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ADBMS1818ASWZ-R7 bảng dữ liệu(PDF) 85 Page - Analog Devices

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ADBMS1818ASWZ-R7 bảng dữ liệu(HTML) 85 Page - Analog Devices

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Data Sheet
ADBMS1818
APPLICATIONS INFORMATION
analog.com
Rev. 0 | 85 of 89
READING EXTERNAL TEMPERATURE
PROBES
Figure 110 shows the typical biasing circuit for a negative tempera-
ture coefficient (NTC) thermistor. The 10 kΩ at 25°C is the most
popular sensor value and the VREF2 output stage is designed to
provide the current required to bias several of these probes. The
biasing resistor is selected to correspond to the NTC value so the
circuit provides 1.5 V at 25°C (VREF2 is 3 V nominal). The overall
circuit response is approximately –1%/°C in the range of typical cell
temperatures, as shown in the chart of Figure 110.
Expanding the Number of Auxiliary
Measurements
The ADBMS1818 has nine GPIO pins that can be used as ADC
inputs. In applications that need to measure more than nine signals,
a mux circuit can be implemented to expand the analog measure-
ments to 16 different signals (Figure 111). The GPIO1 ADC input
is used for measurement and mux control is provided by the I2C
port on GPIO4 and GPIO5. The buffer amplifier is selected for fast
settling and increases the usable throughput rate.
Figure 110. Typical Temperature Probe Circuit and Relative Output
Figure 111. Mux Circuit Supports 16 Additional Analog Measurements



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