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LTC6801 Datasheet(PDF) 20 Page - Analog Devices |
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LTC6801 Datasheet(HTML) 20 Page - Analog Devices |
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20 / 28 page  LTC6801 20 Rev. F For more information www.analog.com 2.2k 10k NTC B = 3380 10k NTC B = 3380 2.2k 0.5µF V+ C12 C11 C10 C9 C8 C7 C6 C5 C4 C3 C2 C1 V– VTEMP1 VTEMP2 VREF VREG OV1 OV0 UV1 UV0 HYST CC1 CC0 SLT SLTOK DC EOUT EOUT SIN SIN SOUT SOUT EIN EIN LTC6801 6801 F10 0.5µF LT6003 APPLICATIONS INFORMATION is complete, and the SLTOK status will be valid when the self test completes. The worst case delay before SLTOK is valid in continuous monitor mode is approximately 15ms for the current cycle to complete plus 17ms for the self test to complete. The 6802-1 can measure the LTC6801 reference, which will independently test the analog circuitry of the LTC6802. CELL-VOLTAGE FILTERING The LTC6801 employs a sampling system to perform its analog-to-digital conversions and provides a conversion result that is essentially an average over the 0.5ms con- version window. If there is significant noise at frequen- cies near 500kHz there may be aliasing in the delta-sigma modulator. A lowpass filter with 30dB attenuation at 500kHz may be beneficial. Since the delta-sigma integra- tion bandwidth is about 1kHz, the filter corner need not be lower than this to assure accurate conversions. Figure 10. Buffering VREF for Higher-Current Sensors. Two Independent Probes With a +70°C Trip Point Figure 9. Driving Thermistors Directly from VREF. Two Independent Probes With a +60°C Trip Point 100k 500k NTC B = 4567 500k NTC B = 4567 100k 1µF V+ C12 C11 C10 C9 C8 C7 C6 C5 C4 C3 C2 C1 V– VTEMP1 VTEMP2 VREF VREG OV1 OV0 UV1 UV0 HYST CC1 CC0 SLT SLTOK DC EOUT EOUT SIN SIN SOUT SOUT EIN EIN LTC6801 6801 F09 1µF Figure 8. Adding RC Filtering to the Cell inputs 6801 F08 V– C1 C2 C3 1k 10nF 1k 10nF 1k 10nF Series resistors of 1k may be inserted in the input paths without introducing measurement error. Shunt capacitors may be added from the cell inputs to V–, creating RC filter- ing as shown in Figure 8. The combination of 1k and 10nF is recommended as a robust, cost effective noise filter. |
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