v1.0 06/03/10 1 ES5128 4-1/2 digit with led features ? max. 19,999 counts ? qfp-44l package ? input full scale range: 200mv or 2v ? built-in multiplexed led display driver: 4-1/2 digits, 4 decimal points and polarity ? underrange/overrange outputs ? 10v resolution on 200mv scale ? display hold ? precise 10:1 range select ? true differential input and reference ? built-in inverters for rc oscillation circuit. application panel meter description ES5128 is a 19,999-count analog-to-digital converter (adc) with multiplexed led display driver. it drives 4-1/2 digits, 4 decimal points and polarity segments. it typically requires a dual +5v/-5v power supply or a 10v single power with 5v regulator, like 7905 series ics, for adc operation. ES5128 has a 19,999 counts resolution on both 200.00mv and 2.0000v ranges. it features high impedance inputs, excellent differential linearity, true ratiometric operation and auto polarity. the underrange and overrange outputs and the 10:1 range cha nging inputs facilitate the design of autoranging systems. other features include displa y hold and controllable decimal points.
v1.0 06/03/10 2 ES5128 4-1/2 digit with led pin assignment qfp-44l dig2 dig3 dig4 seg_a seg_b nc seg_c seg_d seg_e seg_f seg_g seg_dp vled gled iset dp4_or test2 dp3_ur hold v- v+ caz ref_lo ref_hi in_hi in_lo buffer nc cref- cref+ common nc cint dig1 dig0 n c osc3 osc1 test1 osc2 dp1 dp2 range dgnd 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 33 32 31 30 29 28 27 26 25 24 23 44 43 42 41 40 39 38 37 36 35 34 ES5128
v1.0 06/03/10 3 ES5128 4-1/2 digit with led pin description qfp-44l pin no symbol type description 1 dig2 o led backplane signal for dig2 2 dig3 o led backplane signal for dig3 3 dig4 o led backplane signal for most significant digit 4 seg_a o led segment signal for all a segments 5 seg_b o led segment signal for all b segments 6nc 7 seg_c o led segment signal for all c segments 8 seg_d o led segment signal for all d segments 9 seg_e o led segment signal for all e segments 10 seg_f o led segment signal for all f segments 11 seg_g o led segment signal for all g segments 12 seg_dp o led segment signal for all decimal point segments 13 vled p positive power supply for led driver circuit 14 gled p negative power supply for led driver circuit 15 iset o adjust the bright(current) of led segment. 16 dp4_or i/o input: turns on most significant decimal point when hi. output: pulled hi when result count exceeds 19,999. 17 test2 - test pin. not connect. 18 dp3_ur i/o input: turn on the 2 nd significant decima l point when hi. output: pulled hi when resu lt count is less than 1,000. 19 hold i/o input: when floating, ES5128 operates in the free-run mode. when pulled high, the last display reading is held. when pulled lo, the result c ounter contents are shown incrementing during the de-integrate phase of cycle. output: negative going edge occurs when the data latches are upgraded. can be used as a converter status signal. 20 v- p negative power supply terminal 21 v+ p positive power supply terminal 22 caz i/o integrator amplifier input 23 cint i/o integrator amplifier output 24 nc 25 common o set common-mode voltage of 3.2v below v+. 26 cref+ o positive connection to ex ternal reference capacitor 27 cref- o negative connection to external reference capacitor 28 nc 29 buffer o buffer amplifier output 30 in_lo i negative input voltage terminal 31 in_hi i positive input voltage terminal 32 ref_hi i positive reference voltage terminal 33 ref_lo i negative reference voltage terminal 34 dgnd o ground reference for digital section
v1.0 06/03/10 4 ES5128 4-1/2 digit with led 35 range i pulled high externally for 2v scale. 36 dp2 i when hi, decimal point 2 will be on. 37 dp1 i when hi, decimal point 1 will be on. 38 osc2 i/o output of first clock inverter. input of second clock inverter. 39 test1 - test pin. not connect. 40 osc1 i/o input of first clock inverter. 41 osc3 o output of second clock inverter. 42 nc 43 dig0 o led backplane signal for dig0 44 dig1 o led backplane signal for dig1 absolute maximum ratings characteristic rating supply voltage (v+ to v-) 15v a nalog input voltage v- -0.6 to v+ +0.6 d igital input dgnd -0.6v to v+ +0.6v p ower dissipation. flat package 500mw operating temperature 0 to 70 storage temperature -25 to 125 electrical characteristics ta=25 , 10v between v+ and v- parameter test condition min. typ. max units zero input reading vin=0, 200mv scale -1 0 1 counts ratiometric reading vin=vref=1v range=2v 9998 9999 10000 counts rollover error +vin=-vin=199mv 2 counts linearity error 200mv scale 1 counts common voltage v+ to common 2.8 3.2 3.5 v common sink current common=+0.1v 0.1 2 ma common source current common=-0.1v 10 200 a supply current excluding led display current v+ to v- = 10v 0.9 1.4 ma supply voltage range v+ to v- 7 10 14 v
v1.0 06/03/10 5 ES5128 4-1/2 digit with led function description 1. normal operation when ES5128 operates at the oscillation fr equency of 120khz, the conversion period will be 500ms. and the less frequency it has, the longer time it takes to complete one conversion. ES5128 takes input signal from pi ns in_lo and in_hi differentially, and take reference from pins ref_lo and ref_ hi. the typical reference voltage is about 1v. a filter capacitor and a protective resi stor are recommended at in_hi and in_lo terminal as the test circuit of page7. 2. range change function ES5128 has 2 operation ranges such as 200.00mv and 2.0000v. when the pin range is pulled to dgnd or keep floating, es 5128 operates at 200.00mv full-scale range. when it is pulled to v+, ES5128 change th e input full-scale range to 2.0000v. and the output data still remain the maximum counting number 19,999. 3. data hold function ES5128 support a data hold function to stop th e led panel upgrading and hold the final data. when the pin hold keeps floating, ES5128 operates in free run mode, and the data upgrades after every conversion. when it is pulled to v+, ES5128 enters hold mode, the led panel stops upgrading the outpu t data, and the final data before the hold mode is activated is held. 4. decimal points controlled ES5128 can drive 4 decimal points on led panel. it provides four pins dp1, dp2, dp3 and dp4 to control the decimal points. conn ect the pins dp1~dp4 to v+ will turn on the relative decimal points. to turn it of f, keep it floating or connect it to dgnd.
v1.0 06/03/10 6 ES5128 4-1/2 digit with led 5. led display configuration seg_a seg_b seg_c seg_d seg_e seg_f seg_g seg_dp dig0 0a 0b 0c 0d 0e 0f 0g dig1 1a 1b 1c 1d 1e 1f 1g dp1 dig2 2a 2b 2c 2d 2e 2f 2g dp2 dig3 3a 3b 3c 3d 3e 3f 3g dp3 dig4 4b 4c sign dp4
v1.0 06/03/10 7 ES5128 4-1/2 digit with led test circuit ? 120khz crystal oscillator dig2 (1) dig3 dig4 seg_a seg_b (5) nc seg_c seg_d seg_e seg_f (10) seg _ g seg_dp vled gled iset (15) dp4_or test2 dp3_ur hold v- (20) v+ caz ref_lo ref_hi in_hi (30) in_lo buffe r nc cref- cref+ (25) common nc cint dig1 dig0 nc osc3 (40) osc1 test1 osc2 dp1 dp2 (35) range dgnd ES5128 +5v +5v vin+ vin- 100k 150k 0.1 0.1 470n -5v 120k 1.2v 0.1 10k 20k 20k 50~100pf 5k
v1.0 06/03/10 8 ES5128 4-1/2 digit with led test circuit ? rc oscillation circuit dig2 (1) dig3 dig4 seg_a seg_b (5) nc seg_c seg_d seg_e seg_f (10) seg _ g seg_dp vled gled iset (15) dp4_or test2 dp3_ur hold v- (20) v+ caz ref_lo ref_hi in_hi (30) in_lo buffe r nc cref- cref+ (25) common nc cint dig1 dig0 nc osc3 (40) osc1 test1 osc2 dp1 dp2 (35) range dgnd ES5128 +5v vin+ vin- 100k 150k 0.1 0.1 470n 75k 50p 1.2v 0.1 10k 20k +5v -5v 20k 5k
v1.0 06/03/10 9 ES5128 4-1/2 digit with led test circuit ? single power operation dig2 (1) dig3 dig4 seg_a seg_b (5) nc seg_c seg_d seg_e seg_f (10) seg _ g seg_dp vled gled iset (15) dp4_or test2 dp3_ur hold v- (20) v+ caz ref_lo ref_hi in_hi (30) in_lo buffer nc cref- cref+ (25) common nc cint dig1 dig0 nc osc3 (40) osc1 test1 osc2 dp1 dp2 (35) range dgnd ES5128 +10v +10v vin+ vin- 100k 150k 0.1 0.1 470n 0v 1.2v 0.1 10k 20k 7905 ( 5v ) 120k 50~100pf 20k 5k
v1.0 06/03/10 10 ES5128 4-1/2 digit with led product outline : qfp-44
|
