Standard Products Datasheet PCS5038 Octal Precision Current Source Radiation Tolerant www.aeroflex.com/pcs April 2, 2015 FEATURES Radiation Performance - Total dose > 100 krad (Si), Dose rate = 50 - 300 rads(Si)/s Designed for temperature monitoring with Thermistors and RTDs (Resistance Temperature Detectors) Eight high precision current sources - One external resistor to set source current - Source current range from 100uA to 2mA - Accuracy to less than ± 1% over full operating range - Sensor voltage monitoring comparator on each precision current source output - Turn all eight sources ON/OFF with ENA_PCS_H input pin - Long term stability - Low Drift Internal Band Gap regulator - High Precision 2.0V output - Provided for use to generate VREF comparator inputs Eight voltage monitoring comparators - High impedance sensor interface - Two groups of 4 comparators with separate VREF and Enable input pins - Provided for built-in monitoring of the voltage generated by the current sources - Can be used as an octal comparator by turning off all current sources with ENA_PCS_H set to logic 0 Zener protected inputs Single +5V supply voltage Low supply current Designed for aerospace and high reliability space applications Packaging - Hermetic ceramic - 40 leads, 0.600"Sq x 0.120"Ht quad flat pack - Weight: 4.5 gm max Aeroflex Plainview’s Radiation Hardness Assurance Plan is DLA Certified to MIL-PRF-38534, Appendix G. GENERAL DESCRIPTION The Aeroflex Plainview PCS5038 contains eight precision current sources that can be set with a single external resistor connected to the R_Iset pin. The current source was designed for thermistor current monitor and resistive sensor applications. The precision current source outputs can be set to source from 100uA to 2mA each. Two-to-eight of the current source outputs can be paralleled to produce multiple current source outputs levels. The output current of each current source will follow the current set by the external resistor and the precision voltage at the R_Iset pin. The output current precision is a function of the voltage at the R_Iset pin and the chosen resistor’s characteristics. The comparator inputs will monitor the current source output voltage, with a trip point set by an external reference voltage or the internal reference voltage. A precision internal 2.0V reference is provided. The comparators are arranged as two banks of four with separate Enable and voltage reference inputs. A Current Source Enable is also provided. See Figure 1. All Enable inputs are active high. All comparators are inverting with their outputs pulled-up internally by a nominal 10k ohm resistor. Any unused current source outputs can be left open circuit without affecting other I/O’s. Each current source output will track the other seven current source outputs as long as the voltage generated by the resistor sensor does not exceed 2.0V below the supply voltage (VCC-2.0V). Higher sensor voltages can be accommodated by increasing the supply voltage. SCD5038 Rev C FIGURE 1 – Block Diagram SCD5038 Rev C 4/2/15 2 Aeroflex Plainview ABSOLUTE MAXIMUM RATINGS Parameter Rating Operating Case Temperature -55°C to +125°C Storage Case Temperature -65°C to +150°C Power Supply Voltages (VCC) +7.0 VDC NOTICE: Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress rating only; functional operation beyond the "Operation Conditions" is not recommended and extended exposure beyond the "Operation Conditions" may affect device reliability. ELECTRICAL CHARACTERISTICS (VCC = +5.0VDC ±5%, TC = -55°C TO +125°C, Unless otherwise specified) Parameter Precision Current Source Out 100ua < IPCS < 2ma External Set Resistor Tolerance = +/- 0.1% TC < +/- 10ppm Symbol 1/ 1/ Current Source Matching Accuracy Comparator In Voltage 2/ Condition Min Max Unit IPCSON ENA_PCS_H = Hi ENA_GRP1_H = Hi ENA_GRP2_H = Hi IPCS -0.75% IPCS +0.75% mA IPCSOFF ENA_PCS_H = Lo ENA_GRP1_H = Hi ENA_GRP2_H = Hi - 1000 nA IMATCH Relative to Mean of IPCSON(1:8) @ 25°C -0.75 0.75 % VIN Input or Reference 0 3.0 V Comparator Ref In Current IREF VREF_GRP1 = 0V VREF_GRP2 = 0V - 2.0 uA Enable Input Voltage Low ENA_PCS_H (pin 33) ENA_GRP1_H (pin 32) ENA_GRP2_H (pin 31) VIL - 0.8 V Enable Input Voltage High ENA_PCS_H (pin 33) ENA_GRP1_H (pin 32) ENA_GRP2_H (pin 31) VIH 2.0 - V Output Voltage Low CMPout (1:8) (pins 1-4 and 12-15) VOL - 0.5 V Output Voltage High CMPout (1:8) (pins 1-4 and 12-15) VOH 4.4 RINT 8 Internal Output Pull-Up Resistor 2/ Input Open Circuit Voltage VINOC R_Iset pin Voltage VSET R_Iset Temp Coefficient VBG Band Gap Load Regulation BGR_VREF (pin 26) 2/ Comparator Pulse Delay 3/ Comparator Enablet Delay 3/ VBG IBG tDLH1 tDHL1 tDLH2 tDHL2 V 12 K VCC V 1.990 2.010 V -0.75 0.75 % @ 25°C 1.990 2.010 @ -55°C, +125°C 1.980 2.020 BG Iout < 2mA - 5 mV CL = 30pF, Vref = 1.0Vdc Vin overdrive > 50mV See Figure 2 - 300 nS - 200 nS - 1000 nS - 750 nS @ 25°C VSET-TC Band Gap Output Voltage BGR_VREF (pin 26) SCD5038 Rev C 4/2/15 Isink < 2.0mA CL = 30pF, Vref = 1.0Vdc Vin = 1.05vdc See Figure 2 3 V Aeroflex Plainview ELECTRICAL CHARACTERISTICS (VCC = +5.0VDC ±5%, TC = -55°C TO +125°C, Unless otherwise specified) Parameter Symbol IPCS Enable Delay 3/ Short Circuit Current 2/ Output Current Noise @ 1KHz See Curve 2/ Supply current PCS and Comparator Groups Disabled 1/ PCS and Comparator Groups Enabled 1/ tDLH3 tDHL3 Condition CL = 30pF, Vref = 1.0Vdc Rin = 1K, R_Iset = 1K IPCS= 2mA, See Figure 2 Min Max Unit - 3.0 uS - 500 nS 60 mA ISC R_Iset = 0, PCS and Comparator Groups Enabled @ 25°C Inoise 1 IPCS = 100uA @ 25°C, Typ = 11.5 - - Inoise 2 IPCS = - - pA/ Hz - 10 mA 30 mA 2mA @ 25°C, Typ = 63.0 ICCq ENA_PCS_H = Lo ENA_GRP1_H = Lo ENA_GRP2_H = Lo ICC R_Iset IPCS ENA_PCS ENA_GRP1_H ENA_GRP2_H CMPout(1:8) = 1K = 2mA = Hi = Hi = Hi = Hi Notes: 1/ Hi > VIH, LO < VIL. 2/ Guaranteed by design, but not tested. 3/ Test fixture node capacitance plus 10pF scope capacitance. FIGURE 2 – Timing Diagram SCD5038 Rev C 4/2/15 4 Aeroflex Plainview One primary application for the Aeroflex PCS5038, as shown in Figure 3 below, would be to monitor the temperature of different electronic bay areas in a Satellite, and report when any bay area has exceeded a maximum temperature limit. Thermistors with defined temperature characteristics are used as the sensors, and by providing a constant stable current to the external Thermistor (Temp T1 to Temp T8), an accurate analog voltage of a specific temperature trip point can be established. The comparator voltage reference input can be tailored to set the trip point for the characteristic of the particular thermistor sensor used. The on-board precision 2 Volt reference can be used directly for voltages of 2 Volts or less, or can be scaled with an external operational amplifier to provide a voltage between 2 Volts and the maximum input of 3.0 Volts, for a +5v supply. Various temperature trip points could be accomplished by using thermistors with different temperature characteristics. FIGURE 3 – Typical Temperature Sensing Application SCD5038 Rev C 4/2/15 5 Aeroflex Plainview When more "Temperature Sensing" inputs are needed, two PCS5038s can be used as shown below in Figure 4. The output of the two PCS5038s can be wired together to produce a wired "OR" function. Each bank of 8 inputs can then be separately controlled by its associated Enable input. One application of the multiple input arrangement would be circuit board temperature monitoring using the temperature characteristics of a PN (diode) junction. With a constant current to the diode sensor, the diode voltage can be a calibrated function of temperature. Diodes can be placed on or near vital electronic components to monitor their case temperatures so that they can be shutdown before a catastrophic temperature failure occurs. FIGURE 4 – 16 Input, 8 Output Wired "OR" Application SCD5038 Rev C 4/2/15 6 Aeroflex Plainview FIGURE 5 – Typical Connection SCD5038 Rev C 4/2/15 7 Aeroflex Plainview FIGURE 6 – Package Outline SCD5038 Rev C 4/2/15 8 Aeroflex Plainview PIN DESCRIPTIONS Signal Name PCS(1:8) Pin# Type Description PCS(1) PCS(2) PCS(3) PCS(4) PCS(5) PCS(6) PCS(7) PCS(8) 39 38 37 36 10 9 8 7 I/O I/O I/O I/O I/O I/O I/O I/O ENA_GRP1_H 32 Input Logic 1 state on ENA_GRP1_H enables CMPout(1:4). ENA_GRP2_H 31 Input Logic 1 state on ENA_GRP2_H enables CMPout(5:8). ENA_PCS_H 33 Input Logic 1 state input on the ENA_PCS_H enables all eight precision current sources. Eight Precision Current Sources. Output currents are settable from 100uA to 2.0mA with one external resistor connected between R_Iset pin (25) and R_Iset_RTN pin (29). Each precision current source has a voltage monitoring comparator that will trigger the associated CMPout(1:8) when the sensor voltage increases to greater than VREF_GRP1 for CMPout(1:4) and VREF_GRP2 for CMPout(5:8). Logic 0 state input on the ENA_PCS_H places PCS(1:8) in high impedance state. The sensor voltage monitoring comparators all remain functional. VREF_GRP1 40 Input External Voltage Reference comparators for PCS(1:4). Input to sensor monitoring VREF_GRP2 11 Input External Voltage Reference comparators for PCS(5:8). Input to sensor monitoring R_Iset 25 Input Connect to the External Resistor to set the current level for PCS(1:8). R_Iset_RTN 29 Input Return for the External Resistor. Must be grounded close to pin. CMPout(1) CMPout(2) CMPout(3) CMPout(4) CMPout(5) CMPout(6) CMPout(7) CMPout(8) 1 2 3 4 12 13 14 15 Output Output Output Output Output Output Output Output Sensor voltage monitoring comparator output for each precision current source PCS(1:8). BGR_VREF 26 Output Band Gap Regulator. Precision Output 2.0VDC. VCC(1:4) VCC(1) VCC(2) VCC(3) VCC(4) 5 16 23 35 Power Power Power Power +5 Volt power supply connections. GND(1:5) GND(1) GND(2) GND(3) GND(4) GND(5) 6 17 18 24 34 Power Power Power Power Power Power supply return connections CASE_GND(1:7) CASE_GND(1) CASE_GND(2) CASE_GND(3) CASE_GND(4) CASE_GND(5) CASE_GND(6) CASE_GND(7) 19 20 21 22 27 28 30 Case Case Case Case Case Case Case All case CASE_GND pins shall be connected together and grounded. The CASE_GND pins are connected to the cover to prevent static charge build-up. CMPOUT(1:8) SCD5038 Rev C 4/2/15 The CMPout(1:8) outputs are active low and trigger to a logic 0 state when sensor voltage on the respective PCS(1:8) pin increases to greater than the associated VREF comparator input voltage. 9 Aeroflex Plainview ORDERING INFORMATION MODEL DLA SMD # SCREENING PACKAGE PCS5038-7 - Commercial Flow, +25°C testing only PCS5038-S - Military Temperature, -55°C to +125°C Screened in accordance with the individual Test Methods of MIL-STD-883 for Space Applications PCS5038-201-1S 5962-1223201KXC In accordance with DLA SMD PCS5038-901-1S 5962R1223201KXC In accordance with DLA Certified RHA Program Plan to RHA Level "R", 100 krad(Si) 40-lead Ceramic Quad Flat Pack EXPORT CONTROL: This product is controlled for export under the U.S. Department of Commerce (DoC). A license may be required prior to the export of this product from the United States. www.aeroflex.com/HiRel [email protected] Datasheet Definitions: Advanced Preliminary Datasheet Product in Development Shipping Non-Flight Prototypes Shipping QML and Reduced HiRel Aeroflex Plainview, Inc. reserves the right to make changes to any products and services described herein at any time without notice. Consult Aeroflex or an authorized sales representative to verify that the information in this data sheet is current before using this product. Aeroflex does not assume any responsibility or liability arising out of the application or use of any product or service described herein, except as expressly agreed to in writing by Aeroflex; nor does the purchase, lease, or use of a product or service from Aeroflex convey a license under any patent rights, copyrights, trademark rights, or any other of the intellectual rights of Aeroflex or of third parties. SCD5038 Rev C 4/2/15 10 Our passion for performance is defined by three attributes. Solution-Minded Performance-Driven Customer-Focused