LM19CIZ/NOPB

LM19 www.ti.com SNIS122E – MAY 2001 – REVISED MARCH 2013 LM19 2.4V, 10µA, TO-92 Temperature Sensor Check for Samples: LM19 FEATURES 1 • • • • • 2 Rated for Full −55°C to +130°C Range Available in a TO-92 Package Predictable Curvature Error Suitable for Remote Applications UL Recognized Component APPLICATIONS • • • • • • • • • Cellular Phones Computers Power Supply Modules Battery Management FAX Machines Printers HVAC Disk Drives Appliances KEY SPECIFICATIONS • • • • • • • Accuracy at +30°C ±2.5 °C (max) Accuracy at +130°C & −55°C ±3.5 to ±3.8 °C (max) Power Supply Voltage Range +2.4V to +5.5V Current Drain 10 μA (max) Nonlinearity ±0.4 % (typ) Output Impedance 160 Ω (max) Load Regulation – 0µA < IL< +16 µA DESCRIPTION The LM19 is a precision analog output CMOS integrated-circuit temperature sensor that operates over a −55°C to +130°C temperature range. The power supply operating range is +2.4 V to +5.5 V. The transfer function of LM19 is predominately linear, yet has a slight predictable parabolic curvature. The accuracy of the LM19 when specified to a parabolic transfer function is ±2.5°C at an ambient temperature of +30°C. The temperature error increases linearly and reaches a maximum of ±3.8°C at the temperature range extremes. The temperature range is affected by the power supply voltage. At a power supply voltage of 2.7 V to 5.5 V the temperature range extremes are +130°C and −55°C. Decreasing the power supply voltage to 2.4 V changes the negative extreme to −30°C, while the positive remains at +130°C. The LM19's quiescent current is less than 10 μA. Therefore, self-heating is less than 0.02°C in still air. Shutdown capability for the LM19 is intrinsic because its inherent low power consumption allows it to be powered directly from the output of many logic gates or does not necessitate shutdown at all. 1 2 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2001–2013, Texas Instruments Incorporated LM19 SNIS122E – MAY 2001 – REVISED MARCH 2013 www.ti.com Typical Application Output Voltage vs Temperature VO = (−3.88×10−6×T2) + (−1.15×10−2×T) + 1.8639 or where: T is temperature, and VO is the measured output voltage of the LM19. Figure 1. Full-Range Celsius (Centigrade) Temperature Sensor (−55°C to +130°C) Operating from a Single Li-Ion Battery Cell Temperature (T) Typical VO +130°C +303 mV +100°C +675 mV +80°C +919 mV +30°C +1515 mV +25°C +1574 mV 0°C +1863.9 mV −30°C +2205 mV −40°C +2318 mV −55°C +2485 mV Connection Diagram Figure 2. TO-92 Package Number LP These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. 2 Submit Documentation Feedback Copyright © 2001–2013, Texas Instruments Incorporated Product Folder Links: LM19 LM19 www.ti.com SNIS122E – MAY 2001 – REVISED MARCH 2013 Absolute Maximum Ratings (1) Supply Voltage +6.5V to −0.2V Output Voltage (V+ + 0.6 V) to −0.6 V Output Current 10 mA Input Current at any pin (2) 5 mA −65°C to +150°C Storage Temperature Maximum Junction Temperature (TJMAX) +150°C ESD Susceptibility (3) 2500 V Human Body Model Machine Model Lead Temperature (1) (2) (3) TO-92 Package 250 V Soldering (3 seconds dwell) +240°C Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not ensure specific performance limits. For ensured specifications and test conditions, see the Electrical Characteristics. The specified specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions. When the input voltage (VI) at any pin exceeds power supplies (VI < GND or VI > V+), the current at that pin should be limited to 5 mA. The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. The machine model is a 200 pF capacitor discharged directly into each pin. Operating Ratings (1) TMIN ≤ TA ≤ TMAX Specified Temperature Range 2.4 V ≤ V+≤ 2.7 V −30°C ≤ TA ≤ +130°C 2.7 V ≤ V+≤ 5.5 V −55°C ≤ TA ≤ +130°C + Supply Voltage Range (V ) Thermal Resistance, θJA (2) (1) (2) +2.4 V to +5.5 V TO-92 150°C/W Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not ensure specific performance limits. For ensured specifications and test conditions, see the Electrical Characteristics. The specified specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions. The junction to ambient thermal resistance (θJA) is specified without a heat sink in still air. Submit Documentation Feedback Copyright © 2001–2013, Texas Instruments Incorporated Product Folder Links: LM19 3 LM19 SNIS122E – MAY 2001 – REVISED MARCH 2013 www.ti.com Electrical Characteristics Unless otherwise noted, these specifications apply for V+ = +2.7 VDC. Boldface limits apply for TA = TJ = TMIN to TMAX ; all other limits TA = TJ = 25°C; Unless otherwise noted. Parameter Conditions Typical (1) LM19C Limits (2) Temperature to Voltage Error VO = (−3.88×10−6×T2) + (−1.15×10−2×T) + 1.8639V (3) Units (Limit) TA = +25°C to +30°C ±2.5 °C (max) TA = +130°C ±3.5 °C (max) TA = +125°C ±3.5 °C (max) TA = +100°C ±3.2 °C (max) TA = +85°C ±3.1 °C (max) TA = +80°C ±3.0 °C (max) TA = 0°C ±2.9 °C (max) TA = −30°C ±3.3 °C (min) TA = −40°C ±3.5 °C (max) TA = −55°C ±3.8 °C (max) Output Voltage at 0°C +1.8639 V Variance from Curve ±1.0 °C Non-Linearity (4) −20°C ≤ TA ≤ +80°C ±0.4 Sensor Gain (Temperature Sensitivity or Average Slope) to equation: VO=−11.77 mV/°C×T+1.860V −30°C ≤ TA ≤ +100°C −11.77 Output Impedance (7) Load Regulation Line Regulation (8) mV/°C (min) mV/°C (max) 0 μA ≤ IL ≤ +16 μA (5) (6) 160 Ω (max) (5) (6) −2.5 mV (max) +3.7 mV/V (max) +11 mV (max) 7 μA (max) 0 μA ≤ IL ≤ +16 μA +2. 4 V ≤ V+ ≤ +5.0V +5.0 V ≤ V+ ≤ +5.5 V Quiescent Current Change of Quiescent Current +2. 4 V ≤ V+ ≤ +5.0V 4.5 + +5.0V ≤ V ≤ +5.5V 4.5 9 μA (max) +2. 4 V ≤ V+ ≤ +5.0V 4.5 10 μA (max) +2. 4 V ≤ V+ ≤ +5.5V +0.7 μA −11 nA/°C 0.02 μA Temperature Coefficient of Quiescent Current Shutdown Current (1) (2) (3) (4) (5) (6) (7) (8) 4 % −11.0 −12.6 + V ≤ +0.8 V Typicals are at TJ = TA = 25°C and represent most likely parametric norm. Limits are ensured to AOQL (Average Outgoing Quality Level). Accuracy is defined as the error between the measured and calculated output voltage at the specified conditions of voltage, current, and temperature (expressed in°C). Non-Linearity is defined as the deviation of the calculated output-voltage-versus-temperature curve from the best-fit straight line, over the temperature range specified. Negative currents are flowing into the LM19. Positive currents are flowing out of the LM19. Using this convention the LM19 can at most sink −1 μA and source +16 μA. Load regulation or output impedance specifications apply over the supply voltage range of +2.4V to +5.5V. Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output due to heating effects can be computed by multiplying the internal dissipation by the thermal resistance. Line regulation is calculated by subtracting the output voltage at the highest supply input voltage from the output voltage at the lowest supply input voltage. Submit Documentation Feedback Copyright © 2001–2013, Texas Instruments Incorporated Product Folder Links: LM19 LM19 www.ti.com SNIS122E – MAY 2001 – REVISED MARCH 2013 Typical Performance Characteristics Temperature Error vs. Temperature Thermal Response in Still Air 5 MAX Limit 4 ERROR ( º C) 3 2 Typical 1 0 -1 -2 MIN Limit -3 -4 -5 -100 -50 0 50 100 150 TEMPERATURE (ºC) LM19 TRANSFER FUNCTION The LM19's transfer function can be described in different ways with varying levels of precision. A simple linear transfer function, with good accuracy near 25°C, is VO= −11.69 mV/°C × T + 1.8663 V (1) Over the full operating temperature range of −55°C to +130°C, best accuracy can be obtained by using the parabolic transfer function VO = (−3.88×10−6×T2) + (−1.15×10−2×T) + 1.8639 (2) solving for T: (3) A linear transfer function can be used over a limited temperature range by calculating a slope and offset that give best results over that range. A linear transfer function can be calculated from the parabolic transfer function of the LM19. The slope of the linear transfer function can be calculated using the following equation: m = −7.76 × 10−6× T − 0.0115 where • T is the middle of the temperature range of interest and m is in V/°C. (4) For example for the temperature range of Tmin = −30 to Tmax = +100°C: T = 35°C and m = −11.77 mV/°C The offset of the linear transfer function can be calculated using the following equation: b = (VOP(Tmax) + VOP(T) − m × (Tmax+T))/2 where • • VOP(Tmax) is the calculated output voltage at Tmax using the parabolic transfer function for VO. VOP(T) is the calculated output voltage at T using the parabolic transfer function for VO. (5) Using this procedure the best fit linear transfer function for many popular temperature ranges was calculated in Table 1. As shown in Table 1 the error that is introduced by the linear transfer function increases with wider temperature ranges. Submit Documentation Feedback Copyright © 2001–2013, Texas Instruments Incorporated Product Folder Links: LM19 5 LM19 SNIS122E – MAY 2001 – REVISED MARCH 2013 www.ti.com Table 1. First Order Equations Optimized For Different Temperature Ranges Temperature Range Linear Equation VO= Maximum Deviation of Linear Equation from Parabolic Equation (°C) +130 −11.79 mV/°C × T + 1.8528 V ±1.41 +110 −11.77 mV/°C × T + 1.8577 V ±0.93 −30 +100 −11.77 mV/°C × T + 1.8605 V ±0.70 -40 +85 −11.67 mV/°C × T + 1.8583 V ±0.65 −10 +65 −11.71 mV/°C × T + 1.8641 V ±0.23 +35 +45 −11.81 mV/°C × T + 1.8701 V ±0.004 +20 +30 −11.69 mV/°C × T + 1.8663 V ±0.004 Tmin (°C) Tmax (°C) −55 −40 Mounting The LM19 can be applied easily in the same way as other integrated-circuit temperature sensors. It can be glued or cemented to a surface. The temperature that the LM19 is sensing will be within about +0.02°C of the surface temperature to which the LM19's leads are attached. This presumes that the ambient air temperature is almost the same as the surface temperature; if the air temperature were much higher or lower than the surface temperature, the actual temperature measured would be at an intermediate temperature between the surface temperature and the air temperature. To ensure good thermal conductivity the backside of the LM19 die is directly attached to the GND pin. The tempertures of the lands and traces to the other leads of the LM19 will also affect the temperature that is being sensed. Alternatively, the LM19 can be mounted inside a sealed-end metal tube, and can then be dipped into a bath or screwed into a threaded hole in a tank. As with any IC, the LM19 and accompanying wiring and circuits must be kept insulated and dry, to avoid leakage and corrosion. This is especially true if the circuit may operate at cold temperatures where condensation can occur. Printed-circuit coatings and varnishes such as Humiseal and epoxy paints or dips are often used to ensure that moisture cannot corrode the LM19 or its connections. The thermal resistance junction to ambient (θJA) is the parameter used to calculate the rise of a device junction temperature due to its power dissipation. For the LM19 the equation used to calculate the rise in the die temperature is as follows: TJ = TA + θJA [(V+ IQ) + (V+ − VO) IL] where • IQ is the quiescent current and ILis the load current on the output. (6) Since the LM19's junction temperature is the actual temperature being measured care should be taken to minimize the load current that the LM19 is required to drive. Table 2 summarizes the rise in die temperature of the LM19 without any loading, and the thermal resistance for different conditions. Table 2. Temperature Rise of LM19 Due to Self-Heating and Thermal Resistance (θJA) TO-92 TO-92 no heat sink small heat fin θJA TJ − TA θJA TJ − TA (°C/W) (°C) (°C/W) (°C) Still air 150 TBD TBD TBD Moving air TBD TBD TBD TBD 6 Submit Documentation Feedback Copyright © 2001–2013, Texas Instruments Incorporated Product Folder Links: LM19 LM19 www.ti.com SNIS122E – MAY 2001 – REVISED MARCH 2013 Capacitive Loads The LM19 handles capacitive loading well. Without any precautions, the LM19 can drive any capacitive load less than 300 pF as shown in Figure 3. Over the specified temperature range the LM19 has a maximum output impedance of 160 Ω. In an extremely noisy environment it may be necessary to add some filtering to minimize noise pickup. It is recommended that 0.1 μF be added from V+ to GND to bypass the power supply voltage, as shown in Figure 4. In a noisy environment it may even be necessary to add a capacitor from the output to ground with a series resistor as shown in Figure 4. A 1 μF output capacitor with the 160 Ω maximum output impedance and a 200 Ω series resistor will form a 442 Hz lowpass filter. Since the thermal time constant of the LM19 is much slower, the overall response time of the LM19 will not be significantly affected. Figure 3. LM19 No Decoupling Required for Capacitive Loads Less than 300 pF Table 3. LM19 with Filter for Noisy Environment and Capacitive Loading greater than 300 pF R (Ω) C (µF) 200 1 470 0.1 680 0.01 1k 0.001 Either placement of resistor as shown above is just as effective. Figure 4. LM19 with Filter for Noisy Environment and Capacitive Loading greater than 300 pF Submit Documentation Feedback Copyright © 2001–2013, Texas Instruments Incorporated Product Folder Links: LM19 7 LM19 SNIS122E – MAY 2001 – REVISED MARCH 2013 www.ti.com Applications Circuits V+ VTEMP R3 VT1 R4 VT2 LM4040 V+ VT R1 4.1V U3 0.1 PF R2 (High = overtemp alarm) + U1 - VOUT VOUT LM7211 VT1 = (4.1)R2 R2 + R1||R3 VT2 = (4.1)R2||R3 R1 + R2||R3 LM19 VTemp U2 Figure 5. Centigrade Thermostat Figure 6. Conserving Power Dissipation with Shutdown Figure 7. Suggested Connection to a Sampling Analog to Digital Converter Input Stage Most CMOS ADCs found in ASICs have a sampled data comparator input structure that is notorious for causing grief to analog output devices such as the LM19 and many op amps. The cause of this grief is the requirement of instantaneous charge of the input sampling capacitor in the ADC. This requirement is easily accommodated by the addition of a capacitor. Since not all ADCs have identical input stages, the charge requirements will vary necessitating a different value of compensating capacitor. This ADC is shown as an example only. If a digital output temperature is required please refer to devices such as the LM74. 8 Submit Documentation Feedback Copyright © 2001–2013, Texas Instruments Incorporated Product Folder Links: LM19 LM19 www.ti.com SNIS122E – MAY 2001 – REVISED MARCH 2013 REVISION HISTORY Changes from Revision D (March 2013) to Revision E • Page Changed layout of National Data Sheet to TI format ............................................................................................................ 8 Submit Documentation Feedback Copyright © 2001–2013, Texas Instruments Incorporated Product Folder Links: LM19 9 PACKAGE OPTION ADDENDUM www.ti.com 10-Dec-2020 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan (2) Lead finish/ Ball material MSL Peak Temp Op Temp (°C) Device Marking (3) (4/5) (6) LM19CIZ/LFT4 ACTIVE TO-92 LP 3 2000 RoHS & Green SN N / A for Pkg Type LM19CIZ/NOPB ACTIVE TO-92 LP 3 1800 RoHS & Green SN N / A for Pkg Type LM19 CIZ -55 to 130 LM19 CIZ (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may reference these types of products as "Pb-Free". RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption. Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of