Datasheet MAX30208 (Maxim) - 7
| Hersteller | Maxim |
| Beschreibung | ±0.1°C Accurate, I2C Digital Temperature Sensor |
| Seiten / Seite | 29 / 7 — Functional Diagram. MAX30208. MCU. Detailed Description. Operation. … |
| Dateiformat / Größe | PDF / 741 Kb |
| Dokumentensprache | Englisch |
Functional Diagram. MAX30208. MCU. Detailed Description. Operation. Measurement Considerations
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MAX30208 ±0.1°C Accurate, I2C Digital Temperature Sensor
Functional Diagram
1.7V to 3.6V
MAX30208
RSDA RSCL VDD 4.7kΩ 4.7kΩ GPIO1 SDA SDA CONTROL LOGIC GPIO0 I2C INTERFACE SCL
MCU
SCL VDD REGISTERS GND GND TEMP CVDD SENSOR 0.1µF
Detailed Description Operation
The MAX30208 temperature sensor measures tem-
Measurement Considerations
perature with ±0.1°C accuracy over a +30°C to +50°C Key parameters affecting the performance of tempera- temperature range and ±0.15°C accuracy over a 0°C ture sensors are the thermal conductivity from the IC to to +70°C temperature range. The device communicates the board and from the IC to the air. A conventional sur- over a standard I2C interface with serial data (SDA) and face-mount temperature sensor IC has high thermal con- serial clock (SCL) lines to read the FIFO, which contains ductivity to the circuit board on which it is mounted. Heat up to 32, 2-byte temperature readings. The device oper- travels from the board through the package leads to the ates properly over a -40°C to +85°C temperature range sensor die. Although air temperature also affects die tem- without any damage. perature, the sensor plastic package does not conduct In addition to the FIFO, the memory mapped registers heat as well as its leads. Therefore, board temperature contain high-alarm and low-alarm trigger registers and a has a greater influence on the measured temperature. temperature sensor setup register. The temperature sen- ● Place the sensor as close as possible to the target sor provides a 16-bit ADC. The Alarm High, Alarm Low, temperature to be measured and create a good ther- and Setup registers are volatile, and do not retain data mal contact with the top of the package. when the device is powered down. ● Use traces that are as thin as possible to minimize The MAX30208 has two GPIO pins. The default state of the thermal conduction away from the sensor. the GPIO pins at powerup determines the 2 LSBs in the I2C address of the device. GPIO1 allows for an optional ● Best results are obtained when the device is mount- external convert temperature trigger while GPIO0 can be ed on a flexible kapton PCB. configured as an interrupt for selectable status bits. www.maximintegrated.com Maxim Integrated │ 7
Functional Diagram
1.7V to 3.6V
MAX30208
RSDA RSCL VDD 4.7kΩ 4.7kΩ GPIO1 SDA SDA CONTROL LOGIC GPIO0 I2C INTERFACE SCL
MCU
SCL VDD REGISTERS GND GND TEMP CVDD SENSOR 0.1µF
Detailed Description Operation
The MAX30208 temperature sensor measures tem-
Measurement Considerations
perature with ±0.1°C accuracy over a +30°C to +50°C Key parameters affecting the performance of tempera- temperature range and ±0.15°C accuracy over a 0°C ture sensors are the thermal conductivity from the IC to to +70°C temperature range. The device communicates the board and from the IC to the air. A conventional sur- over a standard I2C interface with serial data (SDA) and face-mount temperature sensor IC has high thermal con- serial clock (SCL) lines to read the FIFO, which contains ductivity to the circuit board on which it is mounted. Heat up to 32, 2-byte temperature readings. The device oper- travels from the board through the package leads to the ates properly over a -40°C to +85°C temperature range sensor die. Although air temperature also affects die tem- without any damage. perature, the sensor plastic package does not conduct In addition to the FIFO, the memory mapped registers heat as well as its leads. Therefore, board temperature contain high-alarm and low-alarm trigger registers and a has a greater influence on the measured temperature. temperature sensor setup register. The temperature sen- ● Place the sensor as close as possible to the target sor provides a 16-bit ADC. The Alarm High, Alarm Low, temperature to be measured and create a good ther- and Setup registers are volatile, and do not retain data mal contact with the top of the package. when the device is powered down. ● Use traces that are as thin as possible to minimize The MAX30208 has two GPIO pins. The default state of the thermal conduction away from the sensor. the GPIO pins at powerup determines the 2 LSBs in the I2C address of the device. GPIO1 allows for an optional ● Best results are obtained when the device is mount- external convert temperature trigger while GPIO0 can be ed on a flexible kapton PCB. configured as an interrupt for selectable status bits. www.maximintegrated.com Maxim Integrated │ 7