MAX6691
PRODUCTIONFour-Channel Thermistor Temperature-to-Pulse-Width Converter
- Part Models
- 2
- 1ku List Price
- Starting From $5.38
Part Details
- Simple Single-Wire Interface
- Measures Up to Four Thermistor Temperatures
- Low-Average Thermistor Current Minimizes Self-Heating Errors
- Internal Voltage Reference Isolates Thermistor from Power-Supply Noise
- Accommodates Any Thermistor Temperature Range
The MAX6691 four-channel thermistor temperature-to-pulse-width converter measures the temperatures of up to four thermistors and converts them to a series of output pulses whose widths are related to the thermistors' temperatures. Each of the four thermistors and an external fixed resistor (REXT) form a voltage-divider that is driven by the MAX6691's internal voltage reference (VREF). VREF and the voltage across REXT are measured and converted to a pulse.
The MAX6691 has a single open-drain I/O pin that can be readily connected to a variety of microcontrollers. The microcontroller initiates a conversion by pulling the I/O pin low and releasing it. When conversion is done, the MAX6691 signals the end of conversion by pulling the I/O pin low once again. The pulse corresponding to the first thermistor is sent immediately after the release of the I/O pin.
The on-chip power-management circuitry reduces the average thermistor current to minimize errors due to thermistor self-heating. Between conversions, the MAX6691 falls into a 10µA (max) sleep mode, where the voltage reference is disabled and the supply current is at its minimum.
The MAX6691 is available in a 10-pin µMAX package and is specified from -55°C to +125°C temperature range.
Applications
- Home Appliances
- HVAC
- Medical Devices
Documentation
Data Sheet 1
Design Note 1
Technical Articles 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| MAX6691MUB+ | 10-MINI_SO-N/A | ||
| MAX6691MUB+T | 10-MINI_SO-N/A |
This is the most up-to-date revision of the Data Sheet.
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