MAX6691 Four-Channel Thermistor Temperature-to-Pulse-Width Converter

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 10A (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 MAX package and is specified from -55C to +125C temperature range.
By Maxim Integrated Products
MAX6691 's PackagesMAX6691 's pdf datasheet
MAX6691MUBT uMAX
MAX6691MUB uMAX
MAX6691MUB-T uMAX




MAX6691 Pinout, Pinouts
MAX6691 pinout,Pin out
This is one package pinout of MAX6691,If you need more pinouts please download MAX6691's pdf datasheet.

MAX6691 Application circuits
MAX6691 circuits
This is one application circuit of MAX6691,If you need more circuits,please download MAX6691's pdf datasheet.


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