SC7001Q 33/4 DIGITS LCD DISPLAY ,3260-COUNT A/D FOR DMM DESCRIPTION The SC7001Q is a low power CMOS dual-slope A/D converter with 3 3/4-digit numeric and 33-segment bar-graph LCD display driver, autoranging, and single 3V battery operation. It is ideal for high performance auto-range DMM applications with 3260 counts full-scale. The SC7001Q provides many user function: Manual Range Hold/Data Hold/Auto Power-off/Voltage/Current/Resistance measurement/Diode QFP-80-14×20-0.8 Test/Continuity Check(Beeper). The built-in high temperature-stable CMOS bandgap reference and a CMOS Op Amp for ac-to-dc conversion are economical of saving external components. In addition, the voltage doubler enables a high performance digital multimer to be built with single 3V power supply operation. FEATURES ORDERING INFORMATION Part no. Package SC7001Q QFP-80-14X20-0.8 * Auto range function --Voltage (DC/AC):326.0mV(NA for AC), 3.260V, 326.0V, 3260V --Resistance: 326.0Ω,3.260kΩ, 32.60kΩ, 326.0kΩ, 3.260MΩ, 32.60 MΩ -- Current (DC/AC): 326.0μA, 3260μA, 32.60mA, 326.0mA, 10A * Triplex LCD driver including decimal points, bargraph, and annunciators * Low power consumption: less than 1.8mW. APPLICATIONS ∗ Hand-held DMM * Pocket DMM * Pen-type DMM * 3V battery operation. * Internal voltage doubler, ac-to-dc conversion Op Amp. * Range Selection/Display Hold/Auto Power-off/Diode Test/Continuity Check(Beeper) function * Built-in CMOS bandgap reference. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.2 2007.12.26 Page 1 of 17 SC7001Q BLOCK DIAGRAM 1. Analog block 2. Digital block HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.2 2007.12.26 Page 2 of 17 SC7001Q ABSOLUTE MAXIMUM RATING (note1) Symbol Value Unit Supply Vltage (VDD to A COM) Characteristics VDD 4 V Supply Vltage (VSS to A COM) VSS -4 V Digital Input Voltage DVIN -0.3~VDD+0.3 V Analog Input Voltage AVIN VSS-0.3~VDD+0.3 V Digital Output Current DIOUT -1~+1 mA Analog Output Current AIOUT -3~+3 mA Beep Output Current IBEEP -1~+1 mA LCD Output Current ILCD -0.1~+0.1 mA Operating Temperature Range TOPR 0~+50 °C Storage Temperature Range TSTG -40~+125 °C Note: 1. All voltage are measure with respect to the A COM, unless otherwise noted. The separate A GND, D GND and A COM should always be wired together. RECOMMENDED OPERATING CONDITIONS Characteristics Symbol Value Min. Typ. Max. Unit Supply voltage VDD 2.4 3.0 3.6 V Supply voltage VSS -2.4 -3.0 -3.6 V Digital input “L” voltage DVIL 0.5 V Digital input “H” voltage DVIH Reference input voltage REF IN LCD-ON drive voltage VLCD-ON LCD-OFF drive voltage VLCD-OFF Operating temperature range Clock frequency VDD-0.5 V 0.32768 V 2.5 Topr V 0 f 1.3 V 50 °C 32.768 KHz ELECTRICAL CHARACTERISTICS (Tamb=25°C, VDD=3V, REF IN=0.32768V, f =32.768KHz,unless otherwise specified) Characteristics Symbol Test conditions Min. Typ. At DCV mode, VIN=0mV with Supply current IDD Power-off supply current IPO At power off(down) Digital input “H” current IIH VIH =3V -1.0 Digital input “L” current IIL VIL=0V -10 Measuring pin leakage ILEAK -10 Digital input “H” voltage VIH 2.5 Digital input “L” voltage VIL voltage doubler operated 0 Max. Unit 600 μA 4.0 μA +1.0 μA μA +10 pA 0.5 V V (To be continued) HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.2 2007.12.26 Page 3 of 17 SC7001Q (Continued) Characteristics Built-in reference voltage output range Built-in reference voltage output voltage coefficient Battery check internal comparator off-set voltage Symbol REF OUT ΔREF OUT VDD=2.4~3.6V VBATT LCD-on drive voltage VLCD-ON LCD-off drive voltage VLCD-OFF Linearity DCV measurement Test conditions On pin 47 voltage Min. Typ. Max. Unit 1.1 1.28 1.4 V -2000 +2000 ppm/V -60 +60 2.5 V 1.3 ERR-DCV mV V -0.08 +0.08 %/FS DCA measurement ERR-DCA -0.15 +0.15 %/FS ACV measurement ERR-ACV -0.1 +0.1 %/FS ACA measurement ERR-ACA -0.2 +0.2 %/FS Except 32.6MΩ -0.08 +0.08 %/FS 32.6MΩ range -0.5 +0.5 %/FS %/FS Resistance measurement Diode test ERR-R -0.2 +0.2 ERR-OPT -0.08 +0.08 %/FS Beep out frequency fBEEP 4095 Continuity check value RCC 18.3 Option measurement AC-to-DC conversion Amp gain O.L display count ERR-D AV Full-scale =2.0V Input range = -1~1v D O.L HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn 4096 70 3240 REV:1.2 4097 Hz 20.7 Ω dB 3290 count 2007.12.26 Page 4 of 17 SC7001Q PIN CONFIGURATION HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.2 2007.12.26 Page 5 of 17 SC7001Q PIN DESCRIPTION PIN No. Symbol 1 BP1 2~27 SDP1~SDP26 28 LOWBAT Low battery check voltage input 29 PWRMON Power monitor output 30 AUTO PWR1 Auto power ON/OFF selection 1 31 AUTO PWR2 Auto power ON/OFF selection 2 32 VDD 33 CINTH 34 CAUTO ZERO(H) Description Backplane 1 of LCD display Segment display Supply voltage High-speed A/D integrating capacitor connection High-speed A/D auto zero capacitor connection 35 RINTH(H) High-speed A/D integrating resistor connection(H) 36 RINTH(L) High-speed A/D integrating resistor connection(L) 37 A COM Analog circuit reference voltage 38 REF IN Reference voltage input 39 AC AMP OUT Built-in AC Amp output 40 AC AMP IN(-) Built-in AC Amp negative input 41 AC CKT IN (+) AC measurement position input 42 CFILT OUT 43 CFILT IN 44 AC CKT IN(-) 45 A GND 46 NC 47 REF OUT 48 CINTL 49 CAUTO ZERO(L) Output pin for external filter Input pin for external filter AC measurement negative input Analog ground No connection. This pin should be open in normal operation Built –in bandgap reference voltage output Low-speed A/D integrating capacitor connection Low-speed A/D auto zero capacitor connection 50 RINTL(L) Low-speed A/D integrating resistor connection (L) 51 RINTL(H) Low-speed A/D integrating resistor connection (H) 52 R MEAS IN Resistor and current measurement input 53 D MEAS IN Diode and current of high range measurement pin 54 I MEAS IN Input for current measurement 55 V MEAS IN Input for voltage measurement 56 1.1111MΩ Voltage measurement ÷ 10 attenuator(326.0kΩ range) 57 101.01KΩ Voltage measurement ÷ 100 attenuator(32.60kΩ range) 58 10.010 KΩ Voltage measurement ÷ 1000 attenuator(3.260kΩ range) 59 1.0001KΩ Voltage measurement ÷ 1000 attenuator(326.0Ω range) 60 10.000MΩ Resistance measurement 3.260MΩ range 61 RREF COM 62 VSS Attenuator resistor common connection Negative supply voltage connection of analog circuit (To be continued) HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.2 2007.12.26 Page 6 of 17 SC7001Q (Continued) PIN No. Symbol Description 63 D GND Digital ground 64~72 F1~F9 Function input pin 1~9 73 CVD OUT Voltage double output 74 CVD(-) Voltage double capacitor connection (-) 75 CVD(+) Voltage double capacitor connection(+) 76 OUT 77 OSC OUT 78 OSC IN 79 BP2 Backplane 2 of LCD display 80 BP3 Backplane 3 of LCD display Beep frequency output (4096Hz) X-tal connection (32.768KHz) X-tal connection FUNCTIONAL DESCRIPTION 1. SC7001Q INTEGRATING DUAL-SLOPE A/D CONVERTER The SC7001Q consists of a low-speed A/D and a high-speed A/D conversion circuit. Low-speed A/D conversion circuit When an analog DC input signal under 320mV is applied, the low-speed conversion proceeds like a sequence of AUTO ZERO (A.Z)→INTEGRATION (INT) →DEINTEGRATION (DEINT) → AUTO ZERO. One conversion takes 519.7ms is the voltage measurement mode. The counter data of DEINTEGRATION interval is transferred to the LCD and the output value is determined. High-speed A/D conversion circuit Range selection and barograph display operate by the high-speed conversion which is like that of low-speed A/D conversion. One conversion takes 80ms in the voltage measurement mode. Waveform and block diagram of dual-slope A/D converter (Negative input) Conversion time Tim Conversion time T1 T2 T3 Low-speed A/D 100ms 200ms 219.7ms(109.8ms)* 519.7ms(409.8ms) High-speed A/D 40ms 20ms 20ms(10ms) 80ms(70ms) Speed T1+T2+T3 * : The value of parenthesis is for current measurement mode. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.2 2007.12.26 Page 7 of 17 SC7001Q 2. VOLTAGE MEASUREMENT In the voltage measurement mode, input impedance is very high because input signal is applied to the integrator through a internal buffer amplifier. Ranges are automatically changed by internal switch select a proper route and attenuate an unknown voltage input to the ratio of 1/1, 1/10, 1/100, 1/1000, 1/10000. 1.1111MΩ, 101.10KΩ, and 1.0001KΩ of attenuator resistors are connected to 10MΩ resistor tandemly. Range Attenuator (in tandem) Attenuation ratio Resolution 326.0(R1) 10 1 0.1mV 3.260(R2) 10M&1.1111MΩ 1/10 1 mV 32.60(R3) 10M&101.01KΩ 1/100 10 mV 326.0(R4) 10M&10.01KΩ 1/1000 100 mV 3260(R15) 10M&1.0001KΩ 1/10000 1V Counter Timer Rint Vout INT 3277 200.0ms 327kΩ (Vin • Tint)/(R • Cint) DEINT 3600 219.7ms 327 kΩ VOUT-(Vref •Tdeint)/(R• Cint) 3. CURRENT MEASUREMENT Input terminals consist of μA, mA, and 10A ranges consist of two auto ranges according to the level of the input. Input terminal Range Internal switch Attenuation ratio Resolution μA 326.0μA S 1 0.1μA 3260μA S 1/10 1μA 32.60 mA S 1 10μA 326.0 mA S 1/10 1μA 10A S mA 10A HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.2 2007.12.26 Page 8 of 17 SC7001Q Counter Timer Rint INT 3277 200.0ms 327kΩ DEINT 3600 109.8ms 327kΩ Vout VOUT-(Vref •Tdeint/2)/(R• Cint) 4.RESISTANCE CONTINUITY MEASUREMENT In the resistance measurement mode, each attenuation resistor is connected to a 10MΩ resistor parallelly. 10M 100K s 1.28V Rk REF IN 1K INT R MEAS IN 900K DEINT DUAL SLOPE A/D Rx Range Resistance Except 32.60MΩ 32.60 MΩ Counter Time INT 3277 200.0ms 327 kΩ DEINT 3600 129.7ms 1 MΩ INT 3050 186.0ms 1 MΩ DEINT 3600 219.7ms 327 kΩ Continuity Rint Same as 326.0Ω range 5. DIODE TEST In the diode test mode, if an input voltage is over 2.01V(201counts) then “O.L” is displayed in the LCD and any more measurement is impossible. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.2 2007.12.26 Page 9 of 17 SC7001Q FUNCTION AND RANGE TABLE 1. When F5=0 R1, R2, R3, R4, R5, R32M, DP1 DP3 DP2 DP1 DP3 DP2 DC/AC VOLT • • • • • × DC/AC VOLT • • • • • × 0 DC/AC VOLT • • • • • × No F2 F1 F4 F3 F9=1/ F9=0 1 0 0 0 0 2 0 0 0 1 3 0 0 1 Remark TPD 4 0 0 1 1 OHM/Contiuity • • × × × × F8=0,F9:T 5 0 1 0 0 OPTION only × × × × × × 326m VOLT 6 0 1 0 1 DC VOLT • • • • • × 7 0 1 1 0 DC VOLT • • • • • × Contiuity 8 0 1 1 1 F9=1, F7:T 9 1 0 0 0 LCD test × × × × × × 10 1 0 1 0 CD/AC VOLT • • • • • × 11 1 0 1 1 OHM • • • • • • F6=1 • • • • • × F6=0 12 1 1 0 0 OPTION × × × × × × 326m VOLT 13 1 1 0 1 DC/AC mA × × • • × × 14 1 1 1 0 DC/AC μA × × × • • × 15 1 1 1 1 DC/AC VOLT • • • • • × /Diode Display 1999 * R1~R5: Range 1~Range 5. * R32M: R32M is 32MΩ range of resistance measurement. * DP1~DP3: Dot point 1, 2, 3 on the LCD. * F7: Manual Range Hold (to release ‘RH’, F7=0 during over 1sec). * F8: Data Hold (by toggling). * F5: Mode can be changed by a toggle switch with F9 (F9=1→0) when F5=0. Mode can be changed by a touch switch with F9 (F9=1→0→1). * TPD: Auto power off time (10 minutes). * F1~F9: Initial state using internal pull up (DC 326.0mV Range) . So every function pin (F1~F9) is “1” state unless certain input is given. * T: Toggle. 2. When F5=1 R1, R2, R3, R4, R5, R32M, DP1 DP3 DP2 DP1 DP3 DP2 DC/AC VOLT • • • • • × 1 DC/AC VOLT • • • • • × 0 DC/AC VOLT • • • • • × OHM • • • • • • CONTINUITY • × × × × × F9:T DIODE × • × × × × F9:T CONTINUITY • × × × × × DIODE × • × × × × No F2 F1 F4 F3 F9=1/ F9=0 16 0 0 0 0 17 0 0 0 18 0 0 1 19 20 0 0 0 1 1 1 1 1 HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.2 Remark TPD F9:T 2007.12.26 Page 10 of 17 SC7001Q 3. Auto power off function Power turned off by 10 minutes unless input value changed within a defined time. * This function selected as follows. Auto PWR1(Pin30) + Auto 0+0 1+0 0+1 1+1 Power on Auto power off Off Off PWR2(PIN31) POWER 4.Full display value according to mode Mode Voltage DC R1 R2 R3 R4 R5 326.0mV 3.260V 32.60V 326.0V 3260V 3.260V 32.60V 326.0V 3260V 32.60mA 326.0mA AC Current mA (AC/CD) μA Resistance(Ω) 326.0 3.260K 32.60K 326.0μA 3260μA 326.0K 3.260M R32M 32.60M DP3 of R4 is not displayed under voltage, current mode. LCD DRIVE WAVEFORM BACKPLANE 1 BACKPLANE 2 3V 2V BACKPLANE 3 1V D GND SEGMENT ON 3V D GND 256/6=42.67Hz 2V SEGMENT OFF HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn 1V REV:1.2 2007.12.26 Page 11 of 17 SC7001Q LCD DISPLAY AC R-H mV MK D-H DC dp3 p0 dp2 dp1 p- p33 TRIPLEXED LCD DISPLAY FORMAT IC PIN BP NO 2 3 4 5 6 7 8 9 10 11 12 13 14 d0 p30 dp1 d1 p29 dp2 d2 p28 dp3 NO BP2 79 p31 Ω K BP3 80 p32 V M c0 g0 e0 c1 g1 e1 c2 g2 e2 c3 BP1 1 p33 R-H m b0 a0 f0 b1 a1 f1 b2 a2 f2 b3 15 16 17 18 19 20 21 22 23 24 25 26 27 AC p27 p22 p21 p16 p15 p10 p9 p4 p3 p- D-H p26 p23 p20 p17 p14 p11 p8 p5 p2 p0 DC p25 p24 p19 p18 p13 p12 p7 p6 p1 IC PIN BP NO NO BP2 79 d3 BP3 80 e3 BP1 1 a3, ⎯ g3 HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.2 2007.12.26 Page 12 of 17 SC7001Q TYPICAL APPLICATION CIRCUIT HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.2 2007.12.26 Page 13 of 17 SC7001Q COMPONENT VALUE No Value Unit No Value Unit R1 9900 KΩ C1 0.022 μF R2 909 KΩ C2 0.022 μF R3 100 KΩ C3 10 μF R4 900 KΩ C4 10 μF R5 1.1 MΩ C5 10 pF R6 101.01 KΩ C7 0.015 μF R7 10.01 KΩ C8 0.22 μF R8 1.001 KΩ C9 10 μF C10 0.1 μF R9 10 MΩ C11 0.0068 μF R10 100 KΩ C12 0.15 μF R11 470 KΩ C13 1 μF R12 0.1 MΩ C14 10 μF R13 100 KΩ VR1 20 KΩ R14 160 KΩ VR2 200 KΩ R15 150 KΩ VR3 500 Ω R16 324 KΩ R17 1 MΩ D1 1N4148 R18 8.2 KΩ D2 1N4148 R19 100 KΩ D3 1N4148 R20 10 KΩ D4 1N4148 R21 10 KΩ D5 1N4148 R22 100 KΩ D6 1N4148 D7 1N4148 R27 50 KΩ R28 150 KΩ Q1 C2500 R32 39 Ω Q2 C2500 R33 495 Ω Q3 C945 R34 4.995 Ω X-Tal 32768 R36 324 KΩ R37 990 KΩ Z1 ZENAMIC 220 HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn Hz REV:1.2 2007.12.26 Page 14 of 17 SC7001Q TEST CIRCUIT HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.2 2007.12.26 Page 15 of 17 SC7001Q PACKAGE OUTLINE QFP-80-14×20-0.8 UNIT: mm 23.9±0.4 3.35MAX 0.8±0.2 20.0±0.2 12.0 16.3±0.4 14.0±0.2 17.9±0.4 0.05MIN 1 0.15±0.05 0.35 0.80 HANDLING MOS DEVICES: Electrostatic charges can exist in many things. All of our MOS devices are internally protected against electrostatic discharge but they can be damaged if the following precautions are not taken: • Persons at a work bench should be earthed via a wrist strap. • Equipment cases should be earthed. • All tools used during assembly, including soldering tools and solder baths, must be earthed. • MOS devices should be packed for dispatch in antistatic/conductive containers. HANGZHOU SILAN MICROELECTRONICS CO.,LTD Http: www.silan.com.cn REV:1.2 2007.12.26 Page 16 of 17