1 description ltc 3305efe lead acid battery balancer demonstration circuit 2043 a is a lead acid battery balancer featuring the lt c ? 3305 . the ltc3305 balances up to 4 lead acid batteries connected in series and incorporates all voltage monitoring, gate drive and fault detection circuitry . the ltc3305 employs an auxiliary battery or an alternative storage cell to transfer charge to or from each individual battery within the stack. there are two operating modes, timer mode and continuous mode, selected by the mode pin. in timer mode, once the balancing operation is complete, the ltc3305 goes to a low power state for a programmed time and then periodically rebalances the l , lt, ltc, ltm, linear technology and the linear logo are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners. boar d p hoto batteries. in continuous mode, the balancing operation continues even after the batteries are balanced to their programmed termination voltage. the LTC3305EFE is available in a 7 mm 7mm 38-lead tssop surface mount package with exposed pad. design files for this circuit board are available at http://www .linear.com/demo/dc2043a figure 1. dc2043a demo board figure 2. thermal image of dc2043a dc2043af demo manual dc2043a
2 operatin g princip l e refer to the block diagram within the ltc3305 data sheet for its operating principle. the ltc3305 balances batteries using an auxiliary cell or an alternate storage cell as a charge reservoir. the ltc3305 controls external n channel mosfet switches in a preprogrammed sequence to connect a battery in the stack to an auxiliary cell. charge is transferred to or from the auxiliary cell when it is connected to a battery. the ltc3305 can operate in one of two modes, timer mode or continuous mode, programmable via the mode pin. balancing operation begins once the cboost capacitor is charged to at least 6.95 v. the en1 and en2 pins select the number of batteries in the stack. en1 en2 application 0 0 shutdown 0 1 2 battery stack 1 0 3 battery stack 1 1 4 battery stack with the mode pin set to 0 the ltc3305 will operate in the timer mode. the bal pin will be pulled low, indicating that the part is enabled and balancing the battery stack. the balancing operation begins with the terminal of the auxiliary cell connected to the negative terminal of bat 1, the lowest battery in the stack. the bottom switches that connect the negative terminals of bat 1 to the auxiliary cells negative terminal are turned on. after a 50 ms delay, the voltages across the auxiliary cell and bat 1 are com- pared by the termination sense comparator. if the voltage difference between the auxiliary cell and bat 1 is less than the selected termination voltage, the battery is deemed to be in a balance state with respect to the auxiliary cell. the bottom switches will be turned off and the next battery within the stack will be connected. if the voltage difference between the auxiliary cell and bat 1 is greater than the selected termination voltage, the top switches that connect the positive terminal of bat 1 to the auxiliary cells positive terminals through the ptc thermistor are turned on . current is limited by the pt c thermistor. figure 3 shows the startup battery current where the ptc is limiting as it heats up. figure 4 is the steady state battery current after the ptc has reached its thermal equilibrium. after a 50 ms delay, the termination sense comparator starts to monitor the voltage across the auxiliary cell and the battery. the battery will remain connected to the auxiliary cell until the voltage difference decreases to the selected termination voltage or a t bat timeout occurs. at this point all switches are turned off and the second battery in the stack will be connected to the auxiliary cell after a 50 ms delay. this 50 ms delay provides a break be - fore make function before the next battery is connect-ed. the cycle will be repeated for each batter y in the stack. p erformance s ummary specifications are at t a = 25c symbol parameter conditions min max units v bat battery voltage range 4.0 to 16.0 v v terminate termination voltage range term2 = 0, term1 = 0 5 to 20 mv v terminate termination voltage range term2 = 0, term1 = 1 17.5 to 32.5 mv v terminate termination voltage range term2 = 1, term1 = 0 42.5 to 57.5 mv v terminate termination voltage range term2 = 1, term1 = 1 90 to 110 mv v reg regulator output voltage range i vreg = 200a 2.4 to 2.6 v dc2043af demo manual dc2043a
3 operatin g princip l e 100ma/div bat current battery balancing current 0.25v differential between battery and aux battery dc2043a f03 100ma/div bat current battery balancing current 0.25v differential between battery and aux battery dc2043a f04 figure 3. start-up battery balancing current figure 4. steady state battery balancing current once all batteries in the stack are balanced the done pin is pulled low, the bal pin is in its high state and the ltc3305 is put into a low power off state. the stack is deemed balanced when for a four battery stack, the termination sense comparator detects v terminate on five consecutive cycles that connects each of the batteries to the auxiliary cell using the bottom switches only. in timer mode, the balancing operation continues for a maximum of the programmed t on time. after the t on time, ltc3305 is put into a low power off state for a programmed t off time, even though the batteries may not be balanced. once the t off time expires, the ltc3305 is put into the on state and normal operation resumes. the bal pin is in its high impedance state if the part is in the off state or when the part is in shutdown. with the mode pin set to 1, the ltc3305 will operate in the continuous mode. the part functions in much the same way as in the timer mode with the following differences. 1. there are no on or off states. the balancing operation continues even if the stack is in balance. the balanc- ing operation is terminated only if the part is put into shutdown. the bal pin is always pulled low. 2. in continuous mode, the top switches are turned on and balancing operation on a battery is terminated by the t bat time out. since the auxiliary cell remains connected to the battery until a t bat time out, its volt- age can change before it connects to the next battery in the stack. as a result, when the stack is balanced and the done pin is pulled low, the voltages across individual batteries in the stack may differ by more than the programmed v terminate . in the worst case, when the capacity of the auxiliary cell is much smaller than the battery, the individual battery voltages will differ by twice the programmed v terminate when balanced. the ltc3305 provides undervoltage and overvoltage threshold detection that can be programmed using resistors that are connected between the i set , vl and vh pins and ground. the voltages set on vl and vh are scaled by a factor of 10, setting the battery undervoltage and overvoltage thresholds, respectively. when an undervoltage or overvoltage fault condition is detected, the corresponding uvflt or ovflt pin is pulled low. the balancing operation is not interrupted during this time. if the fault condition goes away during balancing, the corresponding fault pin is put into its high impedance state . dc2043af demo manual dc2043a
4 q uic k start proce d ure using short twisted pair leads for any power connections, with all loads and power supplies off, refer to figure 5 for the proper measurement and equipment setup. follow the procedure below: 1. before connecting ps1-ps5 to the dc2043a, the power supplies must have its current limit set to 5a . for most power supplies with a current limit adjust - ment feature the procedure to set the current limit is as follows. turn the voltage and current adjustment to minimum. short the outputs terminals and turn the voltage adjustment to maximum. adjust the current limit to 5 a for ps1. turn the voltage adjustment to minimum and remove the short between the output terminals. repeat for ps2-ps5 the power supplies are now current limited to 5a . a. initial jumper and ps settings: jp1(mode) = cont jp2 (en) = sd jp3(term1) = 1 jp4 (term2) = 1 ps1 = off ps2 = off ps3 = off ps4 = off ps5 = off ps6 = off 2. connect power supplies, load resistors and meters as shown in figure 5. turn on ps1 and slowly increase voltage to 2.0 v while monitoring the input current. if the current remains less than 200 ma, increase ps1 to 12.0v. repeat for ps2-ps4. 3. turn on ps5 and slowly increase voltage to 2.0 v while monitoring the input current. if the current remains less than 200 ma, increase ps5 to 11.8 v. turn on ps6 and slowly increase voltage to 2.0 v while monitoring the input current. if the current remains less than 20ma, increase ps6 to 5.0v. 4. measure the voltage from the vreg turret to ground. the voltage should read approximately 2.6 v. measure the voltage from the boost test point to v4. the volt - age should read approximately 0 v. no led should be on. 5. set jp2 to en. measure the voltage from the boost test point to v 4. the voltage should read approximately 8.5v. 6. measure the voltage from the i set test point to ground. the voltage should read approximately 1.2v. 7. measure the voltage from the vh test point to ground. the voltage should read approximately 1.52v. 8. measure the voltage from the vl test point to ground. the voltage should read approximately 0.95v. 9. with jp1 set to cont, jp2 set to en, jp3 set to 1 and jp4 set to 1, observe that the batx and baty leds are cycling through their four states. batx led b at y led active battery off off bat 1 off on bat 2 on on bat 3 on off bat 4 10. decrease ps1 and ps5 to 9.4 v and observe that while the batx and baty are off, the uvflt led is on. 11. increase ps1 and ps5 to 15.9 v and observe that while the batx and baty are off, the ovflt led is on. decrease ps1and ps2 to 12.0v. 12. decrease ps2 to 11.5 v. set jp1 to timer. observe that the batx led is off and baty led is on the ma - jority of the time . increase ps2 to 12 v and observe that the balancing action stops. the bal led will be off and the done led will be on. 13. set jp1 to cont and jp2 to sd. set ps5 to 11.8v. observe that balancing action has stopped and no leds are on. set jp2 to en and observe that balancing action starts. 14. turn off all power supplies dc2043af demo manual dc2043a
5 q uic k start proce d ure 10 25w 5v ps5 + ps4 + ps3 + ps2 + ps1 + 10 25w 10 25w 10 25w 5 50w ps6 + figure 5. proper measurement equipment set-up dc2043af demo manual dc2043a
6 p arts list item qty reference part description manufacturer/ part number required circuit components 1 4 c1-c4 cap.,x7r, 4.7f, 25v, 20%, 0805 tdk, c2012x7r1e475m 2 7 c5, c6, c12-c16 cap.,x7r, 10f, 25v, 20%, 1206 murata, grm31cr71e106ka12 3 1 c7 cap.,c0g, 0.033f, 50v, 5%, 0805 tdk, cga4j2c0g1h333j125aa 4 2 c8, c9 cap.,c0g, 0.01f, 50v, 5%, 0805 tdk, cga4c2c0g1h103j060aa 5 1 c10 cap., x7r, 1.0f, 16v, 10%, 0603 murata, grm188r71c105ka12d 6 2 d1-d2 smd, schottky diode, 1a, 100v, sod123 central semi, cmmsh1-100g 7 10 q1-q3_1, q3_2, q4-q9 mosfet, 100v, 0.009, 60a,powerpak-so-8 vishay, sir882dp 8 8 r1, r2, r4-r9 res, chip, 6.04k, 1/16w, 1%, 0402 vishay, crcw04026k04fked 9 1 r3 res, chip, 3.01k, 1/16w, 1%, 0402 vishay, crcw04023k01fked 10 2 r10, r11 res, chip,12.1k, 1/8w, 1%, 0805 vishay, crcw080512k1fked 11 7 r12-r18 res, chip, 10.0, 1/16w, 1%, 0402 vishay, crcw040210r0fked 12 2 r19, r34 res, chip, 665, 1/2w, 1%, 1210 vishay, crcw1210665rfked 13 1 r20 res, chip, 12.1k, 1/16w, 1%, 0402 vishay, crcw040212k1fked 14 1 r21 res, chip, 46.4k, 1/16w, 1%, 0402 vishay, crcw040246k4fked 15 1 r22 res, chip, 28.7k, 1/16w, 1%, 0402 vishay, crcw040228k7fked 16 4 r30-r33 res, chip, 1.82m, 1/16w, 1%, 0402 vishay, crcw04021m82fked 17 1 r35 res, chip, 249, 1/4w, 1%, 1206 vishay, crcw1206249rfked 18 1 rt 1 disc , th, ptc , 0.15, 16v, 10.1mm dia, murata, ptglesarr15m1b51b0 19 1 u1 ic,smt, lead acid battery balancer/efe linear, LTC3305EFE#pbf additional demo board circuit components 1 1 c11 cap., x7r, 4.7f, 25v, 20%, 0805 tdk, c2012x7r1e475m 2 3 d3, d6, d7 smd, red led, 0603 lite on, ltst-c193krkt-5a 3 4 d4, d5, d8, d9 smd, green led, 0603 lite on, ltst-c193kgkt-5a 4 4 f1-f4 smd, fuse, 7a, fast acting, 1206 32vdc bussmann, 3216ff7-r 5 6 f5-f10 smd, fuse, 1/4a, fast acting, 1206 32vdc bussmann, 3216ff250-r 6 1 q10 mosfet, p-channel, 20v, 0.085, 0.95asot-23 central semi, cmpdm8120 7 7 r23-r29 res, chip, 1.00k, 1/16w, 1%, 0402 vishay, crcw04021k00fked 8 1 r36 res, chip, 100k, 1/16w, 1%, 0402 vishay, crcw0402100kfked 9 7 r37-r43 res, chip, 2.00k, 1/16w, 1%, 0402 vishay, crcw04022k00fked hardware: for demo board only 1 7 e1-e7 turret, 0.061" mill-max, 2308-2-00-80-00-00-07-0 2 17 e8-e24 turret, 0.09" mill-max, 2501-2-00-80-00-00-07-0 3 4 jp1-jp4 header, 3pins, 2mm samtec, tmm-103-02-l-s 4 4 jp1-jp4 shunt 2mm samtec, 2sn-bk-g 5 6 stand-off, nylon 0.375" tall keystone, 8832 (snap on) dc2043af demo manual dc2043a
7 information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. s chematic dia g ram term1 term2 en mode 0 0 sd timer 1 1 en cont. done bal uvflt ovflt baty batx ptcflt notes: unless otherwise specified 1. all resistors are in ohms, 0402, 1%, 1/16w. 3. install shunts on jumpers as shown. 2. all capacitors are in microfarads, 0805, 20%, 25v. 3.3v - 5.5v 9.5v-15.5v 9.5v-15.5v 9.5v-15.5v 9.5v-15.5v 9.5v-15.5v 2.5v on off off off on 0 0 0 1 1 1 1 term1 term2 0 12.5mv 25mv 50mv termination voltage 100mv battery being balanced battery 1 battery 2 battery 3 battery 4 on off on batx led baty led bat3_k bat4_k ng5 ng4 ng3 ng2 ng6 ng7 ng1 ng9 ng8 ng1 ng2 ng3 ng4 ng5 ng6 ng7 ng8 ng9 bat4 bat4 vreg bat3 ptcfltb doneb balb uvfltb ovfltb baty batx ptcfltb doneb balb uvfltb ovfltb baty batx bat2_k gnd balb gnd_k gnd_k gnd_k bat1 gnd_k auxp_k auxn_k bat1_k gnd_k bat2 bat1_k bat2_k bat3_k bat4_k size date: .ver .on ci sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 3 demo circuit 2043a 1 1 lead acid battery balancer n/a LTC3305EFE nc jd 9 - 23 - 14 size date: .ver .on ci sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 3 demo circuit 2043a 1 1 lead acid battery balancer n/a LTC3305EFE nc jd 9 - 23 - 14 size date: .ver .on ci sheet of title: approvals pcb des. app eng. technology fax: (408)434-0507 milpitas, ca 95035 phone: (408)432-1900 1630 mccarthy blvd. ltc confidential-for customer use only customer notice linear technology has made a best effort to design a circuit that meets customer-supplied specifications; however, it remains the customer's responsibility to verify proper and reliable operation in the actual application. component substitution and printed circuit board layout may significantly affect circuit performance or reliability. contact linear technology applications engineering for assistance. this circuit is proprietary to linear technology and schematic supplied for use with linear technology parts. scale = none www.linear.com 3 demo circuit 2043a 1 1 lead acid battery balancer n/a LTC3305EFE nc jd 9 - 23 - 14 revision history description date approved eco rev jd production fab 41 - 32 -9 3- revision history description date approved eco rev jd production fab 41 - 32 -9 3- revision history description date approved eco rev jd production fab 41 - 32 -9 3- d2 cmmsh1-100g d2 cmmsh1-100g e20 bat2_k e20 bat2_k tp12 ng9 tp12 ng9 r25 1k r25 1k jp1 jp1 q4 sir882dp q4 sir882dp 6 4 2 3 1 8 5 7 r42 2k r42 2k r9 6.04k r9 6.04k e24 auxn_k e24 auxn_k e5 ovflt e5 ovflt d7 red led-ln d7 red led-ln r4 6.04k r4 6.04k r31 1.82m r31 1.82m q6 sir882dp q6 sir882dp 6 4 2 3 1 8 5 7 e22 gnd_k e22 gnd_k r34 665 1210 r34 665 1210 c8 10nf 50v 5% c8 10nf 50v 5% c10 1uf 16v 0603 10% c10 1uf 16v 0603 10% r21 46.4k r21 46.4k r14 10 r14 10 e10 bat4 e10 bat4 tp8 ng5 tp8 ng5 c3 4.7uf c3 4.7uf tp4 ctoff tp4 ctoff tp16 iset tp16 iset r7 6.04k r7 6.04k jp3 jp3 d3 red led-ln d3 red led-ln r2 6.04k r2 6.04k q7 sir882dp q7 sir882dp 6 4 2 3 1 8 5 7 e6 baty e6 baty q8 sir882dp q8 sir882dp 6 4 2 3 1 8 5 7 c5 10uf 1206 c5 10uf 1206 tp3 cton tp3 cton c1 4.7uf c1 4.7uf r26 1k r26 1k jp2 jp2 q3_2 sir882dp q3_2 sir882dp 6 4 2 3 1 8 5 7 q9 sir882dp q9 sir882dp 6 4 2 3 1 8 5 7 r43 2k r43 2k d4 grn led-ln d4 grn led-ln r32 1.82m r32 1.82m f2 7a 1206 f2 7a 1206 f7 1/4a 1206 f7 1/4a 1206 q2 sir882dp q2 sir882dp 6 4 2 3 1 8 5 7 c7 33nf 50v 5% c7 33nf 50v 5% d8 grn led-ln d8 grn led-ln c14 10uf 1206 c14 10uf 1206 r39 2k r39 2k r5 6.04k r5 6.04k r22 28.7k r22 28.7k tp18 cm tp18 cm tp2 ctbat tp2 ctbat tp9 ng6 tp9 ng6 e7 batx e7 batx q1 sir882dp q1 sir882dp 6 4 2 3 1 8 5 7 e19 bat3_k e19 bat3_k r17 10 r17 10 r12 10 r12 10 e14 gnd e14 gnd e2 done e2 done e8 auxp e8 auxp c4 4.7uf c4 4.7uf c6 10uf 1206 c6 10uf 1206 q3_1 sir882dp q3_1 sir882dp 6 4 2 3 1 8 5 7 r19 665 1210 r19 665 1210 r27 1k r27 1k f5 1/4a 1206 f5 1/4a 1206 r37 2k r37 2k q10 cmpdm8120 q10 cmpdm8120 r15 10 r15 10 tp5 ng1 tp5 ng1 r10 12.1k 0805 r10 12.1k 0805 f3 7a 1206 f3 7a 1206 u1 LTC3305EFE u1 LTC3305EFE mode 35 cp 37 cm 38 boost 1 v4 2 v3 3 auxp 4 auxn 5 v2 6 v1 7 ng1 8 ng2 9 ng3 10 ng4 11 ng5 12 ng6 13 ng7 14 ng8 15 nc 36 ng9 16 batx 17 baty 18 ovflt 19 uvflt 20 bal 21 done 22 ptcflt 23 ct bat 26 cton 25 ctoff 24 vl 27 vh 28 i set 29 vreg 30 term2 31 term1 32 en2 33 en1 34 gnd 39 d5 grn led-ln d5 grn led-ln tp17cp tp17cp e17 vreg e17 vreg r40 2k r40 2k tp14 vl tp14 vl d9 grn led-ln d9 grn led-ln tp10 ng7 tp10 ng7 d1 cmmsh1-100g d1 cmmsh1-100g e3 bal e3 bal e13 bat1 e13 bat1 r23 1k r23 1k e9 auxn e9 auxn r8 6.04k r8 6.04k r3 3.01k r3 3.01k f6 1/4a 1206 f6 1/4a 1206 t rt1 ptglesarr15m1b51b0 t rt1 ptglesarr15m1b51b0 1 2 r28 1k r28 1k c13 10uf 1206 c13 10uf 1206 e23 auxp_k e23 auxp_k f9 1/4a 1206 f9 1/4a 1206 e21 bat1_k e21 bat1_k r33 1.82m r33 1.82m tp1 boost tp1 boost e4 uvflt e4 uvflt tp6 ng2 tp6 ng2 r6 6.04k r6 6.04k r1 6.04k r1 6.04k tp13 ng3 tp13 ng3 e12 bat2 e12 bat2 jp4 jp4 e18 bat4_k e18 bat4_k e15 vext e15 vext tp11 ng8 tp11 ng8 d6 red led-ln d6 red led-ln r41 2k r41 2k f4 7a 1206 f4 7a 1206 r35 249 1206 r35 249 1206 r24 1k r24 1k f10 1/4a 1206 f10 1/4a 1206 r18 10 r18 10 r36 100k r36 100k r13 10 r13 10 r38 2k r38 2k r30 1.82m r30 1.82m tp15 vh tp15 vh c15 10uf 1206 c15 10uf 1206 c2 4.7uf c2 4.7uf c9 10nf 50v 5% c9 10nf 50v 5% c16 10uf 1206 c16 10uf 1206 c12 10uf 1206 c12 10uf 1206 r29 1k r29 1k e1 ptcflt e1 ptcflt r20 12.1k r20 12.1k c11 4.7uf c11 4.7uf tp7 ng4 tp7 ng4 f1 7a 1206 f1 7a 1206 f8 1/4a 1206 f8 1/4a 1206 e11 bat3 e11 bat3 r16 10 r16 10 r11 12.1k 0805 r11 12.1k 0805 e16 vext_rtn e16 vext_rtn q5 sir882dp q5 sir882dp 6 4 2 3 1 8 5 7 dc2043af demo manual dc2043a
8 linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax : (408) 434-0507 www.linear.com linear technology corporation 2014 lt 1214 ? printed in usa demonstration board important notice linear technology corporation ( lt c ) provides the enclosed product(s) under the following as is conditions: this demonstration board ( demo board) kit being sold or provided by linear technology is intended for use for engineering development or evaluation purposes only and is not provided by lt c for commercial use. as such, the demo board herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. as a prototype, this product does not fall within the scope of the european union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations. if this evaluation kit does not meet the specifications recited in the demo board manual the kit may be returned within 30 days from the date of delivery for a full refund. the foregoing warranty is the exclusive warranty made by the seller to buyer and is in lieu of all other warranties, expressed, implied, or statutory, including any warranty of merchantability or fitness for any particular purpose. except to the extent of this indemnity, neither p arty shall be liable to the other for any indirect, special, incidental, or consequential damages. the user assumes all responsibility and liability for proper and safe handling of the goods. further, the user releases lt c from all claims arising from the handling or use of the goods. due to the open construction of the product, it is the users responsibility to take any and all appropriate precautions with regard to electrostatic discharge. also be aware that the products herein may not be regulatory compliant or agency certified (fcc, ul, ce, etc.). no license is granted under any patent right or other intellectual property whatsoever. lt c assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. lt c currently services a variety of customers for products around the world, and therefore this transaction is not exclusive. please read the demo board manual prior to handling the product . persons handling this product must have electronics training and observe good laboratory practice standards. common sense is encouraged. this notice contains important safety information about temperatures and voltages. for further safety concerns, please contact a lt c applica- tion engineer. mailing address: linear technology 1630 mccarthy blvd. milpitas, ca 95035 copyright ? 2004, linear technology corporation dc2043af demo manual dc2043a
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