CS289 CS289 20mA Air-Core Tachometer Drive Circuit Description The CS289 is specifically designed for use with air-core meter movements. The IC has charge pump circuitry for frequency-to-voltage conversion, a shunt regulator for stable Features operation, a function generator, and sine and cosine amplifiers. The buffered sine and cosine outputs will typically sink or source 20mA. ■ Single Supply Operation ■ On-Chip Regulation ■ 20mA Output Drive Capability Absolute Maximum Ratings Supply Voltage (VCC)......................................................................................20V Operating Temperature ............................................................Ð40¡C to +100¡C Junction Temperature..................................................................Ð40¡C to 150¡C Storage Temperature.................................................................Ð65¡C to +150¡C Lead Temperature Soldering Wave Solder (through hole styles only)...........10 sec. max, 260¡C peak Reflow (SMD styles only)............60 sec. max above 183¡C, 230¡C peak Package Options Block Diagram 14L PDIP VZ Pwr Gnd VCC VCOS VREG SQIN SQOUT Regulator F/V OUT Charge Pump Pwr Gnd 1 VCC VSINE NC VCOS VBIAS VREG CPÐ SQIN CP+ SQOUT Gnd F/VOUT 20L SOIC Wide (internally fused leads) VCC VZ 1 Function Ð + Generator VZ VSINE VBIAS C pÐ C P+ Gnd VSINE VCOS VBIAS VREG Gnd Gnd Gnd Gnd Gnd Gnd Gnd Gnd CPÐ SQIN CP+ SQOUT NC F/VOUT Cherry Semiconductor Corporation 2000 South County Trail, East Greenwich, RI 02818 Tel: (401)885-3600 Fax: (401)885-5786 Email: [email protected] Web Site: www.cherry-semi.com Rev. 3/8/99 1 A ¨ Company CS289 Electrical Characteristics: (VCC = 13.1V, -30¡C ² TA² 85¡C) PARAMETER TEST CONDITIONS Supply Current (Note 2) MIN TYP VCC = 15.0V VCC = 13.1V VCC = 11.3V Regulated Voltage IREG = 4.3mA Regulation IREG = 0 to 5mA MAX UNIT 54 60 60 65 65 mA mA mA 8.5 9.3 V 0.10 0.20 V 2.0 4.0 mA 0.20 0.55 V 10 µA 1 15 nA 7.7 Signal Input Current T = 25¡C Saturation Voltage ISQ OUT = 5mA, ISQ IN = 500µA Leakage Current ISQ OUT = 16V, VSQ IN = 0V Input Current CP+ = 0, T = 25¡C F to V Output VSQIN = 0 (zero input), Æ = 0¡ 1.8 2.1 2.4 VCOS = 0 (Note 1), Æ = 270¡ 6.3 7.1 7.9 V EO vs. Frequency VCOS = 0 (Note 1), Æ = 270¡, T = 25¡C -1.5 1.5 % Vsine at Æ = 0¡ VSQ IN = 0 (zero input), Æ = 0¡ -0.55 0.00 0.55 V MAX Vsine+ VCOS = 0 (Note 1), Æ=90¡ 3.8 4.5 5.8 V MAX Vsine- VCOS = 0 (Note 1), Æ = 270¡ -3.8 -4.5 -5.8 V Coil Drive Current VCOS = 0 (Note 1), Æ = 90¡, T = 25¡C 20 25 mA VCOS = 0 (Note 1), Æ = 270¡ 20 25 mA Linearity 0.1 MAX VCOS+ VSQ IN = 0 (zero input), Æ = 0¡ 3.8 4.5 5.8 V MAX VCOS- Vsine = 0 (Note 1), Æ = 180¡ -3.8 -4.5 -5.8 V Coil Drive Current VSQ IN = 0 (zero input), Æ = 0¡ 20 25 mA Vsine = 0 (Note 1), Æ = 180¡ 20 25 mA 5.40 5.85 V External Voltage Ref. 4.98 Note 1: Vsine measured Vsine to VZ. VCOS measured VCOS to VZ. All other voltages specified are measured to ground. Note 2: Max PWR dissipation ²VCC X ICC - (V2 Isine + V12 ICOS). Package Pin Description PACKAGE PIN # 20L SO (internally fused leads) PIN SYMBOL FUNCTION 14L PDIP 1 1 VZ External Zener reference. 2 2 Vsine Sine output signal. 3 4 VBIAS Test pin or "0" calibration pin. 4, 5, 6, 7, 14, 15, 16, 17 7 Gnd Analog Ground connection. 8 5 CPÐ Negative input to charge pump. 9 6 CP+ Positive input to charge pump. 10 3 NC No Connection 11 8 F/VOUT Output voltage proportional to input signal frequency. 2 CS289 Package Pin Description: continued PACKAGE PIN # PIN SYMBOL FUNCTION 20L SO 14L PDIP 12 9 SQOUT Buffered square wave output signal. 13 10 SQIN Speed or RPM input signal. 18 11 VREG Voltage regulator output. 19 12 VCOS Cosine output signal. 20 13 VCC Supply voltage. 14 Pwr Gnd Power Ground connection. Note 1: Vsine measured Vsine to VZ. VCOS measured VCOS to VZ. All other voltages specified are measured to ground. Note 2: Max PWR dissipation ²VCC X ICC - (V2 Isine + V12 ICOS). Typical Performance Characteristics Charge Pump Output Voltage Output Angle in Polar Form Relationship of EQ, Q and Frequency 7.1 + V COS Q P 6 OUTPUT F/V Output (V) COSINE Q VP SIN Q Ð + 5 4 3 SINE OUTPUT VZ 2.1 Ð F/VOUT = 2.0V + FREQ X CT X RT X VREG 0 45û 90û 135û 180û 225û Frequency/Output Angle (°) Function Generator Output Voltage 2.1 3.8 5.45 7.1 4.5 3.5 VSINE, VCOS (V) VSINE 2.5 4.5V VCOS 1.5 VZ -1.5 -2.5 4.5V -3.5 -4.5 0 45û 90û 135û 180û 225û Tachometer Angular Deflection (°) 3 270û 270û CS289 Circuit Description Function Generator/Sine and Cosine Amplifiers Charge Pump The output waveforms of the sine and cosine amplifiers are derived by On-Chip Amplifier/Comparator circuitry. The various trip points for the circuit (i.e. 90¡, 180¡, 270¡) are determined by an internal resistor divider connected to the voltage regulator. The voltage EÆ is compared to the divider network by the function generator circuitry. Use of an external zener reference at VZ allows both sine and cosine amplifiers to swing positive and negative with respect to this reference. The output magnitudes and directions have the relationship as shown in Typical Characteristics diagrams. The input frequency is buffered through a transistor, then applied to the charge pump for frequency-to-voltage conversion (Figure 1). The charge pump output voltage, EÆ, will range from 2.1V with no input (Æ= 0¡) to 7.1V at Æ = 270¡. The charge that appears on CT is reflected to COUT through a Norton amplifier. The frequency applied at SQIN charges and discharges CT through R1 and R2. COUT reflects the charge as a voltage across resistor RT. Note: Pin connections referenced are for the 14L DIP. Function Generator Output (Æ): VCC=13.1V, TA=25¡C Æ=ArcTan V sine (Measured angle after calibration at 180¡C) V cos 1kW For ÆA=45¡, 90¡, 135¡, 180¡, 225¡, 270¡, (Desired angle) TACH INPUT 2kW 15 (ÆA-ÆM)²4.0¡ B+ 18V R2 2kW Temperature Sensitivity: VCC=13.1V EQ Voltage Sensitivity: TA=25¡C F-VOUT SQOUT SQIN VREG VCOS (ÆÆMT)²3.5¡C, -20¡C²T²+85¡C VCC Gnd ÆÆMT=ÆM (T=25¡C) -ÆM (-20¡C²T²+85¡C) COUT 1mF ±10% CS289 ÆÆMV=ÆM (VCC=13.1V) -ÆM (11.3V²VCC²15V) RT 180kW * Gnd CP+ CPÐ VBIAS NC VZ 100W VSINE B+ (ÆÆMV)²2¡, 11.3V²VCC²15V 80mH 225 ZENER 5.4V SINE 80mH 225 R1 CT 1kW 0.01mF * ADJUST FOR TRIMMING Figure 1. Functional Diagram of CS289 Circuit. 4 Typical values shown above apply to a nominal value of VREG of 8.5 volts. It must be realized that trimming of RT will be necessary to compensate for variations in regulator voltage from one unit to another. RPM x # OF CYL. = Frequency 60 2 VF/VOUT = 2.1 + Frequency x CT x RT (VREG -0 .7) The above equations were used in calculating the following values, where VF/VOUT = 7.1V at =270¡ and CT = 0.01 F. An alternative to this adjustment is to replace R2 with a potentiometer, as shown in Figure 2. 4 cylinder: Freq = 200Hz, RT = 320k½ 6 cylinder: Freq = 300Hz, RT = 220k½ 8 cylinder: Freq = 400Hz, RT = 150k½ F-VOUT Gnd CP+ CPÐ CP CP Gnd CP+ IOUT/EQ F-VOUT SQOUT SQIN TRIM RT RT CPÐ VREG VBIAS NC VCOS 10kW Partial schematic shown in Figure 3 represents one method for use with DC applications instead of frequency. 2.1V 0.7V CT IIN 1kW Figure 2: Alternate Trimming Method Figure 3: DC Application 5 CS289 Tachometer Application CS289 Package Specification PACKAGE THERMAL DATA PACKAGE DIMENSIONS IN mm (INCHES) Lead Count 14L PDIP 20L SO Wide (internally fused leads) Metric Max Min 19.69 18.67 13.00 12.60 D Thermal Data English Max Min .775 .735 .512 .496 RQJC RQJA typ typ 14L 20L SOIC PDIP Wide (internally fused leads) 48 17 ¡C/W 85 90 ¡C/W Plastic DIP (N); 300 mil wide 7.11 (.280) 6.10 (.240) 8.26 (.325) 7.62 (.300) 1.77 (.070) 1.14 (.045) 2.54 (.100) BSC 3.68 (.145) 2.92 (.115) .356 (.014) .203 (.008) 0.39 (.015) MIN. .558 (.022) .356 (.014) REF: JEDEC MS-001 D Some 8 and 16 lead packages may have 1/2 lead at the end of the package. All specs are the same. Surface Mount Wide Body (DW); 300 mil wide 7.60 (.299) 7.40 (.291) 10.65 (.419) 10.00 (.394) 0.51 (.020) 0.33 (.013) 1.27 (.050) BSC 2.49 (.098) 2.24 (.088) 1.27 (.050) 0.40 (.016) 2.65 (.104) 2.35 (.093) 0.32 (.013) 0.23 (.009) D REF: JEDEC MS-013 0.30 (.012) 0.10 (.004) Ordering Information Part Number Description CS289GDWF20 20 Lead SO Wide (internally fused leads) CS289GDWFR20 20 Lead SO Wide (internally fused leads) (tape & reel) CS289GN14 14 Lead PDIP Rev. 3/8/99 Cherry Semiconductor Corporation reserves the right to make changes to the specifications without notice. Please contact Cherry Semiconductor Corporation for the latest available information. 6 © 1999 Cherry Semiconductor Corporation