4 o filter capacitor connection for resistance mode. 36 nc - 37 vrh o output of band-gap voltage reference. typically ?1.23v 38 vr i reference input voltage connection. typically ?100mv 39 sgnd g signal ground. 40 adp i measurement input in adp m ode. connect to agnd if no used. 41 va+ i for adp mode. de-integrating voltage positive input. the input should be higher than va-. 42 va- i for adp mode. de-integrating voltage negative input. the input should be lower than va+. 43 v220m i independent input terminal for ac/dc 220.00mv mode. 44 vr1 i measurement input. 45 vbar i in temperature mode, it is used to control decimal point. in a or ma modes, it is used to control the ?? or ?m? sign. 46 ca- io negative auto-zero capacitor connection for capacitor measurement ver. 1.2 10/05/27 4 ES51931 22,000 counts auto dmm 47 ca+ io positive auto-zero capacitor connection for capacitor measurement 48 r9k o connect to a precise 9k ? resister for capacitor measurement. 49 r1k o connect to a precise 1k ? resister for capacitor measurement. 50 nc - 51 nc - 52 lpfc1 o capacitor c1 connection for internal low-pass filter 53 lpfc2 o capacitor c2 connection for internal low-pass filter 54 lpfout o capacitor c1 connection for internal low-pass filter 55 lpfc3 i capacitor c3 connection for internal low-pass filter 56 buzin i pull to v- to enable the buzout. 57 sleep o sleep mode indicator, asserts low in sleep mode. 58 freq i frequency counter input, offset v-/2 internally by the chip. 59 - 90 seg31 ? seg01 o lcd segment line 01 ? 31 91 bp4 o lcd backplane 4 92 bp3 o lcd backplane 3 93 bp2 o lcd backplane 2 94 bp1 o lcd backplane 1 95 annunc o 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. 96 hold i pulse to v- to enable hold function. 97 range i pulse to v- to enable manual mode and manual range selection. 98 rel_zero i pulse to v- to enable relative function or zero function. 99 key i 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. 100 max/min i pulse to v- to enable max/min function. 101 nc - 102 bklit i back light function. pulse low to set bkout pin output. 103 vahz i pulse to v- to enable vahz mode. 104 buzout o outputs a 2khz audio frequency signal for driving piezoelectric buzzer when buzin is low. 105 bkout o 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. 106 osc2 o crystal oscillator output connection 107 osc1 i crystal oscillator input connection 108 sclk i clock signal input for programmable lcd segment display. 109 sdata i serial data input pin for programmable lcd segment display. 110 plcd i enable pin for programmable lcd segment display and sdo output enable 111 rs232 i assert low to enable serial data output. 112 aposel i idle time selection for auto power off feature. 113 bksel i set to v- to change the backlight idle time from 60 sec. to 180 sec. 114 vst i set to v- to enable the auto range voltage mode to start from 220.00v range. 115 shift i assert low to enable lc d shift future, only works in 220m ? , and all capacitor measurement ranges 116 cesel i ol selection feature control pin of voltage mode. 117 slacdc i select initial state. 118 fc5 i switch 5 for function selection. 119 fc4 i switch 4 for function selection. 120 fc3 i switch 3 for function selection. 121 fc2 i switch 2 for function selection. 122 fc1 i switch 1 for function selection. ver. 1.2 10/05/27 5 ES51931 22,000 counts auto dmm 123 sdo o rs232 compliant serial data output. 124 c+ o positive capacitor connec tion for on-chip dc-dc converter. 125 c- o negative capacitor connection for on-chip dc-dc converter. 126 v- p negative supply voltage. connecting to 3v battery negative terminal. 127 v- p negative supply voltage. connecting to 3v battery negative terminal. 128 lbat9 i low battery configuration. if 3v battery is used, connect it to agnd. the default low-battery threshold volta ge 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) absolute maximum ratings characteristic rating supply voltage ( v - to agnd) -4v a nalog input voltage v- -0.6 to v+ +0.6 v + v+ (agnd/dgnd+0.5v) a gnd/dgnd agnd/dgnd (v- -0.5v) d igital inpu t v- -0.6 to dgnd +0.6 p ower dissipation. flat package 500mw operating temperature 0 to 70 storage temperature -25 to 125 electrical characteristics ta=25 , v- = -3v parameter symbol test condition min. typ. max units power supply v- -3.5 -3.0 -2.5 v i dd normal operation 2.0 2.5 ma operating supply current in dcv mode i ss in sleep mode 2.5 5 a voltage roll-over error rev 10m ? input resistor 0.03 %f.s 1 voltage nonlinearity nlv best case straight line 0.03 %f.s input leakage -10 1 10 pa low battery flag voltage v- to agnd -2.5 -2.3 -2.1 v zero input reading 10m ? input resistor -000 000 +000 counts band-gap reference voltage v ref 100k ? resistor between vrh and agnd -1.3 -1.2 -1.1 v peak to peak backplane drive voltage -3.5v v -2.2v 3.0 3.1 3.2 v counter time base period f osc = 4mhz 1 sec between v- pin and hold, range, key, fc1, fc2, fc3, fc4, fc5, bklit,maxmin 1.2 internal pull-high to 0v current between v- pin and rs232 11 a open circuit voltage for 220 measurement 220 mode -3.0 v ver. 1.2 10/05/27 6 ES51931 22,000 counts auto dmm open circuit voltage for measurement (except 220 ) and continuity mode -0.58 -0.53 -0.48 v internal pull-low to v- current between gnd pi n and slacdc 1.5 a 1% 40-400 ac frequency response at 2.2000v range 5% 400-2000 hz 3db=full (adp) 100 khz 3db=10k (adp) 10 khz 3db frequency for lpf mode f 3db 3db=1k (adp) 1 khz reference voltage temperature coefficient tc rf 100k ? resister between vrh 0 ver. 1.2 10/05/27 8 ES51931 22,000 counts auto dmm 1.1.5 low-pass filter feature ES51931 provides a 3-order low-pass filter to reduce the influence of high frequency noise. this lpf feature is available in ac v or aca modes. set fc5 to low in these modes, the key button is used to activate the lpf feature. press key button for less than 1 second to select the 3db bandwidth of lpf sequentially (full/10khz/1khz) and the relative lcd segment on lcd panel will be active also. 1.2 resistance measurement a re-configurable divider automatically provide s a suitable full-scale range in resistance measurement mode. the following table summarizes the full-scale ranges and the reference resistors in ea ch configuration. in 220.00m ? , if shift pin connects to v-, the least digit will not be displayed and the other digits and decimal point will shift right away. so the full scale becomes 220.0m ? instead of 220.00m? . configuration full scale range divider ratio resister connection or1 220.00 ? r6 100 ? or2 2.2000k ? r5 1k ? or3 22.000k ? r1 r4 10k ? or4 220.00k ? r1 r3 100k ? or5 2.2000m ? r1 r2 1m ? or6 22.000m ? r1 10m ? or7 220.00m ? r1 10m ? 1.3 current measurement for multimeter ES51931 has 2 automatic and 1 manual curren t measurement modes for multimeter. the following table summarizes the full-s cale range of each mode. when ES51931 operates in the current measurement modes fo r multimeter, it takes high input from pin ivsh or ivsl, low input from pin s gnd and reference voltage from pin vr. mode fc1~4 vbar full scale input terminal automatic1 1,1,0,1 1 220.00a / 2200.0a ivsl/ivsh v.s. sgnd automatic2 1,1,1,1 1 22.000ma / 220.00ma ivsl/ivsh v.s. sgnd manual 0,0,0,0 x 22.000a ivsh v.s. sgnd note: 1. the typical connection of input terminal is as the schematic below: vin * ivsl ivsh 100 k 9 r 100 k r ver. 1.2 10/05/27 9 ES51931 22,000 counts auto dmm 1.4 current measurement for clampmeter ES51931 has 2 automatic and 4 manual current measurement modes for clampmeter. the following table summarizes the full-s cale range of each mode. when ES51931 operate in the automatic mode1&2, it ta kes high input from ivsh/ivsl (higher range/lower range), low input from sg nd and reference voltage from vr. when ES51931 operates in the manual mode1~4, it takes high input from adp, low input from sgnd and reference voltage from va+ and va-. mode fc1~4 vbar full scale input terminal automatic1 1,1,0,1 0 220.00a / 2200.0a ivsl/ivsh v.s. sgnd automatic2 1,1,1,1 0 22.000a / 220.00a ivsl/ivsh v.s. sgnd manual1 1,1,0,0 x 22.000a adp v.s. sgnd manual2 1,0,0,0 x 220.00a adp v.s. sgnd manual3 1,0,1,0 x 2200.0a adp v.s. sgnd manual4 1,0,0,1 x 22000a adp v.s. sgnd note: 1. connect vbar to v- will disable the ? 2 ? / ?m 2 ? symbol on lcd panel. 2. in dc current modes for clampmeter, ES51931 provides zero function for offset removing. 3. the typical connection of input terminal for automatic1&2 is as the schematic below: ivsl ivsh vin * 9 r r r l ver. 1.2 10/05/27 10 ES51931 22,000 counts auto dmm 1.5 capacitance measurement the following table summarizes the eight ranges of capacitance measurement mode. configuration full scale range resistance ratio c1 22.000nf - c2 220.00nf vr 4 c3 2.2000uf 10k c4 22.000uf r9k/r1k c5 220.00uf r9k/r1k c6 2.2000mf r9k/r1k c7 3 22.000mf r9k/r1k c8 3 220.00mf r9k/r1k 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 dis.c 2. discharging through the chip is quite slow. we recommend the user to discharge the capacitor with some other apparatus. 3. in c7~c8 ranges, the bargraph is used to show the measured time in counting down. 4. the c2 range is calibrated by vr near the ovx pin. 5. in ranges of c1~c8, the shift feature is also available to m ove the digits and decimal points rightward to prevent the least digit from jumping. 1.6 continuity check continuity check shares the same configuration with 220.00 ? manual resistance measurement mode, but with buzzer output to indicate continuity. the buzzer generates a 2khz sound whenever the digit number is less than 30 ? . 1.7 diode measurement diode measurement mode shares the same configuration with 2.2000v manual voltage measurement mode.. the buzzer generates a 2khz sound whenever the digit number is less than 30mv. when the lcd display counts are larger than 1.9000v, the ol will be shown. ver. 1.2 10/05/27 11 ES51931 22,000 counts auto dmm 1.8 frequency counter the time base of the frequency counter is deri ved from an external crystal oscillator by 4,000,000 t counter = f osc where f osc is the frequency of the crystal oscill ator. 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 22.00hz to 220.00mhz. the following tabl e summarizes the full-scale range of the frequency counter. in frequency mode , press vahz button switches the mode to/from duty cycle mode. range full scale 2 fr1 22.00hz 1 3 fr2 220.0hz 1 fr3 22.000khz fr4 220.00khz fr5 2.2000mhz fr6 22.000mhz fr7 220.00mhz note: 1 in the range fr1~fr2, the maximum counting number is 2200 counts. 2 in the range fr1, ES51931 will show 0.00hz if the input frequency is less than 2.00hz. 3 in the range fr2 (manual mode), ES51931 will show 0.0hz if the input frequency is less than 20.0hz.. 1.8.1 duty cycle measurement the duty cycle measurement is available in frequency mode with vahz operation. press vahz key when frequency mode is in operation, the ES51931 will switch to duty cycle measurement mode. press vahz key again to switch to frequency measurement mode also. the duty cycle mode range is within 5.0% to 94.9%. the minimum resolution is 0.1%. if the source frequency duty cy cle is smaller than 5.0%, the ul will be shown on the lcd display. if the duty cycle is larger than 94.9%, the ol will be shown on the lcd display. ver. 1.2 10/05/27 12 ES51931 22,000 counts auto dmm 1.9 temperature measurement mode temperature measurement mode takes input si gnal from adp pin an d reference voltage from (va+ - va-). ES51931 has a built-in -to- H scale translation circuit, and only needs an external scale application circuit. the application circuit for H scale is not required. in temperature measurem ent mode, the default range is 2200.0 or H. the vbar pin is used to control the s econd decimal point (dp2) on the lcd panel. when vbar is low, dp2 is turned on and th e first decimal point (dp1) is turned off. and the range becomes 220.00 and H. 1.10 auto power off and idle time selection ES51931 has a default auto power off function. if the meter is idle for more than the given idle time, the chip auto matically turns the power off. the idle time to trigger the auto power off function is determined by pi n ?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 kept floating, the idle time will be set to 15 minutes. when apo happens, the state of the meter is saved. the apo symbol on th e lcd panel indicates whether the auto power off is enabled or not. in some cases, us er 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 of f function is also disabled. note : power on the meter while pressing hold and lasts 1 seconds turns on all lcd segments until hold is pressed again. 1.11 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. 1.12 re-power on after auto power-off, pushing any of the pus h 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. ver. 1.2 10/05/27 13 ES51931 22,000 counts auto dmm 2. measurement mode switching measurement mode depends on the logic level of slacdc, fc 1, fc2, fc3, fc4, fc5, and key. when fc5 is high, the m easurement mode list is below. slacdc fc1 fc2 fc3 fc4 mode function of key 0 1 0 1 1 voltage measurement dcv ? acv 0 1 1 0 1 auto dc current measurement( a) dca ? aca 0 1 1 1 1 auto dc current measurement(ma) dca ? aca 0 0 0 0 0 3 22a dc current measurement(a) dca ? aca 0 1 1 1 0 dcmv 220.00mv dcmv ? acmv 0 1 1 0 0 2 manual dc 22.000a dca ? aca 0 1 0 0 0 manual dc 220.00a dca ? aca 0 1 0 1 0 manual dc 2200.0a dca ? aca 0 1 0 0 1 manual dc 22000a dca ? aca 0 0 0 1 1 resistance measurement ? ? continuity 0 0 0 0 1 continuity check continuity ? diode 0 0 1 1 1 resistance measurement ? ? continuity ? diode 0 0 0 1 0 frequency measurement ? 0 0 1 1 0 capacitance measurement ? 0 0 1 0 0 temperature measurement ? H 0 0 1 0 1 resistance measurement ? ? diode 1 1 0 1 1 voltage measurement acv ? dcv 1 1 1 0 1 auto ac current measurement( a) ac a ? dc a 1 1 1 1 1 auto ac current measurement(ma) acma ? dcma 1 0 0 0 0 3 22a ac current measurement(a) aca ? dca 1 1 1 1 0 acmv 220.00mv acmv ? dcmv 1 1 1 0 0 2 manual ac 22.000a aca ? dca 1 1 0 0 0 manual ac 220.00a aca ? dca 1 1 0 1 0 manual ac 2200.0a aca ? dca 1 1 0 0 1 manual ac 22000a aca ? dca 1 0 0 1 1 1 adp0(22000) ? 1 0 0 0 1 adp1(2200.0) ? 1 0 1 1 1 adp2(220.00) ? 1 0 0 1 0 adp3(22.000) ? 1 0 1 1 0 adp4(2.2000) ? 1 0 1 0 0 temperature measurement H ? 1 0 1 0 1 capacitance measurement (clamp) 4 ? x means ?don?t care?. note1: when fc5 is high, the adp0, adp1, adp2, adp3 and adp4 modes can display minus sign. note2: the manual dc/ac 22a, 220a, 2200a and 22000a modes are designed for clampmeter. note3: dc 22a and ac 22a current measurement m odes, (fc1~4) = (0, 0, 0, 0), are designed for multimeter. note4: it provides the ranges from 2.2uf to 220mf in this mode. ver. 1.2 10/05/27 14 ES51931 22,000 counts auto dmm when fc5=low, key is disabled and the measurement mode list is below. slacdc fc1 fc2 fc3 fc4 mode push key to select lpf 3db 0 1 0 1 1 dc voltage measurement 0 1 1 0 1 auto dc current measurement( a ) 0 1 1 1 1 auto dc current measurement(ma) 0 0 0 0 0 3 22a dc current measurement(a) 0 1 1 1 0 dc 220.00mv 0 1 1 0 0 2 manual dc 22.000a 0 1 0 0 0 manual dc 220.00a 0 1 0 1 0 manual dc 2200.0a 0 1 0 0 1 manual dc 22000a 0 0 0 1 1 resistance measurement 0 0 0 0 1 continuity check 0 0 1 1 1 diode measurement 0 0 0 1 0 frequency measurement 0 0 1 1 0 capacitance measurement 0 0 1 0 0 temperature measurement ( o c) 0 0 1 0 1 resistance measurement 1 1 0 1 1 ac voltage measurement o 1 1 1 0 1 auto ac current measurement( a) o 1 1 1 1 1 auto ac current measurement(ma) o 1 0 0 0 0 3 22a ac current measurement(a) 1 1 1 1 0 ac 220.00mv o 1 1 1 0 0 2 manual ac 22.000a o 1 1 0 0 0 manual ac 220.00a o 1 1 0 1 0 manual ac 2200.0a o 1 1 0 0 1 manual ac 22000a o 1 0 0 1 1 1 adp0(22000) 1 0 0 0 1 adp1(2200.0) 1 0 1 1 1 adp2(220.00) 1 0 0 1 0 adp3(22.000) 1 0 1 1 0 adp4(2.2000) 1 0 1 0 0 temperature measurement ( o f) 1 0 1 0 1 capacitance measurement (clamp) 4 x means ?don?t care?. note1: when fc5 is low, the adp0-adp4 modes can not display minus sign. note2: the manual dc/ac 22a/220a/2200a/22000a modes are designed for clampmeter. note3: dc 22a and ac 22a current measurement mode, (fc1~4) = (0, 0, 0, 0), is designed for multimeter. note4: it provides the ranges from 2.2uf to 220mf in this mode. ver. 1.2 10/05/27 15 ES51931 22,000 counts auto dmm 3. 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, and zero functions. the following table lists the available function versus every measurement mode. function mode range hold max/min rel zero vahz voltage o o o o x o current1 o o o o x o current2 x o o ac dc o resistance o o o o x x capacitance o o o o x x frequency o o x x x o duty cycle x o x x x x continuity x o o o x x diode x o o o x x temperature x o o o x x adp x o o o x x note: current1 includes auto a, auto ma and 22a modes. current2 includes manual 2.2a, 22a, 220a, 2200a and 22000a modes. 3.1 hold and delay hold hold mode makes the meter stop updating the lcd panel. this mode can be nested in most of the special modes. enabling hol d function in automatic mode makes the meter switch to manual mode, but the fu ll-scale range remains the same. hold function can be cancelled by changing the measurement mode, pressing range, or push hold again. ES51931 provides a delay hol d 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. to cancel the dela yed state, push the hold bottom again. ver. 1.2 10/05/27 16 ES51931 22,000 counts auto dmm 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 manual mode 1 push < 1 sec 1 push > 1 sec 1 p ush < 1 sec range up measurement mode auto manual control range initial range 220.00mv(dc/ac) vr1 vr1 220.00mv 220.00mv v(dc/ac) vr2 ? vr5 vri vri + 1, vr5 vr2 2.2000v ? 1010.0v 2.2000v auto 220v/1010v (set vst to low) vr4-vr5 vri vri + 1, vr5 vr2 2.2000v ? 1010.0v 220.00v auto a(dc/ac) r1 ? r2 r1 r2, r2 r1 220.00a ? 2200.0a 220.00a auto ma(ac/dc) r1 r2 r1 r2 r2 r1 22.000ma ? 220.00ma 22.000ma 22 a(dc/ac) fixed fixed 22.000a 22.000a auto 22a/220a (dc/ac) r1 ? r2 r1 r2, r2 r1 22.000a ? 220.00a 22.000a auto 220a/2200a (dc/ac) r1 r2 r1 r2 r2 r1 220.00a ? 2200.0a 220.00a ? or1 - or7 ori ori + 1, or7 or1 220.00 ? ? 220.00m ? 220.00? capacitance c1 ? c8 ci ci + 1, c8 c1 22.000nf ? 220.00mf 22.000nf capacitance (clamp mode) c3 ? c8 ci ci + 1, c8 c3 2.2000 f ? 220.00mf 2.2000 f continuity fixed fixed 220.00 ? 220.00? diode fixed fixed 2.2000v 2.2000v frequency fr1 ? fr7 fri fri + 1 fr7 fr1 22.00hz ? 220.00mhz 22.00hz note: pushing range resets all existing special modes. normal mode (auto/manual) hold mode (manual) push < 2s delay state (auto/manual) push > 2s push < 2s push < 2s push > 2s 6sec past ver. 1.2 10/05/27 17 ES51931 22,000 counts auto dmm 3.3 key see section ?measurement mode switchi ng? for the function of this pin. 3.4 rel + hold in rel mode, the lcd panel displays d n+k - d n , where d n = 1, 2, 3, , d n is the last value before rel is pushed, and d n+k is the current value. if rel is pushed again in rel mode, the meter displays the refe rence value. the meter returns to normal operation if rel is pressed and held for longer than one second. pressing hold in rel mode makes the meter st op updating the lcd panel. note: it?s possible that the relativ e value exceeds 22,000 or ?22,000 counts. such relative values are displayed. the lcd pa nel shows ol in rel mode only if d n or d n+k is more than 22,580 counts. 3.5 max/min + hold the meter displays the maximum or minimu m 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 me ter displays the minimum value. when max/min is pressed for the third time, the meter displays current value with max/min blinking. the meter returns to normal operation if max/min is pressed and held for longer than one second. pr essing hold in max/min mode makes the meter stop updating the maximum or the minimum value. original state (automatic/manual) ?max? active max value ?min? active min value ?max? ?h? active hold max value. ?min? ?h? active hold min value. push hold push hold 1push<1s 1 push>1 sec 1 push>1s 1 push<1s ?max? ?min? blink current value 1push<1s push hold ?max??min? ?h? blink hold current value. 1push<1s 1push<1s 1 push>1 sec 1push<1s 1push<1s original state (auto/manual) relactive. the relative value reland h active. hold the relative value push hold push rel push rel push hold ver. 1.2 10/05/27 18 ES51931 22,000 counts auto dmm 3.6 relative + max/min + hold max/min mode can be nested in rel m ode. the meter displays the maximum or minimum value relative to the reference when max/min is pressed in rel mode. pressing hold under rel + max/min makes the meter stop updating the lcd panel. original state (auto/manual) 3.7 zero : in manual dc 22.000a, 220.00a, 2200.0a and 22000a measurement modes , the rel pin changes to control zero function instead of relative function. in zero mode, the lcd panel displays d n+k - d n , where d n = 1, 2, 3, , d n is the last conversion value before zero is pushed, and d n+k is the current conversion value. if zero is pushed again in zero mode, the meter will refresh the d n value and displays the d n+k - d n again. the meter returns to normal operat ion 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 zero mode, lcd will not show any symbol to remind users of zero mode is active. in 2-range auto dc a modes for clampmeter (220.00a/2200.0a or 22.000a/220.00a), the system will stay in automa tic 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 relactive. the relative value push max/min push max/min > 1s rel and max active. maximum rel. value rel and min active. minimum rel. value rel max min blink. current rel. value push max/min rel, max , h active. hold max. rel. value rel, min , h active. hold min. rel. value rel , max , min , h blink. hold the current rel. value push rel push rel push max/min push max/min push max/min push hold push hold push hold push max/min ver. 1.2 10/05/27 19 ES51931 22,000 counts auto dmm the range could not be higher one in auto matic mode. when enter zero mode from lower range, the system will store the nonzer o counts (residual current value). if the range goes up to higher one automatically, the nonzero counts will be divided by ten. so this function will still work well in automatic modes. state diagram for zero mode: original state state diagram for zero + hold mode: state diagram for zero + max/min + hold mode: original state ?zero? active show d n+k - d n press zero > 1s press zero press zero < 1s ?zero? ?hold? active stop lcd upgrading press hold ?zero? active show d n+k - d n press zero > 1s press zero press zero < 1s original state ?zero? active show d n+k - d n ?zero? ?max? active max. d n+k - d n va l u e ?zero? ?min? active min. d n+k - d n press zero > 1s press zero v l ?zero? ?max? ?hold? active hold max. d n+k - d n va l u e ?zero? ?min? ?hold? active hold min. d n+k - d n va l u e press hold press hold press max/min press max/min < 1s press max/min < 1s press max/min > 1s press zero < 1s ?zero? ?max? ?min? blink. current d n+k - d n va l u e press hold ?zero? ?max? ?min? ?hold? blink. hold current d n+k - d n va l u e ver. 1.2 10/05/27 20 ES51931 22,000 counts auto dmm 4. 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 0 1 p p -3v 0v lsb msb d0 ~d6 one data block consists of 14 packets, or 140 bits. the following figure shows the format of a data block. the range packet in dicates the full scale range of the meter. digit4 through digit0 are just the digi ts on the lcd panel. the function packet indicates the measurement mode of the meter. status, option1~4 give the status of the meter. cr and lf are delimiters used to separate the blocks. all packets the meter always outputs the current input value to the serial port in spite of hold mode. the detailed data format of each packet is listed at next page. ver. 1.2 10/05/27 21 ES51931 22,000 counts auto dmm 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-fc5 switch. code measurement mode vbar=0 vbar=1 0111011 voltage don?t care 0111101 auto a current auto a current auto 220.00a/2200.0a 0111111 auto ma current auto ma current auto 22.000a/220.00a 0110000 22 a current 0111001 manual a current 0110011 0110101 continuity 0110001 diode 0110010 1 frequency 0110110 capacitance 0110100 2 temperature 0111110 adp don?t care 1. when the function code = 0110010, the measurement mode is determined by judge bit of status packet. if judge bit is 1, it means frequency mode. if judge bit is 0, it means duty cycle mode. 2. when the function code = 0110100, the judge bit in the status packet determines whether the unit is celsius or fahrenheit. and the digit4~0 only presents celsius value whatever the mode is o c or o f. 3. when the function code = 0111101 or 0111111, the measurement mode is determined by vbar bit. 4.2 range this packet indicates the full-scale range of the meter. when the meter operates in continuity mode or diode mode, this pack et is always 0110000 si nce 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 22 a manual a adp frequency capacitor 0110000 2.2000v lower range(ivsl) 22.000 a 2.2000a adp4 220.00 ? 22.00hz 22.000nf 0110001 22.000v higher range(ivsh) 22.000a adp3 2.2000k ? 220.0hz 220.00nf 0110010 220.00v 220.00a adp2 22.000k ? 2.2000f 0110011 2200.0v 2200.0a adp1 220.00k ? 22.000khz 22.000f 0110100 220.00mv 22000a adp0 2.2000m ? 220.00khz 220.00f 0110101 22.000m ? 2.2000mhz 2.2000mf 0110110 220.00m ? 22.000mhz 22.000mf 0110111 220.00mhz 220.00mf * it includes auto a, ma, 22.000a/220.00a, 220.00a/2200.0a. ver. 1.2 10/05/27 22 ES51931 22,000 counts auto dmm 4.3 digit 4 ? digit 0 digit 4 is the first significant digit on the lcd panel, and digit 0 is the least significant digit. digit code 0 0110000 1 0110001 2 0110010 3 0110011 4 0110100 5 0110101 6 0110110 7 0110111 8 0111000 9 0111001 4.4 status the format of this package shown below. th e judge field is meaningful only when the function packet indicates temperature mode. in temperature mode, judge is 1 if the unit is c and is 0 of the unit is f. sign field indicates whether the minus sign on the lcd panel is on or off. batt field is one when battery low condition is true. ol indicates input overflow. 0 1 1 judge sign batt ol bit6 bit 5 bit 4 bit 3 bit 2 bit1 bit 0 4.5 option 1 this packet contains information on the pus h function of the meter. the format is shown below. max, min or rmr bit will be high if the meter enter max/min function and stay at state of maximum, minimum or current value re spectively. rel bit will be high if meter enters rel/zero mode. 0 1 1 max min rel rmr bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 ver. 1.2 10/05/27 23 ES51931 22,000 counts auto dmm 4.6 option 2 0 1 1 ul 0 0 0 bit 6 bit 5 bit 4 bit 3 bit 2 bit1 bit 0 under the following conditions, th e ul bit will be set to 1. 1. in 22.00hz range, the input frequency is less than 2.00hz. 2. in 220.0hz range, the input frequency is less than 20.0hz. 3. in duty cycle mode, the r eading is less than 10.0%. 4.7 option 3 this packet contains information on the ope ration 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 1 1 dc ac auto vahz bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 4.8 option4 this packet contains information on the ope ration mode of the meter. the format is shown below. vbar will be set to high, only when the vbar pin is connected to v-. hold bit is set to high when meter enters hold mode. the defau lt value of lpf0/lpf1 bit are all ?hi?. when the low-pass-filter f eature is activated, the 3db bw status is shown in the table below. 3db bw lpf1 lpf0 full 0 0 10khz 0 1 1khz 1 0 lpf off 1 1 0 1 1 hold vbar lpf1 lpf0 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 ver. 1.2 10/05/27 24 ES51931 22,000 counts auto dmm 4.9 cr carriage returns. the transmitted code is 0001101. 4.10 lf line feed. the transmitted code is 0001010. 5. miscellaneous the conditions on which the meter turns on the buzzer include: (1) changing measurement mode generates one beep. (2) pressing any of the push functions genera tes one beep, if the function is valid. (3) power on and re-power on generate one beep. (4) input overflow in voltage (220mv range not included) 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 that lasts for 1.5 seconds. the following figures show the output waveform from the buzout pin. 0.5 ms (a) continuous 2khz beep 0.3 sec 0.15 sec (b) 3.33 beep/sec ver. 1.2 10/05/27 25 ES51931 22,000 counts auto dmm 5.1 lcd panel configuration seg01 seg02 seg03 seg04 seg05 se g06 seg07 seg08 seg09 seg10 seg11 bp1 batt apo dc auto 5f 5a 5b manu 4f 4a 4b bp2 bar- rs232 ac - 5e 5g 5c dp4 4e 4g 4c bp3 bar0 bar2 bar4 bar6 bar8 5d bar11 bar13 bar15 4d bar18 bp4 bar1 bar3 bar5 bar7 bar9 bar10 bar12 bar14 bar16 bar17 bar19 seg12 seg13 seg14 seg15 seg16 se g17 seg18 seg19 seg20 seg21 seg22 bp1 hold 3f 3a 3b 2a % o c o f 1a bp2 dp3 3e 3g 3c dp2 2f 2g 2b dp1 1f 1g bp3 bar20 bar22 3d bar25 bar27 2e 2d 2c bar32 1e 1d bp4 bar21 bar23 bar24 bar26 bar28 bar29 bar30 bar31 bar33 bar34 bar35 seg23 seg24 seg25 seg26 seg27 seg28 seg29 seg30 seg31 bp1 1b 2 m 2 v a rel adp1 n bp2 1c m k ? hz max adp2 1 full bp3 bar36 bar38 bar40 bar42 bar44 min adp3 m 1 10khz bp4 bar37 bar39 bar41 bar43 bar45 adp0 adp4 f 1khz auto dc ac apo hold adp0 a batt rs232 bp1 bp2 bp3 bp4 s14 s15 s16 s17 s18 s19 s20 s21 s22 s23 s24 s02 s01 s03 s04 s05 s06 s07 s08 s09 s10 s12 s11 s13 s25s27 s26 s28 s29 s30 s31 manu % rel max min adp4 adp3 adp2 adp1 nm f m v k mhz 20 1k full 10k 15 22.5 10 5 0 ver. 1.2 10/05/27 26 ES51931 22,000 counts auto dmm lcd backplane waveform 5.2 lcd display on condition lcd annunciator condition v in voltage measurement mode, and diode measurement mode. a in current measurement mode. ? in resistance measurement mode, and continuity mode. f in capacitance measurement mode. in continuity check mode. in diode mode. hz in frequency mode. % in duty cycle mode. dc in dc voltage or dc current mode. ac in ac voltage or ac current mode. auto when automatic full scale range selection is enabled. manu in manual mode. hold when hold function is enabled. rel when relative function is enabled. max / min when maximum or minimum function is enabled. p max / p min when p max or p min function is enabled. m 1 in capacitor measurement mode and the fu ll scale range is in the order of mf. 1 in capacitor measurement mode and the fu ll scale range is in the order of uf. n in capacitor measurement mode and the fu ll scale range is in the order of nf. m 2 in voltage or current measurement mode and the full scale range is in the order of 10 -3 . 2 in current measurement mode and the fu ll scale range id in the order of ua. m in resistance measurement mode and th e full scale range is in the order of m ? k in resistance measurement mode and th e full scale range is in the order of k ? in temperature measurement mode and when the unit is H in temperature measurement mode and when the unit is H apo when auto power off function is enabled. full/10k/1khz low pass filter is active with 3db = full bandwidth/10khz/1khz adp0-adp4 when adp mode is active, the ad p0-adp4 segment will be active respectively. rs232 when rs232 output is enabled. v- +3.1 v- +3.1 v- v- v- +3.1 v- v- +3.1 v- v -+3.2 v - v -+3.2 v - v -+3.2 v - v -+3.2 v - v -+3.2 v - ver. 1.2 10/05/27 27 ES51931 22,000 counts auto dmm 5.3 programmable lcd segment display ES51931 supports a ?programmable lcd segment display?(plsd) feature. except capacitor measurement mode & duty cycle measurement, all modes could support plsd. plsd allows the meter designer to process or modify the conversion results by external microprocessor and displaye d on lcd panel. the more accurate and stable reading would be possible. ES51931 provides uplc d, sclk and sdata pins to archive the plsd feature. connect up lcd to v- to enable plsd feature and received the serial data from sdo pin. afte r the data processing, transfer the display data through the sdata and give a cloc k signal to sclk. ES51931 will receive the display data through sdata at the falling edge of clock signal, then display the data on lcd panel. only the segments shown be low could be modified, other segments are still controlled by ES51931. when the cap acitor or duty mode is selected, the lcd display is determined by ES51931. about the details of serial data format, please refer to page 21-25. dp1 dp2 dp3 dp4 lsign d1 d2 d3 d4 d5 a aa a a bbb b b c c c c c d d d d d e e e e e f f f f f gg g g g adp0 adp1 adp2 adp3 adp4 plsd data format: b1 b2 b3 b4 b5 b6 b7 b8 b9 b10 b11 b12 ol a dp0 a dp1 a dp2 a dp3 a dp4 d1a d1b d1c d1d d1e d1f b13 b14 b15 b16 b17 b18 b19 b20 b21 b22 b23 b24 d1g dp1 d2a d2b d2c d2d d2e d2f d2g dp2 d3a d3b b25 b26 b27 b28 b29 b30 b31 b32 b33 b34 b35 b36 d3c d3d d3e d3f d3g dp3 d4a d4b d4c d4d d4e d4f b37 b38 b39 b40 b41 b42 b43 b44 b45 b46 d4g dp4 d5a d5b d5c d5d d5e d5f d5g lsign note: the b1 should be sent first and the last is b46. set the ol bit = 1, the buzzer output will be active for 3.3beep/sec in voltage & current mode. and if auto range is availa ble, it will change to higher range if lcd bar44 is active also. ver. 1.2 10/05/27 28 ES51931 22,000 counts auto dmm block diagram: operation timing diagram for plsd feature is shown as below: parameter symbol min. typ. max. unit sclk clock frequency f sclk 10 - 100 khz sclk clock time ?l? t low 4.7 - - sclk clock time ?h? t high 4.0 - - us data input setup time t setup 200 data input hold time t hold 100 ns sclk/sdata rising time t r 1.0 sclk/sdata falling time t f 0.3 us sclk delay time after receiving rs232 t delay 0.1 100 ms p ES51931 sdo rs232 data sdata . . . scl k plsd data plsd data rs232 data is received start to send plsd data cr lf t delay sdata sclk t low t hig t hold sclk sdata t setu t f t r 46 clock pulses uplcd fc1-fc5/slacdc sdo ver. 1.2 10/05/27 29 ES51931 22,000 counts auto dmm 5.4 operating timing ES51931 incorporates a dual slope adc with four phases: zi, az, int and dint. the adc consists of a high-re solution part for digital display and a high speed part for the bar-graph display. the time of each phase is shown below: * voltage /current /ohm/cont ./diode/adp measurement: phase high resolution high speed zi 100ms 10ms az 74ms 7.4ms int 100ms 10ms dint 226ms 22.6ms *capacitance measurement: range maximum measurement period 22.000nf 0.5sec 220.00nf 0.5sec 2.2000uf 0.5sec 22.000uf 0.5sec 220.00uf 0.5sec 2.2000mf 1sec 22.000mf 5sec 220.00mf 25sec * frequency measurement the measurement cycle = 1.05 sec p.s . in the frequency measurement with auto mode, if th e range is changed, the internal clock rate will increase five times and the new measurement cycle becomes 0.21 sec until the range is stable. ver. 1.2 10/05/27 30 ES51931 22,000 counts auto dmm 6. test circuit 4. current test 1. vo ltage test 6. low battery 680k 270k ba tt lba t 9 v - agnd 0. 1u 0v 9v d1 3.9k ovsg or1 vr5 vr4 vr3 vr2 v r 1 100 1k 10.01 k 101 k 10m ado adi acvl acvh v r 88m d2 0. 1u 4. 7u 3k 2 k 3. 9k 1. 0u 1. 0u 1 . 111 m - 100mv tes t5 voltage input agnd - 100 m v adp 100k va - va + 7. adp test sgnd agnd adpin+ adpin- 100 1.5k ptc z1 6v ovsg 10m 1.111m ovh vr1 vr2 5 . diode test agnd z2 100k 100k 900 90 9 0.99 0.01 ma ma ua ua ua ma ivsl ivsh agnd a sgnd 20a 2. resistor test ovx fin f r e q 2.2u ptc 200 1.5k 8. frequency test 100 1.5k ptc z1 6v ovh ovsg or1 vr5 vr4 vr3 vr2 100 1k 10.01 k 101k 1.111m sgnd agnd ohmc4 ohmc3 ohmc2 ohmc1 22n 220n 330n 47n z2 3. capacitor test 100 1.5k ptc z1 6v ovh ovsg or1 vr5 vr4 vr3 vr2 100 1k 10k 101k 1.111m ovx ca+ ca- z2 100k 220p r9k r1k 20k ver. 1.2 10/05/27 31 ES51931 22,000 counts auto dmm 7. application circuit 7.1 avg circuit 1 2 3 4 56 a b c d 6 5 4 3 2 1 d c b a title number revision size b date: 27-may -2010 sheet of file: f:\protel file\ka019.ddb drawn by : + c6 10uf + c5 10uf zr2 7.5v v + c7 0.1uf c8 0.1uf zr1 5.6v sw4 power switch v - sw16 peak sw18 key sw19 rel_zero sw20 range sw21 hold sw15 bkli t bkli t max/mi n range key rel_zero hold sw17 max/mi n peak sw10 fc4 sw11 fc3 sw12 fc2 sw13 fc1 sw9 fc5 sw8 slacdc fc1 fc2 fc3 fc4 fc5 slacdc v - average circuit r28 5k vr3 10k d1 1n4148 d2 1n4148 r26 7.5k r27 7.5k test5 adi acvh ado acvl + c24 4.7uf +c25 1uf + c26 1uf c9 0.1uf r30 100k r29 100k ver : 1 es 51931 avg circ uit v - r19 10k r20 10k buzout q3 r9 100k c16 47nf c13 22nf c21 100nf r12 100k c2 470nf r11 100k c18 220nf r18 10k r10 100k ivsh ivsl c12 220pf r6 1.5k ptc r7 100 vr1 20k r8 100 r15 1k r17 101k r24 1.111m acvl acvh ado sw22 sw_rc adi test5 ovsg c14 22nf c19 220nf c22 330nf vr2 10k r25 91k vr r13 100k va- va+ r23 10m c3 470nf r32 9k r31 1k c20 10nf ovh q1 q2 v + + c23 4.7uf detailed detailed + c27 1uf ci h ci l vrh r16 10k r21 10 c17 47nf r22 100k r14 100k vr1 vbar c28 100pf c15 2.2nf sleep buzin freq c29 470pf annunc hold range rel_zero key max/mi n bkli t rs232 y1 4mhz c1 470nf aposel shift bksel cesel fc5 vst fc4 fc3 fc2 fc1 slacdc sdo lbat9 v - buzout bkout scl sda uplcd vahz sw14 vahz vahz v - adp v220m vin r33 200 r34 2.2k p tc + c30 2.2uf fin q6 q5 q7 q4 r1 sw1 sw spdt r3 r4 1 j2 20a 1 j3 gnd sw2 ua sw3 ua sw5 ma sw6 ma sw7 a r2 r5 900 90 9 0.99 0.01 ua ma ua / ma 1 j1 regulator dc 3.0v metallized polypropylene film capacitor : c18 metallized polyester capacitor : c2, c13, c10, c11 current measurement input terminals should be protected by voltage bz1 buzze r hi-impedance buzzer mcu scl sda slacdc fc5 fc4 fc3 fc2 fc1 sdo uplcd (option) v+ 1 cl+ 11 v+ 2 dgnd 3 agnd 4 agnd 5 ch+ 6 ch- 7 ci h 8 buffh 9 cazh 10 cl- 12 ci l 13 cazl 14 bufl 15 raz 16 ivsh 17 ivsl 18 ovx 19 ovh 20 ovsg 21 or1 22 vr5 23 vr3 25 vr2 26 test5 27 acvl 28 vr4 24 acvh 29 adi 30 ado 31 ohmc4 32 ohmc3 33 ohmc2 34 nc 36 ohmc1 35 vrh 37 vr 38 sgnd 39 adp 40 va+ 41 va- 42 v220m 43 vr1 44 vbar 45 ca- 46 ca+ 47 r9k 48 r1k 49 nc 50 nc 51 lpfc1 52 lpfc2 53 lpfout 54 lpfc3 55 buzin 56 sleep 57 freq 58 seg31 59 nc 60 seg30 61 seg29 62 seg28 63 seg27 64 seg26 65 seg25 66 seg24 67 seg23 68 seg22 69 seg21 70 seg20 71 seg19 72 seg18 73 seg17 74 seg16 75 seg15 76 seg14 77 seg13 78 seg12 79 seg11 80 seg10 81 seg09 82 seg08 83 seg07 84 seg06 85 seg05 86 seg04 87 seg03 88 seg02 89 seg01 90 bp4 91 bp3 92 bp2 93 bp1 94 annunc 95 hold 96 range 97 rel_zero 98 key 99 max/mi n 100 nc 101 bklit 102 vahz 103 buzout 104 bkout 105 osc2 106 osc1 107 sclk 108 sdata 109 uplcd 110 rs232 111 aposel 112 bksel 113 vst 114 shift 115 cesel 116 slacdc 117 fc5 118 fc4 119 fc3 120 fc2 121 fc1 122 sdo 123 c+ 124 c- 125 v- 126 v- 127 lbat9 128 u1 es 51931 ver. 1.2 10/05/27 32 ES51931 22,000 counts auto dmm 7.2 true rms circuit 1 2 3 4 56 a b c d 6 5 4 3 2 1 d c b a title number revision size b date: 27-may -2010 sheet of file: f:\protel file\ka019.ddb drawn by : + c6 10uf + c5 10uf zr2 7.5v v + c9 0.1uf c10 0.1uf zr1 5.6v sw4 power switch v - sw16 peak sw18 key sw19 rel_zero sw20 range sw21 hold sw15 bkli t bkli t max/mi n range key rel_zero hold sw17 max/mi n peak sw10 fc4 sw11 fc3 sw12 fc2 sw13 fc1 sw9 fc5 sw8 slacdc fc1 fc2 fc3 fc4 fc5 slacdc v - ver : 1 es 51931 rms circ uit v - r20 10k r21 10k buzout q3 r9 100k c17 47nf c14 22nf c22 100nf r12 100k c2 470nf r11 100k c19 220nf r18 10k r10 100k ivsh ivsl c13 220pf r6 1.5k ptc r7 100 vr1 20k r8 100 r15 1k r17 101k r25 1.111m acvl acvh ado sw22 sw_rc test5 ovsg c15 22nf c20 220nf c25 330nf vr2 10k r26 91k vr r13 100k va- va+ r24 10m c3 470nf r29 9k r28 1k c21 10nf ovh q1 q2 v + + c23 4.7uf detailed detailed + c27 1uf ci h ci l vrh r16 10k r22 10 c18 47nf r23 100k r14 100k vr1 vbar c28 100pf c16 2.2nf sleep buzin freq c29 470pf annunc hold range rel_zero key max/mi n bkli t rs232 y1 4mhz c1 470nf aposel shift bksel cesel fc5 vst fc4 fc3 fc2 fc1 slacdc sdo lbat9 v - buzout bkout scl sda uplcd vahz sw14 vahz vahz v - adp v220m vin r30 200 r32 2.2k p tc + c30 2.2uf fin q6 q5 q7 q4 r1 sw1 sw sp dt r3 r4 1 j2 20a 1 j3 gnd sw2 ua sw3 ua sw5 ma sw6 ma sw7 a r2 r5 900 90 9 0.99 0.01 ua ma ua / ma 1 j1 re gula tor dc 3.0v metallized poly propy lene film capacitor : c19 metallized polyester capacitor : c2, c11, c12, c14 current measurement input terminals should be protected by voltage bz1 buzze r hi-impedance buzzer mcu scl sda slacdc fc5 fc4 fc3 fc2 fc1 trms circuit acvh + c7 10uf + c8 10uf + vs - vs vin 1 en 2 - vs 3 cav 4 db 5 buf out 6 buf in 7 iout 8 rl 9 common 10 nc 11 nc 12 nc 13 + vs 14 u2 es636 + c24 4.7uf + c31 2.2uf vr4 500k r19 10k r31 200 + vs - vs + vs - vs + c26 22uf vr3 500 adi r27 220k + vs sw23 acvrms sdo uplcd (option) v+ 1 cl+ 11 v+ 2 dgnd 3 agnd 4 agnd 5 ch+ 6 ch- 7 ci h 8 buffh 9 cazh 10 cl- 12 ci l 13 cazl 14 bufl 15 raz 16 ivsh 17 ivsl 18 ovx 19 ovh 20 ovsg 21 or1 22 vr5 23 vr3 25 vr2 26 test5 27 acvl 28 vr4 24 acvh 29 adi 30 ado 31 ohmc4 32 ohmc3 33 ohmc2 34 nc 36 ohmc1 35 vrh 37 vr 38 sgnd 39 adp 40 va+ 41 va- 42 v220m 43 vr1 44 vbar 45 ca- 46 ca+ 47 r9k 48 r1k 49 nc 50 nc 51 lpfc1 52 lpfc2 53 lpfout 54 lpfc3 55 buzin 56 sleep 57 freq 58 seg31 59 nc 60 seg30 61 seg29 62 seg28 63 seg27 64 seg26 65 seg25 66 seg24 67 seg23 68 seg22 69 seg21 70 seg20 71 seg19 72 seg18 73 seg17 74 seg16 75 seg15 76 seg14 77 seg13 78 seg12 79 seg11 80 seg10 81 seg09 82 seg08 83 seg07 84 seg06 85 seg05 86 seg04 87 seg03 88 seg02 89 seg01 90 bp4 91 bp3 92 bp2 93 bp1 94 annunc 95 hold 96 range 97 rel_zero 98 key 99 max/mi n 100 nc 101 bkli t 102 vahz 103 buzout 104 bkout 105 osc2 106 osc1 107 sclk 108 sdata 109 uplcd 110 rs232 111 aposel 112 bksel 113 vst 114 shift 115 cesel 116 slacdc 117 fc5 118 fc4 119 fc3 120 fc2 121 fc1 122 sdo 123 c+ 124 c- 125 v- 126 v- 127 lbat9 128 u1 es 51931 ver. 1.2 10/05/27 33 ES51931 22,000 counts auto dmm notes: 1. most of pins are protected by the esd protection circuits. however pins, v+, v-, agnd, dgnd and vr1 are not protected enough because the parasitic eff ect must be decrease. th erefore enough external protection is needed for assembling, carrying and keeping. in addition, components connecting to these unprotected pins have to be soldered on board before the ic is soldered. 2. cp is the compensation capacitor for measuring capacitance. its value depends on the parasitic capacitor on the pcb board. 3. light shielding for the diodes and zener diodes. ver. 1.2 10/05/27 34 ES51931 22,000 counts auto dmm 8. package 1. 128l lqfp topview 2. dimension parameters |
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