MAX6691MUB+

The MAX6691MUB+ is a four-channel thermistor temperature to pulse width converter in 10 pin µMAX package. It 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 4 thermistors & an external fixed resistor form a voltage-divider that is driven by the MAX6691’s internal voltage reference. VREF and 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 I/O pin low once again. The pulse corresponding to 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.

• Supply voltage range is 3V to 5.5V
• Operating temperature range from -55°C to +125°C
• Low average thermistor current minimizes self heating errors
• Internal voltage reference isolates thermistor from power-supply noise
• Accommodates any thermistor temperature range

Applications

Sensing & Instrumentation, Consumer Electronics, HVAC

Warnings

Market demand for this product has caused an extension in leadtimes. Delivery dates may fluctuate. Product exempt from discounts.

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party